[V8] compresion testing

[dsaad at icehouse.net]

My compression numbers are more like 130-145 PSI - but that may have a lot to do
with guage quality, elevation, etc. Or my motor could just be worn out and I can
not admit it to myself...

I too have high oil consumption - but I just did the magic "GM Top Engine
Cleaner" trick and it seems my oil consumption is now well over 1000 miles /
quart, where it was well below 1000/qt before.

When it gets down to 600 or 700 mi/qt I do the cleaner job and it jumps right
back up. My theory is that as oil usage goes up, so does carbon build up and
then a vicious circle of more burned oil and more carbon.
My motor has done this for as long as I have had it - which started at just
under 90K miles as indicated on the odo. I might add that this car rarely goes
over 45 MPH.

There are lots of places that will do this de-carbon engine cleaning for you for
around $100. It is kind of a PITA to do yourself - and there is a mandatory oil
change right afterwards.
Plus the pros have special machine that also cleans up the injectors at the same
time. I think it is called "MotoVac" at the shop I go to.


Also, while I aint no pro mechanic, I would fully expect the wet pressures to go
up some.
Too much would of course mean bad rings, but I guess the million dollar question
 is how much is normal.

What kind of guage are you using?


Dave


Quoting quattro <allanvega at adelphia.net>:

> Are you sure about that? I was lead to believe by others that if the wet
> numbers jumped up like that, that it was a sighn of bad rings.I really hope
> that isnt the case.......but i am using a quart of oil evey tank full of
> gass. Was hoping  a few of the big wigs would chime in here. Thanks
> ----- Original Message -----
> From: "Kent McLean" <kentmclean at mindspring.com>
> To: "quattro" <allanvega at adelphia.net>
> Cc: <v8 at audifans.com>
> Sent: Sunday, April 24, 2005 8:57 PM
> Subject: Re: [V8] compresion testing
>
>
> > quattro wrote:
> > > well Iv got some  compression numbers
> > >
> > > left bank  |   right bank
> > > dry | wet  | dry | wet
> > > ------------------------
> > > 195|200   |215|257
> > > 215|235   |205|225
> > > 215|227   |215|231
> > > 225|260   |210|241
> > >
> > > So what do you guys make of these nubers?
> >
> > I'm no expert, but I'd be happy with them. The dry numbers
> > are close to each other (within 10%), and the wet numbers
> > show an increase, which should be expected. Some show a
> > bigger increase than others, but I don't think it shows
> > there is a major problem.
> >
> > --
> > Kent McLean
> > '94 100 S Avant, "Moody"
> > '89 200 TQ, "Bad Puppy" up in smoke
> > '56 Austin-Healey 100 BN2, for sale
> >
>
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