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Re: Benefits of higher compression?.
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Posted by buickanddeere on June 26, 2004 at 20:40:03 from (64.10.41.174):
In Reply to: Benefits of higher compression?. posted by Jonathan on June 26, 2004 at 08:32:41:
Bob M and Neil have the compression ratio info down as well as anyone there. More CR lets the engine (a mechanical device) extract more energy from a unit of fuel by increasing the expansion ratio. It's why the later steam engines were "compound" with a 2nd larger cylinder on the exhaust of the primary cylinder. Extreme spark ignition compression ratios allow the exhaust valve to be opened early to improve cylinder purging/breathing without losing power on the power stroke. And having more fresh airful mixture in the combustion chamber with less exhaust residue. Combustion and steam turbines can be very efficient due to thier expansion ratios being many time more than a reciprocating engine. On large ships a steam turbine was aften attached to the exhaust of the multistage piston engine to wring the last bit of heat/pressure from the steam.
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