Jul 4, 2005 - 6:59 PM
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Enthusiast ![]() Joined Dec 11, '03 From Monterey, CA Currently Offline Reputation: 0 (0%) |
This is just a general question that I'm sure someone will file under the "stupid questions" category, but for those of us who are "mechanically impaired", this might be useful.
OK, I was comparing the specs for the 5SFE and the 3SGE engines, and I saw that the 5SFE has a slightly higher torque rating than the 3SGE (145ft-lbs, and 142ft-lbs, respectively), but the 3SGE has a much higher HP rating than the 5SFE (177hp, and 135 hp respectively). Can someone can explain to me how this is possible? I figured that if the 3S had over 40hp on the 5S, then the torque rating would also be much higher. Also, if someone did a 5S to 3SGE swap, how much of a performance difference would they feel with the torque ratings being so similar? Any input is appreciated, and remember to be gentle, I'm mechanically impaired. -------------------- "To be the man, you have to beat the man..."
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Jul 10, 2005 - 4:57 AM
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Enthusiast ![]() ![]() ![]() ![]() Joined Mar 3, '05 From Richmond, B.C. Currently Offline Reputation: 0 (0%) |
Horsepower is energy output, while torque is pressure.
Think about it like water. Take the same amount of water, with the same initial speed. Run that water through a big hose, you get a lot of movement, whereas you run it through a small hose, you get a tighter, faster-moving stream. Same amount of water, different use. Same amount of displacement, different use. (That's not an accurate metaphor, but it gives you an idea of how you can utilize the same displacement and get totally different results). The 5SFE is a narrower head design meant to allow the same displacement to better overcome inertia and turn the wheels. The 3SGE head is a wider valve design that isn't as good at initially generating movement but is better at capturing every last bit of energy available, which is important at high speeds/high RPMs. Okay, better metaphor -- football player versus runner. Torque is why you'd rather get hit by the runner than the football player, even if they weigh the same. Horsepower is why the runner can outdistance the football player, though it takes longer for him to accelerate. |
SimmaDownNow Torque/ HP ratings Jul 4, 2005 - 6:59 PM
Hanyo In perforance car engines, you want high hp and hi... Jul 5, 2005 - 6:20 AM
darksecret You must also consider the cam profile is differen... Jul 5, 2005 - 2:39 PM
MonsterBOX its simply because the 5sfe is a 2.2liter block an... Jul 11, 2005 - 11:47 AM
Galcobar Ah ha...found what I was looking for:
http://vett... Jul 12, 2005 - 6:02 AM![]() ![]() |
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