Cox Model Engine - Crankshafts

Crankshafts

On the Bee engines there were 2 types of crankshaft produced. (and they are interchangeable)

1. All Bees with the exception of the Killer Bee and Venom had the same crankshaft that was only good for about 20,000 rpm before the conrod pin would break off.
2. The Killer Bees and Venom had a heavy duty balanced and lightened crankshaft that improved performance and could withstand speeds in excess of 22,000 rpm.

A company named Davis Diesel Development in the USA also make a similar crankshaft called a Killer crank for their diesel conversions. They found under the heavier torque loads caused by running diesel fuel, that the pins would break also; hence they produced their own killer crank. The same Killer cranks are now being produced again by Cox International.

On the Tee Dees and Medallions the cranks are also interchangeable but quite different. The Tee Dee has a large square hole at the intake end of the crank whereas the Medallion has a smaller round hole. The timing is also different. On the later TD RC versions, the crankshaft is lightened and strengthened similar to the Killer Bee crank. i.e. ground away and hole in conrod pin.