Keith Black
Hypereutectic Pistons

Toyota

Hypereutectic Series Features:

Fully machined head and valve ports.
Advanced accumulator and mini groove technology.
Drilled oil returns.
Diamond finished skirts.
Broached pin holes.
Spiral lock lockrings.

United Engine relocated to Carson City, Nevada in 1978, where it has continued to grow. Since it's move, United Engine has continued to look at it's role in the domestic and world market. Currently, UEM manufactures the Silvolite OE aftermarket piston line, KB Performance Pistons (including the motorcycle division), and The Claimer Performance Piston Series. United Engine and Machine Company is now enjoying more than 80 years in business.

When you examine a piston you rarely examine the bottom of the ring groove. Even if you looked at the grooves of the same style pistons, seeing a difference without a micrometer would be difficult. From manufacturer to manufacturer, however, there can be differences in what is called the root groove diameter. The main difference is in what is called compensated ring grooves. What is compensated ring groove? Basically the root groove diameter is moved with the oversize. For years manufacturers would supply the STD root groove diameter for all oversizes. A .060 oversize piston would have the STD root groove diameter. A compensated ring groove means the root groove diameter would move with the oversize. A .060 oversize piston has the root groove moved out .060. In addition, the ring manufacturers compensate each oversize to match the piston, so there is no need to worry about matching rings and pistons.By compensating the ring grooves it cuts down the space between the back of the groove and the ring. This cuts down on un-burnt fuel stored in this area. In addition, compensated ring grooves make the land stronger, help rings to seat sooner, and allow the top rim of the piston to run cooler.

All KB pistons are supplied with compensated ring grooves.

We have a complete line of racing pistons and rings for import and more from wiseco,probe,srp,trw,venolia,mahle,ross, speed pro, silvolite and keith black.