KFL Racing Enterprises - Kicking your ass since 2008
*cough* http://theitalianjunkyard.blogspot.com/ *cough*
KFL Racing Enterprises - Kicking your ass since 2008
*cough* http://theitalianjunkyard.blogspot.com/ *cough*
That aside, the V8 and the V12 are quite different. One is (was) a turbocharged pushrod engine with 2vpc and the V12 is a modern normally aspirated unit with direct fuel injection and 4vpc.
However as far as the ultimate smoothness is concerned I'm sure the V12 is better, since it's a more inherently balanced configuration than the V8. And as for the power, well the V8 is turbocharged so despite the deficit in technology it can make it up with boost.
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I think I've already answered somewhere in this forum the differences between engines with the same displacement but different number of cylinders and vice versa, same displacement per cylinder but different number of them.
I don't have my notes and books on the subject here with me now, so I'll pass the calculations and precise ratios, but theoretically, which is quite far from the reality, a V12 would be more powerful than an equally sized V8 or even V10, V6, I4, B6 and so on.
that's true only in an ideal word, and with similar engines taken into count, so forget about comparing a turbocharged one and a naturally aspirated one.
In the real world, petrol engines, especially NA ones, and even more those without direct injection, suffer of a too large bore due to flame quenching and other issues resulting in an extinguished flame front. That's why naval engines and power generators usually are diesel ones.
then, quite obviously, every cylinder requires a number of auxiliary mechanisms reducing the overall efficiency, so the more cylinders you have, the less efficient, mechanically, the engine will be.
that's why we don't have 2 liter V12, even if they existed. iirc, Connaught was programming a 2 liter V10 now that I think about it.
An high specific power is very difficult to obtain in a large displacement engine, for a combination of those two factors also, and the same is for its revving capability, due to the weight of the masses that has to be moved.
Consider the specific displacement with a 6 3/4 liter engine, a V12 is of course a better engine, from a theoretical point of view. but the differences between each engine could be so many that perhaps even an I4 could be better than the V12 in the end.
without even considering electronics.
KFL Racing Enterprises - Kicking your ass since 2008
*cough* http://theitalianjunkyard.blogspot.com/ *cough*
Hey, can a mod change the thread title? It seems a little stupid to be calling it "My" technical Questions Thread. Just lop off the My. It's better if the thread belonged to everyone.
changed.. i was actually thinking of doing that yesterday anyway, but since you asked it just validated my thoughts. so cheers.
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Question, do Top Fuel Dragster obey to any kind of limiting regulations? apart from safety? Engine size etc? i know that they had a limit on fuel nitro mixture.
Is Top Fuel the fastest a 'car' can accelerate?
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Lot's of rules just like any other class. The engine displacement is set. The engines must use a belt driven supercharger, no turbos. They can not use computer controlled clutches.
To the best of my knowledge they are the fastest accelerating wheel driven car. That is some other things might accelerate faster but they don't do it via rubber on the road.
Here are some more fun ones:
This list has been around for a while and I don't know the original source
And some more from Paul Van Valkenburgh
Horsepower measured from the driveshaft torque (actual measured power, not estimated or dyno) was 6000hp off the line and peaks just under 8000hp.
Engines run 40% more fuel than they can burn. The extra fuel is used to cool the motor. His article quotes 70gpm flow rate. But the fuel pumps are variable to control power. It takes 30hp to drive the pump.
The other article states that a HEMI motor couldn’t drive the supercharger. This article supports that saying it takes almost 800hp to drive the air pump. For calibration they spin up a 1700lb flywheel to 8000 RPM then engage a clutch driven overdrive that spins the supercharger 11,500RPM. Peak boost is about 50psi.
Downforces: As the car starts the tires wind up and the rear of the car drops. Almost immediately afterwards the rear starts to rise as the tires grow. The lifting of the rear of the car can add an extra 2000lb of downforce on the contact patch for a fraction of a second. The author also noted the force of the exhaust and said that he was almost knocked over while standing near a starting drag motor.
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