drift trike ;-)

[mymumisaman]

Hello im sort of new , been here once b4 lol im building a drift trike , got a Honda gx 240 engine for free lol but..... It has a 6 to 1 gear reduction and a 25 mm output shaft !!....
Im gonna have to put a jack shaft with a clutch setup just to get it moving , but was wondering what ideas ppl have on how to tighten up the final drive chain, when It gets slack? Iv got a few ideas but always handy to ask

 

[redsox985]

The motor has a 6:1 internal reduciton? Like one of the side-mounted boxes attached to the case?

I don't know if those have an internal clutch or just gear reductions, but if it doesn't, you won't be able to put a clutch of any type on the 1" output shaft, as it won't spin fast enough post-reduction to engage the clutch.

One of the easiest methods for tightening the chain is to either slot the motor mount plate where the bolts go through or to make the entire motor mount a clamp style mount and slide on frame rails.

Finally, let's get some pictures of this motor!

 

[mymumisaman]

Yeah it's an internal fixed reduction ( with cogs) engine off a generator , il post pics eventually , I went off the assumption that engine runs max 6000 rpm , so im putting on a jackshaft to increase the rpm for the clutch , got a 56 tooth on engine running to a 18 tooth on jackshaft, should engage the clutch nicely , but not sure what to do for final drive though .... Think the torque on a 1 to 1 ratio might be too much for the clutch , so got a 40 tooth sprocket to go with the 14 on the clutch just incase.

Engine 6-1 ... 56t to 18t jackshaft with clutch 14t to 40t wheel

Im toying with the idea of the slider on the engine mount , made some drawings it will work nicely but im open to any simpler ideas .

Also do u know if that one way push bike sprocket idea worked ? Instead of using a diff? Iv got 4 on order so gonna make some hubs for my wheels works out cheaper than any diff.

 

[OzFab]

A Honda GX240 maxes out at 3600rpm, not 6000...

Now, double check that the redux doesn't have a clutch; if it does, it's gold; if it doesn't, the best idea is to swap it for one without the redux...

Another thought is get yourself a DBR clutch

About the only part of a bicycle that can be used on a powered trike is the handlebars; sprockets, chains, etc aren't designed to handle that much torque...

 

[mymumisaman]

I can assure you the engine has no clutch , and where could I swap it for free in the UK? (im skint lol )
And where can I get that clutch? Seen them b4 but there was never a way to get hold of one ...

And I understand where ur comming from with the push bike one way sprockets but it never hurt to try , lol ready.... Set......oh ...

 

[landuse]

Welcome back

 

[mymumisaman]

Oh and is that 3600 rpm with or without governor? Iv taken mine off hence the assumed 6000

 

[OzFab]

Ah ok, 3600 is governed speed; ungoverned with stock springs you should get around 5000 (ballpark) RPM...

I didn't exactly mean swap it (although, if you can manage it...), more like sell it & find one without a redux box or, if possible, simply remove the box...

 

[mymumisaman]

Lol iv tried to sell it b4 but no one wants it lol , most I could get is £50 which to be honest isn't worth selling it for that price lol , as to the gear reduction , it's part of the engine casing , with an oil feed from the crank , all that's their is the short output from crank which has a cog going to the main
output shaft, would cost about the same as a new engine to convert it lmao , so only option is to either make a manual clutch ( which I could do ) or jack shaft it with a centrifugal clutch , iv just about got everything I need to sort it , just trial and error , have a play and see what I can get to work lol

As to engine mods , all iv done so far is de governed it , but hope to upgrade the valve springs, make a new exhaust ,and fit a mikuni carb iv got knocking about, oh which reminds me anyone made a quieter exhaust? Gonna try and make a free flow exhaust but try and reduce noise ..... Should be interesting lol but 1st things 1st need to get a clutch sorted .

 

[OzFab]

Valve springs should be the last mod, after the billet conrod & flywheel...

Removing the governor means that valve bounce becomes your new governor, usually kicking in at around 5-6000rpm, which is about all the conrod can handle before self destructing... There are plent of other mods that can be done before reaching that stage...

 

[mymumisaman]

Ahh fair enough , lol iv played around with a gx160 clone in the past but never touched the internals , just the usual ,valves, degoven, head polishing, carb, exhaust, and plastic fan mods , to be honest im quite happy with the engine as standard but u know how it is .... Eventually u get the itch to play with it lol

 

[mymumisaman]

Ok quick bump with a new question , lol , im trying to figure out my ratios for setting up the sprockets , managed to sort my jackshaft so the 6-1 reduction on the engine is neutralized .

Im wanting to run 14 inch wheels and the trike shouldn't be more than 200kg with me on it , the engine is the gx240 with 9hp
59 t from engine to 10t on jackshaft
Jackshaft has 1" bore centrifugal clutch ( don't ask what clutch lol I dunno )
14t from clutch , now this is the bit im stuck on ..... Iv got a 18t 24t 40t and a 56t sprocket I can use ,I can also use any one of them on the jackshaft to reduce the ratio from the engine ( im thinking it could increase torque maybe ? )
But im thinking the weak point is gonna be the clutch , it might slip , but shouldn't .... Im scratching my head trying to figure out what to go for so any help will help lol .

 

[OzFab]

As stated previously, your biggest problem will be getting the clutch to engage & lock; even on the cheapest clutch, engagement speed is around 1500rpm & lock speed of around 2200rpm...

Now, with a 6:1 reduction on the engine, that means your engine will have to run at 9000rpm just to engage & 13,200rpm to lock; that's not gonna happen!

So, your plan is to reverse the redux before the clutch, then reverse it again to achieve the necessary gearing to drive the kart? I over analyse & over engineer everything & that seems like a lot of work & moving parts for nothing, even to me...

We still haven't seen any pics of the engine in question...

 

[mymumisaman]

Eh?....

Ok lets say my engine runs at 3000 rpm , with the 6-1 box it kicks out 500 on the shaft. The shaft has a 59 tooth sprocket which runs to a 10 tooth on a jackshaft, this turns the 500 rpm into just under 3000 rpm at the jackshaft, the clutch on the jackshaft
Im trying to figure out roughly what ratio the clutch can handle iv changed the spring so it engages and locks at lower rpm ( 1/4 throttle )
My problem is what ratio can I run the clutch to the axle ?
Im thinking because of the reduction on the engine , the torque produced going to the clutch is higher therefore it should be able to handle a bigger load than normal ?

Il get some pics later today after work ..