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ukdave2002
Joined: 23 Nov 2007
Posts: 4104
Location: South Cheshire
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 Posted: Sun Jun 15, 2008 8:46 pm Post subject: diesel verses petrol |
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Am sending this from Le Mans where the diesel engine Audi's & Peugeot's have just claimed all the outright top places, in the 24hr race
The organisors saying that next year the diesel cars will have to be restricted so that its fairer on the petrol cars. Harve I missed something? Why is this ?since when was diesel a better racing fuel? |
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Penman
Joined: 23 Nov 2007
Posts: 4756
Location: Swindon, Wilts.
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| Posted: Sun Jun 15, 2008 9:51 pm Post subject: |
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Hi
Could it be that outright performance has now got so close, that diesels now benefit from fewer refueling stops, perhaps only doing refueling at driver changes. |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4104
Location: South Cheshire
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| Posted: Mon Jun 16, 2008 7:54 am Post subject: |
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I will look at the pit stop ratio, but the diesel cars got all the top grid positions and fastest lap time's!
Have there been recent developments in diesel technology to account for this? |
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peter scott
Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
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| Posted: Mon Jun 16, 2008 9:26 am Post subject: |
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The difference is not as great as I thought but diesel just has a larger specific energy content. So in terms of energy available for a specific volume you are better off with diesel. Have said that, petrol still gives a higher energy for a specific weight but maybe at Le Mans weight is less important than volume.
Sorry about the mix of units.
Petrol 150k BTU/Imp Gal. (specific weight 740kg/m3)
Diesel 166k BTU/Imp Gal. (specific weight 900kg/m3)
[/i] |
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Uncle Joe
Guest
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| Posted: Mon Jun 16, 2008 6:36 pm Post subject: |
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Diesels have always been far more efficient engines than petrol. Thanks to people buying them in greater numbers over the past few years, manufacturers have been pouring money into ''improving'' them.
So really, its nothing to do with the fuel...its consumer power! |
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Rick
Site Admin
Joined: 27 Apr 2005
Posts: 22446
Location: UK
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buzzy bee
Joined: 23 Nov 2007
Posts: 3382
Location: South Cheshire
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| Posted: Fri Jun 20, 2008 4:10 pm Post subject: |
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| Can't you get a pump from the same yard, or a recon one somewhere? |
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ukdave2002
Joined: 23 Nov 2007
Posts: 4104
Location: South Cheshire
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| Posted: Fri Jun 20, 2008 6:46 pm Post subject: |
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Seems mad when you can buy a new Ford KA for under £6K, that a fuel pump costs about 20% of the price of the whole car  |
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peter scott
Joined: 18 Dec 2007
Posts: 7118
Location: Edinburgh
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Scotty
Joined: 23 Nov 2007
Posts: 883
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| Posted: Sat Jun 21, 2008 2:11 pm Post subject: |
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| Rick wrote: | | I was shocked to hear a price on a new fuel pump for a diesel Ford Fiesta, something like £1200 quid! |
I bought a brand new Land Rover Defender Td5 Station Wagon in 1999 when they first came out and during its first service I got chatting to the service manager. As we chatted I discovered, much to my horror that this state-of-the-art diesel engine had injectors with direct computer control (my words, not theirs) that were £500 each to replace if they went faulty - and the Td5 had 5 of them!
Needless to say when the last week of the manufacturers 3 year warranty arrived it was traded in for a different car.
Brilliant engine though, best diesel I'd ever driven up until then. Currently, after two weeks of driving a new E320 CDI Merc with a V6 diesel I'd say that's my present star.  |
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wrinx
Joined: 22 Jun 2008
Posts: 142
Location: Derbyshire
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| Posted: Sun Jun 22, 2008 12:55 pm Post subject: |
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Manufacturers sell cars cheaply and make up their profit margins on parts.
Diesels make excellent road cars and they're showing their power on track too...hopefully that'll also blow away some of the old views about diesels 
I'm running a remapped 156 2.4 JTD with something like 190-200bhp and too many torques to mention, as my daily car. It is simply stunning!
Yes., it will probably cost a small fortune if it breaks down but I'll worry about that IF it happens ..and the parts will be second-hand...recycling 
wrinx
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www.alfaromeo155.co.uk | www.alfamatta.co.uk
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Greeney in France
Joined: 06 Mar 2008
Posts: 1173
Location: Limousin area of France
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| Posted: Sun Jun 22, 2008 1:32 pm Post subject: |
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I really dont know why; I have asked many times, the French are so keen on diesel there is probably a 60/40 diesel/petrol split so much so that petrol cars are probably 30% cheaper second-hand
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www.OldFrenchCars.com
We do these things not to escape life but to prevent life escaping us |
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