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Re: Compression 150, 90, 75, 150 ....question (archive)

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Posted by M///Hard on June 25, 2001 at 18:23:31:

In Reply to: Compression 150, 90, 75, 150 ....question posted by Warren, Australia on June 25, 2001 at 17:57:23:

No matter what the head(at least)has to come off.Get on with it!You may even get lucky and have the head gasket blown between the two low cylinders.Would not be the first time.After the head is off you should be able to determine just what is up.A leak down test is good,but it's not gonna fix anything.It's obvious at this point the head at least has gotta come off.
... on a warmed-up open-throttle plugless engine. And besides being a daily driver with no oil loss, according to MacCartney these engines shouldn't work with a compression less than 100 PSI!

After a squirt of oil into the combust' chamber, pressures are 150, 95, 80, 150.

-leaking valves, leaking bores?

-Guess I'm looking at both a head and block rebuild.

-I'm thinking about just a head rebuild but am I wasting my time?


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