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Dec 30th, 2023
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 Compression question
#15262320
12/02/24 09:21 PM
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Joined: Feb 2002
Posts: 2,171
SoonerDG
OP
Extreme Angler
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OP
Extreme Angler
Joined: Feb 2002
Posts: 2,171 |
Looking at a champion boat that's a great price. the listing shows...
Mercury 200 did a compression test cylinders 1-4 are 120 psi cylinders 5&6 are at 112 psi
Is this a concern? I think i've heard that if the cyliders are within 10% then it's not an issue. But i'm not sure.
TIA!
"Life is a matter of luck and the odds of success are in no way enhanced by extreme caution." - Erich Topp, German U-boat Commander, 1943.
When in doubt, set the hook.
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Re: Compression question
[Re: SoonerDG]
#15262339
12/02/24 09:50 PM
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Joined: Dec 2008
Posts: 17,511
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 17,511 |
They probably didn’t even do the compression test properly to begin with. How much are they asking and what model?
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Re: Compression question
[Re: SoonerDG]
#15262380
12/02/24 10:20 PM
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Joined: Apr 2017
Posts: 14,257
tmd11111
TFF Guru
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TFF Guru
Joined: Apr 2017
Posts: 14,257 |
Those numbers wouldn't worry me at all. Run a can of power tune through it then do it again and I bet they get even closer.
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Re: Compression question
[Re: SoonerDG]
#15262599
12/03/24 04:42 AM
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Joined: Nov 2006
Posts: 2,933
TLW
Extreme Angler
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Extreme Angler
Joined: Nov 2006
Posts: 2,933 |
unless you have a "known proven" gauge its best to use more than one ta compare readings..........
not enough difference to be to concerned...
Last edited by TLW; 12/03/24 04:44 AM.
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Re: Compression question
[Re: SoonerDG]
#15262760
12/03/24 01:58 PM
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Joined: Jan 2005
Posts: 20,782
Pat Goff
TFF Guru
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TFF Guru
Joined: Jan 2005
Posts: 20,782 |
Yeah you want them all about the same. Compression test will show terminal cancer if you have 5 at 120 and one at 90 that’s a soon to be dead motor. But it won’t reveal a tired motor. That takes a leak down test. Which is hard to do standing on the driveway of the seller.
Pat Goff Seadrift TX ![[Linked Image]](https://i.ibb.co/X48Kbbq/scooter-shallow.jpg)
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