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Engine capacity vs power


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doofesh
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May 16, 2012, 4:08 AM

Post #1 of 8 (1970 views)
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How is it that a smaller engine can produce more power?

For example, the Skoda Superb v6 3.6 Litre engine produces 260 horsepower, while the Hyundai Genesis Coupe 2.0 litre engine produces also 260 horsepower. Does this mean that the Genesis is more fuel efficient?

Also, does a larger capacity engine have an advantage over a smaller one? Regarding fuel efficiency, isn't it true that the maximum fuel the Superb would burn at some point is 3.6 liters , while the Genesis Coupe would burn only 2 liters maximum(so it uses a less amount fuel)?


(This post was edited by doofesh on May 16, 2012, 4:27 AM)


Tom Greenleaf
Ultimate Carjunky / Moderator


May 16, 2012, 10:20 AM

Post #2 of 8 (1906 views)
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It's all in the engineering and what the people want and will buy. If you want fuel efficiency you aim for that and usually sacrifice HP. If you just want more HP you can play with how fuel is delivered, compressed and exhaust. Things like turbo charging are effectively force feeding the engine more that atmospheric pressure would give you making it behave as more displacement. If you want insane durability it may sacrifice fuel economy.

If you recall the air cooled VW Bug flat 4 cyl I was at a race track and without hiding some huge engine a guy or shop custom machined the engine such that it won that day doing a 9 second 1/4 mile! That's VERY fast if not familiar with times for that game. Engine may have only lasted a few races though - dunno and couldn't go talk to them but saw that in person. May not have used "gasoline" as the fuel either?

Lots of engineering and testing with compromises for what an engine can and will do. Factor efficiency, power, durability, price and demand for selling it all play a part. No Skodas sold in US that I know of. The US demands that a vehicle meet tons of specs to be sold here and many companies just won't do it,

T
_________________________________________
Long retired now


nickwarner
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May 16, 2012, 9:27 PM

Post #3 of 8 (1879 views)
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Don't look at the horsepower only, look at the RPM level it is at and what the torque rating of the engine is. A small engine with a short stroke and little pistons will rev like crazy and can make nice HP but only at ungodly high revs and with almost nothing on the low end would be worthless on the street. Bear in mind that I can pull an 80,000 gross weight on a semi down the highway doing maybe 1500 RPM and the engine is only rated at 350hp. But it puts out 1000 foot-pounds of torque and thats why it can do what it does and last a million miles before it gets ovehauled if its properly operated and maintained.


Tom Greenleaf
Ultimate Carjunky / Moderator


May 17, 2012, 6:56 AM

Post #4 of 8 (1871 views)
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Crack me up. Bought new, a '78 Honda 550 Four K bike that red-lined at something insane like 12,000 RPM! Say what! Freaking thing would do 70+ MPH in second gear if your arse stayed on the thing! Wanted the 750 but it was a bit taller and was more insane no doubt but I could put both of my heels on the ground on the 550 so I bought that one.

I know they make much more insane stuff now but that frickin bike was a nuke with power as it was for me. Always weighed nothing myself so it flew and would have with minimal wings.

Had to get a "sissy" bar for the back as I was losing passengers! Not into speed really but it was fun and amazing until what we call is a June Bug hit me like a cannon ball in the chest at some ungodly speed was like an elephant rifle shot!

OMG and more now than then,

T
_________________________________________
Long retired now


Tom Greenleaf
Ultimate Carjunky / Moderator


May 17, 2012, 8:01 AM

Post #5 of 8 (1865 views)
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This is actually my buddy Nick and his bike. Traffic? No problem.............

http://www.youtube.com/watch?v=IxjhbtYwcpo

LMAO,

Tom


Discretesignals
Veteran / Moderator


May 17, 2012, 8:59 PM

Post #6 of 8 (1841 views)
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Tom where did you get that video of me being late for work??



You forgot to factor in the turbo charger on the Genesis's 2.0L if the Skoda is naturally aspirated.

Would you pay around $60,000 for a Hyundai







Since we volunteer our time and knowledge, we ask for you to please follow up when a problem is resolved.

(This post was edited by Discretesignals on May 17, 2012, 9:13 PM)


nickwarner
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May 17, 2012, 9:27 PM

Post #7 of 8 (1829 views)
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I don't normally ride like that, but have you ever gotten on the road and within a few minutes realize you REALLY REALLY REALLY need to take a crap? That was what happened.


Tom Greenleaf
Ultimate Carjunky / Moderator


May 18, 2012, 10:50 AM

Post #8 of 8 (1815 views)
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Drove quite a bit one of 500 made Merc. Cougars with some unknown HP as they lie. Said 400 or so - Bull. Was 427 "R" coded (1968)

Thing would make you lips curl! Everyitng chrome underhood. Factory done - no games. INSANITY ON WHEELS! Have been told a mint one is a MIL $$ car right now!
_________________________________________
Long retired now




Engine capacity vs power


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