sdwarf36
Parking Attendant
Posts: 4
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posted June 25, 2003 04:13 AM
lock up clutch on a zx-11
I'm debating on puting a lock up clutch on my zx11 powered dwarf car. I also use the car racing in hillclimbs (up twisty paved roads). I usually downshift clutchless,but i'll fan the clutch on the upshift to be able to shift under power. Will the extra force of the lock up arms on the clutch pack prevent me from being able to just quickly slap the clutch to get it in the next higher gear?
  
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted June 25, 2003 07:20 AM
This is a no-go. You cannot cluth-shift a lock-up at a high wheel speed. You are forcing the actuator to work against the centrifugal force produced by the weights. Stuff will break. Lock-ups are only successfully used on drag racing setups with air shifters. If you could go the air shifter route, it would be slick, though.
Also it is a common misconception that these clutches (Zx-11/12) will slip under load. It takes well over 250 hp to get a healthy ZX-11 clutch to slip without any "driver induced" slippage at the lever.
Doug
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sdwarf36
Parking Attendant
Posts: 4
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posted June 25, 2003 05:36 PM
lock up
Doug,
Although air shifters are illegal when i run it as a dwarf,i plan on putting a dale walker electric shifter on. I know i'm nowheres near 250 hp, but i do have to get 1275lbs around some sharp corners + up steep hills -accelerating from times as low as 25 mph-to some straights where i'm flat out in 6th.
I launch from a dead stop (uphill) at around 7k-about 1/2 throttle-and try to slip the clutch out for the first 40 ft or so to get the tires to hook-think i'll be able to hold back against the clutch doing that?
Thanks for the input!
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dougmeyer
Needs a job
moderated
Posts: 2713
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posted June 29, 2003 10:06 AM
Another common misconception about the clutch here. A healthy clutch will not slip. The engine will stall first. Again, the only time a healthy clutch slips is when you slip it. Once you no longer are holding it partially disengaged a HEALTHY clutch will load the engine before it slips. If you ask too much of it i.e., try to move too heavy a load it will drag the engine down to a stall.
Think about it- If you try and take off in, say, 5th gear you are merely trying to move the car's weight WITHOUT the advantage of the torque multilication provided by the gear reduction. What happens- the engine dies unless YOU slip the clutch.
Doug
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