seeker1056
gear head
- Joined
- Aug 3, 2006
- Messages
- 1,001
I have searched high and low with no luck on pulling clutch information.
So my questions are to do with best setup and clearances as it would be nice to be able to check our clutch throughout the season without the onerous task of removing the driveline and clutch to bench set it
Now I know with any manufacturer there are "setup" procedures on the bench - but none of them give what I would call definitive type measurements for the released discs, or plate fingers to throw out bearing in the vehicle.
I think they assume that so long as you are running a stock hydraulic setup that you will have what's needed for clearances, throw etc etc.
However that is rarely true due to manufacturing sloppiness in tolerances. bell housings are never bang on for centre or runout, , pivot balls vary in length, throw out bearings are not all exactly the same length, throwout forks vary, etc.
All of these together can and do cause engagement and disengagement issues when in competition if not just driving around the pits
If I was drag racing - and ran a dual disc or slipper style clutch one would have a bell housing window and one could measure clutch disc clearances with a feeler gauge and you could readily tell in the vehicle if your setup was going away by the measured clearances. These clearances being supplied by the manufacturer. But apparently not by any pulling clutch suppliers.
There is also minimum and maximum throw out bearing clearances to the fingers and depth/throw distance for just about any other type of performance clutch, but none seem to be found for pulling?
or have I missed something
my nv4500 bell has a top window plate that would allow for measuring throw out bearing stuff, , and I am sure I could put a 1" hole in the bell for disc clearance measuring purposes.
Does anyone out there with good clutch knowledge have some baseline figures for say the Valair, or the South Bend, or the Haisley Comp?
So my questions are to do with best setup and clearances as it would be nice to be able to check our clutch throughout the season without the onerous task of removing the driveline and clutch to bench set it
Now I know with any manufacturer there are "setup" procedures on the bench - but none of them give what I would call definitive type measurements for the released discs, or plate fingers to throw out bearing in the vehicle.
I think they assume that so long as you are running a stock hydraulic setup that you will have what's needed for clearances, throw etc etc.
However that is rarely true due to manufacturing sloppiness in tolerances. bell housings are never bang on for centre or runout, , pivot balls vary in length, throw out bearings are not all exactly the same length, throwout forks vary, etc.
All of these together can and do cause engagement and disengagement issues when in competition if not just driving around the pits
If I was drag racing - and ran a dual disc or slipper style clutch one would have a bell housing window and one could measure clutch disc clearances with a feeler gauge and you could readily tell in the vehicle if your setup was going away by the measured clearances. These clearances being supplied by the manufacturer. But apparently not by any pulling clutch suppliers.
There is also minimum and maximum throw out bearing clearances to the fingers and depth/throw distance for just about any other type of performance clutch, but none seem to be found for pulling?
or have I missed something
my nv4500 bell has a top window plate that would allow for measuring throw out bearing stuff, , and I am sure I could put a 1" hole in the bell for disc clearance measuring purposes.
Does anyone out there with good clutch knowledge have some baseline figures for say the Valair, or the South Bend, or the Haisley Comp?
Last edited: