low compression test results
08-26-2014, 12:00 AM
#1
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low compression test results
Hi
recently I build my VQ35DE from 2004 with CP pistons 95.5mm 8:5.1 and BC connecting rods after this I notice that engine lost power in low RPM range. My greddy turbos are rising at 4K RPM and I totally don’t have enough power until they risen. I use this car to drift so I need power in low RPM as well.
So I did compression test and that’s are results:
1 -119 psi 6- 119 psi
2 -116 psi 5- 116 psi
3- 116 psi 4- 116 psi
engine temperature 30-40C
Anybody has similar setup and know what should be compression level for it? Is this normal compression level??
I worried that my pistons rings are fried because compression is very low.
How to improve power in low range of RPM?
I have intake and exhaust camshafts from rev up motor.
recently I build my VQ35DE from 2004 with CP pistons 95.5mm 8:5.1 and BC connecting rods after this I notice that engine lost power in low RPM range. My greddy turbos are rising at 4K RPM and I totally don’t have enough power until they risen. I use this car to drift so I need power in low RPM as well.
So I did compression test and that’s are results:
1 -119 psi 6- 119 psi
2 -116 psi 5- 116 psi
3- 116 psi 4- 116 psi
engine temperature 30-40C
Anybody has similar setup and know what should be compression level for it? Is this normal compression level??
I worried that my pistons rings are fried because compression is very low.
How to improve power in low range of RPM?
I have intake and exhaust camshafts from rev up motor.
Last edited by aas350z; 08-26-2014 at 12:15 AM.
09-15-2014, 07:16 PM
#2
My motor, with 8.8 Wiseco pistons, had the following compression numbers:
168
172
167
170
168
172
This was 7 full cranks on each cylinder. Make sure you remove all of the spark plugs when testing. Also there are a lot of variables when comparing results from others - how warm the engine was, how many times you crank, how strong your battery is, how accurate your gauge is, etc. The most important thing is that they are consistent across the cylinders.
168
172
167
170
168
172
This was 7 full cranks on each cylinder. Make sure you remove all of the spark plugs when testing. Also there are a lot of variables when comparing results from others - how warm the engine was, how many times you crank, how strong your battery is, how accurate your gauge is, etc. The most important thing is that they are consistent across the cylinders.
09-15-2014, 09:21 PM
#3
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On my built block (9.0:1)a few weeks back got between 112 and 119 but I believe I lost my headgasket, I might think you have a similar instance. I cranked about 12-15 times per cylinder and I did it on a warm engine, my battery is strong I have a decent charger/tender that I use to keep it maintained.
12-25-2018, 02:19 PM
#4
On my built block (9.0:1)a few weeks back got between 112 and 119 but I believe I lost my headgasket, I might think you have a similar instance. I cranked about 12-15 times per cylinder and I did it on a warm engine, my battery is strong I have a decent charger/tender that I use to keep it maintained.
12-25-2018, 02:47 PM
#5
350Z-holic
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12-25-2018, 03:07 PM
#6
12-25-2018, 03:11 PM
#7
350Z-holic
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How does your oil look? any milky foam in the oil or on the oil-fill cap?
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12-25-2018, 03:54 PM
#9
350Z-holic
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white smoke in the exhaust?
A leak-down may be in order ... might prepare yourself for rings!
A leak-down may be in order ... might prepare yourself for rings!
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