DFI, Batch Fire, and other myths

Greg Hermann bearbvd at sni.net
Fri Jan 22 04:08:45 GMT 1999


>-----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

More so on a single engine!!! :-)

Greg
>
>>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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