Has vtec had its day?
10-03-2010, 12:36 PM
#21
Originally Posted by MB,Oct 3 2010, 11:50 AM
PS - M badges on non M cars is extremely sad, enough to make me shake my head at them.
You can get M sport versions of most BM's, if not all, even small capacity diesels, so a great many of the cars you're talking about probably carry the M badge quite legitimately.
Anoraking over.......
10-03-2010, 12:40 PM
#22
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Originally Posted by gaddafi,Oct 3 2010, 08:28 PM
why would something 'smaller' and 'more efficient' be better?
Especially given the German power war between BMW/Merc/Audi etc
10-03-2010, 01:39 PM
#23
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Originally Posted by Fatbloke,Oct 3 2010, 08:36 PM
Anorak case warning..........
You can get M sport versions of most BM's, if not all, even small capacity diesels, so a great many of the cars you're talking about probably carry the M badge quite legitimately.
Anoraking over.......
You can get M sport versions of most BM's, if not all, even small capacity diesels, so a great many of the cars you're talking about probably carry the M badge quite legitimately.
Anoraking over.......
10-03-2010, 02:22 PM
#24
UK Moderator
Essentially it comes down to meeting the latest Euro V emissions regulations. These cover the obligatory CO2 limits, but also include NMHC and Particulate Matter (PM) for the first time for petrol engines
Thinks like the K20A as fitted to the CTR do not meet these regulations, and it seems that the easiest way to meet them and still make good power is to use turbocharging.
Someone cleverer than me might be able to explain why that is.
Thinks like the K20A as fitted to the CTR do not meet these regulations, and it seems that the easiest way to meet them and still make good power is to use turbocharging.
Someone cleverer than me might be able to explain why that is.
10-03-2010, 03:06 PM
#25
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Originally Posted by TangoVTEC,Oct 3 2010, 08:53 PM
The common by-products created during combustion (heat, light, sound, gas etc) are all but wasted in our engines, the only useful product is the gas expansion driving the cylinders, where as in a modern, common rail turbo diesel engine the heat and gasses produced trigger the ignition and drive the turbo, yielding the concurrent efficiency gains.
The turbo creates backpressure on the exhaust gasses and resists the exhaust stroke.
However, where a turbo gains, the induction is now taken care of by a rotary device which is much more efficient than a reciprocating device.
10-04-2010, 01:25 AM
#26
Originally Posted by gaddafi,Oct 3 2010, 07:39 PM
will someone tell the Americans?
they still seem to build plenty of cars with relatively simple large capacity V8s
they still seem to build plenty of cars with relatively simple large capacity V8s
Has VTEC had its day?
Depends what you mean by VTEC; there are at least 3 variants and variable cylinder management may survive.
The S2000-style big revs engines are passe, it's true. Not least because of the NoX at very high RPM.
Complex, cumbersome systems such as A-VTEC, Valvetronic, Multiair etc are great for NA units, but the advantages are somewhat lost with FI; gain 10% all round by losing that unaerodynamic butterfly valve, then stick a turbine in the airstream!
It may all be irrelevant, if the move toward IC donkey engines (as in the eEvora 414 and the Jaguar C-X750) becomes a reality.
10-04-2010, 01:59 AM
#27
Originally Posted by Ultra_Nexus,Oct 3 2010, 03:06 PM
You were right about the homogenous combustion bit, but wrong about the turbo bit.
The turbo creates backpressure on the exhaust gasses and resists the exhaust stroke.
However, where a turbo gains, the induction is now taken care of by a rotary device which is much more efficient than a reciprocating device.
The turbo creates backpressure on the exhaust gasses and resists the exhaust stroke.
However, where a turbo gains, the induction is now taken care of by a rotary device which is much more efficient than a reciprocating device.
I couldn't think of what to say!
Oh, and Gaddafi, you had an E39 M5 too?
Oh, I miss the torque!
10-05-2010, 06:19 AM
#28
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Originally Posted by Nick Graves,Oct 4 2010, 01:25 AM
Complex, cumbersome systems such as A-VTEC, Valvetronic, Multiair etc are great for NA units, but the advantages are somewhat lost with FI; gain 10% all round by losing that unaerodynamic butterfly valve, then stick a turbine in the airstream!
I'm on it!
10-05-2010, 07:26 AM
#30
It's all yesterday's technology.
My money's on the development of Tesla's (as in Nikola Tesla and not the car manufacturer...) magnetic resonant transmission of electricity. That means electric cars without batteries or onboard generation, receiving power from nuclear reactors 'somewhere'...
My money's on the development of Tesla's (as in Nikola Tesla and not the car manufacturer...) magnetic resonant transmission of electricity. That means electric cars without batteries or onboard generation, receiving power from nuclear reactors 'somewhere'...