DFI, Batch Fire, and other myths

[Bruce Plecan]

-----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
>