Hawk Header Help Please!

[pete]

wish I could find out what if anything is inside the
power bomb / mega bomb....
quite easy to build with a couple of Stainless cones..




..

[Azhule]

Originally Posted by pete

wish I could find out what if anything is inside the
power bomb / mega bomb....
quite easy to build with a couple of Stainless cones..




..

Nothing was inside the "FMF PowerBomb" header on my Kawasaki KLR 650... just an open pipe with an "expansion chamber"...

PowerBomb Header is designed for extra HP/Torque at higher RPMs

MegaBomb Header is designed for more HP/Torque at lower RPMs

[Weldangrind]

Originally Posted by pete

wish I could find out what if anything is inside the
power bomb / mega bomb....
quite easy to build with a couple of Stainless cones..

I can't imagine how I would build a stainless cone in my shop. A slip roller would be one way, but I don't have one (yet).

[pete]

You can buy them... for joining tubes of diffrent dia's
i havn't got a set of rollers for cones that small either..


...

[pete]

Originally Posted by Azhule

Nothing was inside the "FMF PowerBomb" header on my Kawasaki KLR 650... just an open pipe with an "expansion chamber"...

PowerBomb Header is designed for extra HP/Torque at higher RPMs

MegaBomb Header is designed for more HP/Torque at lower RPMs

Thanks
good info...
now just find a good piture of a Mega bomb on a 250cc bike so
I can take a scale of a known size part of the bike then
measure the mega bomb useing that scale...



..

[REBELyell]

Looks like an "anti- reversion chamber" to keep consumed/exhausted gases from re entering the combustion chamber. it has a cone shapped pc inside and directs any unwanted backflow of dead gases to the sides, within the pipe chamber instead of flowing directly back thru the center of the pipe and back into the cylinder during cycles of low pressure. http://wiki.clubcivicquebec.com/imag...on_chamber.jpg

[Ariel Red Hunter]

Originally Posted by blackhawkdown

Thanks for the encouragement hunter! There are so many dam vm 26s out there im having a hard time deciding on that too...these two genuine mikuni vm26s caught my eye although they are spigot mount so i would need a spigot to flange mount but let me know what you fellow bird gang members thing about these two on a hawk!!! They share the same jet types as a banshee i think stock which makes availability almost universal which i like...here they are

www.ebay.com/itm/New-Real-MIKUNI-26MM-carb-VM26-606-ROUND-SLIDE-CARBURETOR-/310776591031?hash=item485bba72b7:g:eUgAAOxy4dNS-Pep&vxp=mtr

http://www.ebay.com/itm/New-Mikuni-R...dWQkWS&vxp=mtr

Some how I missed this, blackhawkdown, my apologies. In my opinion, and if I was buying a carb for the Hawk, I would buy the VM26-8074. And I've got what I think are good reasons. I would never spend money for a carb that does not give me the absolute maximum performance, especially for less than a hundred bucks. This carb uses a cold start jet instead of a butterfly choke in the intake area. So what, do I hear you say? Because the butterfly and the shaft it is mounted on acts as a flow restricter on the intake side. If I'm spending my money, I want the maximum performance I can afford. I don't think the choke assembly really hurts performance until you are above half throttle. But I want it all. Now that's just my opinion. But it is based on working with this carburetors sisters as well as Mikuni's for more than sixty years. I have no opinion on square slide carbs. I only worked with round slide carbs. Like Amals, Dell Ortto's, Bings, Keihins and Mikunis.

[Ariel Red Hunter]

Originally Posted by REBELyell

Looks like an "anti- reversion chamber" to keep consumed/exhausted gases from re entering the combustion chamber. it has a cone shapped pc inside and directs any unwanted backflow of dead gases to the sides, within the pipe chamber instead of flowing directly back thru the center of the pipe and back into the cylinder during cycles of low pressure. http://wiki.clubcivicquebec.com/imag...on_chamber.jpg

Thank you for that link. An "anti-reversion chamber" would be of advantage on an engine tuned for mid-range power and torque. Like on a Hawk. But if you are tuning for maximum power at the upper part of the range, and had an exhaust cam to utilise reversion (to ram raw air-fuel mixture back in the head) then that style of anti-reversion chamber would not be helpful. Perhaps even harmful.