Garage Gazette
TOOLS AND THE SHOP => PROJECTS, ALL EXCEPT VEHICLES => Topic started by: m_fumich on April 09, 2019, 01:41:00 PM
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If you wanted to link two small engines to a common driveshaft, how would you do it? Here are the options I can think of.
1) couple the back of one engine to the front of the second engine.
2) connect each engine laterally to a common shaft and engage then independently.
3) connect the engines in a similar manner to a crank and cam using a gear and chain configuration or gears only.
Which method would you think would work best or do you think another option would be better?
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Connect the engines crank to crank or side by side with gear boxs. Either way timing of the engines is critical.
https://www.scsgearbox.com/applications/trucktractor-pulling/stockcomponentmodified/(https://uploads.tapatalk-cdn.com/20190410/73965908b8188ea40fc7a303985be00e.jpg)
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Why is timing a factor? The flywheel is ignorant of the position of each piston. I can see how the RPM’s need to be synchronized.
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Harmonics
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So if I’m using two single cylinder engines, I actually need them timed 180° from each other.
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So if I’m using two single cylinder engines, I actually need them timed 180° from each other.
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Common is 45° it makes them kick back on the started alot less likely.
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If I were using vertical shaft engines and oriented them like a boxer engine, they should be 180° from each other.
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I'm thinking I'd have one of the motors connected with a belt drive so any asynchronous vibrations would be absorbed by the belt, not either engine. A broken belt is easy to replace.
Or maybe I'm just overthinking it.
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Or you could go full Brit grade bonkers and join two Jag 24 valve straight 6 engines together end to end!!
https://www.rodsnsods.co.uk/forum/garage/medusa-206057 (https://www.rodsnsods.co.uk/forum/garage/medusa-206057)
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Or you could go full Brit grade bonkers and join two Jag 24 valve straight 6 engines together end to end!!
https://www.rodsnsods.co.uk/forum/garage/medusa-206057 (https://www.rodsnsods.co.uk/forum/garage/medusa-206057)
As is proper.
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I'm thinking I'd have one of the motors connected with a belt drive so any asynchronous vibrations would be absorbed by the belt, not either engine. A broken belt is easy to replace.
Or maybe I'm just overthinking it.
This was more along the line of what I was considering but not for vibration control but to keep each engine isolated from the driveline by using a sprag. If I use a central driveline and connect each engine to it using a chain and sprockets with a sprag on one of the sprockets. Keep in mind I’m talking about linking small engines, not car engines.
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