Only the series30 with a 6" driven has a 10% overdrive,
all other TCs (series 20, series 40 and even series30 with a 7" driven are 1:1 or lower)
Well
instead of drilling holes to keep the driver.2 engaged at all times, you can simply add small washers or precisely fitted shims inbetween the weights to expand them at all times.
But you should keep in mind that a TC has an efficiency of less than 80%, so stacking two of them will result in less than 64% of your original motor power available to actually push your kart.
I'm not exactly sure that this can actually work at all;
the s30-6 setup has a low ratio of 2.7:1.
with a properly geared kart (say 6:1) you end up with a takeoff ratio of around 44:1
which is insanely low.. and as a result your takeoff is powerfull but slow until the TCs are trying to adjust, basically cancelling out at least one TC (likely one flicks into overdrive immediately.. more likely they both adjust slightly to get to something like a 12:1 ratio perhaps...
So that didn't work too well (effectively the same as a 4.8:1 ratio and one one TC)
Okay, so you remove that final ratio completely (1:1) to get a more reasonable take of ratio of 7.3:1...
the TC.2 will have a hard time moving against all the unleveraged force of your kart,
and it's belt will suffer.. it'll likely just burn off!
But for now let's assume your belts will see no wear because of that.
7.3 is a nice ratio overall and the kart will act and behave just fine as long as you get it going without burning a belt..
... you accelerate since it's top speed you're after and both TC will very likely indeed try to shift into higher gear..
and they can.. up to a point!
in theory your now set high ratio would be 0.81:1 which equals a top speed of well above 145mph (with only 11" wheels that is)
with only 52%* of the engine's torque you'll hit a wall much sooner than that..
namely at around 50mph (air drag, and so will stop you from going faster than that)
which happens to be at a overall ratio of ~2.6:1 (again plus or minus)
And that is very close to the ratio of one TC again...
and thus you can simply replace one TC with with a say 26T sprocket to achieve the same result.
*(0.81 because of the ratio and 0.64 because of the efficiency of a TC)
See? in both extreme situations you can substitute a TC for a different sprocket ratio.
you'll burn your belts with a 2.7:1 ratio of course but that's nothing new
Wonder why noone ever put TCs in series? because it's pointless.
in parallel is great though (efficiency and such)
Anyways, if you have two TCs laying around go for it, mount them to a jackshaft
pop driver.2 open, place a washer or two on the sliding rods in between the weights
and give it a shot.
you can just remove the washers and nothing happened (other than you probably burning a belt)
but you'll know for sure.
'sid
PS sorry Doug.. I think I indeed can't
So I have been kicking this idea around in my head for some time now. This setup is meant to increase the variation that a torque converter gives you, obviously doubling it is my intent. I was surprised to find no info on anyone trying this, and yes I searched. Now I know this is not practical. If I were to buy 2 torque converters I might as well find a old motorcycle engine and be done with it. But this is meant for people like me who have an extra go kart/ torque converter lying around. It would be cheap and give you more range. The only problem I foresee is spring adjustment, but a spring is a spring buy one with enough tension and the second torque converter should be fine.....I assume. So what do you guys think?...will it work?
Extended variable transmission.jpg
No offense though....just saying! We are all supposed to all be Buddies here!
