AHHHHH!!!!!!!!!!
that is how you do it
you are recompressing already compressed air. in that case you can do it. i
never did a compression test and i thought you only cranked it once. when
you r driving, all that the engine will compress to will be the theoretical
value(about 135-140 psi) in that case you won't lose any power if you start
out with 160 psi and drop to 145 psi cus no air will squeeze past the rings
at either the engine with 160 psi or 145 psi. it doesn't leak until the
pressure reackes the measured pressure and when you drive it won't go over
140. therefore 140 psi is great and will run as good as an engine with
200+psi
----------
> From: Robert Lee Cobb Jr. <S0042745@cedarnet.cedarville.edu>
> To: dakota@ait.fredonia.edu
> Subject: Re: COMPRESSION TEST -Reply -Reply
> Date: Wednesday, February 19, 1997 8:05 PM
>
> > How the He** does someone get 160 psi from 9.1:1 compresion?
>
> I don't know WHY I got it, but I know the guage is fine and I got 160
> on 2 different cylinders. NOTHING was below 145. I used the formula
> the guy posted about the 29.921 inches mercury = 14.696 psi, and
> calculated what it would be at 30 inches mercury (what it hovers
> around usually here in the Buckeye state where I live). . and I came
> up with a CR of 10.18 using 150 psi average of the cylinders. Let me
> ask you guys this. . .has anybody else DONE a compression check on
> their motor? If you have and you got less than 130, let me ask you
> this: How many times did you turn the motor over when you checked
> it? I got 150 average by cranking the motor over about 4 complete
> firing series (about 6 seconds worth of cranking). If you only crank
> the motor over once, you loose some of your compression in the
> guage's rubber hose (the volume of the cylinder is theoretically
> increased by the volume of the rubber hose which it now has to fill
> up, too). What you have to do is keep on cranking the motor until
> you get the maximum amount of pressure in the thing that it will
> take. Do this: Have a buddy hold the pressure guage and you get in
> the truck and hit the starter (Oh yeah, remove the coil wire first).
> Now, explain to your buddy to not tell you to QUIT cranking it over
> until the needle won't go any higher. I imagine you guys would get
> around the same numbers as me. Otherwise, I'm running a heck of a
> lot more compression than I should be. I have no problem with
> pinging, either, on 87 octane. Anyway, let's here some numbers. . .
>
> - Rob Cobb 93 V8 LE 2wd
>
> >>> <DesignTech@worldnet.att.net> 2/19/97, 11:20am >>>
> yes, some air squeezes by and that is why you can't get the maximum
> psi...
> right?
>
> how the hell does someone get 160 psi from 9.1:1 CR?
>
> ----------
> > From: Kukukooter@aol.com
> > To: dakota@ait.fredonia.edu
> > Subject: Re: COMPRESSION TEST -Reply
> > Date: Wednesday, February 19, 1997 12:12 AM
> >
> > I believe you are measuring the cylinders pressure held by the
> rings
> using
> > the gauge, which is different than knowing your compresson ratio...
> > Kuk
>
>
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