Full race not port matched?????

[evo L]

Originally Posted by 03whitegsr

Seems a little harsh considering Full-Race has since redesigned the manifold to have a port matched inlet?

first the OP says its not port matched but shows a pic of a gasket (which is much larger than the evo exhaust ports), then people tell him the manifold is good, he still argues, it does not take a genius to realize a port-matched manifold is better, easy fix, go to machine shop and have it port matched, i don't know why this was such a big deal to him... like the OP was all upset like as if full-race ripped him off or something...

Originally Posted by Wicked E

You're late to the program...

-E

i don't understand what your trying to say, seriously. If your saying i posted late i was watching this thread since the beginning and was trying to stay out, i try to be polite but sometimes i just gotta say something... like it really seems a lot of people on here are fixing up a car for the first time and have ZERO knowledge...

[03whitegsr]

The tread evolved from him thinking the port was supposed to match the gasket to him realizing the manifold flange was slightly smaller then the port where the gasket is oversized and he still wanted to port match it to the head port because he felt it would hurt performance.

Geoff, does the new flange match the gasket or the head port?

[Nicolas]

Originally Posted by evo L

like it really seems a lot of people on here are fixing up a car for the first time and have ZERO knowledge...

The bad thing is not to ask but to be sure that you know everything

[evo L]

Originally Posted by Nicolas

The bad thing is not to ask but to be sure that you know everything

touche

[addo]

Originally Posted by Full-Race Geoff

the 500hp "ceiling" is only applicable to the very old manifolds that did not have our twinscroll-specific cnc ported head flange:



As of 2008, every evo twinscroll manifold from Full-Race has our CNC ported headflange and can support well over 500whp.

if you have an old head flange, you can simply port it (i even recommend further port matching on the cnc flanges...)

Just wondered i'm picking up a second hand full race manifold next week. As you recommend porting i might give it a go, will a dremel touch it? also is there enough meat on it as i haven't seen it or any F R manifolds before? as i plan on using a fp red.

also is it worth ceramic coating?

like this;

http://www.zircotec.com/page/exhaust_system_coatings/60

cheers

[4G63DSM]

Originally Posted by 03whitegsr

The flow is turbulent to begin with so it makes me laugh when you say this supposed step would cause turbulence, like it would really matter in the bigger picture. The Reynolds number of exhaust flow in an exhaust runner is WELL above the transition region. On the intial blow down you are talking mach 1 fluid velocities in 900+ C temperatures. It's a highly turbulent flow and you are reducing the flow area, supposedly. If it was a diverging cross sectional area change, sure, you could really hurt flow, in a theoretical sense. But even then, the pressure drop associated with this transition probably is only a few percent of the total pressure drop of the runner.

Just by looking at the pictures and being familar with the 4G63 I can tell you that port is probably very close to being "port matched" though.

Steady state ought to be a fair rough estimation... but exhaust is a pulsation, and you all need to be talking about wave propagation...

Hytech use to have a great little article about scavenging cylinders and reversion chambers... fun stuff..

[TIGERJC]

should have bought it new, then you would have had somebody to complain to

[addo]

I just Received the full race manifold and it looks in good condition and is ready for some port machine work. I've just noticed that some of the holes dont line up correctly, do you think these will pull in line once bolted to the studs? following porting then it will go to get ceramic coated

[althemean]

I have no experience with the Full Race header but....typically quality headers will have those cuts to allow for the flange to move so it does not warp from the heat cycles (heating and cooling when running-shutting down) I have had this happen on previous cars and it usually leads to an exhaust leak.

The real question is..is the flange still true or flat where it bolts to the head. Will the bolts line that back up. I doubt it....to a degree it may...and you may have to force it over the stud.

This is just my opinion from past experience.