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General Category => General Discussion => Topic started by: John A on March 08, 2021, 06:31:56 PM

Title: Odd engine
Post by: John A on March 08, 2021, 06:31:56 PM

This is a video of an engine I’ve not seen before. https://youtu.be/4Fkh-MmqOmc
Has anyone seen one in operation?

Title: Re: Odd engine
Post by: Dave Swanson on March 08, 2021, 07:10:56 PM

Quote from: John A on March 08, 2021, 06:31:56 PM

This is a video of an engine I’ve not seen before. https://youtu.be/4Fkh-MmqOmc
Has anyone seen one in operation?

My guess would be that is one cylinder in a bank for maritime application.  But just a WAG. 

Title: Re: Odd engine
Post by: lucky phil on March 08, 2021, 07:35:24 PM

Nope, not seen this. Eight stroke engine then? Eight strokes/crank revolution. I'd like to know what the advantages and disadvantages are.

Ciao

Title: Re: Odd engine
Post by: leroy_can on March 08, 2021, 07:45:58 PM

  Something rings a bell about a very expensive Ducati single 20 or so years back but I could be way off

Title: Re: Odd engine
Post by: kballowe on March 08, 2021, 07:56:38 PM

Atkinson engine design.  The Toyota Prius (for one) uses an engine of this design.

Title: Re: Odd engine
Post by: leroy_can on March 08, 2021, 08:12:18 PM

 Here is what I had seen that triggered a memory. 1993 Ducati Supermono
(https://i.ibb.co/ZfWqDFS/duc-001.jpg) (https://ibb.co/ZfWqDFS)

  Not the same thing but you can see how I made the connection

Title: Re: Odd engine
Post by: John A on March 08, 2021, 08:20:13 PM

Quote from: leroy_can on March 08, 2021, 08:12:18 PM

Here is what I had seen that triggered a memory. 1993 Ducati Supermono
(https://i.ibb.co/ZfWqDFS/duc-001.jpg) (https://ibb.co/ZfWqDFS)

  Not the same thing but you can see how I made the connection

10500 RPM , that must’ve sounded incredible. Good find!

Title: Re: Odd engine
Post by: lucky phil on March 08, 2021, 08:29:49 PM

Quote from: John A on March 08, 2021, 08:20:13 PM

10500 RPM , that must’ve sounded incredible. Good find!

The best part is you can easily make one yourself if you feel the need. All you need is a twin engine and a bolt on section for the balance beam and the balance beam itself. Pretty easy and sorts the major primary imbalance.

Ciao

Title: Re: Odd engine
Post by: LowRyter on March 08, 2021, 11:43:04 PM

Atkinson Cycle.  Variable stroke, the power and exhaust strokes are longer than intake and compression due the angle on the jack shaft (or whatchacallit). The cam is run on the mainshaft.

Title: Re: Odd engine
Post by: jcctx on March 09, 2021, 11:12:53 AM

Can't say about the Prius; but the "Atkinson " V6 in my Tacoma is an emulation of the mechanical one (as above) by using variable cam timing. Seems to work as I get 22+ mpg overall and has since new.

Title: Re: Odd engine
Post by: Guzzistaracing on March 13, 2021, 01:43:18 AM

Quote from: leroy_can on March 08, 2021, 08:12:18 PM

Here is what I had seen that triggered a memory. 1993 Ducati Supermono
(https://i.ibb.co/ZfWqDFS/duc-001.jpg) (https://ibb.co/ZfWqDFS)

  Not the same thing but you can see how I made the connection

If I look at the picture is it so that this system was used on the albatross racer from Guzzi also?

Title: Re: Odd engine
Post by: lucky phil on March 13, 2021, 05:11:58 PM

Quote from: Guzzistaracing on March 13, 2021, 01:43:18 AM

If I look at the picture is it so that this system was used on the albatross racer from Guzzi also?

No the Albatross had no imbalance compensation. No Guzzi single did.

Ciao