Unless you race, you probably wouldn't notice a difference between
150psi compression and 175. This also means you can run fine on
91 octane pump gas (or less). Unless your engine feels "tired," I wouldn't
worry about it.
I'd be more concerned about the oil pressure, it's about 10-15psi below
the "norm." Check your gauge against a known good one first.
I don't know if the BJ7 has the rotor-type pump, or the gear-type, which
seems to give a bit less pressure, especially at idle. My BJ8, with the
gear-type pump, gives 45psi at cruise when hot (and nothing+ at idle, but
it's been like that for 60K miles, so I don't worry about it).
bs
Dave Leland wrote:
>Does anyone have any thoughts on my compression
>readings below? My Haynes manual says to expect
>about 175 lbs and I'm lower (but consistently lower).
>
>How long can I wait for a rebuild is my main concern.
>
>#1- 147 lbs
>#2- 150 lbs
>#3- 149 lbs
>#4- 151 lbs
>#5- 148 lbs
>#6- 150 lbs
>
>The car is a BJ7 with probably 80k miles and oil
>pressure is 30-35lbs when warmed up at cruising speed.
> Thanks for your thoughts.
>
>Dave Leland
>Nashville, TN
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