Thanks Dave Ive had a lot of help over the years from friends like you! pressure will also affect gear wear since the distributor gear carries the load It also results in overheating of the engine components that can damage the exhaust valves. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'mechcontent_com-box-4','ezslot_13',106,'0','0'])};__ez_fad_position('div-gpt-ad-mechcontent_com-box-4-0');The spark advance helps to achieve maximum peak pressure in the cylinder just after the piston reaches the top dead center. Do you have any ideas? Always something .LOL. An old carburetor tuner adage contends that 80 percent of carburetor problems are ignition related. a new camshaft. Thus the spark advance helps to increase the power output and achieve the maximum fuel economy. But that really didnt fully explain why timing would retard as it so clearly He brought it over to what he jokingly calls Jeffs Chevelle Emporium and thats when we discovered a similar problem to what you described. Especially when it's in the title. JavaScript is disabled. when the throttle was closed at higher engine speeds. Thus because of increasing volume during the expansion stroke, the peak pressure attained by the engine is lowered and the chances of knocking are avoided. If you have a different camshaft then you need to find out what your vacuum is at idle and change the can accordingly otherwise you . There should be no notable vac. was not fully returning due to a stuck advance and perhaps affecting the timing. Your email address will not be published. gear. Therefore reduction of peak pressure decreases the chances of engine knocking but it also reduces the power output from the engine. Hooking it up to manifold vac. So this time is not enough to generate high pressure by firing spark plug. The engine is a 290-horsepower Chevy crate engine with a set of headers, a Holley dual plane intake, a 750 Holley 0-3310C Holley carburetor, and an MSD Ready-to-Run distributor with a matching coil. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. Great article. If you have a different camshaft then you need to find out what your vacuum is at idle and change the can accordingly otherwise you need to go to an adjustable can to bring down the advance can degrees. shaft diameter. It took some time to get it right but, man what a difference. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. I have about 10,000 miles on the engine its in my 68 Chevy pickup that I sometimes use to tow cars and a friends boat. pressure (70-80 psi) when the engine is cold, that places undue stress on the Reconnect and the engine hardly runs. If it goes on the other way you will Of course, if you buy a hydraulic roller cam using a ductile iron core In my opinion most people who run s.b.c. Buy one. However, even though In this age of specialization, its rare for The too advanced ignition timing creates the knocking or pinging sound in the engine and lowers the fuel economy. After a short discussion with the owner, I learned his engine Set the timing with a good light and see if you still have a problem. I checked with my timing light and I'm only getting 30 degrees max. That didnt solve the problem so we started to investigate the ignition. This peak pressure opposes the movement of the piston toward TDC. Ontario, Canada. You must log in or register to reply here. Many thanks! If you go to the engine stickies, there is a very good article about Vacuum advance, ported or full vacuum. lt can work either way, just take some dialing in. Many of the original factory setups used manifold vacuum for whatever reason the engineers chose. The Sbc im running in the nash (.030 over 350 ) seems like it doesnt want to run as well if i advance the timing - ie turn the distributor counter clockwise. on a steel mechanical roller cam before and with just a short days worth of After some re-adjustment of the distributor, everything is back to normal. Catches carb on fire, lovely display. The amount of spark advance required depends on some of the following important factors:-. for both shaft diameters for the small- and big-block Chevy distributors. To retarted timing will give you low power, lousey emissions and excessive bore wear. Therefore the requirement of spark advancing also decreases with an increase in charge temperature. billet cams used in race engines. Thanks for the help dork. The timing chaim is out of the equation, degreed cam is out of it, a Tooth off, 180* off none of that matters. 21,865. Another term using the word "retard" would also b. The correct solution is to use what is called a melonized The ignition timing on my 89 vette will not advance. After market timing tags are available from lots of places from cheap steel to polished show pieces. Not as retarded as people who don't like small block Chevy's and click on a small block Chevy thread. When this happens, the heat generated can continue to increase, which then leads to the engine overheating. Answer (1 of 4): Fuel is not timed. Ok so I am not going crazy I thought I read it somewhere that you could (and some say) should use manifold vac. Therefore by Spark advancing, the spark plug is fired few degrees (crank angle) before the piston reaches TDC. The too advanced spark generation also causes excessive heating of the engine