Thread: Opinions of this header....

Dont be too harsh peeps, it only took a few hours to make....

very much a work in progress and a prototype.





Based the idea on a p12 20v header.

Cool!!

Give some more info. What did you use as a base etc and what did you modify.

Looks cool. kinda like a short 4-1

Haven't read up too much about the subject but have a low hanging 4-1 custom header that I was also considering turning into a tri-Y to free up some clearance under the car. Just not sure what effect the short primaries will then have overall.

pro: more ground clearance

cons: will have to wait and see results i guess.


its great to see people developing headers for our car again... Mazworx and now you guys... even if they all don't pan out, eventually (with more people trying) one of them will pan out...

Looks great!
I guess, powerband would be sooner compared to most 4-1.
Could you give an estimate price to build these ??

it looks similar to B-Series RMF header, the only difference is on the runners the rmf header its like a scramble of runners then they join one next to each other and the 4-1 union is exactly below the oil pan the choke is 2.25 i think after that the size start growing gradually until a 2.5" out. And based on honda guys the results are over the Tri-Y design wich is one of the best options for honda guys... lets see if i can get a pic of it


pics:

The sharp turn after the collector will be the killer.

Would be nice if the primaries came out further to help the turn (less of a bend) after the collector.

Thats a good point, i might consider a slighty different collector location to reduce the bend.

They are huge, 45 off head, to 47mm 1st bend, then 50mm into the straights and collector, then 2.5" off collector.

I dont know that i will be able to make them in bulk, but they are very easy to make once ive made the collector, and im working on a jig to cut the pieces for the collector which will make things heaps quicker.

I might try a set with the collector under the engine too and try them both on 2 similar cars that 2 of my friends have and see which works better.

Cheers for the input guys.

This type of header is what the large stroke motors would have to run.

Large diameter tubing with shorter runner. The specs are close to what I am building now, I just have longer tubing.

I would have gone this route but given the size of the tubing and collector it would be hard to fit everything while minimizing the bend after the collector.

Your Neighborhood John Britten I see Do work cousin... You should run a comparison dyno on everyone you try...