Well ive been super busy at the shop but i got around to making my short runner intake manifold for the KA, im running bikirom so i had to maintain the idle control system.
Manifold is all aluminum made everything myself, currently its sandblasted so i need to decide whether to polish it or paint it.
here is the turbo, its a genuine garrett that i rebuilt, its a T3/T4 stage 3 shaft, .70 A/R comp and .86 a/r turbine husing. dont remember the trim but i think it was 68 trim.
that looks like a job well done to me, but I dont know much about fabrication so, but what I am wondering is where the intake runners meet the TB housing did you weld it from the inside ? I cant see the welds…
great work !! I will probably make the exact thing when my KAT project gets on the way.
are you running velocity stack on this at all?
Im thinking of welding it the exact same way, first the flat plate to the runners from the inside then the half moon pipe. still I would add more weld to the outside of the runners.
what gage of alluminum are you using?
any difficulties welding to the cast alluminum runners? thats one of my concerns
no baffles inside its just a straight tube, you want that so air flow to each runner a evertless.
doba. the half moon pipe was actually a gmc draftshaft that i cut up and cut a side off of it to make it a half moon. the welds are sufficient to hold and do what they need to do. no need to get all sloppy.
im running a internal velocity stack basically the runners go inside and i have ported them to tapper inside the runner.
total time spent was around 4 hours.
the end tanks i also made from 3/4 inch aluminum plate.
I realize the additional difficulty with trying to do so, but you should have tried making a plenum that tapers off toward the back, because this way you’re not going to get equal flow into all the cylinders.
to be ohnest i could have built a 2000$ dollar manifold, there is nothing stopping me as i can fabricate anything pretty much.
the tappered design plenum would be benificial but the whole point is to have a large volume area for the head to be able to grab air from. this design is not simple but yet it is not the most difficult.
the point of this manifold is to get more air into the engine and free up tons of room around the engine bay, plus it looks great.
if i build a superman style manifold down the road it will be flow benched and tuned for each runner and distance from throttle plate.
youre right, this might not be the greatest design in manifold but widely used cause it cleans up the bay, looks awesome, and still out performs a stock manifold.
yeah i had a throttle body in mind, but the reason i went this route is so i dont have too many variables to deal with when i slap it all together, once the car is tunned with the new manifold and turbo then i will upgrade the throttle body.
