rki2007 0 Report post Posted October 23, 2009 Hi automobile lovers we all would have come across many technical terms in the cars/bikes discussion threads, offcourse many of them know about all that and have technical knowledge about that. But for people like me, there exists no idea about all these following terms. Can any one explain. 1) What is Torque (Nm/Kgm) 2) What is RPM - Even though i have seen it in my bike, i am not aware of the technicality involved in it. 3) What is BHP- Roughly i have an idea about it as horse power. 4) What is Turbo Lag. Even other technical terms and issues are also welcome. Please share in your knowlegde. Quote Share this post Link to post Share on other sites
singhji1977 0 Report post Posted October 23, 2009 Quote Share this post Link to post Share on other sites
singhji1977 0 Report post Posted October 23, 2009 torque = radious of wheel x force along the cicumference of wheel. The SI Units are Newton Meter(Nm) Quote Share this post Link to post Share on other sites
singhji1977 0 Report post Posted October 23, 2009 RPM is rotation per minute of engine shaft when car is neutral. But when gear is engaged the RPM means the rotation of wheel per minute. Quote Share this post Link to post Share on other sites
singhji1977 0 Report post Posted October 23, 2009 Turbo lag is the lag time between the pressing of throttle(accelerator peddal ) and the response of the vehicle. This is generally applicable on diesel engines. Quote Share this post Link to post Share on other sites
singhji1977 0 Report post Posted October 23, 2009 BHP is -Break Horse Power. Quote Share this post Link to post Share on other sites
creativebala 178 Report post Posted October 23, 2009 @singhji, make use of EDIT option while posting in short intervals Turbo lag is the lag time between the pressing of throttle(accelerator peddal ) and the response of the vehicle. This is generally applicable on diesel engines. Small correction here, Normally in Turbo Diesels, Tubro kicks in around say 2000rpm. After this there will be a sudden surge of power. The lag in power between 0rpm and 2000rpm(i.e., till Turbo kicks in) is called Turbo Lag Diesels are Torquey and Petrols are Revv happy Torque is a main character of Diesel, which helps in pulling the car seamlessly(initially). In Diesel engines, max Torques will fall at mid max rpms. i.e., say an engines has max rpm is 6000rpm, and its max torque hits at 3500rpm, This means, there is no point of accelerating your engine more than 3500rpm, as there will be no use. Only Fuel loss and no power gain if done. For this only, a Tachometer is used (to know engine's rpm). When you buy a car, see its torque, eg 89PS@3500rpm. So with the help of Tacho, make sure you engine doesn't cross 3500rpm speed. creativebala2009-10-23 20:07:52 Quote Share this post Link to post Share on other sites
rki2007 0 Report post Posted October 23, 2009 beautiful singhji1977- i am really impressed. Are you an automobile/mechanical engineer I didn't understand the diagram. Can you explain please!!!! rki20072009-10-23 20:04:06 Quote Share this post Link to post Share on other sites
creativebala 178 Report post Posted October 23, 2009 Common Acronyms HVAC heating ventilation and air conditioning systemNVH Noise, vibration, and harshness ICE, In car entertainment ABS, Anti lock braking ECU electronic control unit OEM original equipment manufacture SRS Supplemental Restraint System (air bag)OBD onboard diagnosticsEBD, Electronic brakeforce distribution traction control system (TCS), also known as Anti-Slip Regulation (ASR) PSI pounds per square inch VTEC (Variable Valve Timing and Lift Electronic Control) also VVT,VTVT CRDI - Common Rail Direct Injection VGT/FGT- Variable/Fixed Geometry Turbocharger creativebala2009-10-23 20:26:53 Quote Share this post Link to post Share on other sites
asethi919 0 Report post Posted October 23, 2009 I understand the torque part but if an example can be given considerig a certain car, that would be great. So if a car hits its maximum torque at lets say, 4000 rpm or something. Does that mean that in every gear, reving it after 4000 rpm is useless or does this apply only to the 5th or the top gear? Quote Share this post Link to post Share on other sites
creativebala 178 Report post Posted October 23, 2009 reving it after 4000 rpm is useless at any gear this applies, it can be useful if you want to hear MORE ENGINE NOISE only Quote Share this post Link to post Share on other sites
CYRUS43 0 Report post Posted October 23, 2009 I Disagree. There are shift points in every Engine-Gearbox package for the perfect shift for Maximum power. Quote Share this post Link to post Share on other sites
