|27th May 2005, 11:48||#1|
Join Date: May 2005
Location: Vashi / Navi Mumbai
Thanked: 117 Times
Valves and bits, what's this ?
Since the dawn of euro emission norms, a lot has changed in the Indian automobile scene. Euro 1 saw implantation of catalytic converters in all cars. Euro 2 saw implementation of multipoint fuel injection (MPFI). Alongside the new fuel management system, some car manufacturers also increased the number of valves in the engine. For example, Maruti came up with something called 16x4 hypertech and upgraded all their engines to feature 4 valves (2 intake, 2 exhaust) per cylinder. Therefore, Maruti 800 with 3 cylinders became 12-valve MPI and the Esteem, Wagon R, Zen became 16-valve MPI engines.
However, Hyundai stuck to 2-valves per cylinder making their engines, 8-valve MPFI engines. Even the NHC features a 8-valve, iDSI engine. Does the number of valves in the engine improve performance and fuel efficiency or is it just another tech jargon to baffle the Indian customer?
Also, there is a big uproar about the bit-length of the microcomputer that controls the engine. Hyundai, Fiat, Opel, featured 8-bit ECUs, while only Maruti featured 16-bit ECUs. However, with the dawn of Bharat Stage III, both Maruti and Hyundai (eRLX) seem to have upgraded their ECUs to 32-bit.
Hyundai seems to be beating their own drum about their latest eRLX technology that empowers their cars with a 32-bit ECU. If the eRLX, indeed, features a 32-bit ECU, making a contradiction of the sorts is the fact that when I was going through their website a couple of months back, there was a section that convincingly explained why 8-bits are more than enough for the engine ECU, obviously trying to negate Maruti's reasons for installing a 16-bit ECU.
From Hyundai India website: http://www.hyundai.co.in/techtips.asp?pagename=customer
|27th May 2005, 12:09||#2|
Senior - BHPian
Join Date: Jul 2004
Thanked: 97 Times
As for the ECU's the bit's only stand for the processing power of the chips being used, however none yet knows what levels of usage of the chips processing power is directed to engine management and vehicle management. However larger bit's also mean more processing per cycle.
|27th May 2005, 14:41||#3|
Join Date: Apr 2005
Thanked: 9 Times
Yes the no. of valves does help with more easy breathing of the engine hence performance/efficiency will improve...Psycho said that already (I read it after typing the above line)
Btw Tata cars have 16-bit MPs as well..not just Marutis as mentioned in your post.