I am planning on building a rwd rear engine fireblade mini. I have been lucky enough to be given a few items which has allowed me to do this project. I am a university student studying mechanical engineering and i am tying this project into my 3rd year dissertation. My project will be on chassis design so i am goin to try an come up with a space frame/chassis for the rear to hold and locate the engine. after lots and lots of research i am just about ready to start/just started lol
as above i was luckily given a few items for free, these include a mini shell with lots of supplies and a 1998 CBR 900RR Fireblade engine with 2k miles on, so fairly new. Alot of those miles where track miles so has been nicely run it, the owner (Girl Friend's dad) said they bike had just start to wear in nicely and getting to peak performance (so should be good for the mini ).
The last few weeks have been abit hectic trying to find a diff, i decided to go with a LSD for all the obvious reasons . After a long hard search and many scrap yards later i managed to aquire a Late model Sierra XR4x4 (2.0 engine) 7" LSD (god damn they are pretty rare and hard to find now lol) with a 3.92:1 ratio. I did alot of reading about LSD and there ratios and seen alot of people on hear talking about ratios and on other BEC sites, and aparently speaking to a family friend who has his own grass track engineering company said this one was meant to be good acceleration but lower top end (which suited my needs perfectly), however after lots of reading an researching it all seemed pointless, and that is because when stripping it down (can been seen further down), you remove the outer anulus gear and dont have the helical gear from the prop shaft, so surely that ratio becomes irrelevant and it doesnt matter what lsd ratio you have ? and that the new ratio is completely down to the 2 sproket sizes attached to the diff and the bike ?? (correct me if im wrong)
any who, this was the pic of the LSD before gettin it back to the garage (will post pics of the taking apart tomoro)
Edited by Sean12, 28 October 2009 - 02:50 PM.