Compression Test Results a Concern? Options

[Alfafan]

Hi All,

I'm looking into the purchase of a '73 2.0L and have the car at a local specialist shop for a PPI.

The car has a recent engine rebuild with about 500 miles since. It runs well with the only exceptions that it surges and falls a bit at idle (I wasn't too concerned about that), but the compression test readings that were just relayed back to me are a concern.

The compression readings are 110, 110, 110 and 120psi.

Would these numbers be in the normal range for a fresh engine? They seem low to me. I'm waiting for a call from the mechanic with the particulars including confirming how the test was done (hot engine, thottle wide open, plugs out...etc?).

Assuming the test was done correctly, would these values point to a problem?

Is it possible that the engine is not fully broken in and the readings would be expected to rise?

Thanks for your help!

[Alfafan]

The shop did a second compression test yesterday and the numbers came up somewhat. The tech apparently didn't have the throttle wide open when first done. The new numbers are 115, 120,125, 125.

I had a long conversation about the engine with the mechanic that worked on it. I learned that the engine was sent out for rebuild to FAT Performance here in SoCal. The install and rest of the refurbishment was done at the shop. The engine apparently has a hotter cam and various other upgrades that I'll learn more about. The engine may not be fully broken in yet and according to the mechanic, could probably use a valve adjustment. If I understand correctly, the build and cam may have something to do with it as well.

It really goes though, running very strong with no smoke. I'm feeling better about the engine. The rest of the car is in great condition. The car is dry with no signs of rust. Excellent body, paint, and interior. It could use front tie rods and an alignment. That's about it. Looks like a keeper.

I've owned a bunch of Alfa Romeo's through the years but this is my very first Porsche. There's a smoothness to the Alfa on the road and in the way the engine loves to rev. The 914 compared to that is all business, low, balanced and connected. What a blast to drive! I'm really going to enjoy this and the community here on the forum.

Thanks again for all your help!