C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Setting Timing by Ear

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Old Sep 13, 2011 | 05:59 PM
  #41  
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If it was me I would park the car until you get a new damper. Then you don't have to worry about the damper coming apart, and you can actually set your timing, and know it's set right rather than hoping it's close.

I guess if it's your only form of transportation... you do what you have to do.
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Old Sep 13, 2011 | 07:23 PM
  #42  
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Originally Posted by 1963SS
What you're going to attempt is not going to work well.
WHY won't this work well? I've done it a million times. This isn't rocket science (or even close) on mid 80's car. If it pings, bring the timing back until it stops. Ad a degree or two exta retard beyond that if YOU feel that you need the margin for safety.

I've set my timing by ear 100's of times, and "dialed" using the drag-track as a dyno, and even a hill/stopwatch as a poor man's dyno. There is absolutely nothing wrong with following that practice, if you understand what you doing and how the thing functions.

*I* feel that people who nay-say it, do so because they don't "get it". Maybe not but that's the feeling I get when Iread those posts.

I DO agree that you need to R&R the damper; it will only slide worse until ir comes off or rubs a hole through your timing cover.
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Old Sep 13, 2011 | 07:34 PM
  #43  
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Originally Posted by 1963SS
Exactly. That's why I said to use a degree wheel and a piston stop.
That is the BEST way, but in a pinch or on a budget, you can use a coat hangar to make a piston stop, mark you balancer (good or not) at both ends of the piston's travel. Use a tape measure to measure the small distance between the marks...then divid in 1/2 and make a mark. That is TDC. (untill the balance slips more!) At the very least, you can confirm the balancer has slipped or not, for no money.
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Old Sep 13, 2011 | 08:41 PM
  #44  
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Originally Posted by powerpigz-51
Setting by ear was a lot easier in the old days without ESC for sure. You set it at "just before ping" at max load, and called it good. It was almost irrelevant as to where the timing ended up at idle. If this was a problem, you had to file out the slots in the advance plate (or make the slots shorter somehow). I guess it would be hard to see 6 degrees of slippage by a rough guestimate of TDC. Congrats OP on dialing it in to your satisfaction. We were trying to help you get there faster.
Back to the OP's subject of tuning by ear. I agree with how much easier it was to roughly set by ear befor ESC. With ESC, if you wait till you hear ping, knock retard is already maxed out which negates its important power robbing knock prevention function. What we have learned on the load bearing dynos and on the track, max performance occurs several degrees before detonation, so those old schooler's who wait till they hear ping then set back a little are usually not tuned for max performance. Experience will teach to error on the retarded side for max power.

Last edited by dynocar; Sep 13, 2011 at 08:50 PM.
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Old Sep 13, 2011 | 09:03 PM
  #45  
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Originally Posted by dynocar
Back to the OP's subject of tuning by ear. I agree with how much easier it was to roughly set by ear befor ESC. With ESC, if you wait till you hear ping, knock retard is already maxed out which negates its important power robbing knock prevention function. What we have learned on the load bearing dynos and on the track, max performance occurs several degrees before detonation, so those old schooler's who wait till they hear ping then set back a little are usually not tuned for max performance. Experience will teach to error on the retarded side for max power.
And where an engine is going to detonate is dependent on a lot of things, like octane, knock sensor sensitivity, quench, temp, carbon buildup, etc. or whether the ESC (whole system) is working properly. And proper idle on these cars depends a lot on the initial setting, as opposed to carb vehicles.
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