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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Re: Induction air filter

John:

**I have been flying this system for 18 months and 150 hours, including 
a Sun 100 and an AirVenture Cup race. I have not destroyed my engine 
with detonation even though it has 10:1 pistons.**


I do not doubt that.  Detonation is not nearly as destructive as many 
assume it is.  The problem is that detonation cracks spark plug 
ceramics which can result in pre-ignition, which can destroy the engine 
in 30 seconds or less.  We have way too much hard data on this to 
discount it.

Do you have any idea how high your ICPs are?  Have you measured them?  
We have measured them in engines set up like yours.  It can be quite 
scary.  Be CERTAIN you are VERY rich at high power to keep the ICPs in 
line.  It takes a lOT more fuel than most would think.

Walter