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Originally Posted by PWMAN
Not if you get the right clutch, sure any stock or medeocre clutch will blow up but not if you get one right for the job. Like I said about the differentials, if you put a stock clutch in a car making 800 ft/lbs well thats your fault.
I see your point about 5000 RPM then dumping the clutch, but still there are a lot of diesel trucks pulling 12,000+ pound trailers making 1500+ foot pounds-what happens every time they shift or for that matter take off the line in 4WD pulling 6 tons, not to mention the truck weighs over 3 tons itself. And if they can do 2000 RPM, dump clutch with 10 tons and 1500 ft/lbs, well you get my point.
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I agree with you. My first post on the subject was advice to get the right clutch, and that it would be expensive, not to avoid one altogether.
Besides, every good race clutch set up I have ever seen uses a steel bell housing that doubles as a scatter shield. Such an item should be considered essential. Again, the point was to either spend the money to do it properly, or not do it at all.
You are saying the same thing.
As for truck clutches, its not the weigh of the truck that makes the difference, its the kinetic energy stored in the rotating parts.
Kinetic energy increses by a factor of 4 times, as the speed doubles. A crankshaft spinning at 3000 rpm has 4 times the amount of force acting on the clutch than one spinning at 1500 rpm.
Therefore, a BBC at 5 grand is likely to have more energy to deliver to the clutch than a truck engine at 1500 rpm.
Finally, truck clutches do not grab the way an auto engine clutch does.
In my experience, the engagement is a bit 'softer' and thus more gentle on the parts, regardless of how you dump the clutch. This is because, in part, a truck clutch disk is actually quite small (12" dia on my Cummins 855) relative to the size and torque of the engine.