I can't see your pics but I've done dies for tube forming. For a rolled end on plain tube, I did one some years back in mild steel. It's all in the taper angle and the radius for the roll. Then it has to be lubed when you use it. The one I did was for 2 inch 16 gauge. AFAIK, Autobend still use it.
For a full taper bellmouth, I don't use steel. I've made them in alloy. Steel, I wouldn't have thought that much pressure should be needed. What gauge tube are you using ?
the first die i used had no flange to curl the metal back over, the second die has a taperd curve to help it fold over. i am using 2mm exhaust tube. my first attempt i used no oil the others i used oil and had much better results, i also filed the weld seam off on the inside because attempt one it damaged the die. the 12 tons was one of those cheap hydraulic presses so it probably wasnt a real 12 tons. the tube is 40mm diameter the major diameter of the die is 60mm
2mm wall is unneccessary. 1.6 or 1.2 wall is plenty.
Seeing as how you will be blowing through the carbs, what is you plan for fuel pump, sealing the carb vents and boost sensitive fuel pressure regulator?
it's not a bad thing till you throw a KLR into the mix.
those cheap ass bitches can do anything with ductape.
(PostalDave on ADVrider)
I made one from scratch but it was a long time ago before any of the things you can now buy off the shelf were available. It was basically a spring loaded diaphragm type regulator valve with boost pressure ported to the spring side , so the spring set basic fuel pressure (about 3 PSi) then as boost came on it assisted the spring so fuel pressure was always about 3-4 psi higher than boost. This was using a Weber DCOE carb (on a Mini) The float bowl was vented to the airbox so the float chamber was always at what ever pressure (or non pressure) that was in the airbox, and the fuel was always about 3 -4 psi above that. worked great until the thin brass weber floats collapsed under pressure. Plastic Del'Orto floats fixed that. The other modification to the carb was to use dual row sealed bearings for the butterfly shaft. Not directly relevant to your setup but these are things (fuel pressure, float bowl venting, air leaks from carb spindles, etc) you will need to consider.
fuel injection might actually be easier although a lot more expensive
the valve I made looked a bit like this (not quite as elegant) but worked exactly the same way as the bypass regulator .https://www.jegs.com/tech-articles/h...tors-work.html
it's not a bad thing till you throw a KLR into the mix.
those cheap ass bitches can do anything with ductape.
(PostalDave on ADVrider)
There's a guy ex Kelford Cams who trades as Philspeed. Has a website - which I admit I haven't looked at in a while.
He was carrying the exact sort of fuel pressure regulator you need - boost sensitive.
awesome, thanks for that.
i will do some reading before i buy anything i think. so many things to choose from.
i have been chewing over ideas on what i should do next, as in how i should feed the plenum.. should i try cram a small intercooler into the mix, fab some crazy pipe work or just feed the plenum from the end and be done with it. the problem i have is the turbo is abit close to feed into the back, i could go though the bottom but i just dont want to, if i go in the side i can use the original waste gate actuator mounting points but i will have to face the outlet of the turbo backwards and probably come on the outside of the frame to hook into the plenum.
i could buy a small intercooler from a starlet and chop it down to fit.. they arent that expensive.
can anybody see a problem with having the plenum fed from both ends? something that looks kinda like a C into each end, i guess the problem would be pressure would go back into the turbo right?
Could you not just rotate the compressor housing and have it going straight into the back of the plenum?
it's not a bad thing till you throw a KLR into the mix.
those cheap ass bitches can do anything with ductape.
(PostalDave on ADVrider)
A rising rate fuel reg
This is the cheapest you will find
http://www.turbogemini.com/Blow%20Through%20FPR.htm
I am not sure about blowing through those carbs tough a CV carb is preferable?
ahh, thanks for clearing that up! that makes sence and i have actually read that multiple times but it only just sunk in ... like just then! easy to over think things.
thanks for being patient with me fellas! its great to have people to ask. ill go get some tube tomorrow if i get a chance and get stuck in. i am looking forward to attaching the risers to the gsxr triples.
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