in typical broke *** me fasion i might have to resort to building my own header...

the flame suit is on and its watered down ...so let it begin ...
seriously i have a friend who builds his own turbo manifolds so he is a skilled welder and there is enough info out there for me to not screw it up too bad..

im not after huge gain but it has to be better then the stock f20b header.


the question is should i go with 4-1 or 4-2-1...the f20b is like a big b16 to keep it simple ...unlike h22 where power is dying around 7000 this thing starts to really pick up about 6500 rpm ..i love the top end but should i try to get some more midrange out of it or just stick with where the motor makes its most efficent power ...

i do plan on some RMcams but that will have to wait a long time as i ran out of stuff to sell
lol

any help would be great and i fully understand that headers are not somthing to throw together but i dotn have much choice at this point nor do i care ..i plan on using a burns collector and if its cost effective enough im gonna use stainless

thanks

 

up for any info

thanks

 

i think 4-2-1 is designed for low end power while 4-1 is more for top end...im not sure but thats what i have been told at any store i got when looking for header

 

yes you are correct ..
but what i was wondering is if i go with a 4-2-1 would it help my midrange but still improve top end power..or should i stick with a 4-1 since thats where the motor makes most of its power be default

thanks

 

A properly designed 4-2-1 header that is contructed properly will increase the midrange and give a fair amount of power on the top end of the curve.

Tri-y's are really hard to build correct, getting the header equal length with properly cylinder pairings can be very difficult.

Usually a 4:1 can provide some fair midrange gains with alot on the top end, just depends what rom range the header is tuned for.

 

thanks casey

i need to phone to get some ideas as to what these collectors are worth ...ive decided to do te 4-1 as it will be easier ...

is it worth it to go to stainless or should i do mild and if it works good mabye build the next one from stainless

 

421 if daily driver but 41 if daily driver and alot of straight aways

 

I always try and build the first one out of mild because it is much cheaper to trash bends. If you don't like a tube tear it down and just make another one.

You have collectors currently?

If you have any questions feel free to give me a ring

 

thanks ..im gonna call in a bit

i have no collector yet ...yea you righ ton the mild ..be much cheaper lol

the rev range i have now with stock type s h22 cams and gsxr itbs starts to really pull about 6500 and dies of around 8000

with tunnign i know there is more in the midrange but with cams ive seen thses motors make there peak at about 8500rpm and that was with a 4-2-1

i dont mind reving it cause it sound great lol
but the stocker has to go i can only imagine how much its holding back

 

yea 4-1 usually gives you the most overall power. but its in the top end range where *** the 4-2-1 gives it to you in the mid range as well.

 

i said ***... haha

 

4-1 all the way. Honda's usually depend on their top-end hence Vtec, so build that up as much as possible