Rick Lindsay wrote:
> Hello Gang,
> I did the compression test on a hot engine and here
> is what I found:
>
> Cyl. Dry Wet
> -----+--------+-------
> 1 130 psi 136 psi
> 2 105 psi 110 psi
> 3 130 psi 136 psi
> 4 130 psi 135 psi
>
> Interpretation:
>
> Bottom end good, top end bad on cylinder #2. This car
> has not been driven in many months but that's not
> enough lack of use to account for the #2 pressure
> drop. What this tells me is that the head needs a
> valve job.
>
> So it sounds like I now have a little more
> mechanic-work before the winter is out. I'd better go
> now. I have a workplan to build. Okay, I have to
> admit. I look forward to this work. I like the
> precision of seating then adjusting valves.
>
> regards,
>
> rick
> '70 MGB Tourer with an ill 18GB engine. :-)
You probably were already aware of this, but just in case: I always set the
valve clearances before doing a compression test. I have done this ever since I
removed a head unnecessarily on a Mini in 1964. The cylinder I thought had a
bad valve actually had the clearances set too tight on one valve (I assume),
since, when I got the head off, all the valves were in fine shape.
-The Roxter
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