At 12:57 AM 4/27/97 +0100, you wrote:
>I thought that was a pretty neat diagnostic method. Two
>gauges and he was pretty sure where the problem was (compression test)
>and what the problem was (lead down test). Cool.
>
>I just may need to get one of those leak-down gauges to complement my
>compression teseter. Summit has one in their catalog that is a Tavia,
>has the part number TAV-08015 and is priced at $63.69. Their compression
>tester is part# SUM-900009 for $21.99 (older catalog not listing their
>toll free number 330-630-3030. of try their web site at
>http://www.summitracing.com).
>
Bob-
This is a very common tool used in the piston aircraft maintenance industry,
although they use 80 psi as the standard (of course you have a bit more
leverage to stop the engine from turning - a 6 foot diameter propeller!).
My recollection is that there is a calibrated orifice between the two
gauges, and that you are actually using the second pressure reading to
indicate a leakage rate with a higher pressure corresponding to lower
leakage rate. It's an excellent diagnostic tool - I've often wondered why
auto mechanics don't use them.
Rich Mason
'73B
Huntsville, AL
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