Improve Power With A Better Stroke

What Are Stroker Kits, And How Do They Increase Torque? 

An alternative to cylinder boring, a stroker kit is an effective but labour-intensive route to power gains 

Thankfully, stroker kits can be purchased that simplify the process of engine enlargement by lengthening the stroke of the piston, avoiding any expensive machining needed for boring-out a cylinder. 

A stroker kit increases an engine’s displacement by lengthening the stroke of the piston. In a kit will be bespoke engine components altered from OEM parts to achieve this increase in stroke. They allow the piston to travel further up and down the cylinder thanks to the use of a different crankshaft. The journals along the crankshaft are lengthened by a given distance depending on the severity of the stroke enlargement. An increase in the height of the journal makes for double that increase in stroke length. This is due to the relative increase at TDC (top dead centre) and BDC (bottom dead centre).

To stop the piston crashing into the cylinder head, other aftermarket modifications are also present. Firstly, the piston pin can be set higher up the connecting rod, or the rod itself can be shortened. This avoids any need for complicated CNC machining of cylinder heads or walls to incorporate the longer stroke.

(CarThrottle.com)