I just got myself B-SERIES Bisimoto headers from John at RS.
They look extremly crazy. Just want to know your opinion about these headers.
You can get a set at <U>exospeed.com</U> . I will post another thread later to let you know the horsepower gains.

Ryan
here is a link by exospeed to see what it looks like
http://www.exospeed.com/engine/Bisimoto.htm

 

Congratulations! and best of luck to you!

 

If its designed by Bisi... then its definately an awsome part

 

and sexy to boot

 

but jeez i only wish it wasnt so dern expensive!!!

 

More bends in exhaust dont exactly mean for the better, yes its equal length, but it really matters where the primaries length is -

Taken from MD @ TI

"It seems to be the latest "craze" or fashion in header design. But does it do anything?

The thinking here is that equal length maintains flow speed for improved scavenging and the timing of the pulse arrival to the merge collector is simpler but when you throw in radius bends like that, you tend to generate more opportunity for turbulence since there is one part of the flow that has a shorter distance to travel than another portion (long radius vs. short radius). You have to wonder if the flow speed suffers in this attempt to equalize the lengths. I've always been told that flow doesn't like bends (especially sharp bends). Gentle bends are nicer on the energy or momentum of flow. Although radiuses look nice and even in cross section and smooth, it's those loops that can be a bit of a fly in the ointment.


The midrange gains may be more of a function of the primaries pairing and tri-Y layout than the snake's nest impersonation.

Certainly when you look at SMSP's or Hytech's race side exit headers, they don't achieve equal length using loops. They try to keep the primaries equal without adding extra sharp detour bends if they can. Even John's turbo manifold on Papadakis' Civic uses sequential pairing and no loops.
They let the diameter steps, secondaries length, and tri-Y maintain the midrange rather than doing this approach.

2 different schools of thought and approach."


Website for more explanations --

http://www.grapeaperacing.com/...s.cfm

 

I heard the header works great!

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Chemicalviper &raquo;</TD></TR><TR><TD CLASS="quote">More bends in exhaust dont exactly mean for the better, yes its equal length, but it really matters where the primaries length is -

Taken from MD @ TI

"It seems to be the latest "craze" or fashion in header design. But does it do anything?

The thinking here is that equal length maintains flow speed for improved scavenging and the timing of the pulse arrival to the merge collector is simpler but when you throw in radius bends like that, you tend to generate more opportunity for turbulence since there is one part of the flow that has a shorter distance to travel than another portion (long radius vs. short radius). You have to wonder if the flow speed suffers in this attempt to equalize the lengths. I've always been told that flow doesn't like bends (especially sharp bends). </TD></TR></TABLE>

I get this question alot, and I have responded on another tread. Below is the response that I had shared. I hope it helps:

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Bisimoto &raquo;</TD></TR><TR><TD CLASS="quote">Greetings all,
I was notified of this post, and quite suprised at some of the comments generated.

The rationale for the bends on my designed header is a follows:

I noticed a given area beneath our vehicles that can assist with the scavaging effects of the header. This was realized with manometer/ pressure differential tests done on my crx, and 2 other civics.

I was pressed to design a unit that could terminate at this area for obvious reasons. I also had the additional challange of an ideal length of header piping to allow optimum exhaust pulse tuning, which was dependant on RPM range, displacement, etc.

My experimentation with fluid dynamic concepts of "flow in pipes" proves that you can achieve the same flowrate and fluid friction in a given stright pipe in one of specified bends if sized properly. In simple terms, a smaller stright pipe flows the same (and experiences the same friction losses) as a calculated "bent" one of larger diameter. There is plenty of scientific documentation on this subject as well.

Hence, this concept is one I use on my own race car to generate ideal HP and torque numbers, with a very simplistic setup: simple carbs, a SOHC, and ignition!

As for the F1 analogy, yes, clearance/aero package may be the reason, but I had compartment constraints as well. In regard to underhood temperatures, I always suggest ceramic coatings...just like on my vehicle.

I am not a businessman trying to sell headers. I am an engineer, scientist, and racer who desires to bring great technology to the masses...at a decent price.

</TD></TR></TABLE>

I will add this response to my website for easier access.

 

without a doubt, John and Dave's designs are great and proven, but i have no doubt that Bisi's work well, also. with a chemical engineering background (not chemistry; it deals with flowing fluids through pipes, etc.), and his results, who can argue? as corny as it sounds, he's like the alchemist of Honda tuning/racing; he takes what most of us consider lead (junk), and makes it work as though it's worth it's weight in gold.

many 'oldschool' V8 guys think that we 'Honda kids' are nuts with our small I4s @ 8K rpm +, but by now they have to respect that many of our 'Jap-crap riceburner econo-boxes' are damned fast (as well as reliable and efficient), and likewise, to many of us convinced that the B and K series' are IT for Honda performance platforms, it's great to have people like Bisi showing us differently.

