Welded clutches-who can tell me

[RYDRZ]

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[fasterfaster]

Bikes have been ridden for many years without back torque limiters and also without spitting people off But then in saying that if engine revs are not matched correctly on downshift then the added compression braking will and can induce rear wheel lock up. This can be also used as an advantage to step the rear out if one desires a Gary Mcoy type entrance into a corner.
The back torue limiter merely limits how much torque it will hold and then it allows the clutch to slip reducing the load held by the rear wheel. The limiter uses a "ramp up" effect to increase pressure on the clutch pack and hold full engine power on acceleration and then by running off the ramps when load direction is reversed (decel) the clutch no longer holds full power and the limiter allows slippage thru the clutch pack. Even with limiter in place under heavy braking with weight transfer on to the front wheel, rear wheel hop or lock up is still easily induced even with limiter in place. In short if you remove it all you have done is create a "normal" clutch situation with no back torque limiter fitted. If you are having shift problems I would say you have another problem ................... maybe clutch related but not due in any way to the limiter being in place.

[Legend]

An easier way to explain it,

Number of BTL's welded up = 100+

Number of crashes blamed on welded btl = 2 (same person).

Leonard.

[Ward P]

I may stand to be corrected, but the welded clutch will give you a better standing start take off, allowing you to slip the clutch old style.
A welded clutch is no good for turbos as it will slip under too much boost.

[fasterfaster]

If it's welded in the ramped up position it will hold the same power and more if heavier springs are fitted. Originally they were welded in rest position and spacers placed under springs but as said many weld them in the ramped up position giving maximum pressure on clutch pack. It's more in the take up when moving from rest that the BTL has an effect. I personally on my own bike prefer it locked up for street use and as for the drags one of the drag guys would be much more experienced to answer that and explain it's differences in getting the bike off the line with or without it operational.

[simmo]

will it spitt me off like sparmanglenn ?

Any back wheel will lock anyway even with the stock BTL it just helps
All my roads trips are with the welded BTL when around Aust, Tassie etc
If your thinking for a serious clutch grab you should be looking for a lock up or slipper set up
If you weld up your BTL all you do is take a bit more care backing off in the tight stuff
Other people fall off also in the tight stuff with a stock BTL

[Skidmarx]

great explanation, never realy understood the BTL, and havnt ever had to much drama with back wheels locking up on my previous bikes (cbr1000, R1) but geez does my old mans bike lock up, ducati 916, as soon as you let off she starts chirping up, got me buggered how he rides it

[simmo]

great explanation, never realy understood the BTL, and havnt ever had to much drama with back wheels locking up on my previous bikes (cbr1000, R1) but geez does my old mans bike lock up, ducati 916, as soon as you let off she starts chirping up, got me buggered how he rides it

Yep not all bike have the slipper set up like the Busa

[Ward P]

Chirping on aggressive down changes and the back wheel skipping was just a way of life with the old bikes. Blipping the throttle on the down change just became second nature . . .and it still is.
The old shaft drive suzi was the worst. Funny, but now that it's mentioned, the 'busa doesn't chirp down much at all compared to all my previous bikes.

[Maj]

For turbo you don't weld it up, or it will not hold much more than 250hp

[RYDRZ]

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[Maj]

never had a prob with hard decell on the turbo ,decompressing it for higher boost levels takes that hi strung edge off and makes it quite docile and yet the brute force is not far away when needed.
for my application the on the clutch "its not broke ,don't fix it"