how much diff will twin logs flow over tubular headers?
TECH Addict
Joined: Aug 2004
Posts: 2,866
Likes: 4
I dont want to get in the middle of any contest . I run headers on my car but my cousen runs a super stock tractor 90 to 100psi of boost has log manifolds on intake and exhaust here is a link to a pic f the tractor. It really dont show the exhaust but he runs around 2 psi of boost to 1 psi of back pressure. we have talked many times of how i do good to get 1 psi of boost to 2 psi of back pressure just food for thought http://www.distributorless.com/media/rides.php
also see how much torque a 100psi will make http://www.youtube.com/watch?v=PhRUO...eature=related
also see how much torque a 100psi will make http://www.youtube.com/watch?v=PhRUO...eature=related
Chris.
8 Second Club
Joined: May 2004
Posts: 371
Likes: 0
From: Savannah, TN
No 2 air reserch 3 inch in and 4 inch out that blowes into the intake of a 4 inch in and 5 inch out. it makes 30 plus of boost on the inlet of the big one .also runs a waterman top fuel pump. This is a diesel converted to methonal i have a funny one if i can find it http://www.youtube.com/watch?v=vAwL9...e=channel_page
Launching!
Joined: Oct 2005
Posts: 240
Likes: 0
From: Northern Chicago
I know headers pretty well, mainly turbo headers. I've built a couple thousand of them by now and that's not an exaggeration. We've done comparison's on smaller displacement engines and logs flow terrible when compared to a tubular. They do get the job done, up to a point, and are significantly cheaper than a tubular manifold. Just as in a tubular manifold there are a lot of variables that will determine how well a log set-up can work. But you can count on them every time to become a restriction at higher horsepower levels.
I know headers pretty well, mainly turbo headers. I've built a couple thousand of them by now and that's not an exaggeration. We've done comparison's on smaller displacement engines and logs flow terrible when compared to a tubular. They do get the job done, up to a point, and are significantly cheaper than a tubular manifold. Just as in a tubular manifold there are a lot of variables that will determine how well a log set-up can work. But you can count on them every time to become a restriction at higher horsepower levels.
Launching!
Joined: Oct 2005
Posts: 240
Likes: 0
From: Northern Chicago
Thanks.
I agree with that 100%. The larger displacement these motors have, compared to what I usually deal with, helps tremendously. Another point is that I would not be too surprised if the factory truck manifolds flow as good, possibly even better, than a traditional log style set-up. Maybe they need some porting? I've never seen the inside of one. Has anyone done any sort of testing along these lines?
Thanks.
Thanks.
You come highly recommended from Mike and Jeff from HStuning for 1.8t stuff, I dabble in a bit of everything. Jeffs jetta SCREAMS now.
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I can tell you coming from the truck world that there is pretty much no gain NA in swapping stock truck manifolds to shorty tubular manifold, so they must flow pretty well.
Staging Lane
Joined: Jan 2008
Posts: 58
Likes: 0
Like headers in any application, the only benefit is in the upper RPMs. Since its "forced" you probably wouldnt see much difference. After the turbo is where its more crucial for flow. It would be interestnig to see the difference in an exact same setup just swapping tubular headers for log one. Anyone with a dyno bored?
