I helped a couple of friends in the Philippines acquire a Bisimoto B series header thru Exospeed around late December of 04. Wil at Exospeed was great to work with, and did everything he could to send out the header to meet our deadline.

The header arrived and was bolted on the race car. The car was dynoed and the header did perform too well (this was what they told me). The numbers dropped after the bolt-on. After some tuning the numbers were exactly the same as the numbers put out by the motor when it had a DC race header. I tried to acquire a dyno sheet, but they could not retrieve it anymore.

When race day came...the header broke and the evidence is in the pics. They ran it open header, and it broke in a few passes.

I have emailed Wil a month ago and to this day I have had no response from them. I simply wanted to ask them what could be done with this matter, as my friends in the Philippines were very dissappointed.

It wasn't cheap to send out the header ($300+ just to ship I think), and neither was the header itself. A refund or some sort of replacement would be nice, but we are not demanding for it. We just want to see what Bisimoto / Exospeed can do to help us out as customers. We believe in the customer service you guys provide to your fellow racers.

Exospeed, Bisimoto, please respond or provide us some insight on this issue. You can email me and I will forward your messages to the Philippines. We have nothing against you and your companies but we believe we have the right to at least get a response from you. Thanks!

P.S. Anyone else here on H-T experience the same situation with these headers? This is a rare occurrence IMHO.

 

never heard of a header cracking like that.

not even on any of the welds.. just stright on the pipe!

 

Yea i have never seen a header crack like that before

 

damn....yeah first time for me as well.

hope everything works out for ya

 

That's a Bisimoto header? The welds in that first pic look like bird ****.

 

Why are there new welds place on top of the ceramic coating was it modified from its original design?

It doesn't seem to have failed becasue of imporper fab if it was ran "open header" i cant see any particular reason why it would have cracked there especially sicne it's not cracked on the weld

 

That's what they don't get either...the pipe itself seem to have cracked and not on the welds.

 

The weld SHOULD be the strongest part of your piece.... and obviously it was stronger than the place that cracked...which is in the HEAT AFFECTED ZONE.

I do suspect that something else went wrong, like hitting on a bump or something.. but other than that, I'd have to say it was a welding related problem.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Engloid &raquo;</TD></TR><TR><TD CLASS="quote">The weld SHOULD be the strongest part of your piece.... and obviously it was stronger than the place that cracked...which is in the HEAT AFFECTED ZONE.

I do suspect that something else went wrong, like hitting on a bump or something.. but other than that, I'd have to say it was a welding related problem.</TD></TR></TABLE>

beg to differ on the welding portion

 

there seems to be a "ding" right above where it cracked? would this have anything to do with the crack?

i highly doubt it but maybe there is a slight chance?

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by eLusive ek4 &raquo;</TD></TR><TR><TD CLASS="quote">

beg to differ on the welding portion</TD></TR></TABLE>
Don't do that....cause you WILL be wrong.

There's a reason that it's reccomended to use 308 on 304? Cause if you use the proper welding procedures, the weld will be the strongest part of the weld.

You wanna guess where most acceptable tensile pulls break?
In the HEAT AFFECTED ZONE.

 

Well the crack was right below the weld,maybe welder was set to hot and weakened the metal to much?? I am only an ammuture welder so its just a guess.

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by shocker &raquo;</TD></TR><TR><TD CLASS="quote">Well the crack was right below the weld,maybe welder was set to hot and weakened the metal to much?? I am only an ammuture welder so its just a guess.</TD></TR></TABLE>
That is very possible.

Metal changes with heat. Simply taking a torch to a piece of metal and getting it warm will change the metal. Think of molecules..think of heat... heat is basically rapid movement.....which occurs in metals also.

When welding things, certain compounds will boil up and out of the weld, even leaving as a gasseous form. Your filler metals are specifically designed to contain larger amounts of those things that will naturally come out of the metal when it's welded.

Therefore, the heat AFFECTED zone will also lose certain characteristics...but do not have the benefit of having these compounds added back in by filler metal.

Notice the kwy word AFFECTED. It isn't called the heated zone, as the pipe may get warm a foot away, but it is not really AFFECTED in a way that it is permanently changed.

As said, excessive welding heat could have been the problem here in this piece. The weakest link was found...and it was in the heat affected zone.

 

That thing looks like it got crunched first .Then bent back.

 

iv'e never seen a header crack...sounds like u got some defective ****...they sound about right with their theory of the welder getting it to hot...goodluck man

 

God.... hope that will not goin to happened with mine..

 

The header was bolted on a full-race car...and was trailered. So I really doubt it if the car hit a bump that ultimately cracked it.

Thanks guys for the input...I also appreciate the thorough input from SMSP.

Now only if Bisimoto and Exospeed could chime in :/

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by rtzcom &raquo;</TD></TR><TR><TD CLASS="quote">The header was bolted on a full-race car...and was trailered. So I really doubt it if the car hit a bump that ultimately cracked it.

Thanks guys for the input...I also appreciate the thorough input from SMSP.

Now only if Bisimoto and Exospeed could chime in :/</TD></TR></TABLE>

Have you contacted Bisimoto? Hopefully they will back their product.

 

Have you tried calling exospeed?

 

Judging by the welds, it looks like Steve was rushing his work.

 

So who actually produces these headers? Designed by Bisi?

 

Looks to me like like that piece of piping added to the end of the header added too much stress. Maybe it wasn't braced right

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by Karterguy13 &raquo;</TD></TR><TR><TD CLASS="quote">Looks to me like like that piece of piping added to the end of the header added too much stress. Maybe it wasn't braced right</TD></TR></TABLE>

Could be the case...let me ask for more pics and ask for more details.

 

rtz, hmm that header looks very very familiar? h3 autoworks? hahaha


the race car that has the bisimoto headers was trailered all the way from the garage to the strip, so it is impossible that the crack was a result of a bump. the motor was dynoed at 222/155 3 days before the header came. when we installed the header, the HP and TQ peaks were still the same though the graph was smoother than before, and power in the 9000 area was still around 215-220 (peaked at 8500; DC RACE HEADER was the header used before the bisimoto).

it made a pass @ 11.7s in the DC headers before, and made 11.6s with the bisi. we only saw the crack in the bisi AFTER the race!!! when we inspected how it cracked, apparently, it didnt have the bracket to support the header, near the O2 sensor., making more stress in the bended area, resulting to breakage...

we dont know if the design of the header originaly doesnt include the bracket, or if it was forgotten in that order..

 

always got to brace stuff like that.