Thanks for the info Henry. Not that I know what the bore size
on my engine is but I wonder if your's is 87 mm and might that
not cause a slightly higher compression reading than say an
83 mm engine? More swept volume being compressed into the
same combustion chamber and such.
Also, do you know if you were getting any coolant into the
#4 cyninder? I seem to remember something about the steam or
cooling effect of the coolant loosening up carbon or something.
Drew
On Sep 23, 1:08pm, Henry Frye wrote:
> Subject: Re: TR3A compression numbers?
> drew@pixar.com wrote:
> >
> > Hi All,
> >
> > Last weekend I did a compression check on my TR3A and came up
> > with 160 lbs, 165, 148 160 for cylinders 1 thru 4. Except to
> > # 3 being a bit out of step with the others the numbers don't
> > seem too bad to me. What kind of numbers are other people seeing?
> >
>
> Drew,
>
> I did a compression test on my TR3B (TR4 engine) a few weeks before the
> head gasket blew, and I got 180, 175, 180, 160. I was concerned it was
> too high, indicating lots of carbon build up, but I got from a source I
> deem very reliable the 4 cylinder TR engines should run about 180 PSI.
> It sure made me feel good. But...
>
> Sure enough, the head gasket went on the #4 cylinder. When I pulled the
> head, I had no carbon accumulation to speak of, so my compression
> readings were pretty indicative of my impending problem.
>
> BTW, the #4 combustion chamber was _real_ clean, no carbon at all.
>
> I didn't do a leak-down test, but I thought about it. That might have
> given me a better handle on the about to blow head gasket.
>
> All this makes me think about why my head gasket blew. Those interested,
> look for my next post...
> --
> - - - - - - - - - - - - - - - - - - - - - - - - -
> Henry Frye E-mail - thefryes@iconn.net
> TR3B TCF1927 L http://www.iconn.net/thefryes/
> TR250 CD8096 L A Little Town In
> TR250 CD1074 L Connecticut, USA
>-- End of excerpt from Henry Frye
--
Drew Rogge
drew@pixar.com
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