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Motorized Bicycle General Discussion All topics regarding bicycles with engines.

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  #1  
Old 10-13-2016, 06:20 AM
Johnincali Johnincali is offline
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Default Dolphin powered bike... a different kind of 2 stroke

Hello all... after watching Harley and the Davidson's I got inspired to build an old time style motorbike. Here's some video of my Dolphin powered bike.... https://www.youtube.com/watch?v=0oG2RSe3P20

The engine was inspired by the Ricardo Dolphin of 1904. These engines were used to power boats and a car... As far as I'm aware this may be the first Dolphin to power a motor bicycle...

Here's a picture.. http://www-g.eng.cam.ac.uk/millenniu...rdo/page07.htm
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Old 10-13-2016, 09:47 AM
curtisfox curtisfox is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

WOW! How KOOOOOL is that, Like it a lot................Curt
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Old 10-13-2016, 05:09 PM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

Has anyone come across a good theory of operation of this engine. I noticed that unlike a regular two stroke engine, a spark plug in each cylinder, this kind specifically has a cylinder without a spark plug to I guess draw in and ready a charge mixture that transfers to an second cylinder with a spark plug. It idles slower than a normal two stroke engine that is for sure.

MT
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Old 10-13-2016, 07:02 PM
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Allen_Wrench Allen_Wrench is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

I like that thing. It's very different to be sure, but really cool. It has a unique sound to it too.
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Old 10-13-2016, 07:33 PM
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Agreen Agreen is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

Is that an air compressor you modified into a dolphin replica?! It looks convincing at first, then I realized it doesn't look 100% (still, quite convincing though) like the drawing.
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Old 10-13-2016, 08:09 PM
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MotorBicycleRacing MotorBicycleRacing is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

Hi John
Where abouts in CA are you located?
Your bike is very cool, if you bring it out to the Sat Oct 22nd Socal Motor Bicycle Racing event it will be a big hit.

If you come on Friday 21st you can cruise it around the track at Grange Motor Circuit in Apple Valley, CA
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Old 10-14-2016, 12:41 AM
MEASURE TWICE MEASURE TWICE is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

So I guess after seeing the post after the first one, I looked for faux. Well guess hose clamps on a rubber hose between cylinders could be OK if it does not get too hot and transfers carb input not exhuast.

Even if it is faux and this is a 4 stroke engine, does the Dolphin 2 Stroke actually idle slow in reality because of the design?

MT
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Old 10-14-2016, 02:08 AM
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Agreen Agreen is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

It's still a 2 stroke, the 2nd cylinder is a charge chamber. It just doesn't utilize crankcase compression. If it were a 4 stroke it would have valves. The only valve this engine has is a check valve above the power cylinder.

And I did a little research on that design. There is apparently only one left in existence, and it's not on his bicycle.
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Old 10-14-2016, 10:54 AM
Slogger Slogger is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

It's a converted air compressor (says so in the video header).
That's quite an achievement, getting it to run at all. You guys are nuts!
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Old 10-14-2016, 04:01 PM
Johnincali Johnincali is offline
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Default Re: Dolphin powered bike... a different kind of 2 stroke

Hello all, Thanks for the comments... if interested you can read about the Dolphin engine here... http://www.oldengine.org/members/die...sc/ricardo.htm

or here.... http://www.oldengine.org/members/die...sc/ricardo.htm

Ricardo designed it in 1904 when he was just 17 years old... it was know for it's smooth running and high torque.. Around 1908 they made a car called a Dolphin that used the engine... it was also popular in boats.. Never hear of one in a motorcycle though...

The engine operates like any other 2 stroke except that it is uniflow and uses a piston to charge / scavenge the cylinder... I like to build different kinds of engines and I couldn't find any video of a running Dolphin so I thought it would be a neat one to make... yes the engine is made from a 2 cylinder single stage air compressor.. both pistons are on the same crank throw.. I replace the power cylinder with one from a Harley... Agreen, there is actually 2 valves...one near the spark plug and another just behind the carburetor. I've also made some modifications / improvements to the original design like moving the location of the carb and also changed the combustion chamber...

All the best, John

Last edited by Johnincali; 10-14-2016 at 04:26 PM.
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