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Old 03-13-2006, 12:43   #19 (permalink)
cranetruck
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Measuring the restriction of the air filter is a little tricky while driving, but I took the deuce to the store this morning and checked the numbers as I was driving.
According to this site, the comparisons are made at 350 CFM.
http://home.usadatanet.net/~jbplock/ISO5011/SPICER.htm

Driving at 2,000 rpm with a turbo boost of 3 to 5 psi requires approx 360 FM of air. My vaccum gauge showed about 8 cm of water (3.2 inches of water).
Also at 2,000 rpm and about 1 psi of boost (315 CFM) gave me 5 cm (2 inches) of water on the gauge.
At 2,400 rpm and about 10 psi of boost gave me 15 cm (6 inches) of water. That's about 550 cfm.

The filter only has about 1,000 miles on it, so it's pretty clean.
Looks pretty good to me, but somebody else should make similar test runs for a more accurate picture.
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Avatar: XM757 in OK prepared for 1,000 mile trip home. Part of 6,000 mile journey in 2006.
1968 M49A2C modified with 1960 M756A2 truck bed and 1975 HIAB 765A knuckleboom, exhaust brake, VIC-1 and more.
1969 Ford XM757 8x8, 5-ton Pershing 1A truck tractor...the "improved MV".

"Some things can't be made better, just differently......a lot of things actually"
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