5.7 TBI Questions

[Carl Summers]

Hi All,
 Most of the time build up on the intake valve is a sign of a poor valve
guide and/or seal..........hth's
-Carl Summers

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-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Tom Parker
Sent: Saturday, July 08, 2000 9:07 PM
To: K.E. Towle
Subject: Re: 5.7 TBI Questions


K.E. Towle <karljiml at compuserve.com> wrote:

>1. Engine went bad (exhaust valve stems mushroomed, broken lifter) after
>30K miles. What would cause an observed excessive carbon build up on the
>stem side of all the intake valves?

I have quite thick carbon buildup on the stem side of the inlets in my Mini.
I
am guessing that it is due to a high overlap cam being run at low engine
speeds. Poor combustion going into the inlet on overlap leads to carbon
deposites, which don't go away. The exhuasts were virtually clean, I guess
becasue the exhaust gases burn it off..

--
Tom Parker - parkert at ihug.co.nz
           - http://www.geocities.com/MotorCity/Track/8381/

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