markfoggy Posted June 17, 2019 Posted June 17, 2019 So it needs a spacer plate to jack the barrels up, Link above. Does anybody know the rod length for B6 is it common with 12? I am thinking that throwing some other rods at it might be an option. Quote
dupersunc Posted June 17, 2019 Posted June 17, 2019 big ends are different sizes between b12 and b6. likewise 748 short stroke and 749 long stroke big ends are different. Quote
dupersunc Posted June 17, 2019 Posted June 17, 2019 55 minutes ago, GSXR4814 said: Hmmm.....my 73mm barrels and pistons turmed up today. They were listed as 1992 GSX750F. My current 70mm barrels are approx 75mm high...new 73mm ones are 69.5., these dimensions are approx as the battery is flat in my vernier so using a tape measure. Little ends are bigger and centre of little end to top of piston is greater by about 3mm??? Does this sound right? I didn't think 1992 GSX750F was short stroke which these parts seem to be? how do you think they made the 750f 748cc with 3mm larger bore than long stroke 749cc motors... Quote
GSXR4814 Posted June 17, 2019 Posted June 17, 2019 Yes i have realised my idiocy. I will get my tame engineer on the case, shouldn't take much to profile a plate and open out the little ends.... What a nob!!! 1 Quote
SiBag Posted June 17, 2019 Posted June 17, 2019 @GSXR4814 you can get 2mm thick turbo spacer plates of eBlag for about 30 notes. Unless you've got access to laser or water jet.. Quote
dupersunc Posted June 17, 2019 Posted June 17, 2019 you'll need either a short stroke 748 , or any of the big block 1100 heads to go with the 748 block. A long stroke 749 or b6 head won't work as the cam chain tunnels don t match up. Quote
GSXR4814 Posted June 17, 2019 Posted June 17, 2019 I think what i started with was a bandit 600 bottom end, cases, crank and rods with a complete gsxr or maybe gsxf 749 top end, barrels pistons and head, head is rocker and screw type. the plate i cant made cheaply and easily enough, the rods however are not going to be so easy. Anybody know what diametre the little ends are on an RF900 as i see they also have 73mm pistons.....i would assume they would also be bigger but you never know!!! Quote
Lachie04 Posted June 18, 2019 Posted June 18, 2019 RF 900 rods little and big ends are the same as the short stroke rods 19 and 36mm The spacer plate should theoretically be half the increase in stroke (@5.8mm from memory) assemble the motor without base gaskets and check piston to deck height this will be the size of the spacer plate/s/gaskets needed. My mechanic did a top job milling a spacer plate out of 6mm 6061 Al and was set up with zero deck height and no base gaskets. Cometic (I've heard) and Orient express (I asked them they make them to order) also do spacer plates can check by contacting them Quote
Lachie04 Posted June 18, 2019 Posted June 18, 2019 12 hours ago, dupersunc said: you'll need either a short stroke 748 , or any of the big block 1100 heads to go with the 748 block. A long stroke 749 or b6 head won't work as the cam chain tunnels don t match up. And valve cover Quote
GSXR4814 Posted June 18, 2019 Posted June 18, 2019 6 hours ago, Lachie04 said: RF 900 rods little and big ends are the same as the short stroke rods 19 and 36mm The spacer plate should theoretically be half the increase in stroke (@5.8mm from memory) assemble the motor without base gaskets and check piston to deck height this will be the size of the spacer plate/s/gaskets needed. My mechanic did a top job milling a spacer plate out of 6mm 6061 Al and was set up with zero deck height and no base gaskets. Cometic (I've heard) and Orient express (I asked them they make them to order) also do spacer plates can check by contacting them Do you think he fancies making another one? Quote
clivegto Posted June 18, 2019 Posted June 18, 2019 5 hours ago, GSXR4814 said: Do you think he fancies making another one? A friend made one by hand for a turbo yam, said it didn't take that long. Quote
Lachie04 Posted June 19, 2019 Posted June 19, 2019 13 hours ago, GSXR4814 said: Do you think he fancies making another one? Yeah nah I don't think that would happen. I don't even know if he's back at work after spending 2-3 months in Hospital after being rear ended on the track. Your much better off sourcing this locally and or checking with orient express racing they came back to me quickly when I inquired about their spacer plates just takes them about a week to have them made up. Or APE on the link before Otherwise there maybe someone else on here who has done a stroker engine could give you some suggestions Quote
