Yoshiumira KZ Exhaust: Measurements anyone????

OK, fouund a calc program for exhaust pipe performance tuning... Based on camshaft BBDC & ATDC & cc...

Also found sevral sites where 1 3/4" pipe CS, SS, or Ti 14 gauge and 4-1 merge collectors are available... Can obtain
Definitely
build in mild steel first then onto the alloys such as stainless or titanium for that crap is high $$$$... :blink:

This may be duable! :woohoo:

a member here or on another site (can't remember) posted an article from a while back about a guy who still does 'sand bending' or something along those lines. He packs the pipes with sand, heats them up and bends them by hand. Looked pretty cool and with practice could probably be as good as a pipe bender. I'll have to see if i can find the article...

I have got one of thse Yoshi pipes that is in the 75 catalogue and i have also got another collector ,i bought them both on ebay last year the pipe came from a member here if you need any measurements just let me know they are just sitting on a shelf waiting for a project to get here from the U.S.

Regards Dale

Old Man Rock wrote:

Hey all,

Found this on the web and if anyone has this pipe, need some measurements for possible re-production....:woohoo:

OMR May be going into the exhaust fab.... :ohmy:

Attachment Yoshiumira_KZ_Exhaust.doc not found

The Holy Graile.
Also comes in chrome.
Liking your more expanded curve headers even better.

Good Luck!

Old Man Rock wrote:

Hey all,

Found this on the web and if anyone has this pipe, need some measurements for possible re-production....:woohoo:

OMR May be going into the exhaust fab.... :ohmy:

Attachment Yoshiumira_KZ_Exhaust.doc not found

More expanded curve headers.

What you folks here call "expanded curve" are in Japan called temage, which stands for "hand bent," meaning the header portions are bent by hand and not manufactured by machinery. These hand bent pipes are much more pricier than the normal machine bent pipes, i.e. the ones with the two 90 degree bends with a length of straight pipe inbetween.

I'd wager there are no exact measurements for the header portion of the handbent pipes, so go ahead and bend away. A nice graceful curve which allows for the smooth flow of gases is what you are looking for.

Thanks for the encouragement guys...

It will be a ways off till I get to this for have a whole slew of other more important crap to do first... Just came across this in a discussion with Plum and thought whoa, that would be totally cool to pull that one off...

Freakin probably cost me more than I could just buy one :blush: but would be sweet just the same...

Ah well more research to go yet... I do like the sand fill bend idea for that would seem to definitely work.... The mandrel uses a inner material that would be pretty much the same concept during the pipe bend, keep the pipe from creasing versus curving/bend...

Hmmmmm.... me wonder! :woohoo: :laugh:

OMR

I've got a near mint Nico Bakker pipe from Holland that I'm trying to find out more info on. Bought it from one of the fine members from here.

I to would like a real Yosh pipe for my arsenal. Along with a Bassani from the era.

Old Man Rock wrote:

Hey all,

Found this on the web and if anyone has this pipe, need some measurements for possible re-production....:woohoo:

OMR May be going into the exhaust fab.... :ohmy:

Attachment Yoshiumira_KZ_Exhaust.doc not found

That is 1 pritty pipe Dave. I love the hand bent look. for me it could only be better if it swept upwards at the end, so it finishes above the rear axle.:woohoo: :woohoo:
Excuse me, i must go dry off now.
I have a spare Yosh pipe myself, not the hand bent type though. unfortunatly , with my wider swingarm, i cant try it out, without modifiing it. there always seems to be somthing higher on my priority list, and the pipe stays at the bottom of the list. If only i could find that money tree.

that hand bent pipe hangs way down below motor,gives up too much ground clearance for me anyway

Yoshimura ( Pops & Fujio days) hand bent the pipes seen on most of their superbikes, especially on the Zuks. The pipe from the catalogue was the street version sold by Yoshimura and Dale Star who owned the Yosh name/product line for a while in the 70's.

Moriwaki had the nicest hand bent pipes for the Z imho.and looked a lot like the one posted by OMR.

Maybe this guy can help you out with some pointers.

www.cb750cafe.com/parts.php?id=70

Oh, and put me down for a pipe if this comes to fruition.