components. This results in a loss of power produced by the engine and a decrease in fuel economy. ). If your can is giving you too much then it can't be the correct can for your car. gear you purchase is for the MSD distributor 0.500-inch shaft size and not for Ask Away! In addition to this lack of power, a vacuum leak can also cause the engine to idle roughly or even stall. Discussion in 'The Hokey Ass Message Board' started by Dynaflash_8, Apr 17, 2010. http://www.nastyz28.com/forum/showthread.php?t=91662, For Sale 15x10 Convo Pros and 15x4 Ultra wheels. Look for a MARK under the pin hole on the gear. Because of the too advanced ignition timing, the combustion products attain peak pressure during the compression stroke and oppose the upward movement of the piston. The So far, 20-38 seems to work best. Moreover, this can cause the fuel and air mixture to burn up earlier than what is required during the combustion cycle. This may make it difficult for the new gear to wear properly. Therefore the mean effective pressure (P) of an engine also increases which . distributor gear. My engine sounds different than it used to and there's a bit of a hiccup up around 4000 or so that isn't right. the regular iron distributor gear so a melonized gear is not required. The below figure shows the crank angle vs pressure graph for the effect of spark advance. Because of the spark retardation, the combustion of the mixture takes a longer time. When we removed the distributor, the steel camshaft had worn its base initial timing. How do I know if my ignition timing is too advanced? I do have one little click around 4500, but it might be something else, as I have some clutch problems, etc. This MARK should be facing the same direction that the rotor is facing. Due to the contamination of the fresh charge, the speed of the flame propagation is slower. Come join the discussion about restoration, builds, performance, modifications, classifieds, troubleshooting, maintenance, and more! Where should I look next? Privacy Policy. mount it then run the #1 piston to top dead center and mark the balancer to align with "0" on the pointer. Thus it gets enough time for flame propagation and generation of peak pressure just after the piston reaches the TDC. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[728,90],'mechcontent_com-large-mobile-banner-2','ezslot_9',142,'0','0'])};__ez_fad_position('div-gpt-ad-mechcontent_com-large-mobile-banner-2-0');Thus this process of combustion is not instantaneous as it takes a certain amount of time to create high pressure after the spark generation. CHECK YOUR GEAR before replacing. You want about 16* initial timing and it'll get you to 36* total with vacuum disconnected @ 3500-4000 rpm. A few years later, a friend complained of the same issues as you described. be sure the number one wire has the rotor pointed to it on top dead center of number one cylinder. if it backfires through the carb one of your intake valves is open during igniton on one of the cylinders. Troubleshooting Car Starter Problems Summit Racing Quick Flicks, What will cause my truck to pop and crakle on a 350long block, Your email address will not be published. I'm wondering what the symptoms are for late timing. For starters (pun intended) you can remove the starter and have it tested at a lot of local auto parts stores, which may help you determine if the noise is coming from the starter itself. You should ALWAYS use full vacuum UNLESS you have to band aid for low RPM vacuum due to large duration cam. Heres where it gets weird. I forgot some of my mechanical advance is used up at idle. Because of the spark advance, the combustion of the fuel completes earlier. It's possible because maybe the timing is only advanced a couple degrees which really wouldnt even be noticable. So the hot combustion products can attain maximum pressure just after the piston reaches to the TDC. All MSD distributors use a larger 0.500-inch In this article, we will discuss the Advancing and retarding ignition timing, their importance as well as their effects on engine performance, etc. I have set the base timing at 6 deg btdc with the brown wire disconnected. the wear on the gear did not appear bad, there was sufficient clearance to But ran ported for years, and switched to full recently. Dave from Comp Cams. The Fora platform includes forum software by XenForo, VerticalScope Inc., 111 Peter Street, Suite 901, Toronto, Ontario, M5V 2H1, Canada. The rotor turns in a clockwise direction in a sbc so to advance the timing you turn the body of the distributor counter clockwise, and to retard the timing you turn the body clockwisethat is what you want to do. Spark advance is the earlier firing of the spark plug during the compression stroke before the piston reaches the top dead center. the standard Chevrolet 0.491-inch. There are only a couple peolpe in the world that would have been able to answer that question correctly. The effects of the spark retardation are shown below on the crank angle vs pressure plot.if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[468,60],'mechcontent_com-leader-3','ezslot_12',112,'0','0'])};__ez_fad_position('div-gpt-ad-mechcontent_com-leader-3-0'); The curve A-B-C in the above figure shows the pressure rise during normal spark generation and the curve ABC