With a given compression ratio, adding a longer-duration camshaft will decrease the cranking compression and therefore low-speed throttle response and power.

A compression ratio calculation is pretty straightforward, but involves a little math. So, grab your calculator and let’s crunch some numbers.

High compression however extends the range of injection timings where useful work output can be generated. The coefficient of variation of work output increases with increasing engine speed and ...

Check out this engine compression test, leakdown, and bubble tests. Read more only at www.highperformancepontiac.com, the official website for High Performance Pontiac Magazine!

James P. Szybist, Bruce G. Bunting, The Effects of Fuel Composition and Compression Ratio on Thermal Efficiency in an HCCI Engine, SAE Transactions, Vol. 116, Section 3: JOURNAL OF ENGINES (2007), pp.

We know we made you figure out your compression ratio the old-fashioned way, and you probably know that dyno software has a compression-ratio calculator built in.

A high compression ratio means you're squeezing tightly on the air-fuel mixture in the engine's combustion chambers, which in turn means more power and fuel efficiency.

The VC-Turbo can operate with a compression ratio as low as 8:1 for maximum performance or as high as 14:1 for maximum efficiency. The engine can even switch to the more efficient Atkinson cycle ...

Infiniti introduced the world's first variable compression-ratio engine, a technology it claims to have been working on for two decades, at the 2017 Los Angeles Auto Show. A variable compression ...

Nissan's variable-compression engine once held so much promise. The so-called VC-Turbo uses a complicated mechanism to allow operation at a low compression ratio for performance, and a high ...