New Split Cycle Engine Concept: The Doyle Rotary Engine

The DRE is a rotary split cycle engine concept designed to replace current automotive engines. It is smaller and lighter per unit of displacement and has many efficiency gains over conventional engines and other engine concepts.

I made this video using Solidworks, Photoshop, After Effects, Audacity and Handbrake.

I would like to thank Jim Hummel for the voice over work.

We look forward to answering questions and comments. Feel free to post video replies and repost the video wherever you want.

Check out our website: www.doylerotary.com

Category:

Science & Technology

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• doyle
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• split-cycle
• internal
• combustion
• four
• stroke
• motor
• invention
• concept
• prototype
• design
• advantages
• efficient
• pistons
• cylinder
• apex
• side
• corner
• wankel
• seals
• higher
• popular
• mechanics
• animation
• automotive
• Rotary Engine
• Split Cycle Engine
• New Engine
• Invention Engine
• Solidworks Animation
• Engine Concept
• Engine Design

[UOYtaLOL]

Interesting design.. however you still are still relying on a proven failed design. That would be apex seals..

[ADoyle88]

@UOYtaLOL

From wikipedia:

"Early engine designs had a high incidence of sealing loss...however, Mazda Wankel engines have solved these problems." The 2011 Mazda RX8's "sole engine is a 1.3-liter RENESIS two-rotor rotary engine."

Finally, "In 2010 Audi revealed that in their electric car... they would have a small 250 cc Wankel engine... FEV Inc revealed that in their electric version of the Fiat 500 a wankel engine would be used."

Mazda, Audi and FEV seem to trust the seals.

[UOYtaLOL]

@ADoyle88 Quotes from manufactures.. okay.. well mazda as you know has discontinued their only rotary powered car.. What does that say about the trust in the powerplants design. hmmm... more or less a Novelty item? Mazda has always said they've newly improved their wankels. however the fact of the mater is the seals still fail, with either weak springs, corner/side seals gumming up, or just the good old fashioned blow out. Audi & Fev, "would have" & "would be used" != 30,000+mi proven.

[ADoyle88]

@UOYtaLOL

You bring up good points about spring pressure problems and seals gumming up. Notice that in our engine the seals have a much gentler life. They do not have to adapt to changing angles relative to the surface they are sealing against and they do not cover as much surface during one revolution. The simpler path will allow us to run much lower spring pressures (closer to the pressure of piston rings) and allow the seals to last longer.

[ADoyle88]

@UOYtaLOL

Also, we have tinkered with ideas to seal the ports in other ways beside Wankel seals. However, when prototyping, we figure why take on the task of reconfiguring the engine AND inventing sealing technologies? For prototyping purposes it makes sense to pull parts off the shelf to eliminate challenges. You can understand the challenges we are facing without complicating the process.

[DoyleRotary]

@Agouti P4

If you get a chance to check out the web site let me know what you think.

Feel free to post on our Disqus page. I should have some more images and progress coming up soon.

I will agree that this may be too complicated and/or not feasible for us to build in my shop. I am trying to build this with scrap materials and a very low budget. We self fund the DRE which makes progress very slow at times.

We hope to have a running prototype in a couple of months.

Thanks again

Lonny Doyle

[DoyleRotary]

@Agouti P3

This is how we obtain our stroke.

The earliest form of the rotary engine was Gnome engine introduced in 1913.

It also revolved around a fixed crank similar to the DRE.

If we were to hold the outer housing and spin the crank it would then be a reciprocating piston engine.

As far as follow up I would have to assume you have not been to our web site.

I have been logging the progress on our newest prototype with images and my last post was only a week ago.

Cont.

[DoyleRotary]

@Agouti P2

We also claim that the DRE moves in a rotating motion rather than a reciprocating motion.

The outer housing rotates on a fixed axis and always stays the same distance from this axis.

The pistons are attached to the outer housing using connecting rods that are a fixed length.

This means that the pistons at TDC are the same distance from the center of rotation as they are at BDC.

The cyl. block revolves around a fixed axis that is offset from the outer housing axis.

Cont.

[DoyleRotary]

@Agouti P1

First of all thanks for you interest.

I will try to address your two claims of our false boasts.

We do claim to have fewer moving parts and I will explain how we compared this to a conventional engine.

An 8 cyl. DRE has rods and pistons just the same as an 8 cyl. Otto cycle.

We have a rotating housing that would be equivalent to the crank and flywheel.

The only other DRE moving part is the cyl. block.

A conventional V8 valve train has approximately 131 moving parts.

Cont.

[Agouti]

"Fewer moving parts"? "No reciprocating motion"? These 2 boasts are clearly false and destroy a lot of credibility. While interesting, the fact that there has been no follow up or early prototype proves that it's too complicated or otherwise unfeasible, in my mind.

[MRKNIGHT]

How big is your starter? You have to turn a lot of mass to get your engine started.

[DoyleRotary]

@RockFORD8371HAYLEY3B

The DRE prototype we are currently building is 4.2 liters (256 cubic inches).

It should have outputs comparable to a similar sized conventional four strokes found in today's automobiles. A 4.2 liter should produce around 300 ft lbs of torque and around 300 H.P.

We will not know for sure until a DRE is refined and tested. We are still in the early stages of development.

You can check out our progress on our website, we have images of our progress.

[RockFORD8371HAYLEY3B]

What are the torque production in feet\pounds and total internal displacement in cubic inch's? What are your goals as far as driving\working rpm. Thanks

[eddied96]

@UOYtaLOL /watch?v=_6v-HugbwR0 now go do sum research..

[adztermancoool]

looks cool and very efficient in theory but i've yet to see a working model or prototype