Top Answer
User Avatar
Wiki User
Answered 2007-07-07 19:47:12

The tachometer is an electrical device that senses the ignition system. It indicates engine RPM (revolutions per minute). Engine rpm and crankshaft rpm are two ways of expressing the same thing. True, the crankshaft does rotate twice for each complete set of cylinder firings but the tachometer counts each rotation.

User Avatar

Your Answer


Still Have Questions?

Related Questions

What is twisting in cars?

crankshaft The crankshaft rotates. A torsion bar twists.

An automotive engine's camshaft rotates at?

An automotive engine's camshaft rotates at A. the same speed as the crankshaft. B. one-quarter the speed of the crankshaft. C. one-half the speed of the crankshaft. D. twice the speed of the crankshaft.

What device assures that the flywheel rotates with the crankshaft?


An automotive engines canshaft rotates at?

The engine's camshaft rotates at half the speed of the crankshaft. The crankshaft turns two full turns for every one full turn of the camshaft.

Does a 1991 integra have a crankshaft speed fluctuation sensor?

There is a crankshaft position sensor that measures how fast it rotates

Does the camshaft rotates at what speed?

One half the speed of the crankshaft.

Rotates the crankshaft as the piston moves down the cyliner?

i am doing a coures in tafe inspect and service engines and i would like to know this rotates the crankshaft as the piston moves down the cylinder

An automotive engine's camshaft rotates?

one half the speed of the crankshaft.

Do the pistons turn the crankshaft or the crankshaft turn the pistons?

Technically both, before the vehicle is running on its own via combustion the crankshaft rotates and moves the pistons, once combustion has occurred the pistons take over if you will and turn the crank which rotates the next piston into position for combustion

What holds the crankshaft in position as it rotates?

The main bearings and main bearing caps.

What is a crank bearing?

It's a bearing that the crankshaft of an internal combustion engine rotates on.

What Main bearing on a light vehicle engine are normally used?

Main bearings are what the crankshaft rotates on.

An automotive engines camshaft rotates at what speed crankshaft?

The ratio is computed by counting the gear teeth on the camshaft and the teeth on the crankshaft. Therefore a cam with 24 teeth against a crankshaft with 48 teeth, there is a 2:1 ratio.

What is automotive crankshaft?

A shaft that connects the pistons through rods and rotates for Compression Exhaust and Intake of the enginge

What is the rotation of a Dodge 360 engine when you are facing it?

As with most engines, the Dodge 360 cid engine's crankshaft rotates clockwise when viewed from the front of the engine. The distributor also rotates clockwise.

Why does the crankshaft turns faster than the camshaft?

The camshaft controls the valves, each pair or set of four controls one cylinder. One cylinder fires at a time, which rotates the crankshaft.

What is the rpm of the earth?

RPM = revolutions per minute 0,000694rpm -> considering that the Earth rotates in 24 hours 0,000696rpm -> considering that the Earth rotates in 23h and 56 minutes (which is the real time in which the Earth makes 1 revolution) therefore in general its .00069

Does the crankshaft nut trun left or right to loosen?

AnswerLeft, counter-clockwise. Lefty loosey, righty tighty. --------------------------------------------------------------------------------It depends on which way the crank rotates. If it rotates clockwise the nut will be threaded on counterclockwise to prevent it from loosening. If the crank rotates counterclockwise then the nut will be threaded on clockwise.

How many times the camshaft rotates?

The cam shaft rotates 2 times for every rotation of the crankshaft. The pulleys are a 2-1 ratio. This means every revolution of your engine...RPM...your camshaft is rotating twice.

Where is the crank shaft located in 1996 ford explorer?

The crankshaft rotates at the bottom of the engine block ( inside / above the oil pan )

What is engine rotation direction on a 1999 Lincoln Town car?

Standing in front of the vehicle looking at the engine, the crankshaft rotates clockwise.

What are 2 ways the earth moves in space?

the earth rotates on its on axis which is how we measure a day and the earth rotates around the sun this is called a year

How does a car heat engine change thermal energy into mechanical?

burning fuel in the cylinder gets hot and expandsthe expansion pushes against the pistonthe piston moves pushing on the piston rodthe piston rod moves pushing on the crankshaft eccentricthe crankshaft eccentric rotates the crankshaftthe rotations of the crankshaft pass through the transmission to the wheels to move the car.

How many revolutions the crankshaft makes in a four stroke engine to complete one thermodynamic cycle?

The crankshaft makes two complete revolutions to complete one thermodynamic cycle. The crankshaft rotates 180 degrees during each stroke of the engine. Hence a total of two revolutions occur after completion of the four strokes. Chechout " " to see how crankshaft works.

What is a rod journal?

Connecting rod journals are the part of the crankshaft where the connecting rods attach to. There is one rod journal for each piston/connecting rod in the engine. These journals have a machined surface so the connecting rod bearings can move smoothly as the crankshaft rotates.