What compression numbers for 4 stroke?

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Hugh
Posts: 265
Joined: Fri Mar 13, 2015 10:47 am
Location: Yerington, Nevada

What compression numbers for 4 stroke?

Postby Hugh » Sun Jul 16, 2017 10:31 pm

All my books are for older engines and I can't seem to find the info. 1996 15 Johnson 4 stroke. Just a good ballpark number as it was overheated a bit.

fleetwin
Posts: 1797
Joined: Mon Mar 09, 2015 4:27 pm
Location: Rhode Island

Re: What compression numbers for 4 stroke?

Postby fleetwin » Mon Jul 17, 2017 11:27 am

Good question for sure, don't know if OMC posted numbers for the four strokes. I don't think I have a four stroke book, but will check when I get back home...

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Garry in Tampa
Posts: 1880
Joined: Mon Mar 09, 2015 2:32 pm
Location: Florida

Re: What compression numbers for 4 stroke?

Postby Garry in Tampa » Mon Jul 17, 2017 1:40 pm

As far as I know, only Chrysler published compression figures. . . :D
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Jeff Register
Central Arizona Chapter President
Posts: 841
Joined: Wed Mar 11, 2015 7:19 pm
Location: Mesa, Arizona

Re: What compression numbers for 4 stroke?

Postby Jeff Register » Mon Jul 17, 2017 2:10 pm

Balance is a good starting point. What are your numbers?

Hugh
Posts: 265
Joined: Fri Mar 13, 2015 10:47 am
Location: Yerington, Nevada

Re: What compression numbers for 4 stroke?

Postby Hugh » Mon Jul 17, 2017 8:01 pm

I got 148 and 151 lbs on it so I am calling it good.

Jeff Register
Central Arizona Chapter President
Posts: 841
Joined: Wed Mar 11, 2015 7:19 pm
Location: Mesa, Arizona

Re: What compression numbers for 4 stroke?

Postby Jeff Register » Mon Jul 17, 2017 9:53 pm

Good enough to run.


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