Author Topic: Hypothetically speaking  (Read 443 times)

Offline m_fumich

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Hypothetically speaking
« on: April 09, 2019, 01:41:00 PM »
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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Offline muddy

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Re: Hypothetically speaking
« Reply #1 on: April 09, 2019, 08:28:37 PM »
Connect the engines crank to crank or side by side with gear boxs. Either way timing of the engines is critical.


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Offline m_fumich

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Re: Hypothetically speaking
« Reply #2 on: April 09, 2019, 08:46:08 PM »
Why is timing a factor? The flywheel is ignorant of the position of each piston. I can see how the RPMs need to be synchronized.


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Online slip knot

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Re: Hypothetically speaking
« Reply #3 on: April 09, 2019, 08:56:04 PM »
Harmonics

Offline m_fumich

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Re: Hypothetically speaking
« Reply #4 on: April 09, 2019, 08:59:08 PM »
So if Im using two single cylinder engines, I actually need them timed 180 from each other.


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Offline muddy

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Re: Hypothetically speaking
« Reply #5 on: April 09, 2019, 09:01:21 PM »
So if Im 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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Offline m_fumich

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Re: Hypothetically speaking
« Reply #6 on: April 09, 2019, 09:04:43 PM »
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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Offline bonneyman

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Re: Hypothetically speaking
« Reply #7 on: April 10, 2019, 06:45:57 PM »
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.

Offline Rural53

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Re: Hypothetically speaking
« Reply #8 on: April 11, 2019, 02:51:17 AM »
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


Offline bmwrd0

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Re: Hypothetically speaking
« Reply #9 on: April 11, 2019, 12:58:37 PM »
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

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Offline m_fumich

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Re: Hypothetically speaking
« Reply #10 on: April 13, 2019, 08:31:19 AM »
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 Im talking about linking small engines, not car engines.


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