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#231116 - 24th May 2008 8:54pm Petrol carís diesel twist
BMW Joe Offline
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Registered: 30th Apr 2006
Posts: 12369
Loc: Birkenhead
How Vauxhall is cleaning up its act with HCCI technology.




So, how exactly does the new powerplant work? The fact that GM engineers have been working for the past 10 years to perfect the Homogenous Charge Compression Ignition technology suggests there is no easy answer.

At its heart is the idea that a petrol engine can be made to work like a diesel. So rather than use a spark plug to burn fuel Ė as in a traditional motor Ė it compresses petrol until it becomes hot enough to burn unaided, and therefore more efficiently. HCCI units also direct some exhaust gas back into the cylinder to heat the incoming petrol-air mix, so it ignites as it is compressed (and further heated) by the piston.

Described in that way, the concept sounds simple Ė yet managing it is anything but.

Up to around half throttle and 3,000rpm Ė typical revs in traffic Ė the engine works in HCCI mode more economically. Above that, when the driver presses hard on the throttle, the engine automatically goes back into conventional spark ignition, to provide full power.

Currently, the system is 15 per cent more efficient Ė so a 2.2-litre unit could deliver well over 40mpg combined, in addition to lower emissions.

But challenges remain. We were told GM isnít yet satisfied with the systemís refinement Ė engineers want to smooth out the transition from HCCI to normal spark ignition modes.
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#231118 - 24th May 2008 8:57pm Re: Petrol carís diesel twist [Re: BMW Joe]
MattLFC Offline
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Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
Or you could just buy a diesel smack

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#231134 - 24th May 2008 10:41pm Re: Petrol carís diesel twist [Re: MattLFC]
BMW Joe Offline
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Registered: 30th Apr 2006
Posts: 12369
Loc: Birkenhead
Interesting development though.

Could mean high performance petrols could be as economic as a diesel?
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#231135 - 24th May 2008 11:00pm Re: Petrol carís diesel twist [Re: BMW Joe]
MattLFC Offline
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Registered: 14th Aug 2004
Posts: 22315
Loc: Moreton/Beirut/Mobile
It would have been interesting a few year's ago; but why the hell are they wasting money on oil machines when the world needs to move away from oil now and concentrate on alternative, greener and more renewable fuels.

smile

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#231136 - 24th May 2008 11:02pm Re: Petrol carís diesel twist [Re: MattLFC]
BMW Joe Offline
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Registered: 30th Apr 2006
Posts: 12369
Loc: Birkenhead
Well the concept was started 10 years ago lol

It's true though, they should be concentrating on alternative fuels
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