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Compression test results- Thoughts? #11392088 02/04/16 08:50 PM
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Jersey Dan Offline OP
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Have a buddy who is thinking about purchasing a boat. What are your thoughts on the following compression readings?

95
97
105
105
97
90

Moritz Chevrolet - 9101 Camp Bowie W Blvd, Fort Worth, TX - Monte Coon (817) 696-2003
Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392095 02/04/16 08:54 PM
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snickers Offline
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how old and what motor

Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392104 02/04/16 08:57 PM
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Brandon Dickenson Offline
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They say to have all cylinders within 10-15%. I suppose he should be ok, but I hope he knows going in that it can blow any minute.

Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392113 02/04/16 08:59 PM
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bradnitro175 Offline
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Test drive it then test it again bet it goes up.if not I'd pass


Originally Posted by Trickster
BIG FAT BASS LIVES MATTER


Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392152 02/04/16 09:10 PM
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JIM SR. Offline
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if it was an old straight 6 I'd say it had a warped head,..who knows.
22% difference in 105 to 90,...age and hours is always a factor..
and who done the test,..??

Re: Compression test results- Thoughts? [Re: snickers] #11392194 02/04/16 09:25 PM
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Jersey Dan Offline OP
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Originally Posted By: snickers
how old and what motor


225 optimax w/ 700 hours.

Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392203 02/04/16 09:29 PM
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bogey♂ Offline
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Is there a scale in said boat?


Originally Posted By: Dan90210 ☮
you know, nothing wrong with seven men who met on the internet going for a swim together
Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392223 02/04/16 09:34 PM
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DKennimer Offline
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I would be a little hesitant with the cyl showing 90 (assuming it's a quality guage being used)... Definitely get a leak down test done!! That's the only real way to find out the motors "health".

Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392227 02/04/16 09:36 PM
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Fast Lane Offline
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Should be in the 110-119 psi range.

Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392286 02/04/16 09:53 PM
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bossman Offline
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Since you are asking, there must be some concern about that engine. Don't buy a boat you have "some" concern about. Once it blows, you knew better to begin with. But with that said, there are two types of engines...1) those that are blown, 2) those that are gunna blow.

Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392302 02/04/16 09:59 PM
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gary purdy Offline
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I would buy it with the intent of freshening the motor.


The world will not be destroyed by those who do evil, but by those who watch them without doing anything. Remember what He has done and remember that He is not done yet!-- GOD IS GOOD
Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392339 02/04/16 10:10 PM
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Have him run it by a dealer for a leak down test. Often there is a ton of variance between compression gauge sets. The leak down being more accurate. Its cheap insurance. Spend $100 now to save $4000-10,000 later.

Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392465 02/04/16 10:59 PM
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Frank the Tank Offline
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^^^^^ yep... And if those are the right numbers, I'm not buying that boat. That motor I headed for a rebuild.

Last edited by Frank the Tank; 02/04/16 11:18 PM.

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Re: Compression test results- Thoughts? [Re: Mark Perry] #11392494 02/04/16 11:11 PM
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Originally Posted By: Mark Perry
Have him run it by a dealer for a leak down test. Often there is a ton of variance between compression gauge sets. The leak down being more accurate. Its cheap insurance. Spend $100 now to save $4000-10,000 later.


this. plus 700 hours is a lot, but i had one that i sold with 932 and its still running to this day and he has around 1135 on it now. maintenance and service records


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Fishing Texas lakes one at a time






Re: Compression test results- Thoughts? [Re: Jersey Dan] #11392626 02/05/16 12:13 AM
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Yep...leakdown test...5 to 8% leakdown at max, anymore, I would reduce my offer substantially to compensate for freshening up.

Gman

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