Is lower or higher compression ratio better?
A higher compression ratio (CR) is beneficial for engines. That’s because the higher ratio allows for an engine to extract more energy from the combustion process due to better thermal efficiency. Higher compression ratios allow the same combustion temperatures to be achieved with less fuel.
What does a higher compression ratio mean?
If an engine has a high compression ratio, it means that a given volume of air and fuel in the cylinder is being squeezed into a much smaller space than an engine with a lower compression ratio.
What does lower compression ratio?
Lowering an engine’s compression ratio has the exact opposite effect of raising the compression ratio. The benefits of lowering an engine’s compression ratio is an increase in volumetric efficiency, lower temperatures of the air-fuel mixture at the time of ignition and reduced likelihood of detonation.
In which cycle compression ratio is higher?
Although for a given compression ratio the Otto cycle has higher efficiency, because the Diesel engine can be operated to higher compression ratio, the engine can actually have higher efficiency than an Otto cycle when both are operated at compression ratios that might be achieved in practice.
Does higher compression require more fuel?
All things equal, engines with higher compression ratios require higher fuel octane. This is because a lower octane fuel may begin to ignite prior to the initiation of the spark event through the ignition system, a condition known as detonation or auto ignition.
Can you increase torque without increasing horsepower?
You cannot have horsepower without torque, but you can have torque without horsepower! The most simple means of increasing torque is to run an open exhaust and intake and tune properly. Torque value will increase right along with HP, so long as the tuning is performed properly.