Intake problwm - Diesel Truck Forum -
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post #1 of 2 (permalink) Old 04-19-2007, 01:27 AM Thread Starter
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Intake problwm

I put the napa 6637 air filter on my truck yesterday and I used a 3 inch schedule 40 PVC 45 DEGREE elbow, i put the factory restriction gauge in the tube and when i drove the truck it read that the airflow was 100% blocked. When i had the stock air filter on it never read that the airflow was that restricted. Did i do something wrong??? Would a 4 inch exhaust elbow make that big of difference?? Thanks for the help.:smoke
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post #2 of 2 (permalink) Old 04-19-2007, 01:43 AM
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Originally Posted by Powerstroke250
Would a 4 inch exhaust elbow make that big of difference?? Thanks for the help.:smoke


a 4" is 77% more area, and a huge difference to inlet restriction, considering you need to move anywhere from 500 to 1000 cfm.

IOW, in a 3" conduit, 1000 cfm is 230 mph. Major restriction. In a 4" conduit, that speed is reduced nearly in half. There is a square relatiuonship between speed and restriction force, so the 4" will have 1/3rd the restriction.

Also, if you can provide a nice flair to (both) conduit ends, there will be considerably less restriction still.

Vehicle Systems Engineer/Professional Tuner
04.5 GMC 2500HD SRW LLY


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