singhji1977 0 Report post Posted October 24, 2009 To produce same torque at the nut- A has to apply 20 pounds and B has to apply 10 pounds of force. The practical implication is that if we change the wheel size of the car then it effects on every thing. 1) RPM of larger wheels are less as compared to smaller wheels if the engine is same. 2) the torque effect is more in smaller wheels as compared to larger wheels if the engine is same. 3) average of the vehicle is affected as we change the tyre sizes other than company recommended. Quote Share this post Link to post Share on other sites
singhji1977 0 Report post Posted October 24, 2009 beautiful singhji1977- i am really impressed. Are you an automobile/mechanical engineer I didn't understand the diagram. Can you explain please!!!! Thanks for the compliments rki2007. I am not a automobile but a FIRE ENGINEER. Quote Share this post Link to post Share on other sites
Endless 1 Report post Posted October 25, 2009 very well explained Quote Share this post Link to post Share on other sites
Endless 1 Report post Posted October 25, 2009 Post deleted. CYRUS432009-12-06 06:26:02 Quote Share this post Link to post Share on other sites
amanchopra 0 Report post Posted November 1, 2009 Relation: engine rpm nd torque If the torque value is more at lower rpm, than frequent gear changes r not required. more torque at less rpm means the car engine is peppy nd will give initial thrust to the engine. this will indeed help in city/ traffic driving. Some more technical terms: Overdrive gear: A gear that drives the vehicle faster than the engine. Notchback: Booted version of the hatchback. DOHC engine: Having a double overhead cam shaft. i10 & Ritz both have DOHC engines. Quote Share this post Link to post Share on other sites
soundar.d.gr8 0 Report post Posted November 2, 2009 RPM is rotation per minute of engine shaft when car is neutral. But when gear is engaged the RPM means the rotation of wheel per minute. I seriously doubt it. As fas as I know, RPM is rotation per minute of engine shaft, even if it is not in neutral. Quote Share this post Link to post Share on other sites
creativebala 178 Report post Posted November 2, 2009 Overdrive gear: A gear that drives the vehicle faster than the engine.Notchback: Booted version of the hatchback. An overdrive will give you an additional gear above the normal high gear in a transmission. Its most common application is to reduce engine RPM on the highway, allowing less wear and tear, noise and improved fuel mileage. In a notchback, the roof is abruptly dropped down to the leading part of the boot, also called Fast Back My Request: Please google and confirm your posting and make sure it is informative and does not mislead.(not be taken in a wrong way) Quote Share this post Link to post Share on other sites
rki2007 0 Report post Posted November 29, 2009 What do you mean by:- A-Pillar Softer Suspension Body rolling revv the engine Quote Share this post Link to post Share on other sites
dcarlover 0 Report post Posted November 29, 2009 check this diagram of cars pillars Quote Share this post Link to post Share on other sites
rki2007 0 Report post Posted November 29, 2009 Then you mean to say that the hatch backs don't have an D pillar Quote Share this post Link to post Share on other sites
FuelRunGod 200 Report post Posted November 29, 2009 No its only A, B and C pillars. FRG Quote Share this post Link to post Share on other sites
cartoos 0 Report post Posted November 29, 2009 Another explaination for RPM Revolutions per minute (abbreviated rpm, RPM, r/min, or r!?min−1) is a unit of frequency of rotation: the number of full rotations completed in one minute around a fixed axis. It is used as a measure of rotational speed of a mechanical component. Standards organizations generally recommend the symbol r/min, which is more consistent with the general use of unit symbols. This is not enforced as an international standard. In French for example, tr/mn (tours par minute) is commonly used, and the German unit reads U/min (Umdrehungen pro Minute) or 1/min (= 1 min-1). The corresponding unit in the International System of Units (SI) is hertz (symbol Hz) or s-1 (1/second). Revolutions per minute is converted to hertz through division by 60. Conversion from hertz to RPM is by multiplication with 60. 1 rpm = 1/min = 1/(60s) = 1/60 Hertz = 16.667 mHz Another related unit is the SI unit for angular velocity, radian per second (rad!?s−1): 1 RPM = 2|D rad!?min−1 = 2|D/60 rad!?s−1 !O 0.10471976 rad!?s−1 cartoos2009-11-29 15:53:36 Quote Share this post Link to post Share on other sites
Alok Mathur 0 Report post Posted December 7, 2009 What is 'Power Band'? Quote Share this post Link to post Share on other sites