Difference between revisions of "Throttle"
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| − | If using a cable actuated throttle, the choice and routing of cable are important considerations. A push-pull cable has negligible stretch/flex over time and will give the greatest consistency [citation needed for | + | If using a cable actuated throttle, the choice and routing of cable are important considerations. A push-pull cable has negligible stretch/flex over time and will give the greatest consistency [citation needed for stretch comparison]. |
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| + | Other popular choices are shifting and brake cables used on bicycles. Brake cables are often thicker than shifter cables[https://www.bikeman.com/bicycle-repair-tech-info/bikeman-tech-info/1641-cables-a-housing]. A steel cable will always have some stretch, and a thicker gage will stretch less. The housings supplied for brake and shifter cables are also different. Bicycle brake cable housing has steel reinforcement wrapped in a spiral along the length of the housing. Shifter cable housing has longitudinal reinforcement that leads to the cable being incompressible, but the minimum bend radius can be compromised.. | ||
Cable fittings are either swage or swageless. Swage fittings are permanently attached by crimping (swaging). Swawgeless fittings can be attached to the cable in a number of ways including set screws or collets. [citation for fittings] Swageless fittings allow for a degree of adjustment as the cable stretches. | Cable fittings are either swage or swageless. Swage fittings are permanently attached by crimping (swaging). Swawgeless fittings can be attached to the cable in a number of ways including set screws or collets. [citation for fittings] Swageless fittings allow for a degree of adjustment as the cable stretches. | ||
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[insert image of swageless v swage fittings] | [insert image of swageless v swage fittings] | ||
| − | Dry lube like graphite or molybdenum disulfide are the best go to for high quality cable sheathing. However, if the cable is in a wet/humid environment or the sheathing is old or slightly damaged, a liberal dose of a high quality oil such as motor oil is desirable[ | + | Dry lube like graphite or molybdenum disulfide are the best go to for high quality cable sheathing. However, if the cable is in a wet/humid environment or the sheathing is old or slightly damaged, a liberal dose of a high quality oil such as motor oil is desirable[citation needed]. Non-synthetic oils like mineral oil can degrade the cable housing [citation needed]. WD-40 may also degrade the housing and will dissolve the lubricant applied to the cable by the manufacturer [citation needed]. |
| − | Further reading here: | + | Further reading here: https://www.sheldonbrown.com/cables.html |
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=Electronic Throttle Control= | =Electronic Throttle Control= | ||
Revision as of 12:17, 18 May 2020
Throttles are a part of the intake system used to modulate engine output.
Contents
Throttle form factors
now that I think about this, I think the rabbit hole details for throttle like cabling and non-butterfly throttles should get a separate page - will do later if y'all dont (-simon)
Butterfly
Most industry throttle applications use butterfly valves https://www.jenvey.co.uk/support/faqs/donec-at-velit-massa/
At wide open throttle, a butterfly valve still has an obstruction to the airflow, as the valve does not not move out of the air stream, but rotates to the slimmest profile. This type of throttle is the only type that (suffers from this problem? exhibits this behavior? idk a good way to phrase this).
Barrel
Slide
Iris
Cabling
If using a cable actuated throttle, the choice and routing of cable are important considerations. A push-pull cable has negligible stretch/flex over time and will give the greatest consistency [citation needed for stretch comparison].
Other popular choices are shifting and brake cables used on bicycles. Brake cables are often thicker than shifter cables[1]. A steel cable will always have some stretch, and a thicker gage will stretch less. The housings supplied for brake and shifter cables are also different. Bicycle brake cable housing has steel reinforcement wrapped in a spiral along the length of the housing. Shifter cable housing has longitudinal reinforcement that leads to the cable being incompressible, but the minimum bend radius can be compromised..
Cable fittings are either swage or swageless. Swage fittings are permanently attached by crimping (swaging). Swawgeless fittings can be attached to the cable in a number of ways including set screws or collets. [citation for fittings] Swageless fittings allow for a degree of adjustment as the cable stretches.
[insert image of swageless v swage fittings]
Dry lube like graphite or molybdenum disulfide are the best go to for high quality cable sheathing. However, if the cable is in a wet/humid environment or the sheathing is old or slightly damaged, a liberal dose of a high quality oil such as motor oil is desirable[citation needed]. Non-synthetic oils like mineral oil can degrade the cable housing [citation needed]. WD-40 may also degrade the housing and will dissolve the lubricant applied to the cable by the manufacturer [citation needed].
Further reading here: https://www.sheldonbrown.com/cables.html
Electronic Throttle Control
- Main page: Electronic Throttle Control
overview and driving rationale how it fits into system not specific design info
