100:1
Diesel engine
There are various models of Mercury 90hp engines with different compression ratios. Typically, compression ratios for a 90hp Mercury outboard engine range from 9:1 to 10:1. It's best to consult the specific model's technical specifications for accurate compression ratio information.
mpeg4 is video
Compression ratio in engineering can be calculated by dividing the total volume of a system before compression by the total volume after compression. In computing, file compression ratios are calculated by comparing the original file size to the compressed file size.
For a conventional gasoline engine, the higher the compression ratio, the more efficient the engine. US passenger cars have not had very high compression ratios for about 30 years for multiple reasons. During 1970-1972, Chrysler had the highest compression ratios in US production cars, requiring the highest octane gasoline to operate properly.
The difference from MP4 and MPEG4 is that MP4 is a sound type of file for pcs and MPEG4 is a movie format designed for some pcs and ipod/iphones
Different engines - different ratios, but commonly around 8 to1.
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General compression techniques look for repeated patterns which can be compressed to a single iteration of the pattern. A data stream with high entropy will have relatively few repeated patterns, and will decrease the compression ratio.
The higher the compression ratios produce more power. The more fuel is compressed, the more likely it is to spontaneously burst into flame.
spark ignition itself can easily burnt the air fuel mixture hence the high compression ratio is not needed.