Vehicle Compression Ratio Explained
Q- Whats a Compression Ratio?
A- Volume of the cylinder with the piston at the bottom dead center compared to the volume of the cylinder with the piston at the top dead center.
Cylinder Head Explained
• Power is generated by increasing and decreasing the compression ratio
• The lower the compression, the lesser the power generated and the higher the compression, the better the power is generated.
Lets see the different variants of Compression by Manufacturers
- RE Classic 500 Compression 8.5:1 "Average Compression"
- RE Interceptor 650 Compression 9.5:1 "Good Compression"
- Kawasaki Ninja 300 10.6:1 "Nice Compression"
- Kawasaki Ninja 1000 11.8:1 "Cool Compression"
- Kawasaki ZX10RR 13.0:1 "Dope Compression"
- Big J Custom Cycles Ltd Belle 15.0:1 "Double Dope Compression"
Factors effecting compression ratio
- Displacement---> Bigger bore x Stroke
- Dish Size can impact compression (Piston Shape).
- Deck height
- Head Gasket
- Cylinder Head Displacement.
Deck height impacts on compression
Q- Whats a Deck height?
A- At the Top Dead Center, How the piston is in relation with the deck surface. Which is where the cylinder head bolts on. Its recommended to have an even deck height.
Types of Deck Height
Q- How head gasket can impact compression ratio?
A- The head gasket holds the engine head & Cylinder block. A bigger gasket bore can reduce compression. at the same time gasket thickness can also lead to a lower compression ratio.
Please note:- Cylinder head displacements impacts compression also.
Few Videos on Compression ratio