Maybe I forgot the bad things?
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Yes. Diesels sound awful. Also, Diesels don't rev well so you have to run larger capacity to get the same HP so packaging and weight is a problem (the Audi R10 is a 5 or 6 litre for instance, compared with the 3.5 litre that the R8 was).WhiteBlue wrote:sound
If that is true, I may have to hold off on my search for a 2006 A4 Quattro 1.8t until then! Especially if they get the same 50mpg that the VW TDI's get.West wrote:Diesels don't sound too bad; at least not the R10. I remember watching the F430 GT in person and I thought it made a terrible sound.
I just can't wait till Audi releases their diesels in America next year.
You don't need such a large Diesel. A 2.0 diesel from BMW or Audi produces more than enough Torque (it's in excess actually) and you get extra fuel economy to boot. My dad's Saab 93 2.0 TDI gets over 50mpg with ease and still pulls like a train.West wrote:http://www.audiusa.com/audi/us/en2/expe ... i_TDI.html
Hopefully I will have enough money to put a down payment on an Audi A4 3.0 TDI. I have read reports that Audi diesels get up to 44 MPG.
Have you ever heard a 3 liter Ferrari F1 V12 engine screaming at 17,000rpm ?WhiteBlue wrote:... personally I do not care so much for sound. but I understand that F1 has to look at its traditional values and appeal to keep the fans happy.
The paper is loooong, so I won´t post all of it, if somebody wants it, just send me a mail adress in a PM and I´ll send itIn comparison to the smoother combustion of Otto engines the hard combustion of the diesel engine causes a higher rate of indirect noise emitted by the engine structure, due to the higher ignition pressure and the higher pressure gradient.
The heavy combustion stimulation is the reason for the characteristic, unpleasant acoustic behaviour of “Diesel Knock”. The high pressure gradient during the combustion is the main cause for this impulsecontaining noise. The periodicity of “Diesel Knock” is based on the ignition of cylinder, so it follows the 2nd engine order (4cyl. engine) as well as lower engine orders, due to differences between each single cylinder ignition. Therefore on a 6cyl. engine the 3rd and lower engine orders are dominating. Ignition delay and pressure gradient and within the “Diesel Knock” can be reduced by a common pilot injection, which leads to a smoother cylinderpressure curve.
Due to the load control by the injected fuel quantity at constant air amount the intake noise of a diesel engine is, in comparison to an Otto engine, less load dependent and therefore the driver gets little load feedback during the acceleration. As many turbocharged engines the diesel engine shows no acoustic increase on rising engine speed.
Figure 1 presents the result of a measurement in an example. Furthermore the maximal speed of the diesel engine is limited by the timeneed for mixture formation, ignition and combustion; dynamic highspeed noise can not be generated.
Figure 1: interior noise of a diesel powered vehicle. The little dependency of sound level and engine speed is well recognisable. There is no dynamic runup.
Yes, I almost did. Silverstone 1994 Berger and Alesi were at the wheel of the V12 engined Ferraris. The formula was 3.5L then. But I guess that wasn't so different in sound to the smaller 3.0 L V12 that only ran for one year 1995 before they switched to V10. I thought the Fords and Renaults were not bad either and they had better fuel efficiency. They all were incredibly loud. unprotected your head starts to hurt after half the race. people were really concerned when the V8 became mandatory but still the sound is overwhelming. as I said I don't care that much for engine noise. I agree that it adds to the fascination. the cars give an impression of brutality and danger. the only thing louder I ever heared was a Concord with afterburners lifting off at Heathrow while I was collecting my Rover from the car park that is directly along the runway. that thing was perhaps 100 m away and I thought it would blow my head off.Belatti wrote:Have you ever heard a 3 liter Ferrari F1 V12 engine screaming at 17,000rpm ?WhiteBlue wrote:... personally I do not care so much for sound. but I understand that F1 has to look at its traditional values and appeal to keep the fans happy.
) but there is a definite lack of torque in the mid-range. )
Johan wrote:Well, I was thinking about the Lemans. Audi is driving with diesel, and Peugeot as well. Is this something for the Formula 1? I prefer it, because a team can make less pitstops, and faster accelerating is also there.
Maybe I forgot the bad things?
They did run engines with variable valve timing. If I'm not mistaken Honda was the first one.Scotracer wrote:I wonder if the FIA will ever consider VTEC style systems to be allowed into F1 -- I wonder the impact that would have. I drive a 2000 Honda Integra Type-R and it is a blast to drive (oh and 9000rpm always sounds nice
Did any F1 team ever prototype a VVT system?
