Let’s talk about the torque in diesel-engines and gas-engines.
Torque measured from a car engine, what does it tell to you ?
If you tried to figure out the difference from the physics books, you know that torque is N*m (not Joule) and is a measurement of how much force that is used for rotation, and that power is J/s.
You can calculate the acceleration of the car by knowing the mass of the car and the power of the engine.
Why should you care about the torque? Is the torque more high in the turbo-diesel engines. Do you feel the difference in the torque from diesel-engines to ordinary gas-engines, are diesel engines more powerful ?
The torque is the twisting force the engine applies to the crankshaft.
In SI ( International System) units, the power of the engine is measured as the torque times the rotational speed.
In US (United States) customary units, the engine output is measured
in horsepower and torque in foot-pounds.
Also in the USA, a common unit used to measure torque is the inch-pound (lb). This is a force of one pound acting at the end of a lever (wrench) only one inch long.
A horsepower equals 550 foot-pounds per second. Two engines with very different torque characteristics can have exactly the same horsepower since one horsepower can be generated by moving one pound 550 feet or moving 550 pounds one foot, as long as it is accomplished in one second.
The high torque engine would be rotating proportionally more slowly than the low torque engine at the same power output, but twisting the crankshaft harder.
Theoretically, this should not make any difference in maximum acceleration since the gearing of the transmission can be designed to match the torque characteristics of any engine.
Practically, however, a high torque engine will have faster response to the accelerator pedal from a lower RPM.
TORQUE CARS SPECIFICATIONS | Examples
Jeep Liberty/Torque Specs & Socket Sizes
Engine
| Socket Size | Torque Spec | |
|---|---|---|
| Battery Terminal Clamps | 10mm | 6 lbs-ft |
| Engine Drain Plug (3.7L) | 13mm | 25 lbs-ft |
| Engine Drain Plug (CRD) | 8mm Allen | 25 lbs-ft |
| Engine Skid | 15mm Deep Socket | 45 lbs-ft |
| Ignition Coil Mounting Nut | 10mm | 6 lbs-ft |
| Spark Plugs | 5/8" Spark Plug Socket | 20 lbs-ft |
| Tensioner Pulley | 15mm | |
| Thermostat Housing Bolts | --mm | 9 lbs-ft |
| Water Pump Bolts | --mm | 40 lbs-ft |
Sterring
| Socket Size | Torque Spec | |
|---|---|---|
| Rack & Pinion Frame Mount | 24mm | 120 lbs-ft |
| Rack & Pinion Intermediate Shaft Bolt | --mm | 36 lbs-ft |
| Power Steering Pressure Line | --mm | 25 lbs-ft |
| Power Steering Return Line | --mm | 25 lbs-ft |
| Tie Rod End Knuckle Nut | 21mm | 80 lbs-ft |
| Tie Rod End Jam Nut | --mm | 55 lbs-ft |
Front Differential/Suspension
| Socket Size | Torque Spec | |
|---|---|---|
| Front Axle Hub Nut | 35mm | 100 lbs-ft |
| Front Ball Joint Nut (Upper) | 21mm | 60 lbs-ft |
| Front Ball Joint Nut (Lower) | 21mm | 60 lbs-ft |
| Front Clevis Bolt (Upper) | 21mm | 100 lbs-ft |
| Front Clevis Bolt (Lower) | 21mm | 100 lbs-ft |
| Front Control Arm (Upper) | 18mm | 80 lbs-ft |
| Front Control Arm (Lower) | 19mm & 24mm | 120 lbs-ft |
| Front Differential Bearing Cap Bolts | --mm | 47-67 lbs-ft |
| Front Differential Drain Hole | 8mm Allen | 15 lbs-ft |
| Front Differential Fill Hole | 3/8" Ratchet | 15 lbs-ft |
| Front Differential Pinion Nut | --mm | 200 lbs-ft |
