Subject: Re: Hi Compression?
Author: Martin Cooke
Date: Jul 15, 2002, 12:17 AM
Post ID: 1710603826
165 would be normal for an Eldo, 195 is about right for a Le Mans.
i wouldn't worry about it unless you are getting pre ignition (knock) which
will probably be caused by something else anyhow. does it run alright?
it could be your guages just read high. or you have non standard pistons.
if you really need to get the carbon off, you might as well take the
cylinders & pistons off as doing it with the cylinders on will disturb the
base gaskets. scrape with copper scraper made from flattened household water
pipe ( do you have coppper water pipe in US? i dunno).
cookie
----- Original Message -----
From: "Alan Dunphy" <adun-@midmaine.com>
To: <Loopfram-@topica.com>
Sent: Monday, July 15, 2002 5:19 AM
Subject: Re: Hi Compression?
| Vince, Most likely, it would be carbon buildup on the top of the piston |
| in the combustion chamber. Carbon can be the result of constant speed |
| 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 |
| 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 |
| 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 |
| 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 |
| out the exhaust. If the carbon build up is heavy this method is used it |
| 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?
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