Reverse Gearbox

[Locost #38]

I am trying to get a hold of a reversing box that just reverses the rotational direction of the propshaft I am planning to fit a 1600cc Honda B16B (civic type-r 98) into a type 7 frame. (I know I shuld use the s2000 engine but the regulations prohibits this one!!) I am going to use a dogbox. The B series engines spins backwords as you know. I have tried to contact the sellers of the reverseboxes for motorbike engined cars but they don't think they would hold. we are talking about ca 190bhp and revs of possible 9000rpm. just 160nm torque though. Any creative souls out there? The car is just built for racing!

[Tuna]

[quote=Locost #38]I am trying to get a hold of a reversing box ...[/quote]

I might be making this up, but depending on what you're building, can't you just flip the rear diff over?

[Locost #38]

I know but there is no room....can't change anything on the frame!! (regulations!!)

[rustybin]

I don't know the diff but can you reverse the siding of the crown wheel within the casing?

[Locost #38]

i am Using a english axel with a 105e diffhousing!! maybe you can flip the crownwheel around?

[Incorrigible]

Bolt the flywheel on the other end of the crank


But seriously .....

What sort of rear suspension are you running ??

And what are the regs regarding diffs ??

I would say this is definately the route you should be looking at, If you can't do it, ring quaif

>> Edited by Incorrigible on Wednesday 22 June 10:44

[Locost #38]

The only limitations are that i have to use a live axle of some sort and four links and panhard bar.

I am using the English because it simple to maintain and get ratios and lsd and so on....

[SPRITERACER]

I have a feeling i am about to say something incredibly stupid, but what would happen if you just flipped the whole axle over 180 degrees and cut off the mountings for the trailing arms etc and re welded them on so the mounting fitted again?

that would reverse the direction the rear would turn but not change the frame at all, wouldn't it????

[Incorrigible]

Au contrare sprite racer, you're spot on

I didn't realise it was a complete live axle

You may have to arse about with breathers etc but that's your simplest solution I reckon

>> You may need to be carfull about the LSD option as the diff will essentially be running backwards. But this will depend on the sort of LSD you go for

>> Edited by Incorrigible on Wednesday 22 June 15:46

[busa_rush]

It's been done a lot in the past, need to adjust the oil level too.

[Locost #38]

Thanks for that....but i am affraid it is not that simple... If you image the axle from the side you will see that the propshaft flange is situatet well below senter of the diffhousing!! if you know how tight the fit is for a MK frame in normal mode, you have to run the car 20-25 cm off the gound if you flip it to have some sort of clearance.

Don't you creative minds know anyone that can make me a reverseing box?

[Mikey G]

Quaife do a reverse box for the BEC's but these are prone to breaking so most people dont bother, bearing in mind the lack of torque in a bike engine that doesnt stand much for the engineering! so your motor even for a revvy car engine is still going to have too much torque for one of these not to mention they were only designed to be used in reverse occasionally and you will be using it constantly in reverse.

Your best off going to some sort of drive train company to make something up, or maybe get some sort of diff (non lsd) and lock the outer diff casing into some sort of sealed casing for oil to be put in, modify the output's to accept drive flanges that will connect to your propshaft and there you have it a permanent reverse box just make sure you use a diff that is strong enough to withstand it constantly working.

[Locost #38]

That was a good idea that might just work!!

thanks

[busa_rush]

The Quaife box will take at least 250 lb ft when in forward mode (various turbo Dax Rushes have it in) - in that mode it's just a couple of dog rings engaging with no gears to give 1:1 drive so as long as it's got oil in it it should last for years. In reverse there is a small set of gears that come into play and speed is limited to 5 mph and no throttle, just enough to reverse, it's not designed to be run that way for more than simple reversing. It's not quiet either, sounds aweful in reverse.

Can't you just use an engine that turns the right way ?

[Incorrigible]

Any chance of a pic of the Eniglish axle ??

I'm still convinced that adjusting/changing this is the best option

The diff option would work but you'd get quite a bit of transmission loss, it's also going to weigh about 30kg. Also the crown wheel is going to be under twice as much load (I think)

>> not the crown wheel, the box gear stuff in the middle think before posting

>> Edited by Incorrigible on Thursday 23 June 14:05