While looking at the set MD manifolds I got I was wondering if the up-pipe on the pass side would interfere with the down pipe.
Any experiences out there, yet?
Any experiences out there, yet?
Medium duty manifolds and high flow up pipes
- Thread starter JoshH
- Start date
Pretty sure they would, but these are for a twins truck so there is lots of rrom to play with.
Ahhh...twins sure! I was thinking inside my box
:rofl: The secret here is to get that pesky downpipe out from behind the motor:happy2:
It sure does. I spent a good part of a Saturday trying to get mine to fit on the passenger side and couldn't get it to work. If you have access to a shop that can off set the down pipe in the areas needed it would then work. I ended up giving the passenger side to a buddy of mine that has twins. The passenger side isn't as bad as a restriction as the drivers side.
The pass side manifold may not be as bad but the pass side up-pipes is much worse than the drivers side.
When I had them both in my hand I figured the way the driverside had all angles to it, it would have been the worse flow wise of the two exspecially the transition from the manifold to the up pipe as it looks like it hits the wall of the up pipe. Passenger side was ovaled down a bit but looked like it was better. Then again after the bloody knuckels, cussing, and talking to myself like some mental person I was just happy to get to use the driver side and the stock passenger side back together with no leaks
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When I had them both in my hand I figured the way the driverside had all angles to it, it would have been the worse flow wise of the two exspecially the transition from the manifold to the up pipe as it looks like it hits the wall of the up pipe. Passenger side was ovaled down a bit but looked like it was better. Then again after the bloody knuckels, cussing, and talking to myself like some mental person I was just happy to get to use the driver side and the stock passenger side back together with no leaks
I know the bend you are talking about but one of the worst is the 90 on the pass side that goes into the turbo. It's pretty much a 1/2X clr bend. Heck it was so tight that they couldnt bend it and had to make it from 2 formed pieces. Maybe if I ever have some free time I'll have to flow them just for the heck of it.
Very true about that bend didn't think about it. Yeah some flow numbers would be cool if you ever get time. Would be cool if you could flow the stock setup as manifolds and up pipes and then medium dutys and or headers with custom up pipes. I think that would give everyone a good idea on how these work. Either way guys with twins I belive will benifit alot from the better flow.
I may do that some day, the only problem is that I can only flow stuff under a vacume and it is a proven fact that flow can be much different under pressure.
IE part A may flow more than part B under a vacume.....but part B may flow more than part A under pressure
A while back I heard that someone was working on a flow bench that would flow with pressure
Has anyone tried to cut the 4500 manifolds before they bend around the back of the motor and then reweld a flange similar to a stock manifold so they can be used with stock or similarly made set of up-pipes? In essence you would have a 4500 manifold that is the same dimensions as the stockers. Any thoughts?
Ed
Ed
It would most likely crack. Welding cast is a secret art that is never perfect. I can do it but no promice it will hold. If someone wants to try let me know....but I think it will let loose.
I'll be the beta tester then.
Mine were cut so I could turn them forward. I trust my welder and he is good. High nickel rod I think?? Only time will tell. Well, a lot of time since it is out of commission until I fix the head.
I'll be the beta tester then.
Ni55 or Ni99, chip the flux off and TIG, that right there is a big secret that I doubt you will read anywhere.
The bellows will fail and blow out on the 4500 up pipes.
We have done some testing on a very similar setup, have seen no real benefits to going with a actual header compared to the 4500 series manifold setups.
Up pipes look very good, very nice tig work there.
To those looking into doing something similar be sure to not cheap out on the quality of bellow.
did you make your own 4 to 1 setup?
Are you using slip joint bellows? (thats what they look like in the pic and judging by the price) If you run low on your stock let us know we got a line on some that are gauranteed to not blow out or over expand.
Are you using slip joint bellows? (thats what they look like in the pic and judging by the price) If you run low on your stock let us know we got a line on some that are gauranteed to not blow out or over expand.
Yes, I made the headers and up-pies, I also make merge collectors when I'm bored:rofl:
I use a few different bellows and have had good luck with all of them, but then again I dont buy junk either
I would be interested in seeing what you guys have. If I get a chance I'll try and call tomorrow
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