| How to get 5 disks into a 8 5/8 bellhousing (without buying a 9.4" bellhousing): |
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| A) release bearing clearance --> foot off of pedal, cannon extended .3 - .5" B) base Arm offset = .1" C) pressure plate thickness (donut) = 1.0" D) clutch pack 3.0" (a all new pack would be close to 4") E) flywheel 1.15" F) clearance flywheel to engine plate .06" Total 5.81" (new disks = 6.81") Starting position for release bearing. |
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| Release bearing in picture above is touching (holding away from the pressure plate) this 1st arm, before cannon starts to move. |
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| 12th arm 1.1 + inches (or more) from 1st arm Note all 12 arms (or whatever pp came with) aren't required . |
| ----> initial "hit" of engine (add bending of arms,pp, flywheel etc. ----> pack clearance .050" X the arm ratio 6 = .30" ----> Travel of cannon (minimum) to clear arms 1.1" total travel of cannoc1.8" (to 2.5") ----> wear of clutch pack during the run .08 -- .18" X arm ratio 6 = .60" + ----> clearance after release bearing has passed all arms = ? Total distance from engine plate to front of release bearing = at least 8" + bending, clearance+ Final position of release bearing is "outside" of bellhousing. add 1" for all new disks or aprox .6" less for 4 (used) disks. |
| also check clearance on cross shaft and fork *** |
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| Add a 1/4" spacer (alowed by NHRA) or thicker to space back bellhousing |
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| enlarge hole in back of bellhousing, note the fork is notched to clear at bottom, and hole incudes transducer "flag" |
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| Another spacer .5" or more Note the bottom will have to be "clearanced" for fork |
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| Clearance in front of cannon. |
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| Optimizing release bearin, push tube clearances. Also depending on how much travel you need, the shaft (release bearing fork, pedal) is usually moved down in bell housing with a longer and wider fork. |
| Sheet to keep track of what you wanted / what you got after setup and shimming arms |
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