staton 3.11 to 1 small light gearbox

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fireball_jones

Guest
Hello my fellow motored bike enthusiasts. all the way from Wales!
Does anyone have experience with this gearbox?
http://www.staton-inc.com/Details.asp?ProductID=2801
Im looking at using it for a Subaru EHO35 or EHO25 or similar small engine. chain drain counter clock wise or (left hand drive).

this is for use on my folder. which I really recommend.
http://cgi.ebay.co.uk/20-Magnesium-...hZ022QQcategoryZ33503QQtcZphotoQQcmdZViewItem

I would have liked to have used the gebe style kit as its lightweight and super mpg which is what imp after. But as far as I know this cant doesn't work on a 20" wheel but can it be modified?

I appreciate that there are similar threads
e.g. http://www.motoredbikes.com/showthread.php?t=5429&highlight=small+engine+gearbox
and Zomby Builder has a good thread, but they are not compatible.

and advice /ideas? thanks:)

ps good ridin to all those doin the KC bike ride!!!
 
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fireball_jones

Guest
more general

ok 46 veiws... no posts. lets be more general

whats the lightest four stroke engine and gearbox (chain drive) setup out there.

Sorry no friction drive talk i live in wales! we have rain all year round! :cry:
and snow in winter:cry:
 
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fireball_jones

Guest
correct gb?

Thanks lenny thats an intresting thread. however that gb looks different from
http://www.staton-inc.com/Details.asp?ProductID=2801
it is a different one no?

I assume so As the engine looks like the honda gxh50 from experience which means diff hole pattern.

Do you know what the output sprocket arrangement is for the gb compact gearbox is? this has me confused, do you screw on a output sprocket?

if you go onto "The products below were also bought by people who bought gearbox..." it lists this http://www.staton-inc.com/Details.asp?ProductID=2955 which is an but is it the correct one? and how would you connect them.:confused: as ts not threaded etc

surely im am no the only one who whats to make a small light motored bike?

staton offer a semi complete kit here but dont give and detail of output sprocket http://www.staton-inc.com/Details.asp?ProductID=3232:-x
and we all know that having a motor an your bike without an output sprocket is as usefull as a sack of spuds (potateos)

The output shaft has 8 mm x 1.25 threads x 10 mm long and the OD is 12 mm x 10 mm long??? what do this mean and to what output sprocket does it fit?

As i sent several emails to david. and the sales team but got ignored.:-/ ohh well thank god for www.motoredbikes.com:D
 

lennyharp

Member
Joined
Apr 17, 2008
Messages
216
I have talked to David and he can and will figure out the gears needed for the speed you want with the size wheel. When and if I buy one of these gearboxes that is probably what I will do. He does a great job designing and building the kits, communication can be a little muddled. Keep with it as he offers the best quality of gearboxes I see out there and worth waiting a little for. keep emails going on a daily basis and he will get back to you, i think. PM details to me if you need someone to call for less than you can and I will tell him.
 

loquin

Active Member
Joined
Jan 11, 2008
Messages
2,206
Well...

3.11 reduction still results in a terrible ratio for bikes.

Think about it. at max HP for the honda/R-S engines, you're talking 7000 RPM.

7000 RPM / 3.11 is 2250 RPM. For a 26 inch tire, you should be running about 300 RPM for 20-25 MPH. A 20 inch tire is therefore 300 * 26/20, or 390 RPM. This means that you STILL need another 5.75 reduction (apx) to get your wheel RPM in the right ballpark.

Without the reduction, you're looking at 133 miles per hour (assuming the impossibility that the engine could actually get to max RPM. It couldn't.) Even with a 6 inch scooter tire, you're looking at over 40 MPH.
 

lennyharp

Member
Joined
Apr 17, 2008
Messages
216
He is running a 20 inch wheel. What gears would you recommend there Lou? Seems like a 40 th or so but I don't know the formula to figure it.
 

loquin

Active Member
Joined
Jan 11, 2008
Messages
2,206
Total reduction around 15 to 1. Engine to Axle.

If you assume that the staton 18.75 to 1 gearbox works well with 26 inch wheels, then, it's a simple ratio.

18.75 * times 20/26, yields 14.42 ...

With a 3.11 to 1 gearbox, you would therefore need an additional 4.63 reduction. (14.42/3.11)
 
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appye

Guest
Loquin. 3.11 to 1 would obviously be a horrible reduction for a bike or any vehicle. This is just the initial reduction achieved at the output shaft before being further reduced by the sprocket sizes.

I am trying to figure out if it is feasable to mount this gearbox on to my GEBE kit with minimum fuss. I am thinking that with the narrower angle that would be provided with a 10 tooth gear chained up to a 60 tooth gear (providing me with a proper ratio) that the GEBE mount bracket might get in the way? Maybe not.

I am seriously considering purchasing this gearbox and a chain/sprocket set for my GP460.
 
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fireball_jones

Guest
hello guys thanks for the cotrabution.

assume we use low rpm 4500 thats what i base my cals on similar power yet les fuel burning any problems guys?

so heres my calcs (apoligise im only architect by trade not engineer so please keep abuse to mimimum i just used my logic to get the final answer)

remember based on 20 " wheel

speed required/desired

20 miles hour top speed + 32180 meters per hour

or 536.3 rec meters per minute

engine rpm

at shaft 4500

at output of 3 :1 gb 1500

meters per minute at 20 mph divided into wheel diameter 1.596 METERS (easier for converstion)

536.3 mpm divided into 1.59

= 337 revaloution of 20" wheel per minute to go 20 mph

so extra gearing is 1500 divied into 337 is 4.5 bhal blah

therfore using a 10 tooth output sprocket i would need 45 thooth back sprocket

correct...

ohh my math teacher would be pround...ok maybe not

even though now im more than likey going to buy the 5:1 dax gb giving a 27 rear sprok

cant remember calcs at home

waht do ya'll think?
 
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