Destroying an Engine
#1
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"It ain’t so much the things we don’t know that get us into trouble, it’s the things we do know that just ain’t so."
A. Ward
Which is more dangerous to a high-performance engine - pre-ignition or detonation?
Some interesting reading...
http://www.contactmagazine.com/Issue...ineBasics.html
Any comments from those who have destroyed an engine?
A. Ward
Which is more dangerous to a high-performance engine - pre-ignition or detonation?
Some interesting reading...
http://www.contactmagazine.com/Issue...ineBasics.html
Any comments from those who have destroyed an engine?
#2
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Great read Wally, thanks.
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+1. I remember reading this when (actually before) I was tuning the Twin-Screw. It is however, worth reading again!
#6
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Thanks Wally it was nice to go back to school for a refresher.
#7
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I played with Mazda wankel rotaries for a while. One little detonation ping = shattered apex seals = most of the engine is now scrap. The long, thin, and narrow squeezing-down combustion chamber makes for uneven mixture distribution and the lean spots at the "tail" end can cause game over, much like the pre-ignition described. Boosted rotaries have to run very rich and have stellar heat removal to survive long. The running joke was the photoshopped "Check Engine" light into a "Change Engine" light.
I kinda wish the author had delved into the "wedge" design combustion chamber we have on 16v 928s (and 944s). I fully grok the 32v chamber dynamics but am weak on the wedge.
I kinda wish the author had delved into the "wedge" design combustion chamber we have on 16v 928s (and 944s). I fully grok the 32v chamber dynamics but am weak on the wedge.
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#10
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On the ignition thing....recently watched a clip about Don Garlits , talking about his life in dragsters. At one stage he was given a new model Chrysler engine to run, but he couldnt get near what he needed out of it, seemed to be a lemon, doing all the normal hot up work. So he thought, I will destroy this POS, and send it back as a dud. He started advancing the ignition in a big way, thinking it would detonate or something bad - it started performing like it should, and the more he advanced it the more competitive it got. Mopar just got the timing wrong.
jp 83 Euro S AT 55k
jp 83 Euro S AT 55k
#11
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great article......I wonder how our engines rate in terms of "fast burn"....since the older 16V engines ran quite a bit of timing, probably not very fast....but the later 32V engines didn't run much timing at all....