How did you solve your pinging problem?
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How did you solve your pinging problem?
I've posted this topic about pinging off and on, several times. I still have pinging.
Short history: Original 11:1, 350 hp engine; rebuilt in 2006: bored .030 over, same qjet carb and dist, new identically specd camshaft from GM... I realize my compression is more than 11:1 now, with the 30-over bore. How much more, I don't know.
I run only Sunoco 93, or BP 93 or Shell. I started using Max Lead 2000, which has improved the power and helped with the pinging, but it still pings under heavy load. It doesn't seem to matter what rpm range. When you bury your foot in the pedal, you get pinging. The secondaries hardly even get time to open, before you hear it, and have to lay off...
Here's what I've done to-date:
The only thing left I am going to try is, to block the heat crossover in the intake manifold, using the little blocker plates that come with the gasket set. I will try this within the next 2 weeks.
I'm just about done trying to tune this myself. I may end up taking it to one of two Corvette shops in MD and see if they can help.
If you solved your pinging issue, I'd like to hear what you did. Thanks -
Short history: Original 11:1, 350 hp engine; rebuilt in 2006: bored .030 over, same qjet carb and dist, new identically specd camshaft from GM... I realize my compression is more than 11:1 now, with the 30-over bore. How much more, I don't know.
I run only Sunoco 93, or BP 93 or Shell. I started using Max Lead 2000, which has improved the power and helped with the pinging, but it still pings under heavy load. It doesn't seem to matter what rpm range. When you bury your foot in the pedal, you get pinging. The secondaries hardly even get time to open, before you hear it, and have to lay off...
Here's what I've done to-date:
- Had Lars rebuild distributor and carb in 2006
- tried to tune it using Lars' paper
- experimented with different springs on advance
- bought an adjustable vacuum advance
- used Max Lead 2000 (Tetraethyl lead additive)
- experimented with running with vac advance disconnected
- experimented with different total timing
- currently at 30 deg total centrifugal timing
The only thing left I am going to try is, to block the heat crossover in the intake manifold, using the little blocker plates that come with the gasket set. I will try this within the next 2 weeks.
I'm just about done trying to tune this myself. I may end up taking it to one of two Corvette shops in MD and see if they can help.
If you solved your pinging issue, I'd like to hear what you did. Thanks -
