# How does an electronic rev counter work?

## How does an electronic rev counter work?

Both are electronic in operation and work by detecting the impulses in the car’s ignition system which occur when there is a spark at one of the plugs. The number of sparks per second is then converted into the number of engine revolutions per minute or rpm.

What does a rev counter connect to?

A rev counter simply shows the number of revolutions an engine’s crankshaft (that’s the rotating bit which converts the reciprocating motion [in a car’s case, the up and down motion of the con-rods and pistons] to circular motion) is revolving per minute (RPM) – usually divided by 1000; i.e., 2 on a rev counter is …

### What is a normal rev count?

Simply, RPM stands for revolutions per minute (or revs per minute) and this significant gauge tells the driver how fast the engine is spinning. A typical engine rev-range is from an idle of between 500 and 1000rpm, and a maximum speed of about 6000 to 7000rpm.

What should rev counter read when idle?

The idle speed should feel consistent without skipping or slipping. In most of today’s cars, an idle speed of 600 to 1000 RPMs is average. If your car is idling rough, though, it won’t feel smooth. The RPMs will jump up and down, for example, or they’ll fall below 600 RPM (or whatever is typical for your vehicle).

#### What is a normal RPM when accelerating?

This range differs from one car to the next, but in general, having your RPM hover between 1,500 and 2,000 when you’re driving at a consistent speed is a good benchmark. You shouldn’t worry too much if it occasionally goes higher or lower than that.

How do you fix a stuck RPM gauge?

How To Fix The Problem?

1. Check the Fuses: If the fuse is blown, remove it and replace it with a new one.
2. Recalibrate: If the calibration is out of sync, reset the tachometer.
3. Check the Wire Connections: If the wiring is the problem, check the manual for the wiring diagram.

## Can a Smith rev counter be upgraded to electronic ignition?

most early Smiths / Jaeger Rev-counters (including ‘cable driven units) can be upgraded to work with Points OR Electronic ignition whilst retaining the ‘RETRO-LOOK’ ie. once re-fitted only you will know of the upgrade ! The most popular upgrade is from Smiths type RVI v1 / RVI v2 current loop system (points ignition)

What does a rev counter wiring diagram show?

Rev Counter Wiring Diagram – wiring diagram is a simplified tolerable pictorial representation of an electrical circuit. It shows the components of the circuit as simplified shapes, and the capacity and signal connections amongst the devices.

### Are there any problems with the rev counter?

Matthew Kimmins and I have been working with EDIS for some time and Matt discovered that the older rev counters weren’t always happywith modern ignition systems. With later voltage driven tachometers there is usually no problem. The internal electronics is basic but they tend to work.

How does a rev counter work on a transformer?

The original board is removed from its plinth and the existing wires removed. This includes cutting the wires to the transformer and re-terminating them to form a direct link through the meter. This links the ignition circuit to distributor providing 12V to the points should you wish to go back to a points system.