GSXR4814 Posted September 19, 2019 Posted September 19, 2019 On 6/17/2019 at 10:01 PM, dupersunc said: you'll need either a short stroke 748 , or any of the big block 1100 heads to go with the 748 block. A long stroke 749 or b6 head won't work as the cam chain tunnels don t match up. Any idea if they could be modified to fit? I only ask as the 750 one on has been nicely ported etc. Getting ready to start attempting to put mine back together shortly. Quote
GSXR4814 Posted September 19, 2019 Posted September 19, 2019 On 6/19/2019 at 7:06 AM, Lachie04 said: Yeah nah I don't think that would happen. I don't even know if he's back at work after spending 2-3 months in Hospital after being rear ended on the track. Your much better off sourcing this locally and or checking with orient express racing they came back to me quickly when I inquired about their spacer plates just takes them about a week to have them made up. Or APE on the link before Otherwise there maybe someone else on here who has done a stroker engine could give you some suggestions What did you use camchain wise mate? Think i've got all the other pieces of the jigsaw lol Quote
Lachie04 Posted September 19, 2019 Posted September 19, 2019 Used the Hyvo chain as the only option to match the crank Hyvo sprockets slotted and fitted to the 89 Cams. Pretty sure B6 use Hyvo Check tension on the chain as we ended up taking a link out not sure why that happened as I hadn't heard of it before (just one of those things). Quote
dupersunc Posted September 19, 2019 Posted September 19, 2019 9 hours ago, GSXR4814 said: Any idea if they could be modified to fit? I only ask as the 750 one on has been nicely ported etc. Getting ready to start attempting to put mine back together shortly. I hear it's been done. No Idea what is involved though. Quote
Gixer1460 Posted September 20, 2019 Posted September 20, 2019 (edited) On 9/19/2019 at 7:55 AM, GSXR4814 said: Any idea if they could be modified to fit? I only ask as the 750 one on has been nicely ported etc. Sort of related - I built a GSXR head onto GSX barrels and gasket around the chain tunnel was marginal so we welded in some 6mm ali before it got decked to provide the extra real estate for copper gasket. Oh and due to the stroke difference we had to add two extra links to the cam chain - normal roller not Hyvo though! Edited October 8, 2019 by Gixer1460 Quote
GSXR4814 Posted October 8, 2019 Posted October 8, 2019 I assume those that have done this exhausted all lines of enquiery re correct length rods before sticking with the 600 bandit items? I've ruled a few out, but if anyone can add any to the 'doesnt' fit' list that would be handy to save me covering stuff thats already been tried. Ta Quote
trikerdrew Posted October 15, 2019 Posted October 15, 2019 so guys would the rf900 head fit a gsx750f bottom end? any ideas? ta drew Quote
GSXR4814 Posted November 19, 2019 Posted November 19, 2019 Getting the machining work done for this over the next couple of weeks.!! Quote
GSXR4814 Posted November 26, 2019 Posted November 26, 2019 On 6/18/2019 at 10:36 AM, Lachie04 said: RF 900 rods little and big ends are the same as the short stroke rods 19 and 36mm The spacer plate should theoretically be half the increase in stroke (@5.8mm from memory) assemble the motor without base gaskets and check piston to deck height this will be the size of the spacer plate/s/gaskets needed. My mechanic did a top job milling a spacer plate out of 6mm 6061 Al and was set up with zero deck height and no base gaskets. Cometic (I've heard) and Orient express (I asked them they make them to order) also do spacer plates can check by contacting them What cams are you using? Quote
Lachie04 Posted November 27, 2019 Posted November 27, 2019 17 hours ago, GSXR4814 said: What cams are you using? On 9/19/2019 at 9:03 PM, Lachie04 said: Used the Hyvo chain as the only option to match the crank Hyvo sprockets slotted and fitted to the 89 Cams. Pretty sure B6 use Hyvo Check tension on the chain as we ended up taking a link out not sure why that happened as I hadn't heard of it before (just one of those things). Dot head and 89 spec GSXR dot cams with Hyvo sprockets From the notes the initial setup resulted in 105 deg exh and 108deg inlet the inlet sprocket was slotted back to 104 But that could vary project to project as before check check & check everything Quote
GSXR4814 Posted November 27, 2019 Posted November 27, 2019 13 hours ago, Lachie04 said: Dot head and 89 spec GSXR dot cams with Hyvo sprockets From the notes the initial setup resulted in 105 deg exh and 108deg inlet the inlet sprocket was slotted back to 104 But that could vary project to project as before check check & check everything Thanks boss Quote
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