Jump to content
Gammaboy

GSXR1100W and Bandit 1250 interchangeability

Recommended Posts

Yeah, I'm going to be doing this.

Is time (y)

In true faith,  Boilers should be liberated..

This is a contentious issue for this site.

@ mods

Are we breaking the MFRules?

 

 

  • Like 1

Share this post


Link to post
On 5/25/2019 at 10:53 AM, Cheeky4648 said:

@Gammaboyon Sunday or Monday I can give you measurements of block and head for 1250 if you need things like stud spacing and block height etc. 

1250 crank won’t fit 1100. The rod bearings are the same but mains are smaller. Also crank gear is much larger. 

Smaller mains *might* work with 750 cases - I believe the 1100 and RF900 shared main sizes, but the 750s are smaller... Primary gear size is probably the killer though. Sealing issues at the front of the cam chain tunnel would be a pain, but not insurmountable if you look at what they do to put gsxr heads on GSXs

Starting to sound like a big bored 1100 is the only answer for me at some point in the future - pity, 1250 engines are pretty cheap down here, and a 1250cc SB6 wouldn't wear front tyres out very often.

  • Like 1

Share this post


Link to post
9 hours ago, Gammaboy said:

Smaller mains *might* work with 750 cases - I believe the 1100 and RF900 shared main sizes, but the 750s are smaller... Primary gear size is probably the killer though. Sealing issues at the front of the cam chain tunnel would be a pain, but not insurmountable if you look at what they do to put gsxr heads on GSXs

Agree with you on the above  

Starting to sound like a big bored 1100 is the only answer for me at some point in the future - pity, 1250 engines are pretty cheap down here, and a 1250cc SB6 wouldn't wear front tyres out very often.

Widest point on the cylinder head is 16 1/2 inches so you may be able to shoehorn a 1250 in somehow. I’ve taken mine out to 1316cc  

 

Share this post


Link to post

I am starting to think that GSF barrels and head will not go on W bottom end, Stroke on the W crank is a long way out.

:/

 

Share this post


Link to post

I think the problem with shoe-horning a 1250 into the Bimota is the clutch cover, not the cilinder head

  • Like 1

Share this post


Link to post

:lol: that is definitely what this forum and angle grinders are for.

  • Like 1

Share this post


Link to post
2 hours ago, markfoggy said:

I am starting to think that GSF barrels and head will not go on W bottom end, Stroke on the W crank is a long way out.

:/

 

Only 4mm difference. Not insurmountable. 

Share this post


Link to post

Yeah, fine if you aren't looking at a water jacket.

Hmmm, I think it's going to be 5,  It's not a stopper.

I don't have cash to throw at this and buy both engines.

Don't say any more or we'll end up in an Arms Race.

You know that if we unravel how to build a cheap 150hp motor the prices will go through the roof.

:pimp:

  • Like 1

Share this post


Link to post
18 minutes ago, markfoggy said:

I have cash to throw at this and buy both engines.

:pimp:

Helped you abit there, now we are curious about if it's even doable.

And you seem most qualified for the task............ is it working.:ph34r:

Share this post


Link to post

I want it to work, but is No.

I will have to go, GSF and stop with ideas about W comparability. 

Is so close that I can smell it, but it just does not quite go..

Looks like I will only get to engine plates in the winter.

I have another frame so that can get cut to get the engine in.

I need to get my focus back on rolling chassis.

rfVJV0Bl.jpg

I need to get this shit working first

 

 

  • Like 1

Share this post


Link to post
9 hours ago, Captain Chaos said:

I think the problem with shoe-horning a 1250 into the Bimota is the clutch cover, not the cilinder head

Clutch cover and cylinder head - there's no mounting points to hag the engine from (and yes, the very first SB6s used WN heads with no head steady point, but they at least had the oil gallery blanking plugs to use).

  • Like 1

Share this post


Link to post
Posted (edited)
On 5/26/2019 at 4:38 AM, Gammaboy said:

Smaller mains *might* work with 750 cases - I believe the 1100 and RF900 shared main sizes, but the 750s are smaller... Primary gear size is probably the killer though. Sealing issues at the front of the cam chain tunnel would be a pain, but not insurmountable if you look at what they do to put gsxr heads on GSXs

Starting to sound like a big bored 1100 is the only answer for me at some point in the future - pity, 1250 engines are pretty cheap down here, and a 1250cc SB6 wouldn't wear front tyres out very often.

the mains shells on all the w/c motors from 600cc to 1100cc are the same. the big end shells are different, tho.(y)

the clutches only match the the engine cc they came out of  as the outer gear to crank gear very in size.

 

Edited by Madb

Share this post


Link to post
14 hours ago, Madb said:

the mains shells on all the w/c motors from 600cc to 1100cc are the same. the big end shells are different, tho.(y)

the clutches only match the the engine cc they came out of  as the outer gear to crank gear very in size. 

  

That'll teach me to rely on memory and not look at the parts fische.

Hmmmm. wonder if one of the variety of clutch gears would work with the 1250 primary. Have seen inserts used to allow smaller mains fitted in car engines (putting 351C cranks in 351W blocks to give a taller deck height with the small diameter mains to allow it to rev - back before SVO blocks were a thing), wonder if it could be done sucessfully here?

Share this post


Link to post
Posted (edited)

Just to recap, 1250 barrels will fit on W, but bore is very short.

Blandit 1250 head is tiny ports, but all big valves fit the 1250 head, but W head will not go straight on 1250. 

Rod ends of W have smaller Big end than Busa, so could be possible with an as yet undisclosed rod that would work with  Busa pistons into a GSF top end.

Nothing from  base gasket down looks useful from 1250 world.

I'm now guessing that we would need a long throw crank, but I'm guessing that this doesn't exist even in GSXR world.

Cheeky has sent some pics to me of a 1250 clutch basket. no Mickey M steel bands, that thing looks like it could be amazing. Will certainly never fit in 11 cases, I'm not sure it would go in Busa.

I can't see it working in 1400 either, that just looks like gsxr cases to me.

So...what is going on with that 1400 crank?

 

 

 

Edited by markfoggy
Accuracy

Share this post


Link to post
On 6/2/2019 at 9:05 AM, markfoggy said:

Rod ends of W have smaller Big end than Busa, so could be possible with an as yet undisclosed rod that would work with  Busa pistons into a GSF top end.

 

Any half decent machine shop can rebush the small end down to 18mm. Hell, a good one can offset bush it to tickle the rod length a mm or so.

Share this post


Link to post
Posted (edited)
On 6/3/2019 at 7:59 PM, Gammaboy said:

Any half decent machine shop can rebush the small end down to 18mm. Hell, a good one can offset bush it to tickle the rod length a mm or so.

1100w has same con rod big end as hayabusa no difference in shell part numbers. 

Same shells in 1100gsxr/1200 bandit/ hayabusa and 1250 bandit. 

1250 bandit is already 18mm little end. 

Edited by Cheeky4648

Share this post


Link to post

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • Create New...