1987 Chevy 350 TBI from Silverado

this engine has 91K miles on it and drinks oil like crazy! I just
can't figure it out. I have 26-29 lbs on the compression test. I have
replaced the valve seals. it is not dripping..... any ideas?

Regards,
Wit

26-29lbs of compression in each cylinder?! Are You *SURE* you tested
them correctly? That is incredibly low. An old trick is to try a few
squirts of oil into the cylinder before compression testing. If the
reading goes up, your rings are worn. If it doesn't, it is something
above such as valves, headgasket, ect.

However, if your compression is only at 26-29lbs, something is very
wrong. My guess is that (with such low compression) the rings are nearly
gone and oil is burning in the cylinders. Is blue/black smoke visible
out to tailpipes? Does it overheat? Do you loose coolant, too?


Carl


"Wit" > wrote in message
om...
> this engine has 91K miles on it and drinks oil like crazy! I just
> can't figure it out. I have 26-29 lbs on the compression test. I have
> replaced the valve seals. it is not dripping..... any ideas?
>
> Regards,
> Wit

"Carl Saiyed" > wrote in message >...
> 26-29lbs of compression in each cylinder?! Are You *SURE* you tested
> them correctly? That is incredibly low. An old trick is to try a few
> squirts of oil into the cylinder before compression testing. If the
> reading goes up, your rings are worn. If it doesn't, it is something
> above such as valves, headgasket, ect.
>
> However, if your compression is only at 26-29lbs, something is very
> wrong. My guess is that (with such low compression) the rings are nearly
> gone and oil is burning in the cylinders. Is blue/black smoke visible
> out to tailpipes? Does it overheat? Do you loose coolant, too?
>
>
> Carl
>
>
> "Wit" > wrote in message
> om...
> > this engine has 91K miles on it and drinks oil like crazy! I just
> > can't figure it out. I have 26-29 lbs on the compression test. I have
> > replaced the valve seals. it is not dripping..... any ideas?
> >
> > Regards,
> > Wit

I check with the local chevy dealership and they said anything greater
than 23 was ok. I do see black and blue smoke and I know I am burning
the oil. I tested the compression myself so I am pretty confident in
the #. Not overheating or loosing coolant. Just rotating through plugs
and oil.

ANy other thoughts?

Wit

Wierd.. I must be thinking of something different, as I recall you need
at least 60psi in each cylinder to run. My ol 76 Aspen had between
140-150psi in each cylinder.

What wt oil are you running?

Carl

"Wit" > wrote in message
om...
> "Carl Saiyed" > wrote in message
>...
> > 26-29lbs of compression in each cylinder?! Are You *SURE* you tested
> > them correctly? That is incredibly low. An old trick is to try a few
> > squirts of oil into the cylinder before compression testing. If the
> > reading goes up, your rings are worn. If it doesn't, it is something
> > above such as valves, headgasket, ect.
> >
> > However, if your compression is only at 26-29lbs, something is very
> > wrong. My guess is that (with such low compression) the rings are
nearly
> > gone and oil is burning in the cylinders. Is blue/black smoke
visible
> > out to tailpipes? Does it overheat? Do you loose coolant, too?
> >
> >
> > Carl
> >
> >
> > "Wit" > wrote in message
> > om...
> > > this engine has 91K miles on it and drinks oil like crazy! I just
> > > can't figure it out. I have 26-29 lbs on the compression test. I
have
> > > replaced the valve seals. it is not dripping..... any ideas?
> > >
> > > Regards,
> > > Wit
>
> I check with the local chevy dealership and they said anything greater
> than 23 was ok. I do see black and blue smoke and I know I am burning
> the oil. I tested the compression myself so I am pretty confident in
> the #. Not overheating or loosing coolant. Just rotating through plugs
> and oil.
>
> ANy other thoughts?
>
> Wit

with that low of comp in all cylinders it will not run ck your gauge i
work on these things back in 87 chevy had dude in factory that thought
his sh///t didnt stink built moters with the ring spacings lined up to
get atten had to over haul many new moters under warrenty from burning
oil you must have one they didnt catchthats why i drive ford