DFI, Batch Fire, and other myths

[Marc Piccioni]

Try lead fouling from using 100/130 in an engine designed for 80/87....... 
happened to me at 7000'.......... exciting time until I leaned out the 
engine enough to burn off the excess lead.......

----------
From: 	Bruce Plecan[SMTP:nacelp at bright.net]
Sent: 	January 21, 1999 4:05 PM
To: 	diy_efi at efi332.eng.ohio-state.edu
Subject: 	Re: DFI, Batch Fire, and other myths


-----Original Message-----
From: Shannen Durphey <shannen at grolen.com>
To: diy_efi at efi332.eng.ohio-state.edu <diy_efi at efi332.eng.ohio-state.edu>
Date: Thursday, January 21, 1999 5:33 PM
Subject: Re: DFI, Batch Fire, and other myths

AV gas is/was extremely low ash.  Fouling plugs at 10,000' is not a minor
issue,
specially on a 4 cylinder.
Bruce

>Greg Hermann wrote:
>>
><snip>
>> >According to a service bulletin, the 3.8l engine suffers from carbon
>> >accumulation on the back of the intake valve which significantly
>> >reduces performance.  I've seen the effects. It's very similar to
>> >losing the accelerator pump on a carb'ed engine, and the exhaust is
>> >excessively rich.  My thought was the carbon is insulating the valve,
>> >preventing vaporization.
>> >Shannen
>>
>> The carbon (more accurately coke, the black kind)  is residue from the
>> gasoline. Run av gas and it won't happen :-) !! It can also restrict
>> breathing pretty drastically.
>>
>> Greg
>Lessee... Av gas was missing something, maybe detergents or the added
>lubricants that are in auto gas?  Can't remember.  Is there any truth
>to the story that unleaded av-gas is more correctly called low lead?
>Shannen
>




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