Harley Davidson Evolution Compression

Harley-Davidsons Evolution engine--- frequently referred to by riders as an Evo or Blockhead engine --- fueled increases in Harley-Davidsons overall sales and stock price for over 20 years after it first entered the motorcycle market in 1984The small Evolution engine permanently replaced the Ironhead engine and as of November 2010 is still being produced by the Harley-Davidson.

Harley davidson evolution compression. This carburetor had been modified using a standard DynoJet re. It works for awhile then we find out that the. The 1100 Evolution engine has a predictably higher maximum HP of 50 at 5500 RPM with a top speed of 1019 MPH.

Keith Black pistons kit dome top 951 compression standard bore for Harley Davidson Big Twin Evolution 80ci 1340cc. This will give the engine a mechanical compression ratio of almost 951. Harley-Davidson Part Number 29045-97 7495 045 Slow Jet Harley-Davidson Part Number 27170-89 495 The carburetor used on the 97 FXD was a previously dyno tuned carburetor from a 94 bike.

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. The 1200 Evolution engine has a maximum HP of 58 at 5300 RPM which is considerably higher than the abovementioned motorcycles.

The engine is built to stay together for a long time and provide a lot of runs Dahl says. Air-cooled Evolution Displacement 883 cm3 Bore X Stroke 30x38 in OR 76 mm Compression Ratio 881 Horsepower 536000 KWhpRPM Torque 494100 lb-ftRPM OR. This what a stock EVOLUTION combustion chamber looks like with stock sized valves.

Automatic Compression Release ACR valves reduce the strain of starting your high performance motor by reducing cylinder compression - automatically. However the heads have to come off and be drilled to install them unless theyre SS heads that are machined and plugged for them. 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.

Air-cooled Evolution Displacement 1200 cm3 Bore X Stroke 35x38 in OR 89 mm Compression Ratio 901 Horsepower 615500 KWhpRPM Torque 654000 lb. Changing the cam and upping compression on an Evo motor would be reason enough for compression releases. You dont need to machine the heads as deep as if you were using OEM.