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#2246449 - 05/08/08 08:20 AM
Compession check before I buy
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Angler
Registered: 06/18/07
Posts: 494
Loc: Italy , Texas
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I'm looking at buying an 89 Evinrude 150. As long as the Compression is good on it, I'll buy it.
I'm a first time boat owner, so what do I look for to make sure the compression check is good?
About what should this engine read? and how much of a range do I allow? Is it ok to get a reading when the engine is cold? or does it have to be warmed up first?
Thanks, John
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John  
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#2246493 - 05/08/08 08:36 AM
Re: Compession check before I buy
[Re: 'Hachie]
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Extreme Angler
Registered: 06/12/03
Posts: 2744
Loc: Nacogdoches, TX
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"Being shot out of a cannon will always be better than being squeezed out of a tube. That's why God made fast motorcycles..." Hunter S. Thompson
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#2246999 - 05/08/08 10:45 AM
Re: Compession check before I buy
[Re: HasBen]
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Angler
Registered: 06/18/07
Posts: 494
Loc: Italy , Texas
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Thanks... So I guess somewhere between 90 and 100 are good numbers?
Does it have to be warm or can you get close enough with it cold?
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John
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#2247020 - 05/08/08 10:51 AM
Re: Compession check before I buy
[Re: 'Hachie]
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TFF Guru
Registered: 02/16/06
Posts: 14220
Loc: LA and TX
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Take it to North Texas fiberglass before you commit to buying it. Micheal will check it out for free....and give you a GOOD, fair assessment of it.
It's so much the compression itself , although important, but the difference in numbers from one hole to another.
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 The only easy day was....yesterday.
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#2247116 - 05/08/08 11:21 AM
Re: Compession check before I buy
[Re: Oldfrog]
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Extreme Angler
Registered: 02/09/03
Posts: 1403
Loc: Princeton, TX
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Take it to North Texas fiberglass before you commit to buying it. Micheal will check it out for free....and give you a GOOD, fair assessment of it.
It's so much the compression itself , although important, but the difference in numbers from one hole to another. I agree. Can't beat someone who knows what to look for and will do it for free. If the seller doesn't like the idea, run away.
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Ignorance and prejudice and fear walk hand in hand.
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#2247187 - 05/08/08 11:44 AM
Re: Compession check before I buy
[Re: anthonyhicks101]
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Extreme Angler
Registered: 12/15/03
Posts: 2642
Loc: Arlington, TX
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Cold engine generally tests lower. Ask the owner to warm it up, if he cranks it without hooking it up to the hose first, walk away.
Difference between cylinders is more important than actual readings - some say they should all be within 5% of the average with no more than 10% between lowest & highest - I wouldn't buy unless the lowest is within 5% of the highest. Maybe 7%.
johnnyrude V6's, look for neighborhood of 90lbs.
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 "The metric system never really caught on in the states. Unless you count the increasing popularity of the nine millimeter bullet." -- d. barry
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#2247534 - 05/08/08 01:20 PM
Re: Compession check before I buy
[Re: jtexas]
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Angler
Registered: 06/18/07
Posts: 494
Loc: Italy , Texas
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Jtexas... I was waiting for you to chime in. Thanks again... great information, as always!
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John
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#2247746 - 05/08/08 02:14 PM
Re: Compession check before I buy
[Re: 'Hachie]
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TFF Celebrity
Registered: 03/28/06
Posts: 5372
Loc: Waxahachie
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be sure and bring some muffs, I don't think he has any...
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Courage is being scared to death - but saddling up anyway. John Wayne  
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#2247808 - 05/08/08 02:37 PM
Re: Compession check before I buy
[Re: Poorboy]
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Angler
Registered: 06/18/07
Posts: 494
Loc: Italy , Texas
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Thanks PB... I'll bring 'em. Hope everything checks out good... I'll let you know.
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John
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