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8, 10 RIB |
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'99 up Eaton (Lightning, '03 Cobra, Shelby GT 500) |
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All Kenne Bell (Lightning, '03 Cobra, Shelby GT 500, Ford GT) |
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| STEEL
SUPERCHARGER PULLEYS - No one offers more steel pulleys for the Kenne
Bell Twin Screw and Eaton Roots superchargers - because pulleys and superchargers
are our business and not a sideline. Supercharger/driven pulleys are only
1/3 the diameter of crank/drive pulleys and therefore spin at approximately
3 times the speed of the crank - 750 ft/sec. This equates to over an 1/8
mile per second! That's a lot of heat and friction. Could that be why the
OEM's use steel supercharger pulleys exclusively? It's precisely why Kenne
Bell has never used the softer aluminum supercharger pulleys with serpentine
belts - and never will. We use only durable long life high grade plated
steel for both Kenne Bell and Eaton superchargers. It's common practice
to switch pulleys to vary boost levels for street, weekend racing etc. Kenne
Bell Steel Pulleys can be quickly and easily replaced with one bolt using
the Kenne Bell Pulley Wrench (Twin Screw) or the Kenne Bell Billet Pulley
Puller (Eaton). Stock Eaton pulleys are pressed on, constructed of relatively
soft high lead material and are therefore easily bent by "old style" pullers when removed. Reinstallation is also difficult, requiring a press
if a good installation tool is not available. Kenne Bell Steel Pulleys are
virtually indestructible. Big selection. Precision machined steel and plated
for corrosion resistance. |
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WARNING: USE ONLY KENNE BELL STEEL SUPERCHARGER PULLEYS ON OUR SUPERCHARGERS. USING ANY OTHER PULLEY WILL VOID THE WARRANTY. |
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• LONGER BELT
LIFE
• DURABLE STEEL
• LESS WEAR |
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Part#
F2000 |
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8 Rib Pulleys
EATON (Cobra & Lightning)
3", *2.75" (Kenne Bell F2500 Pulley Puller recommended)
*2.75" is smallest pulley that can be used on the Eaton. 8
Rib Pulleys KENNE BELL (Cobra)
4", 3-3/4", 3-1/2", 3-1/4", 3", 2-3/4",
2-1/2" (Kenne Bell SC3140 Pulley Wrench required) 8 Rib Pulleys KENNE BELL (Lightning)
3-1/4", 3", 2-3/4", 2-1/2" (Kenne Bell SC3140 Pulley
Wrench required) 10 Rib Pulleys KENNE BELL or Shelby/GT 500 w/KB Supercharger or Drive
4”, 3-3/4”, 3-5/8”, 3-3/4”, 3-3/8”, 3-1/4”, 3-1/8”, 2-7/8”, 2-3/4”, 2-5/8”, 2-/2”ù (Kenne Bell SC3140 Pulley Wrench required) |
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BILLET
PULLEY PULLER (EATON
SUPERCHARGER) - There are 3 ways to change pulleys on an Eaton. The
most expensive and time consuming is to replace the entire drive assembly
with a new one and a smaller pulley. So if you're alternating 3 pulleys,
you would need 3 new expensive drive assemblies. Why buy a drive assembly
just to get a pulley? The second method utilizes old style pullers that
usually bend and ruin the pulley the first time. The new lightweight Kenne
Bell Billet Aluminum Pulley Puller is the easiest and most economical way
of removing pulleys from the stock Eaton drive. It doesn't distort and ruin
your pulley and you don't have to buy new drives for each pulley change.
A pulley can be removed or replaced in 5 minutes with this tool. Great for
alternating "street" and "race" pulleys. Note: We DO
NOT recommend aluminum supercharger pulleys because of the high belt speed
and resultant wear. |
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New Design |
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• LIGHTWEIGHT
• EASY TO OPERATE
• REMOVES & INSTALLS EATON PULLEYS |
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Part# F2500 |
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PULLEYS,
RATIOS & BOOST - See chart for boost numbers. Plus (+) psi boost
numbers (+2 psi, +5 psi etc) is a non scientific, inaccurate and confusing
method of rating pulleys. At Kenne Bell, we prefer to also use "ratios"
(crank pulley ÷ supercharger pulley = ratio) to describe a potential
boost increase. In other words, list the boost AND ratio. Why? Is a supercharger
pulley a +2 with the stock 7.5", 9" or ? crank pulley? And is
the +2, +4, +6 crank pulley with a 3.5", 3" or 2.7" supercharger
pulley? To make matters more confusing some superchargers, such as the Eaton,
do not develop the same boost at 2000, 3000, 4000, 5000 and 6000 rpm. They
suffer from "boost drop off." For example: What plus (+) pulley
rating do you give a Cobra '03 pulley that is 15.3 psi at 4000 but only
10.3 at 6000 when the stock pulley was 8.3 at 4000 and 7.8 at 6000? We refer
to the stock pulleys as a 2.11 ratio and 7.8 psi (7.5" ÷ 3.55"
= 2.11 ratio) and the 3" pulley as a 2.5 ratio and 10.4 psi (7.5"
÷ 3" = 2.5 ratio). Now take the same 3" pulley with a 9.25"
crank pulley and you have a 3.1 ratio instead of a 2.5 ratio. On our superchargers,
that's around 6 psi variance. Get the point? Kenne Bell lists the ratios
and boost for all applications. We offer Lightning/Harley SC and crank pulley
combinations of 9.5, 11, 14 and 16 psi. The Cobra combinations are 10.4
and 13.3 with sc pulleys only. Note: We don't recommend a larger crank pulley
for the Cobra Eaton, but for those who prefer one, we have an 8.25" Cobra which works with the Eaton or Kenne Bell. Want to know if your supercharger
is producing the boost it's supposed to. |
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Note: Boost
pressures are to be used as a guide and may vary |
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We don't recommend a
larger than stock crank pulley on the Cobra as boost drop off at 6000 in
the high winding Cobra is substantial with a 2.75" pulley (2.72 ratio).
**Boost pressures will vary with inlet restriction.
For comparison, all tests were conducted with stock inlet systems. For
example: with a 2.75" pulley, '03 Cobra boost will increase approx.
2 psi with Kenne Bell Cool Air Kit. That clearly indicates the Eaton simply is maxed out
and cannot pump sufficient air to keep up with the engine. The lower revving
less powerful Lightning is able to better utilize a larger diameter crank
pulley as "boost drop off" is not as severe as the Cobra. |
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