What the compression should be on 3.5L or 3.9L?
#1
09-07-2011, 10:44 AM
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What the compression should be on 3.5L or 3.9L?
Hello.
I got recently "parts 1991 Rover" Runs, but no muffler and plates, so I can't drive it on the road. It has a 3.9L motor. Would you know what the compression on 3.5L ( that's what I have now) and 3.9L should be in case I need to swap engines in the future?
Thank you for input.
I got recently "parts 1991 Rover" Runs, but no muffler and plates, so I can't drive it on the road. It has a 3.9L motor. Would you know what the compression on 3.5L ( that's what I have now) and 3.9L should be in case I need to swap engines in the future?
Thank you for input.
#2
09-07-2011, 11:22 AM
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#3
09-14-2011, 02:10 PM
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#4
09-14-2011, 03:09 PM
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From the RAVE shop manual for the 4.0, should be close (older engines are usually off quite a bit in one or more cylinders):
9.35:1 = 11.5-12.2 bar, 170-180lbf/in2
CYLINDER COMPRESSION - TEST
Equipment:
Compression pressure gauge
Test
1.
Equipment:
Compression pressure gauge
Test
1.
Start and run engine until normal engine
operating temperature is achieved (thermostat
open).
operating temperature is achieved (thermostat
open).
2.
Remove all spark plugs.
3.
Disconnect both coil negative (WB) leads
4.
Insert compression gauge, crank engine until
reading stabilises.
reading stabilises.
5.
Expected readings, throttle fully open, battery
fully charged:
8.31:1 = 10.2-10.9 bar, 150-160lbf/in2
fully charged:
8.31:1 = 10.2-10.9 bar, 150-160lbf/in2
9.35:1 = 11.5-12.2 bar, 170-180lbf/in2
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