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Re: 5kt psi compression question

>To: "Richard Miller" <rdmiller@iaml.net>
>From: "Doyt W. Echelberger" <Doyt@nwonline.net>
>Subject: Re: 5kt psi compression question
>In-Reply-To: <01bf3134$829f4680$3c1ab2cf@default>
>Disconnect high tension wire number 4 (center) at cap and connect to
ground with a clamp. Test compression with open throttle, sparkers out and
at oil temp above 86 degrees F.
>Expect normal 116-159.5 psi per cylinder, and use 94.3 psi as a cut-off
point, below which you would consider overhaul.  Also, maximum acceptable
pressure difference between highest and lowest individual readings is 29 psi.
>The above, according to Bentley, for the MC/WU engines.
>Doyt Echelberger
>At 07:46 PM 11/17/1999 -0000, you wrote:
>>I need to know the psi per cylinder on a 85 5k turbo.
>>My compression reader measures in psi and I have no idea how to convert the
>>7.8:1 to psi. Also how much deveation is allowed in the reading before the
>>cylinder is considered "gone"?
>>Richard Miller
>>83 Mazda RX-7 slightly modified
>>81 Mazda RX-7 awaiting boost