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AFT Multi Disc, Multi (18) Arm,
Multi Stage, Titanium, 9 Stand,
Top Fuel , Slider, Centrifugal Clutch
( shown 10.5 and 11 inch) aprox $10,000.00/each |
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Aluminum RAM 8 bolt Hemi (early
flange) 2 Disc Sintered Iron,
Pedal Style, Chevy Starter Ring Gear, 6 release Arms,
6 Stand (Titanium), , Pro Mod Clutch aprox
$4,000.00/each
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Flange
/ Crankshaft |
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6 Bolt Chrysler
most common flange slant/6 to 440
Flywheel and
flexplate are located (centered)
on raised area in center of crankshaft
Note:
no bronze bushing for 4speed standard
transmission input shaft , but
crankshaft is machined to install a
bushing |
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8 Bolt Chrysler
same
dimensions as 6 bolt (above) with 8
bolts
Flywheel and
flexplate are located (centered) on
raised area in center of crankshaft
Note:
no bronze bushing for 4speed standard
transmission input shaft , but
crankshaft is machined to install a
bushing |
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8 Bolt Chrysler /old style 392 hemi
( this is what all fuel / TAD/ FC/
and most promods use today)
Flywheel is
located (centered) on outside of
crankshaft flange center is removed like
early Chryslers This is preferred
because it allows for larger input shaft
bearings needed on
multidisc clutches
Note:
shown with adapter ring installed to
allow use of flexplate or flywheel that
doesn't locate on outside of crankshaft
flange. in other word converted to 8
bolt later style shown above
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Chevy |
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Flywheel |
Material |
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cast iron, steel, aluminum, stainless
steel, and titanium |
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Size / Diameter |
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from 5" to 12 inches |
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Disc / Floaters |
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Pressure plates
( hat/
clutch/ donut/ pressure-plate ) |
Automotive Street/Strip
There are 3 Basic types of pressure
plates.
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diaphragm-type -
static pressure (center)
street /strip - low
pedal pressures |
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spring-type |
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Borg & Beck - static
pressure (right) street
/strip |
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Long - static pressure
and Centrifugal (left)
competition / very
adjustable
springs force pressure
plate against discs -
Springs provide all or
most of locking force,
centrifugal force added
by arms extending out of
cover. adding weight to
the end of arms
increases the force as
engine RPM goes up
this example is a 2
disc, aluminum flywheel
, chevy starter ring,
long style cover,
adjustable springs (
threw holes in cover ),
adj centrifugal force
(by adding bolts nuts
and washers to 3 arms)
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Exceptions
In auto
racing there is always
exceptions
this is a diaphragm clutch with
centrifugal arms added ?
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Pressure plates - Slider
Clutches
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If it is
desirable to program the clutch
forces to engine RPM (Drag
Racing) then reducing (or
eliminating) the springs
(static) and using the
centrifugal weighted arms for
most or all clamping forces is
an option. In drag racing we
call this a slider clutch . at
an idle the clutch may not even
provide enough force to
move the vehicle , sometimes a
clutch pedal isn't needed , like
an automatic/converter equipped
car. Sometimes described like a
snowmobile centrifugal clutch |
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Pedal
springs
force pressure plate against
discs, needs a pedal to launch
race car, but force primarly
centrifugal
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Centrifugal
spring
hold pressure plate away from
discs, may not need a pedal to
launch race car, but force only
centrifugal
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Multi
Stage
Note :
- arms installed are 6 base arms
same length (height from release
bearing)
this makes it a single stage
possibly an A fuel or Nostalgia
- arms
on left can be added in empty
slots on cover, or even replace
base arms
this would be added to clamping
force of pressure plat as
release bearing is moved back by
hydraulic/pneumatic clutch
management system (keep in mind
there will be an
imbalance if arms aren't kept
equal weight - which is
impossible so bye bye rear
bearing)
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Bearings |
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input
shaft |
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Release
Bearings
There is
several inside diameters ,
outside diameters, depths, and
an infinite list of custom
lengths of the sliders to allow
for the multitude of clutch
sizes and input shafts sizes to
the reverser or transmissions |
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Clutch Managment
(multi stage TF) |
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Fuel and
clutch release bearing position
- air management system |
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Cannon/Reverser
Hydraulic cylinder to control
position of release bearing |
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Bellhousing |
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Titanium - with Funny car
pedal , blow back tabs , Quad
bolts (4 - 3/4" cornerbolts),
and magnesium spacer to move
release bearing slightly further
into transmission area,
studs for lenco bolt pattern |
Material :
- Aluminum (yes there is still
some out there)(* no longer
certifiable )
- Steel Thin (* no longer
certifiable )
- Steel with aluminum inspection
cover (* no longer certifiable )
- Steel with steel cover
and clearance hole cover
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Titanium with all titanium
components including bolts |
Steel
- 8 5/8 with FC pedal - covers
are not aluminum |
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Depth:
- stock - this is lakewood style
stock , usually curved on top to
fit door cars
- less than 8" really old - but
still out there
- 81/8 " - these may be re
certifiable for multi disc
clutches - usually 2 disk
- 8 5/8 " - most common today 3
disk alcohol some 4 disk fuel
- 8 5/8"-converted to 9.4"
- 9.4 " Fuel multi disk |
Stock
style Note: shown is with
removable
bottom and is no longer approved
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8
5/8" converted to 9.4"
Note: spacer plate
between engine and front
of bell housing, and
spacer with large internal hole
so release bearing actually sits
in front pocket of cannon to
achieve enough clearance for 4-5
disk multi-stage clutch
Note:
(right) cross shaft has also
been moved further away from
center - to clear moving
clutch parts and provide better
geometry for fork and release
bearing wide clutch fork to
allow bearing to sit between
arms - for additional clearance |
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