mhuppertz

I contend that if the flow potential of the Cummins 5.9 could be increased, then the power production potential would increase dramatically. One of my best friends is a former NHRA record holder, and is a consultant and friend of some of the top Pro stock teams. He has a flow bench and we talk theory all the time. Believe me, if you put a log intake and exhaust on an outlaw street turbo doorslammer you would win any races, and probably would loose a lot of engines.
So I am saying, why not do what they do on our engines?
I intend to!

2stroke

in english please.

mhuppertz

Sorry. I want to remove the intake log so I can port the intake ports, then make a new intake with better, more even flow to each cylinder. I also want to chuck the log exhaust manifold and build an equal length primary tube header so the backpressure on each cylinder is consistent, and so the pulsing is even.

sdseva

i like what you are saying but what does log mean?

ADMOPARMAN

mhuppertz

The intake and exhaust manifolds are shaped like a log. It's like taking a piece of black pipe and welding flanges on it for the exhaust. Sick...

mhuppertz

Honestly, when I look at my stock exhaust log and see how horrible restrictive and small it is, I wonder how any air at all squeezes it's way out the the exhaust ports to the turbo!

dillenger1

sound good in theory,and it will work,but it will ciost money and time.Tractor pullers do this stuff all the time.Just getting air to the back 2 cylinders is an upgrade.Not for me though because im working with 4 cylinders.haha

sdseva

i miss ren and stimpy what a great show

JQmile

You can only do so much since the ports themselves are so restrictive. I know someone who tested a header on his Cummins engine and found it to be worth about 10 hp and a 100 deg drop in egts on a 600 hp engine. Not worth the effort until someone comes out with an aftermarket head in my opinion.

The_Head

Take a look at the lovefab manifold they make for twins on a 6.7 I wish there were more manifolds like these available for Cummins engines.

http://lovefab.net/?p=9

soggy

IMO that thing looks terrible, but very nice fab skills.

Here are a few log intakes for Cummins

The_Head

It's flow that counts right?

fatt

The runners are too big, hence the relatively low torque number.

Rick 12v CTD

it's threads like this that make me wish I had money and a nice shop at my disposal.