Quote:
Originally Posted by arakis
ahhhhm, you forgot about a little thing called a gearbox or final drive, and an engine tat revs up to 8000 rpm will have twice the reduction ratio of an engine that has 4000 rpm rev limit. giving the faster engine twice the torque at the wheels at the same speed as the slower reving engine.
|
maybe... but why is that ?
Isn't it that in order to achieve higher RPM, the motor has to be more balanced and to better achieve that a less energetic power stroke is welcome ?. Transmission have a "reduction ration" and a "multiplier ratio"... reduction is when the transmission output shaft has a lower rev ration compared with the "motor" input shaft. Its only there to
REDUCE THE LOAD on the engine and permit a faster transition to more RPM and power... "multiplier ratio" is when the output ratio has more revs compared with its input... in order to sustain higher orders of "SPEED"...
So its logic that higher RPM, 8K RPM or more, need higher reduction ratios to make easier and faster to achieve those levels, than an engine that has half the RPM for the same power envelope...
Quote:
Originally Posted by arakis
as for the diesel being a better fuel chemicly, from your statment above you proved your self wrong. because that small f1 engine with 1500hp, would leave the diesel prototyes so far behind that it could go into a pitt refuel, change the tyres, and the driver and let him have a cup off coffie and still lead the race, at le mans that is, do you have any idea how much of an advantige 1500hp woulg give anyone at le mans, that would be like 10-15s a lap
|
sorry i can't resist... why wont they invest in them then ???
Perhaps because that was when the F1 cars were below 500Kg... you have a hard time getting this... those engines wouldn't last a 3h race, and would consume a full tank every 7 laps in Le mans... so they would have to be considerably faster than the best diesels now to have any chance. But now if you put almost the double of weight and by doing so, almost the double load on the car engine, i'm very doubtful that those engines would be able to attain those levels of power... not even close by a long shot!
actually diesel is not better chemically than gasoline, race grade gasoline for that matter, though even ACO claims that diesel has more 10% BTU per volume of fuel... the reason for the 9 liter less tank rule. IMHO it misses rigorous testing but the BTU is identical, though i can accept a tiny little advantage on diesel.
Where diesel is far superior for a ICE is in its physical proprieties permitting much higher order of compression without self detonate... "knocking"... and so much better thermodynamic efficiency.