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Ozarkred
 Post subject: compresion 4 cyl
PostPosted: Mon Jun 25, 2012 9:35 am 
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Joined: Mon Jan 24, 2011 11:56 am
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Location: Seligman, Missouri
I am doing a 215,000 mile check up, in, around. What is the proper compression for the 4 cylinder engine. And, thank you, in advance, for the assistance.
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bamaland101
 Post subject: Re: compresion 4 cyl
PostPosted: Mon Jun 25, 2012 10:33 am 
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Posts: 46
Book says engine series 1-4 should be 160-163
Series 5-12 should be 165-170
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oldestisuzuist
 Post subject: Re: compresion 4 cyl
PostPosted: Mon Jun 25, 2012 7:53 pm 
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That's for a new engine, at 215,000 it will be less. Whatever it is it should be within 10psi high to low in all four.

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bamaland101
 Post subject: Re: compresion 4 cyl
PostPosted: Mon Jun 25, 2012 9:38 pm 
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Yes Thats true but that's why I put about a 5psi difference but 10 lower is good too..
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Ozarkred
 Post subject: Re: compresion 4 cyl
PostPosted: Tue Jun 26, 2012 8:32 am 
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Location: Seligman, Missouri
Guys,
This really does mess with my head! The truck runs great, uses no oil, gets about 25-28 miles per gallon, and seems to have plenty of power. However, the test showed compression at about 60 on the outside, and 40 on the inside. We are going to get a different tester, just to confirm the low pressure.
Ideas?
thanks,
Ozarkred[/size][/i]
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luvhateluv
 Post subject: Re: compresion 4 cyl
PostPosted: Wed Jun 27, 2012 10:38 pm 
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Posts: 296
Location: Eugene, Oregon
That seems really low,I just tested mine,I don'tknow the mileage,5 digit odometer :econfused but mine came up 145 155.

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bamaland101
 Post subject: Re: compresion 4 cyl
PostPosted: Wed Jun 27, 2012 10:43 pm 
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Tested mine today too.. 168,167,167,168 guess I'm doing pretty darn good :)
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egg
 Post subject: Re: compresion 4 cyl
PostPosted: Thu Jun 28, 2012 12:23 am 
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Joined: Sun May 15, 2005 4:57 pm
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Location: Cornelius Ore
Ozarkred wrote:
Guys,
This really does mess with my head! The truck runs great, uses no oil, gets about 25-28 miles per gallon, and seems to have plenty of power. However, the test showed compression at about 60 on the outside, and 40 on the inside. We are going to get a different tester, just to confirm the low pressure.
Ideas?
thanks,
Ozarkred[/size][/i]


Ya doin it correctly? Throttle wide open?
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Ozarkred
 Post subject: Re: compresion 4 cyl
PostPosted: Thu Jun 28, 2012 9:39 am 
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Location: Seligman, Missouri
Ah, ha! No, just at idle speed. Thanks.
Ozarkred
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oldestisuzuist
 Post subject: Re: compresion 4 cyl
PostPosted: Thu Jun 28, 2012 10:46 am 
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I hope you meant cranking speed, not idle speed.
Test each cylinder with the throttle wide open, normal cranking speed for 3-8 seconds, all spark plugs removed. Then repeat with a couple teaspoonsful of motor oil into each plug hole, see if there is a significant increase over dry.

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'87 Trooper,2.3,5sp,headers,31's,ball joint flip & spacer,Aussie Locker rear,Superwinch hubs,brush guard w/5.5K winch,more to come.
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egg
 Post subject: Re: compresion 4 cyl
PostPosted: Thu Jun 28, 2012 11:37 am 
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Location: Cornelius Ore
oldestisuzuist wrote:
I hope you meant cranking speed, not idle speed.
Test each cylinder with the throttle wide open, normal cranking speed for 3-8 seconds, all spark plugs removed. Then repeat with a couple teaspoonsful of motor oil into each plug hole, see if there is a significant increase over dry.


Correct, oil will always make a difference and raise the compression because of the additional room it takes up in the combustion chamber. But--it should not make a major difference in a good engine.
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cleaver
 Post subject: Re: compresion 4 cyl
PostPosted: Tue Jul 10, 2012 8:37 pm 
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da LUV masta

Joined: Wed Jun 09, 2010 12:22 pm
Posts: 550
Location: Redfield SD
If the rings are bad and the valves are bad you will have a drastically lower compression test.
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Ozarkred
 Post subject: Re: compresion 4 cyl
PostPosted: Wed Jul 11, 2012 6:21 am 
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Joined: Mon Jan 24, 2011 11:56 am
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Location: Seligman, Missouri
thank you.
Ozarkred
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