Quote:
Originally Posted by dataway
Not saying that is definitely your problem ... it was obvious in my case that the carb was too small .... installed a larger carb and was done.
The sound is actually a bit more like you would imagine a .22 caliber machine gun might sound.
Lean enough to cause a lean miss would have surely been spotted on the dyno so I doubt it's your problem.
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Thank you for the reply. I've been struggling with compression / octane issues. The previous owner doesn't remember / have the engine build details, and I am new to the automotive hobby. The only thing I know for sure is that on 91 octane the engine diesels substantially, which doesn't happen on 100 octane. The sound of engine pulling is better with 100 octane as well. I don't know what really pinging sounds like, and I am unsure what the crackling sound at WOT is.
On the dyno, I was 1 point lean at WOT. We up-jetted the end carbs, and it didn't move the number. We also advanced the timing from 12/32 and the hp / torque didn't change. All this is contrary to accepted doctrine.
One day, I may pull the engine, re-gasket, aluminum heads, etc... It's just so expensive, so I just pay $9 / gallon in race gas until then.