If this is your first visit, be sure to check out the FAQ by clicking the link above. You may have to register before you can post: click the register link above to proceed. To start viewing messages, select the forum that you want to visit from the selection below. |
|
|
Thread Tools | Display Modes |
#1
|
|||
|
|||
why diesel engines are having hight torque comparing with the same size of Petrol Engines ??
Well , im trying to have your opinons buddies , im doing a small search bout this subject . so anyhelp . i got a lot of stuff but still wondering how the torque can have direct effect on the engine . waiting al ur replies . 10x advance , |
Ads |
#2
|
|||
|
|||
why diesel engines are having hight torque comparing with the same size of Petrol Engines ??
|
#3
|
|||
|
|||
why diesel engines are having hight torque comparing with thesame size of Petrol Engines ??
|
#4
|
|||
|
|||
why diesel engines are having hight torque comparing with the same size of Petrol Engines ??
Everyone is all hot on torque, but what matters is power. You just have
to shift down to get the power you need. Look at the rock crawlers, they have gears so low they can go 1 mph at 5000 rpm! Power is what you need. Torquey motors give good power at low rpms, which is a kick I guess. Diesel fuel has more btus (watts) per gallon than gasoline. Diesels engines can be run at higher compression ratios because engines wont ping with the diesel fuel. I think just about all diesel engines are fuel injected (but so are gas now). Anyway, both work. Personally I don't like the noisy, dirty, stinky diesel (prefer gasoline), but they do work well. Make an engine with really big cylinders and big flywheel and you will have a torqy sob no mater what fuel you use. |
#5
|
|||
|
|||
why diesel engines are having hight torque comparing with the same size of Petrol Engines ??
On 7 Nov 2006 13:23:04 -0800, "Doug" >
wrote: >Diesel fuel has more btus (watts) per gallon than gasoline. Diesels >engines can be run at higher compression ratios because engines wont >ping with the diesel fuel. I think just about all diesel engines are >fuel injected (but so are gas now). Anyway, both work. Personally I >don't like the noisy, dirty, stinky diesel (prefer gasoline), but they >do work well. Make an engine with really big cylinders and big flywheel >and you will have a torqy sob no mater what fuel you use. Actually diesels ?ping/knock" all the time, that is where noise comes from. while there is about a 12% difference in BTU content the biggest thing limiting gas engine power and efficency is low octane fuel because there are those that think 87 octane is the wonder fuel which it is not and detriot has to do a LOT of trickery with timing curves and CR ratios to control knock from it which reduces power and MPG. In the 60's and early 70's you knew when you were not feeding your engine right because it would knock big time but today they mask it with knock control that quietly steals your power from you. ----------------- TheSnoMan.com |
#6
|
|||
|
|||
why diesel engines are having hight torque comparing with thesame size of Petrol Engines ??
SnoMan proclaimed:
> On 7 Nov 2006 13:23:04 -0800, "Doug" > > wrote: > > >>Diesel fuel has more btus (watts) per gallon than gasoline. Diesels >>engines can be run at higher compression ratios because engines wont >>ping with the diesel fuel. I think just about all diesel engines are >>fuel injected (but so are gas now). Anyway, both work. Personally I >>don't like the noisy, dirty, stinky diesel (prefer gasoline), but they >>do work well. Make an engine with really big cylinders and big flywheel >>and you will have a torqy sob no mater what fuel you use. > > > > Actually diesels ?ping/knock" all the time, that is where noise comes > from. while there is about a 12% difference in BTU content the biggest > thing limiting gas engine power and efficency is low octane fuel > because there are those that think 87 octane is the wonder fuel which > it is not and detriot has to do a LOT of trickery with timing curves > and CR ratios to control knock from it which reduces power and MPG. In > the 60's and early 70's you knew when you were not feeding your engine > right because it would knock big time but today they mask it with > knock control that quietly steals your power from you. High pressure direct cylinder injection appears to be giving a lot of the benefits of diesel in gas engines. |
#7
|
|||
|
|||
why diesel engines are having hight torque comparing with the same size of Petrol Engines ??
"Doug" > wrote in news:1162934584.258573.35140
@m73g2000cwd.googlegroups.com: > Everyone is all hot on torque, but what matters is power. You just have > to shift down to get the power you need. Look at the rock crawlers, > they have gears so low they can go 1 mph at 5000 rpm! Power is what you > need. Torquey motors give good power at low rpms, which is a kick I > guess. > > Diesel fuel has more btus (watts) per gallon than gasoline. Diesels > engines can be run at higher compression ratios because engines wont > ping with the diesel fuel. I think just about all diesel engines are > fuel injected (but so are gas now). Anyway, both work. Personally I > don't like the noisy, dirty, stinky diesel (prefer gasoline), but they > do work well. Make an engine with really big cylinders and big flywheel > and you will have a torqy sob no mater what fuel you use. > Even *if* you have a slushbox with high stall-ratio, you *will* have to put your high-power/low-torque engine through that gutless range from idle to peak-power. Or do you jam your slushbox into Drive after you revved up the engine?....) -- Bye, Willem-Jan Markerink The desire to understand is sometimes far less intelligent than the inability to understand > [note: 'a-one' & 'en-el'!] |
#8
|
|||
|
|||
why diesel engines are having hight torque comparing with the same size of Petrol Engines ??
