My Compression Test Results
04-25-2011, 02:42 PM
#28
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2003 W211 E55, 2003 W220 S600
190mm, Eurocharged tune, Grinded 74mm TB, 3 inch exhaust x pipe, modified stock headers, 3" ceramic cats, TTM fuel rail and 550cc injectors, heat exchanger, meziere pump.
04-25-2011, 03:00 PM
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2003 W211 E55, 2003 W220 S600
I have a MB 82mm sitting eventually i will put it on. i have installed a couple of 82mm kits on other E55s.
04-25-2011, 03:09 PM
#32
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i have been reading on the Kennebell website they say a 74mm is good for about 600 rwhp before it becomes a restriction. I really want to attach a gauge to see how much vaccum a 74mm is pulling as compared to a 82mm in 3 gear on a dyno pull.
I have a MB 82mm sitting eventually i will put it on. i have installed a couple of 82mm kits on other E55s.
I have a MB 82mm sitting eventually i will put it on. i have installed a couple of 82mm kits on other E55s.
04-25-2011, 05:02 PM
#34
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On second thoughts Shardul...those compression results look awful...I'll give you $50 for the car to make your life stress-less, that way you have more time in Whole Foods checking out senoritas
04-27-2011, 03:37 PM
#36
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Here are mine, test result of all 8 cylinders.
All are in between 10 and 10,4 bar which equals 145 to 150psi i guess.
The engine was not in operating temperature, this means that in operation temp. the pressure is slightly higher
All are in between 10 and 10,4 bar which equals 145 to 150psi i guess.
The engine was not in operating temperature, this means that in operation temp. the pressure is slightly higher
04-27-2011, 09:25 PM
#37
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05 ML-500 , 03 CLK5.5 AMG has left the Garage
Flow benched a 82 MM T-body
Last Saturday I had some time to stick a 82 MM T-body on the flow bench.
It Flowed 930 CFM. Then I installed the Y from a 80 MM set up. It Drop to 850 CFM. That is a 80 CFM drop? I'm looking to install this type of set up on my klee blower. I need to do more fabrication. If I was shipped a stock 74 mm , I would flow it for comparison against one with a Shaft grind done by (NOT ME) enough interest we will start a new thread
Cheers _PTEngineering
It Flowed 930 CFM. Then I installed the Y from a 80 MM set up. It Drop to 850 CFM. That is a 80 CFM drop? I'm looking to install this type of set up on my klee blower. I need to do more fabrication. If I was shipped a stock 74 mm , I would flow it for comparison against one with a Shaft grind done by (NOT ME) enough interest we will start a new thread
Cheers _PTEngineering
Last edited by PTE; 04-27-2011 at 09:42 PM.
04-30-2011, 02:57 AM
#43
Any higher then that (with consistant results between cyl.)on high millage 55k engine means unrealistic readings (wrong measuring approach or wrong meassuring device or both) or in the case of unconsistency between cylinders-heavy carbon build up. That are my experiences and words of my friend which is for last 20 years main mechanic in mercedes shop here in Europe.
12-15-2014, 03:45 PM
#44
Since I am running a bigger pulley and have other mods I figured I would do a compression test on my car. After doing this I think this is a must for all the heavily modded cars. Exotic-Metal55 was kind enough to lend me his compression testing set.
Here are the results. WIS say the compression number should be within 22 psi of each cylinder which I think is too much.
It is a pretty straight forward procedure, just remember to disconnect the CPS which doing this test so this will prevent the engine from starting.
Cylinder 1 161
Cylinder 2 155
Cylinder 3 160
Cylinder 4 160
Cylinder 5 161
Cylinder 6 160
Cylinder 7 161
Cylinder 8 160
If anyone has done this please can you share your results. Does anyone know what the compression results should be on a 55k motor?
Here are the results. WIS say the compression number should be within 22 psi of each cylinder which I think is too much.
It is a pretty straight forward procedure, just remember to disconnect the CPS which doing this test so this will prevent the engine from starting.
Cylinder 1 161
Cylinder 2 155
Cylinder 3 160
Cylinder 4 160
Cylinder 5 161
Cylinder 6 160
Cylinder 7 161
Cylinder 8 160
If anyone has done this please can you share your results. Does anyone know what the compression results should be on a 55k motor?
Cylinder 1 162
Cylinder 2 162
Cylinder 3 162
Cylinder 4 162
Cylinder 5 162
Cylinder 6 165
Cylinder 7 163
Cylinder 8 163
12-15-2014, 05:28 PM
#45
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Mine were all in 130 ish,however my guage may be bad,or camshaft might bleed off a little who knows,car ran in the tens I'm not worried
12-15-2014, 05:37 PM
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12-15-2014, 11:04 PM
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W211 E55 Wagon, E46 M3
Here's my compression and leak down numbers when the car was at 18k miles done by MB dealer from previous (1st) owner as documented from the copy of the service record I got when I bought the car from them.
Compression test result:
C1 175psi
C2 175
C3 175
C4 175
C5 170
C6 175
C7 175
C8 170
Leak down test result:
C1 3%
C2 3%
C3 3%
C4 3%
C5 3%
C6 0%
C7 3%
C8 3%
Compression test result:
C1 175psi
C2 175
C3 175
C4 175
C5 170
C6 175
C7 175
C8 170
Leak down test result:
C1 3%
C2 3%
C3 3%
C4 3%
C5 3%
C6 0%
C7 3%
C8 3%
12-16-2014, 01:15 PM
#49
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You are supposed to pull the fuel pump relay when doing a compression test. Otherwise you're still getting fuel into the cylinders and will skew your numbers and possibly flood the cylinders if cranked too much
12-16-2014, 01:16 PM
#50
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As mentioned earlier, the fuel pumps should always be unplugged for the compression test. Any liquid in the cylinder will aid in sealing and bump the numbers up a bit. Worse, they could even them out and hide a potentially low cylinder... which is a more valuable output than the raw pressures themselves.
