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Yoshimura oil cooled header!

  • Thread starter Thread starter El Giablo
  • Start date Start date
Billy Ricks said:
I might be wrong but I believe port diameter is different on the GSXR based engines and everything but the '83 and up 700/750E models. I had picked up a GS1100 V&H pipe but the pipe diameter was too large for my ports. Does the GSXR based pipes have slop inside the port? The GSXR based stuff is the same as my 700.
Click to expand...

Billy,
The simple answer is that the port sizes must be close enough (maybe no more than 2-3 mm diameter difference).

My Yoshi 2nd Gen GSXR1100 4:2:1 fits nicely inside the GS1100E as did my Muzzy 4:1 from 1st Gen GSXR1100G (86).

As mentioned it is the flange bolt hole spacing that is smaller on the GSXR with the required modification of replacement of the flanges. Tone's B12 flanges were slotted (as mine were done in that picture) so the pipe can go back and forth between GS and GSXR.

From the measurements on both my 2nd gen 4:2:1 pipe as well as the 1st gen 4:1 pipe if you get the flanges properly configured so that the pipe can bolt up without intereference with the frame, the depth under the belly is not excessive and should work well. The GSXR750 motors have a shorter stroke and probably would not fit the GS1100.

Jim
 
tone said:
Ok here is the post where i eat humble pie :o

Let me explain further, my mate turned up on his gsx11 today as i was in the middle of doing something involving heavy engines & a bad back so as i was busy i only had a quick look at his bike but it seemed that jim is correct & the mounting flange holes on these are a couple of mm further apart than on the b12 or the gsx750 (60/62mm ish)

Once i'd finished what i was doing it started to bug me as i KNOW my b12 exhaust had been on both bikes so i decided to investigate more :) It seems that the holes in the flanges on my exhaust had been filed out to suit the 1100 engine by a previous owner & i had not realised or more likely never looked :o

I appologise unreservedly for my previous incorrect posts on this matter

Normal service will be resumed soon, tone
Click to expand...

You are only providing a free service; Sometimes the memory fails whereas the hand would have been more deadly accurate.

We are glad for your years of experience and willingness to share it. :rolleyes:
 
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