Belt & Distributor Drives
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.
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, Jesel has cam adapter assemblies capable of reducing camshaft endplay down to as low as .001”.
The 2 piece upper pulley design is infinitely adjustable ±10°.
The solid upper pulley design is adjustable ±8° in 2° increments.
Accessories are available to run distributor drives, fuel pumps, or oil pumps off the front of cam.
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.
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 separately.
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.
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.
Belt / Distributor Drive Accessories
External Dust Covers
These covers shield the Camshaft Belt Drives from unwanted debris when used in adverse conditions such as off-road and dirt tracks. Available for a limited number of applications.
Dual Lip Seals
Available as a direct replacement for the standard cam and crank seals, these dual lip PTFE seals provide additional sealing for high vacuum applications. Ideal for engine builds trying to exceed vacuum readings over 20 in-Hg.
Zero Thrust Cam Adapters
Designed to reduce the amount of lifter-damaging camshaft endplay, these cam adapter assemblies are manufactured from through hardened tool steel and feature Torrington Needle thrust bearings. Certain block applications require machining.
Cam Timing Washer
This cam adapter washer provides a simple way to obtain a cam position signal when using electronic fuel injection. The washer can be rotated to work in conjunction with the user’s fabricated bracket and magnetic pickup.
Used to replace the stock distributor when running our belt driven Distributor Drives. These plugs are available for either wet or dry sump oiling systems.
We have many special offers involving the Jesel Belt Drives and Distributor Drives. Please Contact Us listing the products you are interested in by clicking the link below.