Harley Davidson Evolution Compression

Evolution is the key word as these Keith Black Performance Piston Kits were spawned from this successful manufacturers line of automotive pistons.

Harley davidson evolution compression. The compression is only 1381. The engine isnt built full tilt. The 1100 Evolution engine has a predictably higher maximum HP of 50 at 5500 RPM with a top speed of 1019 MPH.

This what a stock EVOLUTION combustion chamber looks like with stock sized valves. This head came off an 80 CID engine that produced 101 horsepower. To give that CNC finish on heads and cylinders.

In the get a bigger hammer theory of things we rush out and buy a tricko battery that promises over 500 amps cranking power. The larger 1340 Evolution engine has a maximum HP of 58 at 5000 RPM and a top speed of 1025 MPH. Contrary to popular myth serious power can be made with stock Harley-Davidson heads without reshaping the combustion chambers polishing the ports and combustion chamber using a larger intake valves or making the ports larger.

Kirby is in FLorida. The engine is built to stay together for a long time and provide a lot of runs Dahl says. Keith Black pistons kit flat top 91 compression standard bore for Harley Davidson Sportster 1200cc.

I would guess the average stock EVO maybe has 150 psi of compression. Others that have owned EVOs may chime in. Trending price is based on prices over last 90 days.

The engine is easier to turn over resulting in less wear on your starter and battery. Automatic Compression Release ACR valves reduce the strain of starting your high performance motor by reducing cylinder compression - automatically. The 1200 Evolution engine has a maximum HP of 58 at 5300 RPM which is considerably higher than the abovementioned motorcycles.