Vtec Netherlands P21 Bisimoto header on

toadster · Post by **toadster** » Fri Oct 12, 2012 7:05 pm

LO

Thats looks fantastic

Work of art that's for sure

Cheers for posting

Toadster

Post by **Donald** » Fri Oct 12, 2012 7:14 pm

Looks very interesting, although I don't fully understand the shaping, it looks much less direct that OEM

. I'm assuming different exhaust airflow velocity can yield different hp/tq results within the rev range?

Post by **NafemanNathan** » Fri Oct 12, 2012 7:40 pm

Beautiful!

Got one on my list of things to get too (One of the next things actually

).

@ Gordon. Whole bunch of science in it... Longer primaries and 4-1 and all that

Post by **Donald** » Fri Oct 12, 2012 9:39 pm

Can anyone explain it to me? Longer primary vs shorter primary? I'm not entirely sure why you would want a longer route for the gases to travel, unless resonance plays a part?

mercutio · Post by **mercutio** » Fri Oct 12, 2012 10:06 pm

what it does is move power up or down the rev range by tuning the pulses of the gasses that each cylinder produces.
Its all to do with maths and timing the pulses down the exhaust so you can predict the back pulse that effectivly scavenges the gasses from the cylinder bore before the valve closes.
or something like that

Post by **Donald** » Fri Oct 12, 2012 10:09 pm

Thanks merc

resonance!

Post by **vanzep** » Fri Oct 12, 2012 10:28 pm

That Bismoto manifold is a work of art - must have cost you a small fortune

Great work Ferdie

gb-lude · Post by **gb-lude** » Sat Oct 13, 2012 12:04 pm

Pure PORN !!
Even if it didn't make power its a work of art. But it does.
Like said before, Longer primary runners( also quite large) with perfectly calculated length so the pulse of one will pull out the next.

Very very surprised some of u don't know THE bisimoto header!!

Always thought the DC sports wasn't enough for your enginebay!

Post by **Lude-dude** » Sat Oct 13, 2012 1:26 pm

the dc sports is ok, the collector needs modifying but it corrodes less the cheap ones

how much is the bisimoto? not really heard of it either well not for the h22a

Post by **NafemanNathan** » Sat Oct 13, 2012 3:34 pm

£899-£999 before shipping

EDIT: Sorry, meant $'s