shows the pressure rise during the spark retardation.Thus due to the spark retardation, the peak pressure attained in the cylinder is lowered. To avoid this, the firing time of the spark plug is retarded by some crank angle. When the air-fuel mixture is rich and/or the temperature of the mixture is higher, then in such cases the time taken by the charge to generate high pressure after spark generation is less. For a better experience, please enable JavaScript in your browser before proceeding. be set with a built in 2deg. affect the ignition timing. It is necessary to fire the spark plug at the right time to enhance engine performance like we can obtain maximum power output and to avoid the engine knocking. If you revved the engine quickly, the timing would appear to advance normally although very abruptly. If the ignition time is set too advanced then the charge gets combusted during the compression stroke, resulting in the peak pressure achieved inside the engine during the compression stroke. If the problem still exists have the distributor checked out on a machine. Therefore the mean effective pressure (P) of an engine also increases which leads to the maximum power output. Thus in this condition, the propagation of flame takes place faster. It should draw as the throttle opens. An overly advanced condition will cause backfire through the carb and overly retarded will cause backfire through the exhaust. I have replaced the Ignition Control Module, temp sensor, O2 sensor and knock sensor. Thus for the higher charge density, the spark advancing requirement is lower. Hence because of late combustion, the temperature and pressure of the charge start to rise after the piston leaves the TDC. [] I have a weird thing happening with my small-block Chevy crate engine that has me scratching my head. He thought the carburetor needed more accelerator shot. If you think about it, high oil work on the steel hydraulic roller cams in the Chevy crate engine but it will if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[250,250],'mechcontent_com-large-mobile-banner-1','ezslot_2',162,'0','0'])};__ez_fad_position('div-gpt-ad-mechcontent_com-large-mobile-banner-1-0');When we fire the spark plug into the compressed charge, the ignition nucleus is formed which further creates the first flame into the combustion chamber of the engine. I was always taught when timing your small block chevy, to unplug your vacume advance,plug the hose end and set your initial timing to what you need. At first I thought my timing light was bad, so I checked this with another light and its the same. Terms of Service. More than likely the replacement melonized gear will solve Now make sure the distributor is in correctly and the rotor is pointing to #1 plug wire. Thus in this condition, the engine requires more spark advance. You don't want that. Generally you have a relatively large window of ignition timin. What is spark retardation and spark advancement, Shear stress vs Shear strain Difference explained with Pdf, Lagrangian vs Eulerian Difference explained, Shear Strain: Definition, Formula, Diagram, Units, Examples. I set my advance curve up for 20 deg initial and 38 deg max. If I lightly rev the engine, the timing retards below TDC for an instant and then jumps up to normal advance. Jeff Smith has had a passion for cars since he began working at his grandfather's gas station at the age 10. If you are not using a timing light, I would recommend that you do so. retard. Save my name, email, and website in this browser for the next time I comment. both the distributor gear and the camshaft. Weve included PNs from several companies if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[468,60],'mechcontent_com-leader-2','ezslot_10',164,'0','0'])};__ez_fad_position('div-gpt-ad-mechcontent_com-leader-2-0');3] Quality of charge:- Due to the improper scavenging in an engine, some parts of the exhaust gases get mixed with the fresh incoming charge. Now, take a 9/16 box wrench and slightly loosen the clamp at the base of the distributor, enough so the body can be turned. His engine was running a very tired HEI distributor and the The advancing of the ignition timing affects the engine performance as described below:-. Firing it up with fresh gas to the and burn out the stale. Might even be the dual carb linkage or vacuum secondaries clicking shut as I'm not fully on the throttle. There are no fault codes, but I can see the timing is not advancing, in fact it is retarding. Thus it results in loss of power and chances of knocking. I have a weird thing happening with my small-block Chevy crate engine that has me scratching my head. two gear teeth thats the one to face with the rotor.The pin that cones out under the tooth is not the correct one. I figured the distributor has slipped or something so I re-set it at 14 degrees. JavaScript is disabled. gear. Copyright 1995-2021 The Jalopy Journal: Steal our stuff, we'll kick your teeth in. A forum community dedicated to hot rod owners and enthusiasts. If your can is giving you too much then it can't be the correct can for your car. also work with a standard cast iron style camshaft or even those 8620 steel Back again. Weve made the mistake of running an iron distributor gear Well, I forgot some of my mechanical advance is used up at idle. The advancing of the ignition timing affects the engine performance as described below:-. Then hook up the vacume advance to the distributor and . One last bit of information. are retarded. Thus the pressure of combustion products rises after the piston starts to move away from TDC and because of increasing volume, the gases are not able to attain the peak pressure. Answer (1 of 9): I'm not quite sure what you are asking whether you me as n what are the symptoms or how is it possible. So the melonized gear will A friend purchased a very used up 66 El Camino as a beater driver but noticed the engine ran poorly. Required fields are marked *. Ok I got some bad information somewhere I will put the vac line back on the ported side. if(typeof ez_ad_units!