Subject: Re: Hi Compression?
Author: Alan Dunphy
Date: Jul 14, 2002, 9:21 PM
Post ID: 1710603424
Vince,
Most likely, it would be carbon buildup on the top of the piston and
in the combustion chamber. Carbon can be the result of constant speed usage.
It will most times be accompanied by spark nock, sounds like pins rattling
in the engine, especially under a load. There is only one safe way to remove
it, pull the heads off. Put a bit of grease in the gap between the piston
and the cylinder then scrape the top of the piston using care not to gouge
the metal of the piston. Cleaning the combustion chamber will require even
more care not to gouge the metal or damage the valves. Carbon is very
abrasive so be sure to get all the residue cleaned out before reassembly.
Most of the grease will stay at the top of the cylinder when the piston is
lowered and trap the grit making it easier to clean. Gouges in the metal can
cause hot spots and preignition (spark nock). If you are not getting spark
nock with a good grade of high test gas your problem is not as serious and
may be cured with several hard accelerations followed by equally hard
deceleration in second or third gear. The theory being that the sudden
changes in combustion chamber temperature will loosen the carbon and blow it
out the exhaust. If the carbon build up is heavy this method is used it can
damage the engine if a large particle of carbon gets caught in a valve on
into the ring area. Good luck with your solution.
Alan
'74 Eldorado LAPD Wixomized
MGNOC 4352
Alan R. Dunphy
adun-@midmaine.com
Pittsfield, ME 04967-1426
----- Original Message -----
From: <lio-@aol.com>
To: <Loopfram-@topica.com>
Sent: Sunday, July 14, 2002 11:18 PM
Subject: Hi Compression?
| Today I checked the compression in my Eldo. Both cylinders read 190psi. If my memory serves me well this is a bit on the high side. Does anyone know the proper specs? If it is too high, what might be the cause? Thanks........ Vince in NY |