[DMCForum] Re: 155 psi compression readings
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[DMCForum] Re: 155 psi compression readings



I was getting 150-160 too using railroad's compression gauge. Had no
long extension (matches long spark plug threads) or O rings like new
ones at parts house, so I bought my own. That's when readings shot up
to 170 psi. 

Was worried I had warped valves too.

Bill Robertson
#5939

>--- In DMCForum@xxxxxxxxxxxxxxx, "Walter Coe" <Whalt@xxxx> wrote:
> > What kind of readings are other people getting?
> 
> I tested one engine while doing a valve adjustment.  This one had
53K miles
> and one valve that rattles.
> 
> Cylinder, PSI
> 1 = 155
> 2 = 145
> 3 = 157
> 4 = 121 (guess which one has the valve that rattles)
> 5 = 155
> 6 = 151
> 
> We checked this with the engine dry (i.e., didn't pour oil in the
spark plug
> holes.)
> 
> I don't think that oiling the engine will really give a true compression
> reading anyway.    I'm sure that enough thick oil could clog any
compression
> leak.
> 
> This was almost a year ago and the engine is still running fine (per
se) in
> a daily driver.
> 
> Walt



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