hf manifold breaking point
 

hey, how is everyone? lol im new to the homemade scene trying to put together a decent kit for my sohc vtec. Just wondering if anyone can tell me the limits of boost on an hf manifold, im looking to run anywhere from 12-15 psi. any info. would be greatly appreciated, thanks

Re: hf manifold breaking point
 

they tend to go downhill around the 300hp mark.. ported and for a boost setup like yours for low psi and not max power you can get away with it

Re: hf manifold breaking point
 

HF manifold will work nicely. I have yet to see anybody boost it to the "breaking point"

Give it a nice port match to your head and you'll be set. HF mani makes me happy

Re: hf manifold breaking point
 

hf or std manifold i thought the std was larger ports and runners?

Re: hf manifold breaking point
 

std I do believe has the larger ports.

I used an hf on 15psi, porting one is a pain in the ass, but whatever.

hf ftw

Re: hf manifold breaking point
 

i ran my vx manifold to 17psi daily with a 14b, then my wg actuator arm broke and the car saw 22 + psi and cracked a sleeve.

so now i'm going to port my manifold, rebuild my engine and go for it again.

Re: hf manifold breaking point
 

thanks alot guys, appreciate the info. greatly :8

Re: hf manifold breaking point
 

you wont break it with <20 psi so go for it :D

Re: hf manifold breaking point
 

HF=High Flow. It'll work. :y Power goal?

Re: hf manifold breaking point
 

I'm taking a an electric die grinder and a carbide bur to mine to port it out nicely. We'll see how it goes :S

http://www.grainger.com/Grainger/items/1Z356 is the bur I'm using.