Harley Davidson Evolution Compression

Harley Davidson Evo Big Twins are notorious for cranking problems.

Harley davidson evolution compression. The engine is a SS-based Harley-Davidson Evolution V-Twin and is going to be in a Fast Bracket Race drag bike. The larger 1340 Evolution engine has a maximum HP of 58 at 5000 RPM and a top speed of 1025 MPH. The Evolution engine popularly known as Evo is an air-cooled 45-degree V-twin engine manufactured from 1984 by Harley-Davidson for the companys motorcyclesIt was made in the 1340 cc 82 cu in displacement for Harley-Davidson Big V-twins bikes replacing the Shovelhead engine until 2000 when the last EVO was placed in a production factory custom FXR4 FXR2 and FXR3 were the first CVOs.

Changing the cam and upping compression on an Evo motor would be reason enough for compression releases. The compression is only 1381. To give that CNC finish on heads and cylinders.

I would guess the average stock EVO maybe has 150 psi of compression. The engine is built to stay together for a long time and provide a lot of runs Dahl says. If the engine doesnt detonate and cranks good I would be ok with those numbers.

Evolution is the key word as these Keith Black Performance Piston Kits were spawned from this successful manufacturers line of automotive pistons. In the get a bigger hammer theory of things we rush out and buy a tricko battery that promises over 500 amps cranking power. This head came off an 80 CID engine that produced 101 horsepower.

To download our Evolution Big Twin machining services catalog or our head work sheet click here. Others that have owned EVOs may chime in. Trending at C 38743.

Automatic Compression Release ACR valves reduce the strain of starting your high performance motor by reducing cylinder compression - automatically. 1340 FORGED PISTONS - 1051 010. Also their high-temperature resistant knobs are charcoal colored for a.