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[ashb82]

how does head flow effect power on turbo cars. i ask on honda-tech but they tell me it dont matter on a honda. have a f22a head the intake side flow good but the exhaust sucks. i bought a machine to do valve seats and guides. i built me one of those diy flow benches. so for the hell of it i took a old f22a head i had and machined to to fit h22 valves just so i could flow it.h22 vavles are 1mm larger than f22 . i dont know how to convert the flow bench manometers reading to cfm but it will out flow a h22 head or a b16 head on the bench. i have learned porting does about nothing for a honda head, but when you radius seats, chamber work and back cut valves it flows even better.

[bouncinofftherevlimiter]

When i dropped a couple exhaust valves on my F20B head (same as H22) and the valves were completely different length compared to F22, and wouldnt work.

Dont know if you knew or accounted for that, but just thought i should throw that out there.

[ashb82]

yeah i know they are to short i just put them in there to see how much large valves would increase flow. i have no plans to run them.

[flat_black]

pics and info of DIY flow bench

[ashb82]

pics and info of DIY flow bench

i found a video on youtube.com i still dont have the thing going like i want. i have a huge vacum source on it, i bet i could pull 100" of water. its a 600 volt 7.5 hp dust collector. i can compare flow of heads and i been putting some that stuff from autozone that glows with a black light u use to find leaks so i can see the flow. its alot of fun i cant wait to get some heads on cars to see if they make better power.
HOMEMADE FLOW BENCH AIR BOX

he has some good videos on them if you watch the other videos.

[crxvtec91]

I say most cars in the sub 500hp range dont really need a ported head. In some cases a badly ported head will lead to the motor blowing apart

[ashb82]

if one cylinder out flowed the rest it would need more fuel

[chris]

The size turbos people are using these days head porting is almost worthless

[JaredKaragen]

I say most cars in the sub 500hp range dont really need a ported head

Enough said.

Though I did have a difference in fueling and the butt dyno said it was faster.

[NoPistons!]

The size turbos people are using these days head porting is almost worthless

that's what i was thinking a few months back.  We have variable geometry.  Triple ball bearing oiless.  All different size wheels and blade design, housings, inlets, outlets.....  I mean you can pick the right turbo to put you exactly where you want to be.   Things have come a long way from grabbing a shitty .48 ar t3 or t25 and trying to see how far you can run with it. 

I worry more about the fluid dynamics of the exhaust gas and compressed air mix above all else.  Shorter your intercooler piping the faster your turbo will spool up because less wall friction.   It's not new technology at all but thermal coatings to me are worth investing in over upsizing valves, getting new cams, springs and retainers.....  You lose alot of power to heat soak in turbo cars.  Heat that should be harnessed to spool your turbo up.   Lower coolant/oil temps as well as increased detonation resistance?  Well worth it and totally want that shit in my life in my next engine build.   Could you imagine what the results would be like using an equal length or twin scroll cast mani that's been ceramic coated inside and out?   

All motor is a different story.  The engine breathes on its own accord and needs all the help it can get.  Totally justifiable to spend $1000+ on head components and whatever machine work you can't get done on the homie/diy hookup tip.

[chris]

It is not uncommon to see 40+ whp on turbo cars with a properly ported head but the mass of people just run these huge frame turbo's with ungodly amount of lag so why bother.