Scott,
130 - 150 sounds about normal for a good running HE engine. The 110 on
#2 sounds like an exhaust valve beginning to burn, especially since the
reading holds up when wet. #2 and #3 tend to burn... Surprised your #3
is higher than #1, but I'd bet that will change in a couple 1000 miles.
Those SU's aren't worth anything to you without the Spitfire head, so
why don't you send them up here? Please include the manifolds!
b
Scott A. Roberts wrote:
> Ok Guys,
> Here's a little question for you. I just got the engine running tonight, for
> the first time in a number of years, and decided to do an unloaded compression
> test(all 4 plugs out)
>
> My readings were, front to back (1-4) 130/110/150/150 Number two seemed low,
> and 3&4 seemed high. I wet tested #2, and there was no change.
>
> My engine is a GD 1250 Herald engine, I am unsure of the exact bore- stock or
> rebore I don't know.
>
> Could the difference be caused by the lack of run time, and will level or
> improve with use? I also wonder if it could be the valves need looking into- I
> just adjusted them, though they were pretty close on exact. (I only needed to
> adjust about three out of the eight)
>
>
> Any thoughts or suggestions would be appreciated.
>
> Scott
> 64 Herald 1200 Convertible what goes putt now
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