Porting is done...FINALLY!

[Polo-1]

Originally Posted by Locobob

Results are iffy at best on a mildly modded 350, gains (if any) will fall within a dynos pull to pull hp variation.

That's because you need a 65mm

[rkreigh]

Originally Posted by LGAFF

I have always heard no gain from the 63MM TB

that is true, even on the strokers. the throttle body isn't the bottleneck.

I do however want to try porting the tiney little primary throttle blade

I do alot of part throttle driving, and I think it starves the engine for air until the secondary on the throttle opens up. this is especially true for me as I don't have any secondary plates in the heads anymore

probably should modify the linkage and just snap the big blades open off the get go!!

any thoughts on that??

[QB93Z]

Originally Posted by rkreigh

.......I do however want to try porting the tiney little primary throttle blade

I do alot of part throttle driving, and I think it starves the engine for air until the secondary on the throttle opens up. this is especially true for me as I don't have any secondary plates in the heads anymore

probably should modify the linkage and just snap the big blades open off the get go!!

any thoughts on that??

Maybe I am missing what you are saying. Isn't the point of the throttle valve to throttle the air flow to control engine speed? If you ported the throttle valve to a bigger diameter, the throttle plate would still throttle the air flow to maintain the desired engine speed/load.

Jim

[Locobob]

Originally Posted by Polo-1

That's because you need a 65mm

That stroker crank must have fallen off the shelf and hit you on the head, you should just send it to me before you really hurt yourself.

[rkreigh]

Originally Posted by QB93Z

Maybe I am missing what you are saying. Isn't the point of the throttle valve to throttle the air flow to control engine speed? If you ported the throttle valve to a bigger diameter, the throttle plate would still throttle the air flow to maintain the desired engine speed/load.

Jim

hi jim,

I'm talking about the tiny "primary port" in the throttle body. nobody ever seems to port that. but with the bigger displacement (390), and part throttle, it might help the engine breath better at part throttle openings with just a bit bigger port/plate

when you look at that tiny little port it just doesn't look right!

I've seen EHS modify the secondaries to blend them into one BIG oval shape blade (1 instead of 2) to really open up the flow

but yea, it's probably not worth the effort and cost to do the primary throttle port.