Aug 11, 2000 · High compression ratio engines burn both much more cleanly and much more efficiently than lower-compression engines. For example, a diesel engine, which burns fuel …

Dec 11, 2002 · A high compression ratio is desirable because it allows an engine to extract more mechanical energy from a given mass of air-fuel mixture due to its higher thermal efficiency. …

Nov 3, 2010 · The compression ratio of the engine is a pretty simple concept. You take a space 10 units big, you squeeze it to 1 unit, and that would be a 10 to 1 ratio. Normal cars like the …

Apr 3, 2010 · Ok, so the compression ratio thread got me thinking. If Compression Ratios are determined by cylinder bore and piston length, wouldn't increasing the displacement of the …

Dec 31, 2010 · Compression ratio isn't the be all, end all for determining the required octane. Combustion chamber design plays a big role, too. You would have to ask people that are …

Oct 14, 1999 · Seems like they would require a lower compression ratio than diesels to ignite, and the engines would be less complex.

Dec 30, 2004 · Engine compression ratio - how does it affect performance and economy? Page 2 - Seeking answers? Join the AnandTech community: where nearly half-a-million members …

Dec 7, 2015 · Your low compression reading on a hot engine points to valves. But, did you check the cylinder head mating surface for flatness? You can squirt a bit of oil in the cylinders and …

Feb 1, 2000 · I found a compression ratio calculator here, but I don't know the cc on the B1 heads, can't come up with the 15:1 figure. But all else being the same, going from 4.375 to …

Dec 5, 2005 · The smallest amount theoretically able to hydro-lock an engine would be just slightly greater than the volume of a single cylinder when the piston is at top dead center. If …