Up Pipes 101

RickDLance

Active member
Feb 14, 2007
1,276
14
38
Neat little video, but IMHO doesn't prove much. What you would ideally like to see is a small vacuum on the other ports to help scavenge the cylinders.

Inherently a couple of brand manifolds would fail both those tests and if I get around to making a thread on the manifolds I will try to explain why.

As far as the up pipes, we always make our manifold outlets slightly smaller diameter and the up pipes slightly larger. We have checked about 20 - 30 manifolds and they seem to be pretty consistent. That being said checking them with a gasket would be the best idea.
 

Chevy1925

don't know sh!t about IFS
Staff member
Oct 21, 2009
21,637
5,777
113
Phoenix Az
Neat little video, but IMHO doesn't prove much. What you would ideally like to see is a small vacuum on the other ports to help scavenge the cylinders.

Inherently a couple of brand manifolds would fail both those tests and if I get around to making a thread on the manifolds I will try to explain why.

As far as the up pipes, we always make our manifold outlets slightly smaller diameter and the up pipes slightly larger. We have checked about 20 - 30 manifolds and they seem to be pretty consistent. That being said checking them with a gasket would be the best idea.

10-4, thank you for the info :D :hug:
 

Mike L.

Got Sheep?
Staff member
Vendor/Sponsor
Aug 12, 2006
15,681
232
63
Fullerton CA
Neat little video, but IMHO doesn't prove much. What you would ideally like to see is a small vacuum on the other ports to help scavenge the cylinders.

Inherently a couple of brand manifolds would fail both those tests and if I get around to making a thread on the manifolds I will try to explain why.

As far as the up pipes, we always make our manifold outlets slightly smaller diameter and the up pipes slightly larger. We have checked about 20 - 30 manifolds and they seem to be pretty consistent. That being said checking them with a gasket would be the best idea.

I just saw this. I don't think it proves anything. Couldn't you do the same test with a stock manifold and get the same results?
 

830king

Member
Oct 24, 2013
191
0
16
Central MN
Just got a set of these tow flows ordered with the black ceramic coating. Im gonna swap them when i swap trans....should be alot easier to do then.

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