I thought we were talking generally??Originally Posted by Slicks
Please would you explain to me how, for example, a 5.7 LSD putting out 330bhp say would match the economy a 3.2 BMW straight six putting out same power?
I thought we were talking generally??Originally Posted by Slicks
Please would you explain to me how, for example, a 5.7 LSD putting out 330bhp say would match the economy a 3.2 BMW straight six putting out same power?
How can men use sex to get what they want?
Sex is what they want. - Frasier
because they use that power to potter on at 60 mph, doing 1200 revs....Originally Posted by derekthetree
"I find the whole business of religion profoundly interesting, but it does mystify me that otherwise intelligent people take it seriously." Douglas Adams
aah, now I am enlightened, I realise the folly of my argument and of course rescind to the greater knowledge of my learned cousin (metaphorically)Originally Posted by henk4
How can men use sex to get what they want?
Sex is what they want. - Frasier
Because it's a cheap and easy way to increase power? But anyway the Koenigsegg CCX produces 806bhp with "only" 4.7-litres...Originally Posted by Slicks
Lack of charisma can be fatal.
Visca Catalunya!
A higher HP/L rating leads to more fuel being wasted per HP made...
A simple example:
You have two cylinders, both have 1:1 bore:stroke ratio. However one cylinder is 150cc and the other is 875cc.
150cc cylinder:
12.5:1 compression ratio
12.5:1 air:fuel ratio
Valve timing set for large amount of overlap.
206:HP/L (31hp)
Amount of energy lost: 65hp (includes wasted energy from excess fuel compared to 14.7:1 A:F ratio)
875cc cylinder:
10:1 compression ratio
14:1 air:fuel ratio
Valve timing set for small amount of overlap
72:HP/L (63hp)
Amount of energy lost: 113hp (includes wasted energy from excess fuel compared to 14.7:1 A:F ratio)
Now hopefully we all know that the amount of heat transferred per unit time is effected by the temperature difference. So my first question is which cylinder has hotter air in it? and therefore loses more to the surrounding enviroment? Next look at the air:fuel ratios the bigger cylinder can aford to use 10% less fuel per unit air there alone. Notice that the little cylinder throws away 2.1hp for every useful 1hp it makes whereas the big one only throws away 1.8hp.
get my point?
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
Generally, IRL?Originally Posted by derekthetree
The 3.2L I6 will most likley get worse gas milage in everyday driving, probably at WOT too, being that it has to rev much higher to make the same amount of power.
BMW I6s are magic anyways...
Biased
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
but on each stroke the v8 will be using that much more fuel...Originally Posted by Slicks
something we can agree onOriginally Posted by hightower99
How can men use sex to get what they want?
Sex is what they want. - Frasier
If hp/l matters so much though, why would they increase displacement? Why are there no cars powered by the 1 cylinder RC car engines, with their amazing hp/l?Originally Posted by Ferrer
And "only" twin superchargers running over 17psi of boost. Id love to know how much one of those engines costs.But anyway the Koenigsegg CCX produces 806bhp with "only" 4.7-litres...
While the I6 is revving much higher, consuming fuel.Originally Posted by derekthetree
yes. but others and i are saying that a large engine, revving slower will consume more fuel than a smaller engine revving higher.Originally Posted by Slicks
because their overall power and torque are poorOriginally Posted by Slicks
How can men use sex to get what they want?
Sex is what they want. - Frasier
Slicks you need to relax everyone here KNOWS that HP/L ratings doesn't mean anything and that it doesn't make one engine better than another...
But some people think that you think that FI sucks because in you POV it increases HP/L (It doesn't FI increase the "true" displacement of an engine without a physically larger block)
I know you aren't against high HP/L engines you are against the dumb guys who think that there S2000 with it's 120HP/L can take anything...
I for one agree with you!
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
I was reffering to nota's post about RC engines. Each one of those manufacturers use a different dyno test so their numbers are basically meaningless. The only thing that maters with those tiny engines is their real world performance. Most RC car engines have a true amount of power that is about 60-80% less than the manufacturers claimOriginally Posted by hightower99
eat cicada
I hope you realise that forces tend to increase linearly with increases in weight and porportionaly with increases in speed...Originally Posted by derekthetree
The higher you rev the less air you tend to keep in the cylinder for combustion while the amount of fuel injected increases.
The lower your revs the easier it is to keep a full cylinder's worth of air in for combustion and the fuel injected is decreased
higher revs = lower effeciency, more power
Lower revs = higher effeciency, less power.
Power, whether measured as HP, PS, or KW is what accelerates cars and gets it up to top speed. Power also determines how far you take a wall when you hit it
Engine torque is an illusion.
Yes. I have one with the same amount of displacement and I will agree that they are very fast. But they are helpded out alot with their somewhat unconventional fuel (mixture of nitromethane,methane, and oil) and the fact that they only weigh a few pounds.Originally Posted by ruim20
eat cicada
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