Iam thinking of playing with my stock intake and carb setup. I was looking at the intake manifold and wanted to fill the holes and dips that dont need to be there. I was wondering if anyone has used any type of JB Weld type of stuff that will not break loose and fall in the engine?

Iam wanting to see what difference their would be between the stock carb and my Holley set up. If it is any where close track times, then I am willing to start modding the nikki?

 

Didn't you just answer some guy and then say this:
"...and search!"?

 

just wait for peejay to post... haha...


Nah, jb weld will hold up.... he recomends quik jb weld so you dont have to keep fixing it..... I ported/smoothed up my old intake a bit.... gonna go back and fully port it for a larger 12a, and get it powder coated or something.... get it ready for a pimp carl/sterling carb.... within a year or so, heh....

 

Just remember that the runners still need to be a little rough to produce turbulence to keep the fuel in suspension.
Wouldn't do to have fuel dribbling down the runners.
Now EFI is a different kettle of apex seals. Since the intake runners on port-injected engines only carry air, they can be smooth as a baby's tuckus. Except, of course the secondary runners on FCs, since they inject fuel somewhat upstream of the ports. Just thought of that. They could be smooth to that point, of course.

Now, nothing says you can't hog those suckers out! just leave them a little rough. Looks like the finish left by the grinding stones would be about right.
One caveat, I've heard one theory that says that a small mis-match between the intake and the ports, with the ports being slightly larger. that little step may help prevent reversion and robbong of the charge from one rotor to the next. The GSL-SE and FC make use of this reversion of course for their dynamic supercharging effect (that's why the plenum on the top of the intake is called a "dynamic chamber") so they'll benefit from being port matched.
Um, geez, didn't really want to write a dissertation, but there ya go!

 

what do you do witht the jbweld?

 

fill whatever holes you dont want there. Make the inside of the runners smooth, meaning no dips for emmisions and what not.

Sterling: ah, you got me, but then again I answered then said to search, meaning there is more info out there! Ha, ha, it is cool to bust chops, Iam down.

you stalking me!

 

milton, where is milton?

 

How rough do the runners need to be? I'm making an intake manifold for my 12aTurbo out of aluminum tube, so it starts out smooth. Would just sandblasting the insides make it rough enough?

 

yea, I think so, just think about a mist flowing through and you know how condisation works, it will stick easier on a smooth glassy like surface compared to a rough sand blasted surface that would make the mix stay in suspension.