John,
You didn't mention what compression you saw on the first stroke? Did you see
90+ or more? I also usually keep turning the engine over until the reading
stabilizes and use that as the final reading. I also find that putting oil
in the cylinders always brings up the compression, even on the high reading
cylinders. So the 150 reading with oil would probably be 160.
Anyway if you are seeing over 90 psi on the first stroke and all your
readings settle out close to 150 psi, I would say you do not have a problem.
Regards,
Phil Roettjer
67 +4
67 MGB
> -----Original Message-----
> From: jpavone@vanstar.com [SMTP:jpavone@vanstar.com]
> Sent: Friday, October 01, 1999 9:25 AM
> To: morgans@autox.team.net
> Subject: Compression Issues
>
>
> I recently ran a compression test on the nearly stock Ford 1600 crossflow
> in my 59' 4/4 1600 during the course of a tuneup . The compression test
> showed 150, 131, 132 and 149 on cyls 1 through 4 when cranking the engine
> 8
> times. Adding oil to the two low cylinders pushed thier compression up to
> 150 each. However, if I turn the engine over 13 times, without adding oil,
> the reading is 152, 149, 148 and 151. The engine runs fine, doesn't use
> oil
> or smoke and the plugs look normal. The engine only has 3000 miles since
> being freshened with new rings, bearings and valve springs. In a
> previous
> life the engine was fully rebuilt (including new pistons, valves etc) and
> run for only two races in a vintage Formula Ford. As it was originally
> fitted to a race car, it is a bit "loose" in specification. Therefore, the
> piston to bore size is a tad on the generous side but within factory
> allowances. I could probably borrow a leakdown tester to look into this
> further. Should I bother? Any thoughts or comments would be appreciated.
>
>
> Regards,
>
> John
>
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