David Carment says: > > bentley sez: > > > > for air-cooled vanagon engines: > > nominal ........... 85-131 psi > > minimum ........... 73 psi > > max diff .......... 44 psi between any two cylinders > These figures do not seem to be supported by fact. The engine I have has a > compression ratio of 145 psi(air-cooled). The engine that I junked had > cylinders with a compression ratio of 90, 110, 120 and 110 and ran poorly. > A difference of 44 psi seems far too great, usually 10 % is the norm...DC My '78 ran for years with compression in the range 90-115, and ran reasonably well. Three years ago it started getting worse (at about 110kmiles) and cylinder two dropped to ~75psi. It still ran ok, but I had trouble passing emissions (high hydrocarbons). Then last year (at 125kmiles) it dropped to ~50psi; still ran reasonably, but there was no way to pass emissions. So, I retired it to chicken coop status until I can yank and rebuild. Anyway, it was leaking a lot of oil from the oil cooler. Rich Richard Lamoreaux lumpy@rtd.com '78 Chicken Coop '87 Weekender
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