Diesel Cars.
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Hmm.. i always wonder why cars tt run on diesels tend to have faster pick up speed then cars tt run on petrol..
Like Taxis & Cabby..
Before i know they zoom off once the traffic turn green...
Why huh?
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Here are some facts with regards to ur question, hope it may help you.Originally posted by bjork:Hmm.. i always wonder why cars tt run on diesels tend to have faster pick up speed then cars tt run on petrol..
Like Taxis & Cabby..
Before i know they zoom off once the traffic turn green...
Why huh?
One big difference between a diesel engine and a petrol engine is in the injection process. Most car engines use port injection or a carburetor rather than direct injection. In a car engine, therefore, all of the fuel is loaded into the cylinder during the intake stroke and then compressed. The compression of the fuel/air mixture limits the compression ratio of the engine. A diesel compresses only air, so the compression ratio can be much higher. The higher the compression ratio, the more power is generated.
Diesel fuel has a higher energy density than petroluem. On average, 1 gallon (3.8 L) of diesel fuel contains approximately 155x106 joules (147,000 BTU), while 1 gallon of petroleum contains 132x106 joules (125,000 BTU). This, combined with the improved efficiency of diesel engines, explains why diesel engines get better mileage than equivalent gasoline engines.
Got it from my studies in mech engg. -
i see so its all abt the combustion rate of petrol & diesel.. Thanks!
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HmmmmOriginally posted by bjork:Hmm.. i always wonder why cars tt run on diesels tend to have faster pick up speed then cars tt run on petrol..
Like Taxis & Cabby..
Before i know they zoom off once the traffic turn green...
Why huh?
How abt the simple fact that Taxi are mainly few types
1) Toyota Corona, 2l diesel
2) Toyota Crown, 3l diesel
3) Nissan Cedric, 2.7l or 3l diesel
4) Merc, 2.5l or 3l diesel
no sure abt specs of the other type of cabs... -
and dun 4get that all diesel engines generate torque at very Low Rpms....which is ideal for moving off quickly
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erm. then since diesel engines run faster and e diesel itself cheaper, y
doesnt everyone convert to diesel vehicles? -
diesel engines doesnt run faster then petrol its only advantage is tt its pick up is fast. On the long run, it will lose out to those vehicles tt run on petrol..Originally posted by Groovee:erm. then since diesel engines run faster and e diesel itself cheaper, y
doesnt everyone convert to diesel vehicles? -
to have a privately owned diesel vehicle, you pay 6 time the road tax to something called a diesel tax...
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Or it could simply mean that the taxi driver reacts and moves off faster.
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very basically, a diesel engine of the same capacity as a petrol engine has much higher max torque at lower revs.
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Ya, don't forgets poor acceleration and very noisy!Originally posted by HENG@:very basically, a diesel engine of the same capacity as a petrol engine has much higher max torque at lower revs.
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you're wrong. accel is decided by torque. The higher a vehicle's max torque is at lower revs, the faster it will be, taking into account vehicle weight as well.Originally posted by Lancer947:Ya, don't forgets poor acceleration and very noisy! -
thats y u see cars likr the Dodge challenger and the shelby mustang Gt500 has such LARGE amounts of torque at low revs (3000) and its something like 400ft lbs?Originally posted by HENG@:you're wrong. accel is decided by torque. The higher a vehicle's max torque is at lower revs, the faster it will be, taking into account vehicle weight as well.
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don't forget your gear ratios as well.Originally posted by HENG@:you're wrong. accel is decided by torque. The higher a vehicle's max torque is at lower revs, the faster it will be, taking into account vehicle weight as well.
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yeah lar....thats also one of the factorsOriginally posted by tailslide:don't forget your gear ratios as well.