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THE ORIGINAL BELT DRIVE SYSTEM

Innovation is at the forefront of any product produced by Jesel and that’s why our Camshaft Belt Drive Systems are one of the most sought after components in the racing industry today. From the first prototype camshaft belt drive ever manufactured by Dan Jesel back in 1982 to the sleekness of today’s CNC machined pieces, Jesel Camshaft Belt Drives continue to lead the industry as the premiere camshaft belt drive assembly.

In the never ending quest for more horsepower, engine builders in the 1970’s began using larger cam lobes which in turn required stiffer springs. The stiffer springs allowed the engine to turn more rpm, but eventually became too much for a timing chain to handle. At the time, gear drives were the only solution, but they bring with them their own set of problems. Gear drives transfer a tremendous amount of crankshaft harmonics to the valvetrain, not to mention taking incredible amounts of horsepower to drive. As necessity is the birth of most components in high performance engines, the Jesel Camshaft Belt Drive was created to solve these problems.

Recognizing the need for improvement, Dan Jesel did what he does best. Using internal cam belt assemblies as a blueprint, Dan engineered a system to externally adapt this technology to a small block Chevrolet. After sourcing a belt and gathering material, Dan went to work manufacturing the prototype pieces and in conjunction with a local engine builder successfully built and tested the drive on a NHRA Competition Eliminator engine. The results were more than impressive and the dyno numbers proved it.

Today, all Jesel Belt Drives feature extremely accurate externally adjustable cam timing to fine tune the engines power curve. The camshaft can be changed by simply removing the upper pulley and cam seal plate. Teflon® coated cam and crank seals insure proper oil and vacuum sealing. The Gates High Torq Drive™ belts are engineered to handle well over 1200 lbs of spring pressure and are custom made to Jesel specs to insure the proper belt tension. And on certain applications, we have cam adapter assemblies capable of reducing camshaft endplay down to as low as .001”.

To date, Jesel has engineered an arsenal of over 40 belt drive assemblies. So, whether you’re on a six second pass down a quarter mile drag strip, racing in a 24 hour endurance race or just taking a trip down to the local car show, you can be assured that the components controlling your cam timing are of the highest standards and machined to exacting tolerances.

FEATURES

Patented High Torq Drive™ reinforced belt operates dry and spins with less friction than timing chains or gear drives and also absorbs harmonics.

Cam timing adjustment is made externally providing the easiest and most accurate tuning available.

Teflon® coated high vacuum cam and crank seals.

Crank Pulley is heat-treated steel and incorporates a High Torq Drive™ tooth configuration.

Cam timing is externally adjustable.

 

Kit hardware is all Grade 8 Allen and Torx™ head design.

2 Piece Upper Pulley Design is infinitely adjustable ±10°.

Solid Upper Pulley Design is adjustable ±8° in 2° increments.

Hard coated Billet Aluminum Upper Pulley features patented High Torq Drive™ tooth configuration.

Accessories available to run distributor drives, fuel pumps or oil pumps off front of cam.


DISTRIBUTOR DRIVES

Jesel’s Belt Driven Distributor systems, a direct bolt-on accessory to our Camshaft Belt Drives, eliminates timing inaccuracies due to camshaft deflection and cam walk. A typical gear driven distributor running off camshaft has the possibilty of retarding the initial ignition setting at high RPM due to the camshaft twisting from torsional loads. By driving the distributor drive directly off the camshaft pulley, ignition timing stays constant and will not deviate from the initial settings. Another benefit to using our Belt Driven Distributors is the ability to set the engine back further in the chassis without worrying about firewall or windshield interference. A crank trigger firing system along with an external ignition box is required for all Belt Driven Distributor systems.

FRONT DRIVE COMBOS

For the engine builder planning on using a Camshaft Belt Drive as well as a Belt Driven Distributor, Jesel offers a Front Drive Combo which incorporates both units as one convenient part number. In addition to being an ordering convenience, the Front Drive Combo is easier on your budget as the units are discounted when bundled together. The combo can be ordered with either our Pro Series or Extreme Series distributors with or without the available ICT system. As with all Jesel distributor drive systems, a crank trigger type firing system as well as an external ignition box is required.


Extreme Series Distributor Drive
Introduced in 2011, Jesel’s Extreme Series Distributor Drive System is designed to handle the high cylinder pressures experienced in Pro Stock and Pro-Mod type engines. This distributor drive features the MSD® 5” Pro-Cap to ensure accurate spark delivery and to reduce spark scatter frequently experienced in high cylinder pressure applications.


Pro Series Distributor Drive
Ideal for naturally aspirated engines, this drive features a Gates PowerGrip HTD belt and uses Moroso® Ultra Series distributor components. The balanced brass rotor tip and form staked carbon ball on the coil lug have been designed to eliminate grounding paths and cross firing. This drive can be used with a wet sump oiling system with the addition of a gear driven distributor plug sold seperately.


Individual Cylinder Timing (ICT) Drive
Available in either series, Jesel’s ICT timing systems provide a simple and accurate cam sync source for engines operating with an electronic fuel injection system. This drive is setup to use a 3/8-24 non-magnetic pickup (not supplied) which picks up the cam position off a rare earth magnet embedded in the external rotor. The pickup can be indexed every 60° for ideal wire routing.
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