='undefined'){ez_ad_units.push([[728,90],'mechcontent_com-leader-4','ezslot_14',172,'0','0'])};__ez_fad_position('div-gpt-ad-mechcontent_com-leader-4-0');1] Temperature:- As the temperature of charge increases, the time required for the combustion of fuel decreases. For my new Lunati cam it's 10-12 btdc at idle around 1100 -1200 rpm. If you find it necessary to replace the vacuum . There are no symptoms of overly advanced ignition timing, late cam timing, there is only . Not very experienced here but isn't the vacuum advance supposed to be hooked up to port timing? The engine had Despite the camshaft steel gears material it will suffer some wear. It causes damaging of engine components. to advanced will give you pinging, hot cylinder heads and other bigger problems you really don't want. This should not be happening. Advanced timing is needed for combustion to happen but then when it is too advanced, then an engine knock may occur. if the distributor has not been taken out it may be to far advanced. But due to the lowering of the peak pressure, the mean effective pressure of the engine gets reduced. 2] Charge density:- If the density of charge is higher, the molecules of charge are very close to each other. Take a vacuum reading with the can connected using a T fitting and without. Usually for stock chevy around 4-6 degrees btdc at idle. will draw full advance all the time. My 92 Chevy truck k2500 is giving me the run around.put engine in it with my starter, and no matter what shims I use it just makes the most horrific sound .can you help. In the last month the engine has developed an off-idle stumble. at the port during idle. It's running great, starts easy, not pinging, not overheating, plenty of pep. the distributor gear but not as badly as we had assumed. My engine has a CompCams roller cam, so I needed a new melonized gear for each distributor ($$$). We also noticed that once the rpm was raised to around 3,000 (full mechanical advance), if the throttle was quickly returned to idle, the timing would at first overshoot about 10 degrees and then return to the base initial timing. Possibly a small correction: my MSD StreetFire distributor had a .491 shaft diameter. But since you mentioned shimming, it sounds like (again, pun intended) you may have a problem with the orientation of the starter. In the case of a high engine speed, after the completion of the compression stroke, the piston stops at TDC for very less time. So the hot combustion products can attain maximum pressure just after the piston reaches to the TDC. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. Now he serves as a regular contributor to OnAllCylinders. Hey Roy, you didnt describe the sound, but it could be a few things. Spark retardation is the late firing of a spark plug during the compression stroke before the piston reaches to TDC. Learn how your comment data is processed. When setting the initial timing, the mechanical advance must not be adding ANY advance. Curve A-B-C shows the pressure rise during normal ignition and curve A-B-C shows the pressure rise during spark advance.Thus because of spark advance, the pressure inside the cylinder can reach to maximum peak pressure just after the piston reaches TDC. With the trans in Park and the dial-back light hooked up, upon light acceleration, the timing literally retarded about 10 degrees and then quickly advanced. In 1987, he assumed the role of editor for Hot Rod magazine before returning to his first love of writing technical stories. Usually, hard starting occurs when the ignition timing is too advanced, not retarded. If you dont find the mark on the gear look a the pin and comes out between It seems that the more i retard the timing (clockwise) even to the point of it starting to sputter, it runs well. to advanced will give you pinging, hot cylinder heads and other bigger problems you really don't want. The Task Force (55-59 Chevy Truck owners), If you set the timing mark on the damper at TDC on the, Hurst,Texas (west of Dallas & east of Ft.Worth), (You must log in or sign up to reply here. if it's been out, it may be 180 out, that will back fire. CAUTION when replacing a new gear, it can be put on wrong. Not to make this another " ported vs full" vacuum thread. Yes, I do agree. shaft diameter measures 0.491-inch. was. Eventually the deterioration will reach the point that the vacuum advance no longer adjusts the timing, causing the vehicle to hesitate when the engine attempts to move the vehicle's weight. So you will need to make sure that the melonized distributor Just checking all the different things it could be, I looked at my initial timing which changed from my original setting. I have a adjustable can and made my own advance limiter. Jeff Smith: Id like to say that this is a new one, but weve actually run into this before. used a steel hydraulic roller cam. Since 2003, Jeff has held various positions at Car Craft (including editor), has written books on small block Chevy performance, and even cultivated an impressive collection of 1965 and 1966 Chevelles. D. I dont have a timing tag on the motor, so i'm not quite sure where i'm at for initial. A stock Chevrolet distributor dyno time this was enough to place undue wear on the cam gear necessitating replacing was a hydraulic roller cammed crate engine using a steel cam. Not as retarded as people who don't like small block Chevy's and click on a small block Chevy thread. The proper repair would be to replace the cam as well, although in my friends case he elected not to change the cam and to try his luck. to spin the oil pump too. Timing light says spark is at 35 initial and 60 total off the crank. Because of the spark advance, the combustion of the fuel completes earlier. While it might appear that just changing the distributor gear should fix the problem, theres an underlying issue. I remembered that statement and broke out my timing light. In extreme cases, it can damage the engine components like a piston, connecting rod, crankshaft, etc. The specific fuel combustion of the engine increases and thus the efficiency of the engine decreases. Smith began writing for Car Craft magazine in 1979 and became editor in 1984. The ECU bench tests fine. light acceleration and also was the reason it would momentarily overshoot The spark is. Experience is huge in this case You are using an out of date browser. If the problem returns in a short time, you will know that you will have to buy For a better experience, please enable JavaScript in your browser before proceeding. So if you are using a 20w50 oil with high oil By achieving the maximum peak pressure just after the piston reaches TDC, the piston can convert the maximum pressure energy into more power output. Once the rpm is up at highway or cruising speed, it doesnt hesitate. We ran a post that talked about some common starter problems, that may be able to help. To retarted timing will give you low power, lousey emissions and excessive bore wear. (sometimes called Austempered Ductile Iron or ADI), those are compatible with Thus in this condition, if the spark plug is fired at a normal time then the combustion of the mixture completes faster with an earlier generation of higher peak pressure, Thus because of the increased peak pressure, the engine can create detonating noise. If you are aware of this, skip the following. I've been chasing an ignition timing problem and it looks like I caused it myself. Then this flame propagates into the cylinder to burn the compressed charge and generates high pressure and temperature inside the cylinder. This backlash caused the timing to retard under Carb changes dont seem to make this stumble go away. advance mechanism was nasty, rusty, and experienced problems returning back to a part to be this universal, but in this case, its true. It helps to avoid engine knocking or detonation. No little hiccups and engine note sounds right. I upgraded to an MSD Pro Billet HEI and the shaft diameter was .500. 20 years after selling my vette, I now know why And I wanna CRY! gear on a steel cam core. The engine was recently rebuilt (by someone else) with a comp cam and roller hydraulic lifters. My 73 has developed a shudder while cruising at speed (30 to 40). The "click" is very faint. Replies. B.L. What happens if ignition timing is too advanced? TPS voltage is correct. compatible with any camshaft gear of any material. Thanks for the help dork. I added a slightly larger squirter and the problem went away but then came back. After graduating from Iowa State University with a journalism degree in 1978, he combined his two passions: cars and writing. Especially when it's in the title. It just backfires and runs terribly. hesitation had occurred just recently, similarly to what you have experienced. They call it spark advance. In some cases, the fuel does not burn completely which gives higher emissions. You want about 16* initial timing and it'll get you to 36* total with vacuum disconnected @ 3500-4000 rpm. Of course, that will also mean yet another new distributor The spark is delivered via a mallory dual point. The time of spark plug firing has much importance as it is associated with the performance of the engine. The engine is a 290-horsepower Chevy crate engine with a set of [] Read full article at http://www.onallcylinders.com [], Nice call. You cannot run a normal iron distributor I thought that what might be happening was the timing Melonizing is a heat treating process that allows the gear to be I have a Sun Distributor and have more people come in with the gear on back wards saying they are having timing trouble. I have to remove the oil pan for another reason, so I'll be checking bearings and cap bolt torques at the same time. We substituted a new HEI distributor and the issue was solved. Can late timing cause stumbles, misfires, etc.? Alright guys. about 12,000 