Frequently Asked Questions

What size converter do I need?

Here are the general horsepower and cubic inch guidelines we follow for determining what size torque converter would be most appropriate for your application:

Converter Size Horsepower Range Engine Size
8″ 425 to 825 283 to 500
9″ 750 to 1200 500 to 632
10″ 925 to 1300 400 to 632

What is a torque converter?

A Torque Converter

A torque converter, or stall converter as it is sometimes called, is what connects the engine to the transmission.  The torque converter takes the place where a mechanical clutch normally would be in a transmission.  It is a fluid coupling device that multiplies torque during acceleration. Because the torque converter is a fluid coupling device, the engine can continue to spin when the car is not moving.

What are the main parts of a torque converter?

There are four main parts.  They are the front cover, impeller pump, stator, and turbine.

The Front Cover

The front cover bolts to the flywheel on the engine side of the torque converter. The front covers in our converters are machined from billet steel in order to withstand the stress created by the engine. Though billet front covers do not actually increase performance, they are essential in any high performance application because they provide increased reliability and strength that is necessary when an engine puts out a lot of torque.

The Impeller Pump

The impeller pump is welded to the front cover, is what drives the fluid inside the converter using vanes or fins. Our vanes are furnace brazed for increased strength, and can be adjusted to achieve the desired stall speed. A Torrington bearing separates the stator and the impeller pump inside the converter, and in extreme applications an anti-balloon plate is necessary to prevent the converter from ballooning when the engine is turning a lot of RPM.

The Stator

The stator is situated between the pump and turbine so that it can alter oil flow returning from the turbine to the pump. It is what redirects fluid to the outer vanes of the converter. The stator also multiplies torque, and can be machined to achieve the desired stall speed. The stator is what holds the sprag, and is usually aluminum, but in certain applications a steel stator is necessary for added strength.

The Turbine

The turbine is what drives the transmission. There is a spline in the center of the turbine which receives the input shaft of the transmission. The turbine is either furnace brazed, welded, or both, and the clearance between the turbine vanes and impeller pump vanes is adjusted to loosen or tighten a converter.