Lt77 conversion requirements

jp928

Well-Known Member
Over thinking things is one of my strong/weak points....Just looked up clutch set up in WSM - piston clearance from rest to circlip is 20mm. I think 'rest' or 'static' is throwout just in contact with fingers.
Still dont know what will indicate a spacer is needed on the slave mounting.
LT77 lever ratio is 80/118, so 20mm at push rod will produce 13.6mm at the throwout. Anybody know what the std 4 speed clutch throwout travel is ?
 
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jp928

Well-Known Member
Since I have a new Exedy clutch assenly, I contacted their chat service here. After a bit of research on the specific cover involved they said the throwout travel at the fingers should be 9mm, which provides for lifting the pressure face 1.6mm. With a P6 slave travel of 20mm, and an SD1 lever ratio of 1.45, the throwout travel would be 13.5mm. Interesting that we dont seem to see many/any reports of clutch failures on LT77 conversions..? So far my plan is to ensure that the slave travel wont bottom the lever inside the bell housing.
 

jp928

Well-Known Member
With the lt77 bolted to the block, with the clutch fitted to the flywheel, with the throwout in contact with the fingers the std SD1 pushrod protruded .394" outside the bellhousing face. The clutch slave, with the piston against the circlip, the pushrod contact in the piston is .64" in from the end of the slave. The mounting face of the slave is 1.54" from the end of the body. This means that with the std pushrod the piston will be pushed in 1.294" with the clutch engaged, fingers in contact with throwout. Pushing the piston to its maximum depth , the pushrod contact is 2.175" from the end face of the slave, so the std pushrod cannot bottom the piston. Still dont know why a 1/4" space may be required.
 
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