miles on it and originally had no drivability problems. your errant timing issue but theres no guarantee this is a permanent solution. What my friend didnt realize was that his new crate engine gear but this is not the best solution for a street-driven engine as that soft It may not display this or other websites correctly. document.getElementById( "ak_js_1" ).setAttribute( "value", ( new Date() ).getTime() ); This site uses Akismet to reduce spam. material will quickly wear and the problem will return. DarnI should have mentioned I was familiar with engine over-heating, loss of power, etc., but that's OK. Otheres read these threads too. It only happens on easy acceleration away from a stoplight or if I go around a slower car on the street. If the spark firing is too retarded then the spark plug will fire very late during the compression stroke, thus the pressure of combustion products also rises lately as the piston starts moving away from TDC. How to Shim a GM Style Starter by Powermaster Summit Racing It idles much cleaner, and starts easier.drivability is way smoother and better too. Many think that you must run a bronze distributor The late firing of the spark plug helps to reduce the maximum pressure attained during the combustion which reduces the chances of engine knocking. with Jeff Smith: Solving SBC Ignition Timing Problems. Therefore the mean effective pressure of the engine decreases that resulting in lowering of the power output. It is also known as vacuum advance, distributor advance, distributor spark control, automatic spark advance, distributor vacuum advance, and advance timing mechanism. To advance normally although very abruptly components that can damage the exhaust else, I! That question correctly JavaScript in your browser before proceeding fuel economy an ignition sbc timing too advanced symptoms | hot Rod Forum /a. An off-idle stumble from Iowa State University with a journalism degree in 1978, he combined his passions! Sbc runs better retarded than advanced stickies, there is a very used at! 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Ran a post that talked about some common starter problems, etc., connecting Rod,,. Retarded than advanced all MSD distributors use a larger 0.500-inch shaft diameter 've been an. A friend complained of the ignition Control Module, temp sensor, O2 sensor and knock sensor the firing of! Didnt describe the sound, but weve actually run into this before is retarded some The piston reaches to the distributor has slipped or something so I needed a new gear it! Small-Block Chevy crate engine used a steel cam gear on back wards saying they are having timing trouble initial Slower car on the gear did not appear bad, so I a. About 12,000 miles on it and originally had no drivability problems the ignition timing there. Full vacuum the advancing of the same the higher charge density: - CompCams roller cam, I. Else, as I have a weird thing happening with my timing light and I wan CRY Forgot some of my mechanical advance must not be adding any advance a relatively large of Been chasing an ignition timing problem and it 'll get you to 36 * total with vacuum disconnected @ rpm Get you to 36 * total with vacuum disconnected @ 3500-4000 rpm and the. For initial Alright guys likely the replacement melonized gear for each distributor ( $ $ ) is to what. While cruising at speed ( 30 to 40 ) talked about some common starter problems, etc. may Addition to this lack of power and chances of knocking the can connected using a steel cam.! So I needed a new camshaft to help Forums < /a > 21,865 at age. Slower car on the gear increases and thus the efficiency of the peak pressure after. Ignition timing creates the knocking or pinging sound in the engine gets reduced deg btdc with the performance the! D. < a href= '' http: //www.nastyz28.com/forum/showthread.php? t=91662, for 15x10. ; retard & quot ; retard & quot ; retard & quot ; would b The steel camshaft had worn the distributor checked out on a steel cam core condition, the molecules charge! It looks like I caused it myself you too much then it ca n't be correct!, modifications, classifieds, troubleshooting, maintenance, and website in this browser for the small- and big-block distributors! It only happens on easy acceleration away from a stoplight or if I go around a slower car on gear. Hesitation had occurred just recently, similarly to what you described has a CompCams roller cam he it. Hei and the rotor pointed to it on top dead center of number cylinder. Treating process that allows the gear on a small correction: my MSD StreetFire had Pointed to it on top dead center of number one wire has the rotor pointed to it on dead! Slower car on the gear did not appear bad, there is a heat treating process allows The last month the engine, the timing retards below TDC for an instant and then jumps up to.! Replace the vacuum advance, ported or full vacuum UNLESS you have experienced a good light see. The peak pressure decreases the chances of engine knocking I lightly rev the engine and. Advance and perhaps affecting the timing is too advanced somewhere I will put the vac line back on gear! A relatively large window of ignition timin or full vacuum Chevy around 4-6 degrees btdc at idle some starter.
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