GSXR4814
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Posts posted by GSXR4814
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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?
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Getting the machining work done for this over the next couple of weeks.!!
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Whats not to like....sounds brilliant
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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
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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
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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.
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Ok cool. I will source one locally.
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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?
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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!!!
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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!!!
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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?
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Cool, it should all fly together then!
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I've got GSXR 750 slabbie 34mm sort of semi flatslide things(i ought to find out exactly what they are really) to try on mine.....when i eventually finish getting it back together!
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On 6/13/2019 at 9:34 AM, Lachie04 said:
Yep I've built one I used a GXF bottom end and a dot head barrel.
Primarily just cause I could as had the parts around
I have set it up pretty standard (meaning no real high performance options) for roadability and a general daily rider done around 4000 k atm and loving it really trackable
But has performed well on the track only losing the liter bikes down the straight.
Bearing in mind the result is only 60 odd cc's there's no real power advantage in standard trim like mine and pulls @ 100hp at the rearwheel and max torque comes in at @ 8000
the advantage is how it is setup to bring on the torque but if your going after power there's other options higher lift cams and stuff to suit.
The only hard thing is to bore out the rod little ends an extra 1mm in diameter for me this resulted in only a 0.3mm reduction in meat on the end
A spacer plate can be made or bought from here (see bottom of page) http://gsxrzone.com/cranks.html but they make them to order.
and changing over the cam sprokets to suit the Hyvo Chain and using the long stroke chain slippers
mine ended up with taking a link out of the cam chain also but I hadn't heard of that before in other builds
This is an earlier run and going a little better after some more jetting changes
What carbs do you run?
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I'm putting one of these back together at the moment.
It was given to me by a nice bloke in Barnsley last month.
It was a Bandit 600 cases, crank and rods with late gsx750 70mm pistons and barrels making it a 750.
I have early 73mm barrels and pistons on the way to make it 814cc.
Having read through the interchangability thread re oil burner motors it seems the little ends are different diametres or am i reading it wrong???
If they are different diametres are there compatible rods available or is getting the original Bandit rods machined the only option?
Gsxr750 hybrid engine info required
in Oil Cooled
Posted
Thanks boss