Madb Posted January 12, 2017 Share Posted January 12, 2017 How bad are the 1100 cases? I see you have three that match. Good start. Pastigauge will be your best friend. Quote Link to comment
bluedog59 Posted January 12, 2017 Share Posted January 12, 2017 Sorry to put a spanner in the works guys but, GSXR1100wp. Big end journal 41mm. Crank pin 39.9mm. GSXR750wr. Big end journal 37mm. Crank pin 33.9mm. Figures from Factory manual. 1 Quote Link to comment
Madb Posted January 12, 2017 Share Posted January 12, 2017 Thats what i wanted to know. Bugger! New crankcases then. Grrrr. 4mm too big. Maybe bore 750 case out to 1100 size but i expect be much cheaper to get second hand 1100 cases? Quote Link to comment
mrgreen98ski Posted January 12, 2017 Author Share Posted January 12, 2017 I got the 96 model. I believe that's the WT model. GSXR1100WT Quote Link to comment
bluedog59 Posted January 12, 2017 Share Posted January 12, 2017 I wouldn't have thought they would have changed the journal size on such a short "model life" engine. Quote Link to comment
mrgreen98ski Posted January 12, 2017 Author Share Posted January 12, 2017 (edited) I would assume the same. Case is going to be hard to find I would think. didn't see any on Eblag. Edited January 12, 2017 by mrgreen98ski Quote Link to comment
mrgreen98ski Posted January 12, 2017 Author Share Posted January 12, 2017 what if a guy used the 750 bottom w/ crank and the 1100 top? I know Madb said that the 750 gear box would hold up to the torque. I am just trying to work with what I got at home with minimal purchases. I have the 1994 750 motor and a 1996 1100 motor. crack in cylinder wall on 750 and crack in 1100 case. any ideas? Quote Link to comment
Madb Posted January 12, 2017 Share Posted January 12, 2017 (edited) Cheapest option would to source another barrel and matching pistons for 750. Use that till you can source 1100 casings. Or have 1100 casings welded? Edited January 12, 2017 by Madb Missed words Quote Link to comment
mrgreen98ski Posted January 12, 2017 Author Share Posted January 12, 2017 on a 900/750 what all is used. the whole rf900 but the head? Quote Link to comment
wombat258 Posted January 13, 2017 Share Posted January 13, 2017 21 hours ago, bluedog59 said: Sorry to put a spanner in the works guys but, GSXR1100wp. Big end journal 41mm. Crank pin 39.9mm. GSXR750wr. Big end journal 37mm. Crank pin 33.9mm. Figures from Factory manual. Main bearing diameters are the same between 1100 and 750. Crankpins are matched to conrods, so 1100 rods must be used with 1100 crank, and 750 rods must be used with 750 crank. You have to transplant all the 1100 gear in the crankcases to the 750 crankcase to use them. Done it, raced it, no problems. 2 Quote Link to comment
Madb Posted January 13, 2017 Share Posted January 13, 2017 Cool. So mains are the same thro the range. Brill. Thought bluedog59 were refering to mains!. I new the big end were different on the 900/1100. So still a go on swaping internals from 1100 to 750 casings. Yay! Quote Link to comment
bluedog59 Posted January 13, 2017 Share Posted January 13, 2017 So what combo did you run ? 750 runs 18mm piston pin 1100 runs 20mm piston pin. Quote Link to comment
Madb Posted January 13, 2017 Share Posted January 13, 2017 14 hours ago, mrgreen98ski said: on a 900/750 what all is used. the whole rf900 but the head? If you use the rf900 engine then its just means using the 750 head on the 900. But do use rf900 head and base gaskets. Quote Link to comment
Madb Posted January 13, 2017 Share Posted January 13, 2017 (edited) 6 minutes ago, bluedog59 said: So what combo did you run ? 750 runs 18mm piston pin 1100 runs 20mm piston pin. 1100 crank rods and pistons with the 1100 gearbox and clutch. Just swap everything over to 750 cases. Edited January 13, 2017 by Madb Spelling. !! Quote Link to comment
bluedog59 Posted January 13, 2017 Share Posted January 13, 2017 I see. I'm using a 750 in the frame I'm making but have both so I was curious about what combo's I could do in the future. I'm using the 1100 sump and hoping to convert to 1100 hydraulic clutch to tidy up having a cable hanging out in the breeze. 1 Quote Link to comment
mrgreen98ski Posted January 13, 2017 Author Share Posted January 13, 2017 I was wondering about that last night when I was comparing both manuals from 750 manual Quote Link to comment
mrgreen98ski Posted January 13, 2017 Author Share Posted January 13, 2017 from 1100 manual 1 Quote Link to comment
Madb Posted January 13, 2017 Share Posted January 13, 2017 ^^^ i like that alot ^^^ Quote Link to comment
mrgreen98ski Posted January 13, 2017 Author Share Posted January 13, 2017 Me too! building an adapter for the gsxr motor to go on my engine stand now! 1 Quote Link to comment
mrgreen98ski Posted January 13, 2017 Author Share Posted January 13, 2017 Manual is printed (boss may not like that I did it at work ) Quote Link to comment
Madb Posted January 14, 2017 Share Posted January 14, 2017 (edited) That looks like a proper read! Edited January 14, 2017 by Madb I'm a mistake!! 1 Quote Link to comment
mrgreen98ski Posted January 16, 2017 Author Share Posted January 16, 2017 750 is tore down and the 1100 is out of the bike. On 1/14/2017 at 5:59 AM, Madb said: That looks like a proper read! the types of read that will hold my attention Quote Link to comment
FJD Posted January 20, 2017 Share Posted January 20, 2017 so - are the crankshafts interchangable between 750&1100 cases ? Quote Link to comment
Madb Posted January 20, 2017 Share Posted January 20, 2017 1 hour ago, FJD said: so - are the crankshafts interchangable between 750&1100 cases ? Yep! It seems so. Just make sure you match up your main bearing shells. Just waiting on comformation from mrgreen98ski. Quote Link to comment
mrgreen98ski Posted January 20, 2017 Author Share Posted January 20, 2017 I'll be tearing the 1100 apart this weekend. According to wombat258 and the comparing between the 2 manuals it appears possible. 1 Quote Link to comment
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