Illini_152 From United States of America, joined Jan 2001, 1000 posts, RR: 2 Reply 5, posted (11 years 8 months 2 weeks 19 hours ago) and read 623 times:
And if you want to get real technical, displacement is the bore * stroke * # of cylinders. Bore is the inside diameter of the cylinder, and stroke is the distance that the piston travels during one revolution. A larger engine will produce more torque for a given RPM, but there are ways to get more power out of a small normally asperated engine. These generally involve winding them to a real high RPM.
Indy cars manage 800hp out of a 1.9L engine. Of course, they're turbocharged and running on pure ethenol. And turning at around 14,000 rpm.
Interestingly, horsepower is a fabricated number that Watt came up with based on how much coal he thought a mine Mule could haul in a givin time- 33,000 lb-ft/minute. An interesting site for questions like this is How Stuff Works-
Happy contrails - I support B747Skipper and Jetguy
NKP S2 From United States of America, joined Dec 1999, 1714 posts, RR: 5 Reply 7, posted (11 years 8 months 2 weeks 10 hours ago) and read 588 times:
Righto 'Fordlover' on the displacement calcultion...and I agree there's no replacement for displacement- in a pragmatic sense anyway. It should be noted that advertised Horsepower and Torque specs do not always tell the full story- They're just a "snapshot" at the peak of a curve and may not be indicative of the shape of the curve and how much usable power is available in most driving conditions. Generally, an engine with a broader powerband will be more satisfying to drive than one with a more "peaky" powerband. As the old hotrod adage goes: "Horsepower sells cars - Torque wins races". Horespower IS torque...but it depends on how effectively it is applied.