The ramps shown in these photos are used in Nelson .45 long stroke pylon racing engines. The machined phenolic base pieces are glued in place with JB weld after roughing the inside surface of the crankshaft. Roughing of the gluing area is done with a dremel tool & a round nose carbide bit. After the phenolic piece is glued in place, a thin coating of JB weld is applied to the top surface of the phenolic piece. A small toaster oven is used to heat the crankshaft first. The heated crankshaft gives the JB weld a faster curing time & causes the JB weld to flow out smoothly. Cotton swabs are used to get the JB weld into the small crankshaft area & on top of the preglued phenolic piece. Some practice will be required to get the proper technique. If done properly, the ramps will remain in place over the life of the crankshaft. Engines with ramped cranks pipe up much more easily & showed a RPM increase of 300 to 400 RPM's on the high end. These engines operate in the 29,000 to 32,000 RPM range.
Jim Allen