Robert,
I think your readings are caused by an optimistic gauge (and using too
much oil). But since
repeateability is more important than accuracy in this case, I would look
at the differences between cylinders. You have a little more than a 10%
spread dry and less wet. If you are happy with the engines performance
and general demeanor, I would change the rod bearings. Take a good look
at the crank surfaces. If they are scored, plan on a rebuild in the
future.
Ulix
On Sat, 14 Mar 1998, robert weeks wrote:
> Hello,
>
> I've been trying to decide whether to do a full rebuild on my engine
> or just replace the bearings and leave it at that for now. Unfortunately,
> I think Uncle Sam is going to want any spare cash I have come April 15th.
> So money is getting a little tight for a rebuild.
>
> I went and got a compression tester to see how the rings are and here
> are the results:
>
> cylinder #1 no oil 190lbs/psi oil 265lbs/psi
> #2 no oil 175lbs/psi oil 275lbs/psi
> #3 no oil 170lbs/psi oil 265lbs/psi
> #4 no oil 185lbs/psi oil 270lbs/psi
>
> This makes no sense to me as the Bently book says 120lbs/psi is the
> proper reading for the 1275 series A. I took all of the measurements
> twice and came up with the same thing both times.
>
> Does anyone have any insight to these readings? I'd appreciate any help
> I can get.
>
> TIA,
>
> Robert Weeks
> Durham NC
> 1969 Midget
> http://www.woozy.com/midget/
>
>
Ulix __/__,__
.......................................................... (_o____o_)....
'67 Sprite
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