Mainly because we want 5- or 6-speed sequential gearboxes which allow us clutchless gearchanges in less than half a second!!

If you have ever driven one ( a road car or race car with a sequential, dog-engagement gearbox) they are just freaking awesome!

Spending a month or so nutting out how I can get a reverse in there that the ginger-beer will approve, is a very small price to pay!!!!

I think Matt et al will agree with me......

Cheers,
Tricky

_________________
"Not Speeding Officer..........Qualifying"

I totally agree with you there mate,

my idea doesn't involve using the car clutch.. its completely taken off and the driven sprocket installed directly to the layshaft of the gearbox.
This way we can get rid all the other forward gears and reduce size, weight of the unit.
You would only have essentially 2 gears, one forward and one reverse. you would have to come to neutral on the bike gearbox and the car has to stationary and you flick it to reverse and then i suppose you got 6 reverse gears! you will still use the bike clutch, hence we still got sequential shift

I had a similar thought but wouldn't use a manual box, the guts of an auto may well yield sufficient epicyclic gear sets and clutches to have a straight through box with forward and reverse. With a straight through arrangment, there would be no power loss in forward.

You'd need to make a box to hold all the bits together. That is the expensive part.

Anyone got a drawing of the guts of say a commodore auto?

M

I guess you are planning on a front engine RWD so commodore would be ok.

I want a FWD gearbox since I am going the mid mounted route. the casing can be reused, otherwise you might as just buy one of those custom made boxes and save yourself the trouble

All plausible solutions I am sure.

The way Matt and I have been thinking about reverse, is we will use a car starter motor directly coupled to the primary output cog on the gearbox, via a flexible coupling and one way bearing, or flexible coupling and magnetic coupling (similar to A/C condensor).

So, by using neutral as an electrical lockout, the magnietic coupling and power to the motor would not be engaged until neutral was activated. Once activated, you push a button on the dash to engage the motor and coupling and voila, reverse!!

This should leave everything nice and compact with no complicatiions around the diff area.

_________________
"Not Speeding Officer..........Qualifying"

electrical lockout mech should be on set up the clutch lever,,, that way we can do reverse motorkhana events leaving the bike engine in gear, ready to take off once the reverse bit is over & done with, , no stuffing around engaging gears in the middle of a front throw or reverse flick



Edit--> & no, we`re sorting ours out as a rear/mid engine layout,,, east-west

Maybe if/when we`re rich enough we might look at ordering one of those sooper yoo-beauty mech revers boxes with slippery diff already inside

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

Why not use a prop shaft bike setup like from a BMW and connect it to a diff?

is this going to be a track weapon or street legal?

A street-legal track weapon!

_________________
"Not Speeding Officer..........Qualifying"

Are you planning on running a diff or a spool in the back of it?
Im really interested in this, basically a big version of what we make in the uni motorsport team.

_________________
Simplify and add lightness

Basically running a full chain drive LSD in the back with inboard discs.

Most likely a diff from Quaiffe or TRE,

Price will dictate the eventual outcome I would think.

Cheers,
Trciky and Matt.

_________________
"Not Speeding Officer..........Qualifying"

hee hee,,, i like that trickster

_________________
No offence intended here but--> anyone writing a book about minis 30 years ago may not have experienced such worn or stuffed-with components as we are finding these days.

You should put your heart & soul into everything you do.

I've been chatting with the engineer some more and it seems like the mechanical reverse gear rule can be bent somewhat. We should be able to get away with an electric starter motor. He said all requirements state is that the driver has to be able to engage reverse in normal position while engine is running.
This can be achieved with a starter motor

He told me to check out how the aussie race cars do the reserve in their machines.. assuming they have reverse gear?

Tricky/Matt, you guys would know about this I suppose? I am not into motor sport at all

here's a little something from the eastern most state of australia.....

http://www.oldschool.co.nz/phpbb/viewto ... 17&t=17181

food for thought...!?

niceeee....

I think a lot of people are doing similar things for engine at front RWD projects. I still want to see someone have a go with the fwd gearbox and use a chain drive..
maybe it will be too big to fit it at the back... maybe