mirror of https://github.com/speeduino/wiki.js.git
25 lines
1.6 KiB
Markdown
25 lines
1.6 KiB
Markdown
---
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title: Basic Distributor
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description:
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published: true
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date: 2021-01-02T06:54:11.352Z
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tags:
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editor: markdown
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dateCreated: 2021-01-02T06:54:11.352Z
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---
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## Basic Distributor
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The Basic Distributor trigger is a very simplistic decoder that expects input like what a traditional distributor outputs. That is, 1 pulse per cylinder per cycle.
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For this reason the signal lacks any cylinder position signal and so without a missing/added tooth or camshaft signal reference Speeduino cannot calculate crankshaft angle, phase of cycle, or cylinder assignment. **A distributor must be used to route the resulting sparks to the correct cylinders** (With the exception of single cylinder engines).
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The signal can be as simple as the breaker points from an old pre-electronic distributor, to a crankshaft wheel without any abnormal, extra, or missing slots, provided it is conditioned appropriately to 0v-5v. Most who have installed aftermarket tachometers are familiar with the simplicity of the signal with the only variation being the number of pulses in each crankshaft rotation.
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### A note on resolution
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By its nature the resolution of a simple distributor wheel is quite low. The exact resolution depends on the number of cylinders (The more cylinders, the higher the resolution), but even with an 8 cylinder engine there are only 4 pulses per revolution. This can impact timing accuracy if running ignition control from Speeduino and in most cases upgrading to a higher resolution trigger wheel is strongly recommended.
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## Trigger Signal
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![Basic_sistributor case.png](/img/decoders/basic_distributor.jpg){.align-center} |