Wow man, i've been nudging some guys to push the envelope a little more on their limited use "hot rod's", but this one really has me thinking.
Thanks for posting your numbers. :thumbrig:
I assumed you have the Lunati with 316/326 advertised duration. Looking at the XE285HL and the 509, it's hard to comprehend that the cranking compression/knock tolerance could be worse with the Lunati?
Grasping at straws here, But is there any way that cam was misground or mismarked?
Keep us informed. This could be a learning experience for some of us.
Good Luck, Rick
What did the chambers look like? Did they have carbon buildup too? Carbon buildup makes the chambers smaller which can aid in detonation. It also retains heat which can promote detonation and preignition.
You can tell where the pistons are the cleanest at the tops, thats where the quench pads are.
**** if I know. It would totally suck if what you were hearing was something else.
I still have no clue at this point. I can't help but thinking about your predicament, but I have no remedy for it. :banghead:
Since there seems to be no physical signs of detonation, what else could it be? What else makes a knocking noise that goes away with higher octane fuel?
This one boggles the mind. Most people say my CR shouldn't knock, but I heard something. Now if the parts don't show any evidence of detonation, what the heck do I do now?
Piston slap.
Just a comment, but didnt he say octane didnt matter?
That's true-he said the sound he interpreted at detonation never subsided until he mixed in 110 octane...don't recall the ratio, but he stated it was scary fast when he was able to stay in it with no fear of detonation.