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Compression test numbers seem high? 1800

posted by  erik1463 on  Tue Aug 8 11:09 CST 2017
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Just a shout out for an opinion on how high my compression test numbers seem to be on my mostly stock spec 65' B18B engine. I rebuilt the engine a few years back and did all the compression math , CC'd the head and all that good stuff and should be in the 9.8 to 1 range on compression ratio. My compression test numbers are 215-218 PSI across all cylinders, i did the test properly with all the plugs out and throttle wide open. Redid the test with two different gauges and got same results. Numbers seem a little high, yes? Engine runs great, very strong but i do have a dieseling issue at shutdown which after many, many hours tuning I can only prevent by idling on the fast idle cam and then tossing the choke knob in to lower idle to near stalling and then shut off. Which is fine just a quirk i guess. So any thoughts on the high numbers? Again stock C cam, SU's and dual outlet exhaust manifold, nothing fancy.
Thanks!






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