Re: 8N compression values

Posted by RAB on November 08, 2008 at 15:09:54 from (195.93.21.10):

In Reply to: 8N compression values posted by Carl Anderson on November 08, 2008 at 13:11:58:

First question is: have you checked the pressure guage?

Next is exactly how did you test it?

Next, did you do a 'wet' test? following the 'dry' test.

Next, is this a running engine or has it been standing a long time?

Next, did you remove all spark plugs, hold the carburettor butterfly open and make sure the choke was free?

Is the starter turning it fast enough?

Next, are the valve clearances OK?

Next, how even were the results for each pot?

So you see, just saying they are low may not mean a great deal as we don't know any relevant detail.

Personally, I reckon they are higher than you are telling us. The reason for this is that usually there is a large variation on a worn out engine (from pot to pot). Compression tests indicate several possible faults and you have given little information, as to how the pressure rises, differences, actual values, so we could not comment on valves seating, rings or gasket faults.

Regards, RAB

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