output torque

Does anyone know about how much torque in in-lbs or ft lbs the 49cc engines average at about 3600 rpm or anywhere else in the rpm ranges?

I've tried a number of different searched but can't find anything here on it.
Lee

Thanks but that's not really what I'm looking for. What I'm doing is building an adapter that uses a one way ball clutch bearing to make a free wheel setup to replace a regular bike free wheel on the jack shaft of my trike. I want to make sure I get a one way bearing that has a big enough torque range.

Lee
packrat workshop index

Thanks guys,
That was the info I needed. From that info,the ball bearing type freewheel clutch I was looking at for making a adapter plate should work fine.

Lee
packrat workshop index

Creative Engineering said:

fleebell,

A sprague rated for 10 Ft./lbs. or more will do it with a good safety margin.

These engines produce somewhere around 2 H.P. out of the box...give or take a few tenths.

The basic formula is Torque = 5252 X H.P. divided by rpm

Torque at the crankshaft is about 1.5 Ft./lbs. @ 6000 rpm

There is a 4.1:1 internal reduction in the engine.

4.1 X 1.5 gives approx. 6 FT./lbs. @ the engine drive sprocket.

If you plan on another reduction prior to the sprague simply multiply 6 X the ratio of the reduction for a final torque value.

This isn't precise, as the actual H.P. and rpm where max torque is produced are unknown. It is close enough to choose the correct sprague, as you will want one that is over-rated anyway.

BTW...A commercial quality sprague, (One-way bearing), will outlast a bicycle freewheel 100:1.

Jim

Click to expand...

The engine I'm using came from an X1 pocketbike. It has one of those belt type transmissions on it that changes outputs. The motor has a 12t and is driving a 44t on that side of the jack shaft. The other side uses 2 28t gears. One is mounted solid to the shaft and drives the rear wheel chain and the other is operated from the pedals. It drive a 20" rear wheel with 7 speed gear cluster than came of a wally world kids mountain bike. I don't know the hp of the 49cc engine but the trike will do 32 mph flat out in high gear on the rear wheel. It pushes about 300lb altogether with me on the trike and when it gets above about 18 mph I don't pedal with it.

Here is a drawing of the jack shaft setup

bigger pic: http://www.packratworkshop.com/pics/jackshaft.jpg

Here are two versions of the adapter I'm thinking of making. It will replace the freewheel the 44t gear is currently mounted on.

bigger pic:
http://www.packratworkshop.com/pics/bclutch2.jpg


bigger pic:
http://www.packratworkshop.com/pics/bclutch3.jpg

Lee
packrat workshop index