Similarities between gas and diesel? - Mercedes-Benz Forum

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post #1 of 16 (permalink) Old 10-04-2006, 05:48 PM Thread Starter
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Similarities between gas and diesel?

hey everyone,

I'm writing this essay for my writing class and it has to be a compare/contrast essay and I chose gas [engines] vs. diesel [engines]....I know a lot of differences between the two...but i cant think of very many similarities...can you?

let me know,


Thanks,

Kris

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post #2 of 16 (permalink) Old 10-04-2006, 06:00 PM
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It powers a car.

Is burnable. Smells. Has fumes (presumably).

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post #3 of 16 (permalink) Old 10-04-2006, 07:23 PM
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You can't tell the difference between modern diesel and modern gasser by listening to them.
The difference on the road will be, that diesel will keep the rpm even on steep grades and will accelerate to pass on the same gear, while gasser usually needs downshifting.
Than you can tell the difference by following the car >>> diesel passes lot of gas stations where gasser needs to stop.
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post #4 of 16 (permalink) Old 10-08-2006, 09:35 PM
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Both are internal combustion engines.....other than that...humm.

The diesel is of higher compression and it gets it ignition (detonation) from the heat of compression. Heat is a good thing for a diesel.

The gasoline engine is of less efficiency as heat is a nessesary evil. Ignition is provided by spark plugs.

The diesel engine is low in horsepower but high torque, thus it is the better hill climber and load carrier.

The gasoline engine is high in horsepower and lower in torque than the diesel. (this will get them going)

The diesel engine is, and always will be the noiseier of the two due in part to its detonation (dieseling). (this will get them going)

Gasoline engines are considered the more practical choice for automobiles.

I like diesels a bit more, but own both.

Michael

Last edited by my90300E; 10-08-2006 at 09:37 PM.
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post #5 of 16 (permalink) Old 10-08-2006, 10:57 PM
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Quote:
Originally Posted by my90300E

The diesel engine is, and always will be the noiseier of the two due in part to its detonation (dieseling). (this will get them going)
Welcome to the 21 st Century.
Moder diesels have multi-stage injection that prevents big detonations. Even in mid-price range cars the cdi diesel is hard to hear.
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post #6 of 16 (permalink) Old 10-09-2006, 04:13 AM
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Yes, one should take the recent diesel technology enhancements into account. I think it is still true that a diesel engine is more noisy but the difference is getting small, especially on a warmed up engine. In a good car you cannot say from inside (based on noise) which engine it has. Also powerwise the engines are getting similar (excluding the top range of gas engines, which perhaps though is more visible in the US). When the W211 had the I6 320CDI and the 320 gas engine, they had excatly the same acceleration figures even if the gas engine had a bit higher max power, here in Europe they had the same price tag too. I think the difference with the V6 320 CDI and the current 350 gas engine on the W211 is still quite small. Don't know if this reduces the longevity advantade that diesel cars have had so far.

Considering the earlier comment "gas engines are considered the more practical choise for automobiles", I wonder why then the 2005 figures indicate that in Belgium 72% of their car sales were diesels. France had 70%, Spain 68% but some European countries have really low figures like Greece 1% and Sweden 9%, the average being 49% (perhaps the comment was referring to this figure being less than 50% ;-) Of course the average for the whole world is different, heavily influenced by the US figures.

I accept that my views may be a bit biased but I have not always had a diesel car myself, had a gas engine car before my W123 diesel (although followed by a W124, W202, BMW diesel, W210, w211 and W221 diesels). But before the W123 i got used to my farther's cars which were of the two previous generation diesel MBs ;-)
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post #7 of 16 (permalink) Old 10-09-2006, 09:17 AM
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Quote:
Originally Posted by Kajtek1
Welcome to the 21 st Century.
Moder diesels have multi-stage injection that prevents big detonations. Even in mid-price range cars the cdi diesel is hard to hear.
I had anticipated such remarks from the hearing impared.

While MSI does REDUCE detonation into smaller increments diesels will always be louder due to the characteristic of them....DETONATION.

Thank you for your welcome into this century, I offer you a ride on my buckboard

Michael
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post #8 of 16 (permalink) Old 10-11-2006, 12:23 PM
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I agree with Michael apsolutely.
(worked 6 years for MB in Stuttgart - Baden Wuertenberger and 7 years for VW - Hanover)
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post #9 of 16 (permalink) Old 10-11-2006, 12:28 PM
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One more small thing:

Diesel Economy
Mythical Fuel Savings
The decision to purchase a diesel W210 should not be made on the basis of fuel savings. The turbodiesels are about $5,000 more expensive used than comparable E320s. To come out ahead financially, you’d first have to recoup through fuel savings your initial $5,000 outlay. The numbers just don’t work out under any reasonable scenario. Let’s make some assumptions:
• You’d get 28 MPG on the highway with an E320 gas.
• You’d get 35 MPG with an E300 diesel.
• You pay $3.15 for a gallon for premium unleaded gasoline.
• You pay $2.90 for a gallon for diesel. (Diesel is actually more expensive than premium gas in some parts of the country.)
Under these assumptions, gas for the E320 would cost $0.11 per mile and diesel for the E300 would cost $0.08 per mile. The diesel would reduce your fuel costs by about 3 cents per mile. To simply break even after paying the $5,000 premium for the diesel engine, you’d need to drive the car about 150,000 miles. Assuming you drive 10,000 miles per year, that would take 15 years!

My 2 cents: Here in NC you need to pay 25 cents more for diesel, so for me will be more like 30 YEARS of driving just to offset price difference.
I will stick with my E320.
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post #10 of 16 (permalink) Old 10-11-2006, 06:03 PM
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Leaving aside the economics (which will differ, e.g. in Germany Diesel fuel is much cheaper than regular gasoline), from an environmental point of view a diesel doesn't burn as clean as gasoline. Apart from particulate matter (which modern diesel filters can minimize), burning a gallon of diesel will generate more C02 than burning a gallon of premium. You'd need a fuel savings of around more than 15% percent to compensate for the increase in C02 output compared to the same car powered with an equally powerful gasoline engine.
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