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Engine compression

Subject: Engine compression
From: Gramin@aol.com
Date: Wed, 9 Jul 1997 04:48:05
" Checking by the commonly used pressure difference method: Place orifice of
1mm dia and 3mm length between the two pressure gauges... max pressure drop
25%"

---From Rotax 912UL operators manual.

What two pressure gauges ? Anyone know what this means ?  
An Austrian perhaps?

Graham C.


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