The result of a collaboration with Line2Line Coatings, a specialist in patented abradable coatings for clearance control, United Engine & Machine’s new KB ‘Super Duty’ piston series for Harley Twin Cams feature an abradable coating applied to the thickness of the piston to wall clearance for a zero-install clearance.
The coating, a polymer based formulation, abrades in on start-up to hone “for the perfect fit” in the cylinder, eliminating piston rock for the best possible ring seal and no piston slap noise.
By reducing the clearance, engine efficiency is improved, lowering friction, maintaining an even oil film and protecting against scuffs and excess wear.
KB Performance pistons are offered in hypereutectic 390 alloy and forged 4032 low expansion alloy for high-performance, high-compression applications. They offer offset wrist pins for a quiet engine, and most have coated skirts. The low expansion alloy allows for a tighter piston to wall running clearance. KB Performance pistons are available for Knuckle, Shovelhead, Evo, Twin Cam, Sportster Harleys and selected Indians in a variety of different engine sizes and compression ratios.
KB PERFORMANCE PISTONS
www.uempistons.com