Originally Posted by
GizmoJunkie
See now some of the other things that i have read was that pre-detonation is usually right around the max rpm that you can make. Perhaps that is the pop you are hearing? I do believe a change to either nitro content, head shims or colder glow plug might be needed in that case.
I havent heard a "pop" come from my engine. Does it sound like a backfire or something? I honestly dont know that ive ever heard one?
The noise i heard was pretty strange, at this point im really starting to think that i was a touch lean up top, and using a glow plug that was hotter than i needed that day. Like I said hard to describe. maybe like the engine wasnt firing once every 4-5 stokes? Hell maybe it was a bad plug, its been changed since lol.
I think I know what you are talking about and I have only every really noticed it from a tuning bench. When you hit that spot of the borderline of starting to go lean, and watching the smoke, the engine will blow smoke in a random frequency and that is the point I usually back off about an hour on the hsn needle. I do all this by sight and sound and rarely use the temp gun. You can really hear the engine rpm's from the tuning bench.