why is my compression bad? :(

[rapieper@yahoo.com (Ron Pieper)]

135-140 on all cylinders is a cause for joy, because consistency between cylinders is the #1 thing
you look for in a compression check.  

Alan said you should have the TB open, he's right (also disconnect the boot from the TB).  Michael
said 10psi increase is not bad, he's right.  Daun said to run the engine hard to break the rings,
IMO he's right.  

What bugs me is the white exhaust - describe this more fully.  Billowy, lingering white?  if so,
that'd be coolant you're burning, which keeps your plugs shiny clean.  And uses coolant.  

If it's just a litle white smoke, ignore it for now.  Fill the crankcase with dino oil, run it
hard for a month or so, then see where you are.

AFA the low power, double check your cam and igniton timing, then your fuel mixture.

HTH

Ron

--- Robbie Cotner <robw_z@yahoo.com> wrote:
> 
> I ran a compression check on my JH 8v today, 135-140psi on all cylinders.  Adding some 80w-90 to
> the cylinders raised all readings ~10-12psi.  This thing was rebuilt 10k ago, immediately after
> the rebuild I had 150psi on all cylinders!?  I was hoping compression would increase once the
> rings got seated.  From what I've read 130psi is the minimum for JH's, I'm not happy.  Is this
> why my engine has such low power?  I really have babied this thing, never revved above 5k, I've
> changed the oil many times and am running synthetic 10w-30.  My exhaust smokes all the time, but
> the smoke is white as a ghost and I attributed it to the cold...  my spark plugs also show no
> indication of burning oil.  Any opinions on this?  Thanks in advance,
> 
> Rob

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