Here are pics of the Arrington 90mm throttle body bolted up to a Extrude Hone manifold with a hand ported throttle bore. You can not match the 90mm to the opening or it would end up oblong and you would cut into the throttle body gasket ring. In order to maintain the strength and integrity of the manifold I hand ported it as close as possible and filled the inset gasket ring with red silicone. The opening ends up about 88mm.........this is as good and as close as it gets to a high flow manifold!! BEFORE AFTER
Steve, what effect do you think that ridge might have on the air flow? There's some high velocity air moving through there at higher rpms right? Would a smooth taper make a big difference (theoretically)? I don't know anything about aerodynamics but could turbulence have a surprising effect there? (and just what is the volume of our manifold?)
Dave, I agree.........but if you "cut" into the lip any further you will cut into the gasket ring, which in my view will affect the structural intergrity of the opening. The hand port is flared at the ends. The Arrington TB doesnt seem to "truly" match up to the opening, its basically not centered so the opening ends up like 88mm. The roof is closer to the opening where as the floor has more "lip". I guess this is as good as it gets at this point.
Cant wait to see how this works for you. Im probably going to do something slightly different to get it to 90mm. Ill let you know how it goes
I wonder if someone could machine a sort of cone or flare to fit inside the back end of the TB? I suppose it might cost as much as the TB getting something like that made...
Well the way I plan on doing it is to remove the gasket groove all together. Basically mill 1/8th inch or whatever the depth of the gasket groove is off the front of the intake manifold. Then open it up to 90mm and port match it etc... Thats one thing that is nice about the arrington, it has its own oring so as long as you have a flat surface, life is good. This was not my idea, so I cant take credit for it, lol. I think its a good plan of attack and I know of atleast one person who has done it.
I have heard of this as well but to date have not seen one. It will end up bigger than 90mm. Of course at that point you would be hard pressed to use it with the factory TB. You would have to weld back material then machine it. That little Arrington o-ring is a bit small......mine leaked and whistled. I "spackled" it full silicone to get it to seal. Also on the left side is a "horizontal" opening that will need to be addressed.
Looking forward to your results Steve..... When is the ported manifold going to be available for purchase?????
