K&N's RU-3260, which is what fits the deuce with MINOR modification flows 1130 CFM clean. Probably a little less when dirty, call it about 900 cfm.
So, flowing more air is a good thing, right?
Bjorn, if you were closer, I'd love to loan you mine for this test. Of course, I paid about $40 for mine with tax. And it is the last filter I'll purchase for my deuce.
Jim, get a low pressure gauge on ebay! They are listed all the time, keyword "magnehelic". They go for less than $10 usually and are calibrated in inches of water, cm of water, pascals, psi or other.
Simply run a plastic tube from the air filter canister to the gauge and you are good to go.
I even got a mounting bracket in one deal (see image above).
The capacity of the filter is one thing that should be matched to the engine requirements, but the restriction at a certain flow rate is what makes the difference.
This is my understanding: A higher air flow rate will lower the EGT, permitting more fuel to be burned, which in turn equals more power. So if there is enough air for the fuel to burn without exceeding an EGT of 1,200 F, then more air wouldn't do anything unless the fuel was turned up also.
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. Heated dual tank system for biodiesel/veggie oil use.
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"
Bjorn,
I am on ebay right now. What should I look for as far as the amount 'measured' goes?
It seems that most appear to be 2 inches of water or less. Isn't that too low to measure what we are attempting to measure? This type stuff is new to me, so speak s l o w l y for this old guy.
I'll say, keep looking, you need to be able to see the reading while driving so a full scale of 10 inches of water should be good or the equivalent in cm of water, which would be about 25 cm of water full scale.
My readings were all below 20 cm of water.
BTW, the Magnehelic gauges can be connected to read pressure, vacuum or differential pressure. There are 1/8 NPT ports for all these options.
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. Heated dual tank system for biodiesel/veggie oil use.
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"
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. Heated dual tank system for biodiesel/veggie oil use.
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"
Just a comment. When you have to drill a hole where you can't catch the debris at the end. Fill the grooves of the drill bit with stiff grease and run the drill at slow speed. It will catch almost all of it.
crane truck you are correct, the more air flow, the lower your egts will be, and the more fuel you can pour to it, =more ponies . But you also have to expell the same amount that you have gained in the intake, otherwise you'll have a bottleneck on the other end, at least at wot. How much will the deuces exhaust flow may be the next question. I've always been told whatever gains you make on the intake, have to be matched on the exhaust side
Bjorn
Try removing the mushroom from the intake side of the filter hsg. I'd bet the perforated metal screen is restricting the flow some. You could also drop the filter canister completely and clamp on a K&N to check restriction from the canister itself. You would need to hook up your Magnahelic to the intake tube somewhere to check that out.
I think I have a 0-10" magnahelic at work in my junk box, I'll have to check.
I was already getting ready to sandblast the screen section on my intake mushroom, it has many layers of paint closing up the holes. Maybe drill them out a little, as long as I don't allow dirt daubers to get in.....
Robert Miller
Currently out on the road programming robots.......
Bjorn,
One thing occured to me. I wonder how much difference the altitude will make. I don't know what your altitude is there in VA, but here in Denver, it's at least 5280 ft above sea level. OR MORE.
So will the thin air here affect the readings? Just curious.
Jim: Take some readings and let's compare! I'm at 3,000 ft btw.
Robert: I honestly don't think the screen could have much effect on anything except perhaps small birds.
Almost tempted to run without a filter....sombody talk me out of it!
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. Heated dual tank system for biodiesel/veggie oil use.
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"
