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Old 10-13-2002, 05:15 AM
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Post spark knock

Have spark knock when engine is warm?
what can i do to get rid of it.

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Old 10-13-2002, 06:10 AM
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Need a little more info, engine type,size, how it's set up, etc. The easy answer is to back initial advance or check maximum advance to make sure that it isn't advancing too far and that it isn't advancing too fast.
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Old 10-13-2002, 01:24 PM
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Some cheapo advance spring kits tell you to use the lightest spring first, however this can sometimes cause the wieghts to advance timing at as little as idle rpm. Give us as much info as you kow so we can help.
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Old 10-13-2002, 01:59 PM
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Actually if the springs are advancing things full on at an idle you will or should have a retardation problem at higher rpm's as the only advance available will be vacuum. There are several scenarios dependant upon the engine's condition. New? Wore out? Carboned up Granniemobile? You can make some mickey mouse marks on the damper with a tape measure to give a rough idea where advance is and how fast it gets there. 10 degrees on an 8 inch damper is between 11/16 and 3/4 inch I believe. Or if you have a large enough area use the timing tab, rotate the engine enough to get 30 degrees, mark it and then play with your timing light to see where you are. Using a vacuum pump on the distributor hose you'll get a feel what the mechanical and/or vacuum advances are doing.

Of course if you aren't doing this under a shade tree and have a modern shop the above can be done with two hookups to a decent machine.



[ October 13, 2002: Message edited by: slider ]</p>
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Old 10-14-2002, 03:53 AM
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Went thru the timing still had knock,removed fan belt[dont ask me why] knock went away?harmonic balancer wobling.Getting new balancer and installtion tool this time. must of tapped balancer to hard and pushed rubber away.engine is 4.3vortec about 5000 miles on it.
Live and Learn.Thanks for info it does run better after doing the timing
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