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From: Walter Atkinson <walter@advancedpilot.com>
Subject: Re: [LML] Re: Plasma III on Hi Compression Engines
X-Original-Date: Thu, 12 May 2005 14:13:51 -0500
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The detonation margin is pretty good with the 7.5:1 CR.  That's why=20
they did it.

A large part of the detonation margin is CHT.  Cars use a water-cooled=20=

engine that keeps CHTs very cool.  It doesn't always work too well. =20
The ping we've all heard is detonation.  Remember those are seldom=20
aluminum heads!  Also, detonation isn't all that bad on the engine. =20
It's very hard on spark plugs which are a source of pre-ignition which=20=

is VERY bad on an engine.

Walter


On May 12, 2005, at 2:09 PM, colyncase on earthlink wrote:

Walter,=A0 so how narrow is it on a TSIO-550 with 7.5 CR?
How is that cars can run 10.0 CR?


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The detonation margin is pretty good with the 7.5:1 CR.  That's why
they did it.


A large part of the detonation margin is CHT.  Cars use a water-cooled
engine that keeps CHTs very cool.  It doesn't always work too well.=20
The ping we've all heard is detonation.  Remember those are seldom
aluminum heads!  Also, detonation isn't all that bad on the engine.=20
It's very hard on spark plugs which are a source of pre-ignition which
is VERY bad on an engine.


Walter



On May 12, 2005, at 2:09 PM, colyncase on earthlink wrote:


<fontfamily><param>Arial</param><smaller>Walter,=A0 so how narrow is it
on a TSIO-550 with 7.5 CR?</smaller></fontfamily>

<fontfamily><param>Arial</param><smaller>How is that cars can run 10.0
CR?</smaller></fontfamily>



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