OzFxCoupe

Even if you just kept the stock runners then fabbed a BIG a-la-airram plennum you'd see good results, I think.

I reckon that welding bigger diameter pipes to the smaller stock runners could get messy if you don't get it 100% right... If you want to play around with the runners then just re-do them entirely & re-use the stock fuel rail fing02.gif

faithofadragon

well the problem is gettin the injector bosses just right plus the flange goes into a oval so thats kinda hard to copy

Denisst99

in your case i'd still use the stock flange to get the ports shape and the injectors bungs,
cut the stock IM around 2 inch fron the sealing surface and build up your new IM runner from there

you will have to shape your new runners tubes into an oval shaped like in the link you showed us but it's quite easy

faithofadragon

but the problem with that is the outer runners have a bend to them

Denisst99

if i recall correctly the first bend is around 2" from the sealing surface. .right after the injector bungs

faithofadragon

hmmm i wonder if i could use some silicone to connect the two

the gsx-r does that with there throttle bodies i think

which would be better a sheet metal plenum or a tube plenum

i plan on using velocity stacks no matter what

OzFxCoupe

^^ What about keeping the new runner round through the bend then just tapered (oval-shaped) right before the flange... Like on headers & such.

faithofadragon

yeah but i cant think of a easy way to put that taper in

maybe im makin this to be way more difficult than it actually is

i got it!!!

i dont know why i didnt think of this before

why dont i buy a cheapo obx header and chop the piping off....i would get that taper at the end real easy and the header can be found used for cheap lol

OzFxCoupe

^ I'm not sure but I'd prolly just get a blowtorch to heat the ends as much as possible then get a hammer & slowly flatten them into the desired oval shape; once they're welded into the stock flange, it should be pretty easy to tidy them up with a bit of a port-job... Whichever way you do it, it shouldn't be that difficult.

Denisst99

if you get an OBX header you'l lget SS tubes. .not aluminium ;-0
get aluminium tubing then makea simple die like the one showed in the SDS link, heat the tubing like OZsuggested (this will get the aluminium much more maleable) then shape it on the dies with a hammer