How much back pressure is needed?
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Senior User
Joined: Feb 2002
Posts: 291
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From: Oregon
How much back pressure is needed?
79 F-150 with a 351W. I am planning on getting it to pass DEQ and then cutting the exhaust off right under the cab and make stacks up through the bed. Whar do you think? With out any mufflers will it have enough backpressure?
Thanks,
Lars
Thanks,
Lars
Post Fiend
Joined: Jan 2003
Posts: 8,600
Likes: 4
From: Iowa
How much back pressure is needed?
You dont want, or need, backpressure on a 4-stroke engine. It'll be loud without any mufflers, but should run good. Have fun! 
Edit: I think a couple of big rig diesel type mufflers would look good on that... hehe
Edit: I think a couple of big rig diesel type mufflers would look good on that... hehe
Senior User
Joined: Apr 2003
Posts: 224
Likes: 0
How much back pressure is needed?
ahhh the good old backpressure battle....
the truth is, you dont want or need any backpressure at all..
BUT
you do want a high exhaust velocity. some people mix the 2, say you want to get a new exhaust, well, if you use too big of a pipe, you may get less backpressure, but you also get a lower exhaust velocity, thats why you want to find a good size piping where backpressure is low and exhaust velocity is high.
the truth is, you dont want or need any backpressure at all..
BUT
you do want a high exhaust velocity. some people mix the 2, say you want to get a new exhaust, well, if you use too big of a pipe, you may get less backpressure, but you also get a lower exhaust velocity, thats why you want to find a good size piping where backpressure is low and exhaust velocity is high.
