Compression worries

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May 10, 2006 | 10:24 AM

Snowking

Thread Starter

Lead Driver

Joined: Jan 2006

Posts: 8,423

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From: Colonsay Sk. Canada

Compression worries

The 352 I just got going was sitting for a long time. It wasn't seized, but for a while the starter motor had all it wanted. I had to keep squirting oil into the cylinders but eventually she started to turn smoothly. The longest I have had it running would be about twenty minutes. I just did a compression test.

I had three pistons test 75's
two just under 75
one at 50
two at a dissapointing 10

How much may these improve if any? What can I do other then ripping it apart and start from scratch?

It may have been ran hot in the past I bught it with a leaking water pump and a temp. guage not working.

I think if I could get them all up to 75 I'd be happy, but of course i'd appreciate higher.

May 10, 2006 | 11:28 AM

PROSTOCK

Cargo Master

Joined: Feb 2004

Posts: 2,051

Likes: 166

From: Central Texas

75 sounds awfully low I'm afraid. It could be the rings are stuck. If you had rust in the cylinders then you probably are looking at tearing it down.

May 10, 2006 | 02:08 PM

rusty70f100

Post Fiend

Joined: Jan 2003

Posts: 8,600

Likes: 4

From: Iowa

I'd say go drive it a while, long enough to get the motor warm, and see if the rings will work themselves back in again. Then do another compression test.