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06-08-2010, 12:52 PM #1
Timing - Advance or Retard to stop knock?
I've noticed it as the temps heating up here in Tx. Don't know if it has anything to do with it, but I was wondering if I should mess with the timing to keep it from knocking when I accelerate? When I'm on the the hwy, if I accelerate, it'll knock. I can press the pedal more or back off of it and it quits. Usually around 60 - 65. No vacuum leaks, plugs are good, wires good...all that good stuff. It is carborated so maybe I should lean it up a little? Too many options and no clue where to start. Don't want to do anything if it's not going to make a difference.
Chevy 350, stock, Holley 600...
Thanks for the inputs!!!TNT - Texas
First - '68 longbed (lady runs stop sign, insurance gives me a check)
Then - '81 SWB (stupid stupid stupid...sold it thinking I was going to get something else)
Now - Finally got my '86 (350, Holley 600, 700r4)
06-08-2010, 04:14 PM #2
- Join Date
- Jun 2006
- River Ridge Louisiana-4 miles W of New Orleans-didn't flood-water stopped 800 yards away.
In general you would want to richen it up, and or retard the timing.
Real life I would use 93 octane, if you don't already.
1)Use 93 octane-this should do it, if it hasn't already.
2)Retard the timing a few degrees-3 or so- so it has less advance-for example firing at 15 degrees before instead of 18 degrees before TDC
3)Go up one on the pilot jet-Holley's have pilot jets and main jets right?
4)Don't lug the motor-keep it in a lower gear than you really need-stay in 1st longer, 2nd longer etc.
Do you have a higher than stock compression motor?
06-08-2010, 05:42 PM #3
Hes right, reduce timing to reduce knocking. Thats what knock sensors in newer vehicles do, when knocking is detected they reduce timing.1995 Silverado,Z71, 3-inch lift,2-inch leveling kit, SkyJacker Suspension, short ram-air intake, throttle body spacer, MSD ignition coil, straight pipes
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