True dual exhaust, diameter question

[G.W BUFFALO]

Okay so I'm getting to the point where I'm starting to think about exhaust systems for the truck. Was thinking I might go with true dual exhaust, just until I get the turbo on which might be another year. I have a dual exhaust system that I had made for my 79 f 250 it's 2-1/4" pipe which was fine for the 351M but will it be enough flow on the diesel. I could just as soon make something 3 inch but this I already have and it is very nicely made. It would only require a little bit of modification to put on the truck, I just dr onto know if it will move enough air... What do you guys think in idi land?

 

[79jasper]

I would think that would be big enough. I don't know if actuality is the same, but wouldn't that be equal to a 4.5 single?

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[riotwarrior]

Pi Rsquared for 2.25 =3.9759609375 inches square x 2=7.951921875 square inches
Single 3"=7.068375 square inches so just slightly less than 2 x 2.25 inch duals
Single 4"=15.90384375 square inches so nope 2 x 2.25 does not equal a single 4.5 inch pipe...

Math dont lie

Single aftermarket 4" setup would be way lots and be way lots when uou get turbo.

JM2CW

 

[79jasper]

Nope, it doesn't.
Well diamond eye has good price for 4 inch kit on the obs powerstroke. It's mostly the same except the downpipe.

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[G.W BUFFALO]

I'm not gonna get into making a y-pipe.. It's only gonna stay on till the turbo is on, then I'll yank it all for a 4" single exhaust.. Maybe I'll just stick this on and see how it works, wish it was bigger tubing but atleast it don't cost me anythung...

 

[laserjock]

It's plenty big. I think that's what factory size was and it was just a single. I have a complete factory NA exhaust laying out in the yard. If I think of it I'll measure.

 

[sjwelds]

^^^Yep.

 

[chris142]

Single 3 inch on mine