Realistic 750cc conversion?

[veefer400]

Why not just buy a VFR750?

Seems like an awful lot of work to me :S

Vfr800 and fit an A&A kit? 140bhp or something like that. Sounds fun!

I have a VFR800 VTEC, they kick out 105bhp +/-, big fun when the VTEC cuts in and they go from 8 valve to 16!
They are quick - but heavy, and the handling is slow and best preplanned... the lump in a '30 or a '35 would be fun tho!

Buy a cheap front-ender and swap all the gubbin's over??

[Neosophist]

Why not just buy a VFR750?

Seems like an awful lot of work to me :S

Vfr800 and fit an A&A kit? 140bhp or something like that. Sounds fun!

I have a VFR800 VTEC, they kick out 105bhp +/-, big fun when the VTEC cuts in and they go from 8 valve to 16!
They are quick - but heavy, and the handling is slow and best preplanned... the lump in a '30 or a '35 would be fun tho!

Buy a cheap front-ender and swap all the gubbin's over??

I don't think it'd work, but i'd like to have a go on one.

Putting in all that extra power might need the frame strengthening, possibly a wider rear too for more traction.. by the time you've plumbed it in etc you've turned it into an 800 anyway

I like the way the 400's handle, i think some of that is due to (lack) of insane power.. they never have enough to ruin things.. cracking the throttle in a corner wont flip you over like it would on a newer blade etc.

Still I think it'd be a hell of a project.

The best one i've seen recently was a ZXR400 (few years ago now) that had a 893 fireblade engine installed in it.. the engine is almost the same size as the 400 lump and the bike looked totally stock... i recall reading it broke the frame until it was re-strenthened.

Quite possibly still on the road.

Plus you'd loose the 360 firing order which makes the NC30 sound what it is with the 750 / 800 upgrade.

I still think turbo / nitrous is the way to go :D

[CMSMJ1]

supercharging is the way to go..

Or even just spooling the turbo off 2 exhaust pipes but blowing all the pots...I see the main isue with turbo is where to get the gas from on a V4... but running it from the front pipes might be simple enough...

it would be impressive indeed to have a 90bhp 400 - but then you need the G force cranks and new gearboxes as they have shown to be a weak link.

Getting weight off the bike is a great goal - like Ronni and Lasse have done..must be something in the nordic water!

[Drunkn Munky]

What we need is more little workers in the Durhban garage milling special TI parts for our wee V4's. Id kill for one of them TI rear axles and waiting in anticipation for micheal to perfect his FI.

I really think its about time the 400 GB crew cracked this 750 lump in a 400 tho, it would make a killer no budget cup bike.

[CMSMJ1]

What we need is more little workers in the Durhban garage milling special TI parts for our wee V4's. Id kill for one of them TI rear axles and waiting in anticipation for micheal to perfect his FI.

I really think its about time the 400 GB crew cracked this 750 lump in a 400 tho, it would make a killer no budget cup bike.

Would not be legal though - has to have kosher frame and engine refs

[Drunkn Munky]

Really what's the deal with the 600 powered fzr 400 that runs in 600 class? See it in mcn this week

[veefer400]

Supercharging AND turbocharging would give you the best of both worlds....

This beast was at last years NEC show...
http://i109.photobucket.com/albums/n61/ ... C03369.jpg
VTR1000 engine, turbocharged -

http://i109.photobucket.com/albums/n61/ ... C03371.jpg

AND supercharged! I DO know that I want one...

[CMSMJ1]

Really what's the deal with the 600 powered fzr 400 that runs in 600 class? See it in mcn this week

Hmm - I have re read the details..

"All competing No Budget CUP bikes must be based on road production models, and pass a static noise test of 100 dB."

"There are no restrictions to engine tuning and suspension changes, the only rule is that both the engine and the
frame have to be from a bike made between 1990 and 2000 inclusive."

Looking at that, the letter of the rules has it that a Hybrid would do very well...depends if by road based they mean a model that was sold and includes the basic spec of it?? Seeing as no 600cc FZR 3TJ were ever sold...??

ZX7r with a 9r motor....
3TJ with a foxeye (wish I never sold mine...)
YZF with an Exup motor...

[firebeast]

i spoke to soneone years ago who was selling his in mcn,it went well but was loads of problems getting it in including slicing bits of the frame,made my blade engine 23 sound relatively easy.then he said he looked at the tl lump and reckloned that was the way to go.you will always need to strengthen with a cross rail inside to make sure it wil take it,but i have posted this before and said the tl 1000 engine would probably be the most crazy one out there and a bit different.booming twin in tiny chassis equals BIG laughs!!major work needed on the sussies required as always.
i have seen a loty of 4's done and tbh i have a 750fs and would love to try it in a 4 but its one heavy lump and doubt you would get the 8's fi to fit properly without moving where you store some of the fuel.the extra weight will slow down the handling but the grunt will more than make up for it.the work from memory is cutting the front spars off,taking sections out from the inside to get it lined up on the sprocket,then maybe it was bottom mounts moved if needed before even getting the carbs in.they were a major job to get sealed and then it was either mod the airbox or think he may have made a new one up and taken some of the tank away as well,plus had to raise it a little.after that came the pipes which again sounded like the rear were another bastard,lol.these sort of projects nearly always throw more up than you can think of but since it was done years ago before the net,it may be people have access to better techniques and materials etc to help the build.they had the 750 rear on.just a quick note,i fitted nc29 carb needles and its goes better in the midrange with them in.better taper.

[Giffin101]

Supercharging/Turbocharging is impractical and very expensive.

Does anyone know the weights of the 750 and 400 lumps?