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Old 07-03-2013, 02:57 AM   #1
Join Date: Jun 2013
Posts: 12
2.5 compression numbers wanted

My TJ has done 90,000 miles.After a valve recut and a light skim to clean it up my compressions are 155-160psi per pot. i wondered what the standard compression numbers were as only other change is the removal of the snout from the front of the air box. since then, I'm getting 25mpg average on a tank which was better than expected.


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Old 07-03-2013, 09:55 AM   #2
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Location: Montgomery, AL
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Engine Type In-Line 4-Cylinder, OHV
Bore 98.4 mm (3.88 in.)
Stroke 81.0 mm (3.19 in.)
Displacement 2.5L (150 cu. in.)
Compression Ratio 9.1 : 1
Cylinder Compression Pressure 120-150 psi
Max. Pressure Variation 206 kPa (30 psi)
Torque 189 Nm (139 ft. lbs.) @ 3250 rpm
Firing Order 1-3-4-2

123 HP @ 5,250 rpm; 139 ft lb @ 3,250 rpm

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Old 07-03-2013, 11:27 PM   #3
Join Date: Jun 2013
Posts: 12
Well thanks for the data and I can see things are looking good for my old four banger then. I put some 33x10.5's on last night to try them for a week.

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