<VV> Corvair compression readings

[Mark Durham]

Regardless, the key is consistency in readings from one cylinder to
another.  I'm at 2100 feet, so I would not even get the 14.7.
That's only at sea level on a standard day!
I know my heads were off because the spark plug holes were welded shut and
re-drilled slightly closer to the exhaust valve and I have modern style
tapered seat spark plugs. Who knows what they did in there? I'll know later
this year because I've decided its time to do a thorough overhaul (and other
things, maybe EFI) to this 48 year old motor. So, I'm saving my pennies.
Mark Durham

On Fri, Mar 5, 2010 at 8:36 AM, Clark Hartzel <chartzel at comcast.net> wrote:

> I have seen readings in the 150/155 pounds range on a 110/140 HP engine.
> But atmospheric pressure is 14.7 PSI x 9.25 compression ratio = 136
> pounds.
> I think we all have inaccurate gauges!  I can't see any stock Corvair
> engine having more than 136 pounds compression and that assumes you have
> no leaks thru the valves or ring gaps and both valves are closed at the
> start of the compression stroke.  Race engines are a different story
> with higher compression ratios.
> Clark Hartzel
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