| Front Differential Ring Gear Bolts | --mm | 95-105 lbs-ft |
| Front Shock/Strut Mounting Nuts | 18mm | 80 lbs-ft |
| Front Sway Bar Bushing Mount | 18mm | 110 lbs-ft |
| Front Sway Bar End Link Bolt (Upper) | 15mm | 100 lbs-ft |
| Front Sway Bar End Link Nut (Upper) | 18mm | 100 lbs-ft |
| Front Sway Bar End Link (Lower) | 18mm | 85 lbs-ft |
Rear Differential/Suspension
| Socket Size | Torque Spec | |
|---|---|---|
| Rear Ball Joint Bracket Bolts | --mm | 100 lbs-ft |
| Rear Ball Joint Nut | --mm | 70 lbs-ft |
| Rear Control Arm (Lower) | --mm | 120 lbs-ft |
| Rear Control Arm/Tri-Link Bolts (Upper) | --mm | 74 lbs-ft |
| Rear Differential Bearing Cap Bolts | --mm | 100 lbs-ft |
| Rear Differential Cover Bolts | 13mm | 30 lbs-ft |
| Rear Differential Pinion Nut | 1-1/8" | 210 lbs-ft |
| Rear Differential Ring Gear Bolts | --mm | 70 lbs-ft |
| Rear Shock Mount Bolt (Lower) | 15mm | 85 lbs-ft |
| Rear Shock Mount Nut (Lower) | 18mm | 85 lbs-ft |
| Rear Shock Mount (Upper) | 15mm | 80 lbs-ft |
| Rear Sway Bar Bolts | 18mm | 73 lbs-ft |
| Rear U-Joint Strap | 8mm | 13 lbs-ft |
Transmission/Transfer Case
| Socket Size | Torque Spec | |
|---|---|---|
| Transfer Case Drain/Fill Plug | 3/8" Allen | 15-25 lbs-ft |
| Manual Transmission Drain/Fill Plug | 17mm Allen | |
| Transfer Case Skid (OEM) | 15mm | 25 lbs-ft |
| Transmission Cover Bolts | 8mm | 8-9 lbs-ft |
| Transmission Skid (OEM) | 15mm | 45 lbs-ft |
Miata Torque Specifications
Suspension
|
13-20/18-26 14-21/20-28 |
||
| Swaybar end link bolts, both ends | 27-40/36-54 | ||
| Upper shock mount plate bolts | 22-27/29-36 | ||
| Upper shock nuts | 23-34/31-46 | ||
| Lower shock bolt | 54-69/73-93 | ||
| Lower control arm bolt, front | 54-69/73-93 | ||
| Spindle (vertical) bolt | 54-69/73-93 | ||
|
69-83/94-112 54-70/73-95 |
Brakes
| Front/rear bracket bolts | 36-51/49-69 | ||
|
58-65/78-88 25-29/34-39 |
||
| Front/rear banjo bolts | 16-22/22-29 | ||
| Rear adjuster plug bolt | 9-12/12-16 |
Engine & Cooling
| Crank pulley bolt (1990 - early 1991) | 80-87/108-118 (plus Loctite 242-blue) |
| Crank pulley bolt (late 1991 - present) | 116-122/157-165 (plus Loctite 242-blue) |
| Cam cover bolts | 43-78 in-lbs |
| Alternator mounting bolt | 27-38/37-52 |
| Alternator tension adjustment bolt | 14-19/19-25 |
| Water pump - 4 bolts to block | 14-19/19-25 |
| Water inlet pipe - 2 bolts to water pump | 14-19/19-25 |
| Radiator - upper bolts | 14-19/19-25 |
| Thermostat cover - 2 bolts | 14-19/19-25 |
| Timing belt tensioner bolt & idler pulley bolt | 28-38/38-52 |
| Timing belt cover bolts | 14-18/19-24 |
| Cylinder head bolts (must be done in stages and in correct order.) | 56-60/76-81 |
Intake/Exhaust
| Airflow meter bolts | 69-95 in-lbs |
| Intake manifold bracket | 27-40/36-54 |
| O2 sensor | by feel, as close to 22-36 ft-lbs as possible |
| Exhaust pipe clamp bolt (to bell housing) | 15-20/21-27 |
| Bell housing bolts | 48-65/65-88 |
| Exhaust header nuts | 28-34/38-46 |
| Cat converter nuts (both ends) | 30-41/40-55 |
Clutch
| Transmission front cover bolts | 14-18/19-24 |
| Flywheel bolts | 71-75/96-102 |
| Pressure plate bolts | 14-19/19-25 |
| Bell housing bolts | 48-65/65-88 |
| Prop shaft nuts | 20-22/27-30 |
| Power plant frame bolts | 77-91/104-123 |
| Starter motor bolts | 28-38/38-51 |
| Starter motor mounting bracket bolts | 28-38/38-51 |
| Slave cylinder fluid tube | 9-16 (113-190 in. lbs.) |
| Slave cylinder mounting bolts | 12-16/16-22 |