Question about my compression numbers - Alfa Romeo Bulletin Board & Forums
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post #1 of 2 (permalink) Old 11-08-2018, 02:18 PM Thread Starter
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Location: Penn Valley, CA
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Question about my compression numbers

New Spider to me. 1988 Veloce. 55,00 miles. I know very little of its history but PO had headers installed that were changed out for smog test. They have been re-installed. It also came with Koni yellows and appears to have stiffer/lower springs.

This is my 5th Alfa, and I've never had one that had this much torque. My first was a new '74 Spider, so my memory has faded, but I don't think it made power like this one!

Without doing a teardown, I am wondering if there was engine work done. I ran a warm dry compression test today (3 passes) and got a consistent 200 lbs. even in all four cylinders.

Does that seem like a normal number? Seems high to me, which is a GOOD thing!!!

Keeth Lawrence
1988 Spider Veloce
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post #2 of 2 (permalink) Old 11-08-2018, 03:55 PM
Richard Jemison
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Join Date: Apr 2005
Location: Pensacola, Fl. U.S.A.
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That`s higher than a typical 10 to 1 motor. But remember with the intake cam retarded as it is, overlap is severely reduced and the exhaust cam is a faster ramp design than earlier versions again reducing overlap compression losses.

Measure from the top of the #1 spark plug hole to the piston top at TDC and ask another Series 4 Motronic engine owner to do the same and compare.

You probably have a well sealed engine. That`s good!

Richard Jemison
RJR Racing

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