 

I have been dealing with Bisi for a while. I also have one of his headers for my SOHC. Here is a pic. It has been coated in porcelain.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sobe_Death &raquo;</TD></TR><TR><TD CLASS="quote">but jeez i only wish it wasnt so dern expensive!!!</TD></TR></TABLE>

Expensive? You haven't done your homework on the prices of the majority of all out performance headers on the market. I can other headers that are much more expensive. Bisi's low price is another reason why his header is so great. What do you expect to pay? DC sports prices for a Bisimoto header?

And to the guy who made this post, do a search on the header, its been talked about a lot.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by allmotor7642 &raquo;</TD></TR><TR><TD CLASS="quote">I have been dealing with Bisi for a while. I also have one of his headers for my SOHC. Here is a pic. It has been coated in porcelain.

</TD></TR></TABLE>

sok doukomo te da de procelain!!!!!

 

^^^ awesome looking header.

I kno i woulnt have anything else but this header under my hood..

 

no f22 application though? what's up with that...

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JaeOne3345 &raquo;</TD></TR><TR><TD CLASS="quote">

Expensive? You haven't done your homework on the prices of the majority of all out performance headers on the market. I can other headers that are much more expensive. Bisi's low price is another reason why his header is so great. What do you expect to pay? DC sports prices for a Bisimoto header?

And to the guy who made this post, do a search on the header, its been talked about a lot.
</TD></TR></TABLE>

actually, if i knew all the math like Bisi does, i could get a header of that sort made locally for $100-$200 more. IF i knew the math. i had a "DC type" header made for a buddy(witha b18c) for $150. compare that to $400+ for the DC, and you will see what im talking about.

oh, and i have been watching all the talk about the header, just on a single cam board. ive been hearing about it since it started selling.

*EDIT* if you werent talking about me, i apologize!!

 

thanks for the replies.
nice d series BISIMOTO headers in black Allmotor7642.
looks really clean.

 

I likee.

I think Bisi backs it up with the numbers and research man. I would stand behind anything that guy puts on his cars.

 

i loved my bisimoto header but it broke

 

so weld that thing back together!!! easy peasy

 

Still waiting for my bisi header from exospeed. Soon i hope Anxious

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by TSRperf &raquo;</TD></TR><TR><TD CLASS="quote">Still waiting for my bisi header from exospeed. Soon i hope Anxious</TD></TR></TABLE>

congrats dude, let us know what you think of it as soon as you get it, i personally dont have ne experience with a bisi header, but i hear great things, you should be pleased.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Sobe_Death &raquo;</TD></TR><TR><TD CLASS="quote"> actually, if i knew all the math like Bisi does, i could get a header of that sort made locally for $100-$200 more. IF i knew the math. </TD></TR></TABLE>

you could start by spending upwards of $500 on engine analyzer pro... then give it a full set of flowbench numbers for the heads and throttle bodies, and get somebody with a whole bunch of experience to look real hard at the resulting camshaft and header specs.

you could end up running real hard with it... in fact, i saw don brown set an all-motor record with just that approach... he never even put the motor on a dyno.

of course, the guy with the software had already run about half a million engine combos thru it in the last decade, and he'd also been porting heads for maybe the last 30 years :-)

it's a lot easier for those of us who live in the real world to pay for that level of expertise... so you should always pick a tuner and stick with him... bisi, erick, whoever... the same dyno keeps the results relevant.

i say pay bisi for that header, it would be a steal at twice the $$$... because the advice you get with it is priceless.

 

i been wondering some time about buying this header,the only thing that i want to know is ,do i have to remove the power steering and a/c to use the street version on a 95 ex coupe.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by robtec &raquo;</TD></TR><TR><TD CLASS="quote">i been wondering some time about buying this header,the only thing that i want to know is ,do i have to remove the power steering and a/c to use the street version on a 95 ex coupe. </TD></TR></TABLE>

It wont clear the P/S or A/C.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by evilxkid &raquo;</TD></TR><TR><TD CLASS="quote">i loved my bisimoto header but it broke </TD></TR></TABLE>
what hapened to yours?
my uncoated version was so easy to get rusty , it still about a month since i bought it... i'll pict it soon