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docs: update decoders/Missing_Tooth_(cam)

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Administrator 2020-01-18 11:47:23 +00:00 committed by Josh Stewart
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decoders/Missing_Tooth_(cam).md
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title: Missing Tooth (Cam speed)
description:
published: true
date: 2020-01-17T00:42:59.489Z
date: 2020-01-18T11:47:20.390Z
tags: decoder
---
## Missing tooth (Cam speed)
The missing tooth cam-speed trigger is a Speeduino innovation, that permits function similar to a dual-wheel setup, thereby allowing sequential or wasted spark operation from cam-mounted or distributor wheels. The operation is based on both [Missing Tooth](Missing_Tooth "wikilink") and [Dual Wheel](Dual_Wheel "wikilink"). It is suggested to read those sections first for familiarization as this section will only highlight the fundamental differences to those common decoders.
The missing tooth cam-speed trigger is a Speeduino innovation, that permits function similar to a dual-wheel setup, thereby allowing sequential or wasted spark operation from cam-mounted or distributor wheels. The operation is based on both [Missing Tooth](/decoders/Missing_Tooth "wikilink") and [Dual Wheel](/decoders/Dual_Wheel "wikilink"). It is suggested to read those sections first for familiarization as this section will only highlight the fundamental differences to those common decoders.
This decoder is comprised of a single cam-speed wheel in the same configuration as a crank-mounted missing-tooth wheel. The number of teeth ***must*** be evenly divisible into 720°. As it rotates at half crank speed, the sensor reads half the wheel teeth on each 360° crank revolution, and the remaining teeth on the next crank rotation. A single missing tooth will appear on only one of the two crank rotations, and is then used as a phase indicator, much as the dual-wheel system uses the cam signal.
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![missingtooth_cam_triggerconfig.png](/img/decoders/missingtooth_cam_triggerconfig.png){.align-center width=450}
**Fields:**
- Primary base teeth: This is the number of teeth the wheel would have if there were none missing, e.g. a 36-1 wheel has only 35 actual teeth, but you would enter 36 into this field.
- Missing Teeth: The size of the 'gap' in the number of teeth. These missing teeth must be situated in a single block (ie there's only a single gap in the teeth). One missing tooth is recommended.
- Trigger Angle: This is the angle in **crank degrees** **AFTER** TDC (ATDC) of the first tooth following the gap. This number ranges from -360° to +360°.
- Cam Speed: Ensure this box is checked for this cam-speed system.
- **Primary base teeth**: This is the number of teeth the wheel would have if there were none missing, e.g. a 36-1 wheel has only 35 actual teeth, but you would enter 36 into this field.
- **Missing Teeth:** The size of the 'gap' in the number of teeth. These missing teeth must be situated in a single block (ie there's only a single gap in the teeth). One missing tooth is recommended.
- **Trigger Angle**: This is the angle in **crank degrees** **AFTER** TDC (ATDC) of the first tooth following the gap. This number ranges from -360° to +360°.
- **Cam Speed**: Ensure this box is checked for this cam-speed system.
### Timing Setting