Re: Compression follow up

["Dean W. Cains" <dwc@domain.elided>]

Hi Group:

Do those numbers sound right, taken in a garage, rather than in a 
hyperbaric chamber?  I ask because I checked the compression in my '74 
Spider a few weeks ago and got 155 all the way across, and I thought those 
numbers might even be a bit high.  Taken in an area with 14.7 psi as 
atmospheric pressure, what should compression be, with 9:1 pistons? with 
10:1?  I know cam profiles should matter, too, but how much?  Anyone out 
there care to give us a quick lesson?  Thanks.

Regards,

Dean


At 05:22 PM 11/8/2002, you wrote:

> Date: Fri, 08 Nov 2002 14:46:47 -0500
> From: "Heikki Rinta-Koski" <hrk951@domain.elided>
> Subject: Compression followup
>
> Thanks for the advice, Alfisti
>
> I asked about compression and I had 90-120-120-150 previously. When Oil was
> added the first came up to 150 range.
>
> Following the advice on this list I added Marvel Mystery oil to warm engine
> from plug holes and let it stand overnight. Drove around a little more and
> measured compression again.
> 190-190-193-195 Great!
>
> Thanks again
>
> Heikki Rinta-Koski
> - -76 Alfa Romeo Spider
> - -86 944 Turbo
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