Volumetric Efficiency on the 24v's - Diesel Truck Forum - TheDieselGarage.com
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post #1 of 25 (permalink) Old 06-30-2011, 12:31 AM Thread Starter
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Volumetric Efficiency on the 24v's

How volumetrically efficient is the 24valve motor? Percentage wise.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #2 of 25 (permalink) Old 07-06-2011, 02:51 AM
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Would that not depend on the total amount of boost, velocity of charge air, and operational ambiant conditions? Just a guess 70 to 80 percent.
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post #3 of 25 (permalink) Old 07-13-2011, 03:31 AM Thread Starter
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For starters just zero boost, sea level (atmospheric) pressure of 14.7 and abient temperature of 68*F

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #4 of 25 (permalink) Old 07-13-2011, 03:32 AM Thread Starter
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Just looking for knowledge, seeing if anyone already knows. I dont have the equations memorized yet.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #5 of 25 (permalink) Old 07-13-2011, 04:12 AM
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Normal percentages are 70 to 85 percent much of that will depend on intake track valve sizes, valve timing, compression ratio, and exhaust and intake restriction (air filter, muffler).
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post #6 of 25 (permalink) Old 07-13-2011, 04:20 AM Thread Starter
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I know a good standard for actual inake restriction is a loss of 1psi. I've been seeing that. exhaust restriction should be zero with it straight piped turbo back right? What are track valve sizes?

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #7 of 25 (permalink) Old 07-13-2011, 04:21 PM
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Sorry about that, I should have writen Valve Timing.

On the exhaust you will have restriction, every 10 degrees of bend in the pipe = a foot of travel, and add the length of the pipe.

Last edited by later; 07-13-2011 at 04:23 PM.
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post #8 of 25 (permalink) Old 07-14-2011, 06:43 PM Thread Starter
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Thats alright. What would be a good loss number for every foot of travel?

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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post #9 of 25 (permalink) Old 07-16-2011, 09:51 PM
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You have a few factors involved.

A hx35 flows about 600 cfm peak --- run it thru the engine and it comes out as hot air and is expanded say 4 or 5 time.

A 4 inch exhaust pipe cools quickly --- your turbo inlet temp may be 1500 deg. f. but the exhaust tip may only be 350 to 400 so the exhaust gas condenses back, making things more difficult to figure. But just throwing a number at the pressure lose would be depending on volume, heat and drive pressure, ambent temp, maybe something else.

Just for a number, at 2400 cfm and 40 psi 100 ft of 4in ID pipe looses 2.2 psi of pressure.
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post #10 of 25 (permalink) Old 07-18-2011, 06:30 PM Thread Starter
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Just wondering if the trucks only idling does the turbo compressor still increase the air intake or is it basically naturally aspirated at an idle?

Thanks for the exhaust info.

90' 1 Ton Dodge Diesel 4x4 Stock 12v. 5-speed Getrag. Custom 6'' Alcan Springs. 35'' Toyos.

2002 Dodge 2500 Cummins Automatic Stock.
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