What is the advantage of a hemispherical combustion chamber?

A HEMI® engine is composed of a hemispherical combustion chamber with dome shaped cylinders and matching piston tops. This creates less surface area than traditional engine which means that less heat and energy lost, and more power is produced.

Why are Hemi heads better?

A hemispherical head (“hemi-head”) gives an efficient combustion chamber with minimal heat loss to the head, and allows for two large valves.

Why do Hemis make more power?

With a smaller surface area than a typical flat-head engine design, less heat is able to escape. Because there is less heat loss, peak pressure is higher in a Hemi engine. Higher pressure means more energy, which in return will give you more power.

Is a Hemi engine faster?

The pistons in the HEMI’s block usually have a higher compression ratio, which quickly delivers more power to the vehicle. There’s no doubt a HEMI can significantly increase performance, but some drivers aren’t fans due to its design.

What are the disadvantages of a Hemi engine?

Most experts agree that a major drawback of the Hemi design is that it cannot incorporate four valves per cylinder. And that’s OK when it comes to racing cars, which are limited to two valves anyway – but modern cars use an alternative design with four slightly smaller valves that let the engine breathe more easily.

What makes a hemi so special?

What is so special about a Hemi engine? The Hemi engine’s unique design, which features less surface area, results in less heat loss. This means the engine’s peak pressure can be higher, which can result in better efficiency. Additionally, larger valves mean it’s easier for air to flow through a Hemi engine.

What is the life expectancy of a 5.7 hemi?

5.7 Hemi engines are good for 250-300 000 miles and more if properly cared for and regular maintenance is carried out. Early models suffered from valve seat issues which were rectified after 2008. It’s not uncommon to find high mileage 5.7 Hemi trucks running around today.