Hi all,
I've just preformed a cylinders compression test dry & wet. Does anyone know what the manufactures pressure should be? All my measurements for the four are between 50-60 psi.
Many thanks
Rodney
Rodney,
I don't know what the spec sheet calls for but 50 to 60 from a cold crank seems OK to me. This is what my car will also produce. The main thing is that it is relatively even across all cylinders. The range you stated is good in my book.
Chet...
Hi Chet
I understand that the compression is low on the Plymouth; I might have a go at work it out using a compression calculator.
I've dropped and cleaned the sump made a new gasket and the Plymouth is back on the road ready for it next weekend away in September, this time it's only a short 340mile trip. I took it out for a drive on the weekend and all going well.
Many thanks, Rodney
:)
Around 55 psi for me.
Swapping plugs out, what are the new ones to be gapped at?
Doug,
From the Plymouth instruction manual: see link on this site: http://www.1948plymouth.info/28Q29U/index.php?topic=122.0 (http://www.1948plymouth.info/28Q29U/index.php?topic=122.0)
"Spark Plugs
The gap between the spark plug points must be .027" to .030". Too wide a gap will cause misfire, especially at high speeds and when laboring with open throttle, while a small gap causes poor idling. Dirty or fouled spark plugs should be washed in gasoline. Uniform gap setting insures evenness of engine firing."
Chet...
Thanks Chet! I lost my reading glasses and cant read my manual. (New glasses Friday)
With the type of gas we use down here (98 octane) I set my gap at 030".
With clean plugs it runs fine at idle & at high speed.
Rodney