[Diy_efi] false myths

[Ernest Buckler]

Top reply:  Are we not talking about the difference between best BURN AF 
ratio, and best EXPLOSIVE AF ratio?   I know that when we make our holiday 
oxy-acetylene bombs, we lean out the welding torch til it fails to burn, 
then insert it into the ziploc bag, for the biggest boom; rich mixtures are 
often duds - at least in this useage.    [:oj     Burn is good, explode is 
bad, yes?

Ernie B

----- Original Message ----- 
From: "Michael Richards" <michael at fastmail.ca>
To: <diy_efi at diy-efi.org>
Sent: Friday, April 01, 2005 8:46 AM
Subject: Re: [Diy_efi] false myths


>> BTW, these are the same guys, a person on this list, whom I lost most
>> of my respect for a couple of years ago, and I've nicknamed 'bear',
>> not to long ago labeled this group 'parrots'.  LOL.  They have, with
>> today's technology, actually monitored the combustion chamber of a
>> live, operating production engine, collecting and logging data in the
>> process. How many 'parrots' do you know, have done this?  Millions?
>
> Only one person I know of outside OEM test labs... I will see if I can
> get you some datalogs of a lean misfire. This is on a one cylinder test
> engine but it's being developed as a test bed for some detonation
> detection work we're doing. You will see the cylinder pressure go up
> from the initial ignition and then stop short of a normal pressure
> curve accompanied by a jump in HC emissions. This is absolutely nothing
> new.
>
> Sometimes you also see the EGTs going up during enleanment because of
> the slower and less consistant flame front. This is not an increase in
> total heat as someone else pointed out there is less fuel available
> than in an ideal mixture.
>
> -Michael
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