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Max Online: 36273 @ 01/23/13 02:34 PM
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#11392088 - 02/04/16 02:50 PM Compression test results- Thoughts?
Jersey Dan Offline
Guido

Registered: 01/01/07
Posts: 6399
Loc: your sisters house
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

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#11392095 - 02/04/16 02:54 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
snickers Offline
TFF Team Angler

Registered: 05/08/09
Posts: 3651
how old and what motor

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#11392104 - 02/04/16 02:57 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
Brandon Dickenson Offline
TFF Team Angler

Registered: 09/01/04
Posts: 4317
Loc: Conroe
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.

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#11392113 - 02/04/16 02:59 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
bradnitro175 Online   content
TFF Team Angler

Registered: 07/11/08
Posts: 3889
Loc: Dallas,tx
Test drive it then test it again bet it goes up.if not I'd pass

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#11392152 - 02/04/16 03:10 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
JIM SR. Online   sick
TFF Celebrity

Registered: 09/25/06
Posts: 6261
Loc: NRH/Fork again ! GET THE NET
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,..??

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#11392194 - 02/04/16 03:25 PM Re: Compression test results- Thoughts? [Re: snickers]
Jersey Dan Offline
Guido

Registered: 01/01/07
Posts: 6399
Loc: your sisters house
Originally Posted By: snickers
how old and what motor


225 optimax w/ 700 hours.

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#11392203 - 02/04/16 03:29 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
bogey Offline
TFF Guru

Registered: 02/21/08
Posts: 14650
Loc: plano
Is there a scale in said boat?
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#11392223 - 02/04/16 03:34 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
DKennimer Offline
Extreme Angler

Registered: 03/01/10
Posts: 2793
Loc: Plano/Fork
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".
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#11392227 - 02/04/16 03:36 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
Fast Lane Offline
TFF Celebrity

Registered: 07/24/06
Posts: 5679
Loc: Tyler, texas
Should be in the 110-119 psi range.

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#11392286 - 02/04/16 03:53 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
bossman Offline
Outdoorsman

Registered: 07/22/02
Posts: 125
Loc: winnsboro,tx, usa
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.

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#11392302 - 02/04/16 03:59 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10655
Loc: Littlefield Tx & Lake A. H. US...
I would buy it with the intent of freshening the motor.
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#11392339 - 02/04/16 04:10 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
Mark Perry Online   content


Registered: 01/09/04
Posts: 48931
Loc: Point Reyes
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.
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#11392465 - 02/04/16 04:59 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
Frank the Tank Online   content
TFF Guru

Registered: 02/27/13
Posts: 18415
Loc: Rockwall & a lake somewhere
^^^^^ yep... And if those are the right numbers, I'm not buying that boat. That motor I headed for a rebuild.


Edited by Frank the Tank (02/04/16 05:18 PM)
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#11392494 - 02/04/16 05:11 PM Re: Compression test results- Thoughts? [Re: Mark Perry]
Bruce's Guide Service Online   content
TFF Team Angler

Registered: 09/04/03
Posts: 3666
Loc: southlake
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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#11392626 - 02/04/16 06:13 PM Re: Compression test results- Thoughts? [Re: Jersey Dan]
Gamblinman Online   content
Extreme Angler

Registered: 11/26/02
Posts: 2150
Loc: Yantis, TX
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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