Duramax Diesels Forum Truck of the Week
  #76  
Old 08-19-2015, 05:06 PM
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I am running a social af9100 with 150% injector .

My cam is around that spec and my compression ratio on my motor is 16:1 and I see 290-300 psi cold, yours seems about right.


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  #77  
Old 08-19-2015, 05:40 PM
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My cam is around that spec and my compression ratio on my motor is 16:1 and I see 290-300 psi cold, yours seems about right.


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Thanks. Not to much info out there on actual compression with different ratios.
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  #78  
Old 08-19-2015, 05:45 PM
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Thanks. Not to much info out there on actual compression with different ratios.

Yea I was looking for info the other day but figured since mine were all within 10 psi of each other that I was good


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  #79  
Old 08-19-2015, 09:39 PM
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The pressure you will see will depend greatly on the length of the connection to the compression gauge. The longer the hose, the lower the indicated pressure. Each cc of additional volume reduces the effective CR by about 1/4 point and thus the indicated pressure on the gauge.
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  #80  
Old 08-19-2015, 09:48 PM
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The pressure you will see will depend greatly on the length of the connection to the compression gauge. The longer the hose, the lower the indicated pressure. Each cc of additional volume reduces the effective CR by about 1/4 point and thus the indicated pressure on the gauge.
Is there a length of hose that is considered to be some sort of "national standard" or "accurate" when doing a compression test?
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  #81  
Old 08-19-2015, 09:59 PM
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No
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'04.5 EC/LB 4x4.
Howard Rods w/ oiler hole.
Oval Chambers and valve reliefs cut in Mahle Cast Pistons. 17.5:1
SoCal Stage 2 heads, 3388 Cam, Billet Flywheel, and harmonic balancer.
Danville 68mm VVT Turbo
100 over injectors.
PPE Dual CP3s
ProFab Castflow headers and uppipes.
100 PSIA MAP Sensor
Kennedy dual lift pump.

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  #82  
Old 08-20-2015, 05:17 AM
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Correct me if im wrong but the adaptors with the valve in them that hold the pressure should still get you to the same point after so many revolutions? So let's say the first one gets to 220, second, 260 and so on. Just curious John.
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  #83  
Old 08-20-2015, 06:42 AM
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Correct me if im wrong but the adaptors with the valve in them that hold the pressure should still get you to the same point after so many revolutions? So let's say the first one gets to 220, second, 260 and so on. Just curious John.
Yes. If your adapter has the schrader valve in the tip, the length of your hose will only change how long you have to crank on it to get max pressure. Crank until the needle stops moving.
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  #84  
Old 08-20-2015, 06:49 AM
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Putting my motor in now that has 16.5:1 .020 overs. will just be waiting on injectors after Saturday to have fire. can't wait to hear them.
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  #85  
Old 08-20-2015, 07:10 AM
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Quote:
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Yes. If your adapter has the schrader valve in the tip, the length of your hose will only change how long you have to crank on it to get max pressure. Crank until the needle stops moving.

Ok. But the adaptor needs to be same length as glow plug with valve at vary end correct? The adaptor I used did not go down as deep.
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