On Tue, 07 Nov 2006 17:17:23 -0800, Lon >
wrote: >High pressure direct cylinder injection appears to be giving a lot of >the benefits of diesel in gas engines. It holds a lot of promise because it eliminates fuel being lost during scanvanging which improves MPG and also allows for higher CR ratios for a given fuel octane because the injection of fuel into cylinder just before ignition cools the mixture as fuel vaporizes rahter than being lost to intake port walls and such and higher CR ratio ment better power and MPG too. In theory you could run about 13 to 1 CR with a gas motor with direct injection and 94 octane and get a nice power and MPG boost too. I look for DI on gas engines to be main stream by 2010and for diesel to start loosing their luster after that because the MPG difference will be a lot less and the diesel will still cost a lot more to buy and fuel. DI will alos make it easier to supercharge gas motors too. ----------------- TheSnoMan.com |
#9
|
|||
|
|||
why diesel engines are having hight torque comparing with the same size of Petrol Engines ??
Horsepower is torque times speed (and maybe a constant to get the right
units). If your torque is in ft. lbs and you multiply by the rpm of the engine, you get your horsepower. You can look at the torque curves and horsepower curves for engines in car magazines that review the cars. When people talk about an engine that "has a lot of torque" what they mean, usually, is that it has a lot of torque at low rpm. The design of the engine, the bore and stroke and size of the pistons and weight and size of the crank and flywheel all play a part in how much torque and horsepower an engine has. I don't really think that a diesel engine has more torque by being a diesel. It's just that these are usually truck engines and they want it to have good pull at lower rpm, so they make it so it has good torque at low rpm. However, I'm no expert. wrote: > Well , im trying to have your opinons buddies , im doing a small search > bout this subject . so anyhelp . i got a lot of stuff but still > wondering how the torque can have direct effect on the engine . > > waiting al ur replies . > > 10x advance , |
#10
|
|||
|
|||
why diesel engines are having hight torque comparing with the same size of Petrol Engines ??
On 12 Nov 2006 15:16:27 -0800, "Doug" >
wrote: >Horsepower is torque times speed (and maybe a constant to get the right >units). If your torque is in ft. lbs and you multiply by the rpm of the >engine, you get your horsepower. You can look at the torque curves and >horsepower curves for engines in car magazines that review the cars. > >When people talk about an engine that "has a lot of torque" what they >mean, usually, is that it has a lot of torque at low rpm. > >The design of the engine, the bore and stroke and size of the pistons >and weight and size of the crank and flywheel all play a part in how >much torque and horsepower an engine has. I don't really think that a >diesel engine has more torque by being a diesel. It's just that these >are usually truck engines and they want it to have good pull at lower >rpm, so they make it so it has good torque at low rpm. However, I'm no >expert. > The burning properties of diesel fuel developes good low RPM power but it has its limitations and with proper gearing a gas motor can do a fine job. Most gas motors are just getting started when oil burners are running out of breath and if you gear a gas motor a lot differently than a deisel to use its power curve properly it will pull well. Most do not because people have a mental block on what a good axle ratio is for a gas motor and gear them wrong. BTW, 600 ft lbs of torque at 2000 RPM is the same HP as 450 ft lbs at 3000 or 300 ft lbs at 4000 RPM. Als remeber that a diesel needs a lot more size to exceed the torque output of a gas motor either via more displacement or boosting with increases its effective displacement. Take the turbo of a CTD, PS or Dmax and it will be quite gutless. ----------------- TheSnoMan.com |
Thread Tools | |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Thread Starter | Forum | Replies | Last Post |
petrol in diesel | Jo Ling | BMW | 16 | November 4th 06 10:58 PM |
Unleaded petrol mixed with Diesel in a Chrysler 2.5CRD | [email protected] | Technology | 360 | December 15th 05 12:25 AM |
Unleaded petrol mixed with Diesel in a Chrysler 2.5CRD | [email protected] | Chrysler | 360 | December 15th 05 12:25 AM |
Ford's Mod Motors Are "Top-10 Engines"? | [email protected] | Ford Mustang | 14 | March 19th 05 04:53 PM |
Why/How do diesels deliver *less* power but *more* torque? | [email protected] | General | 2 | September 15th 04 11:39 PM |