HELP! - Combustion engine vs. Rotary Engine
Momentum Keeps Me Going
Joined: Sep 2002
Posts: 5,036
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From: Colorado
Originally Posted by Minda
i know how the rotary works I just hope someone can help me and give a quick summary on the advantages and disadvantages.
Here's an example of what you'll find:
http://www.monito.com/wankel/advantages.html
Good luck!
Registered User
Joined: Nov 2004
Posts: 111
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From: Fort Lauderdale, FL, USA
Advantages:
- extremely smooth, no reciprocating parts
- can rev easily and happily to speeds that exceed most piston engines
Disadvantages:
- not as efficient as its piston counterparts
- little torque output, must rev high to produce power
- extremely smooth, no reciprocating parts
- can rev easily and happily to speeds that exceed most piston engines
Disadvantages:
- not as efficient as its piston counterparts
- little torque output, must rev high to produce power
WWFSMD?
Joined: Jul 2003
Posts: 597
Likes: 0
From: Massachusetts, USA
Some already mentioned that the rotary is a combustion engine. Other than www.howstuffworks.com, read through rotarygod's posts here. Also, there's some info in these threads/documents:
https://www.rx8club.com/rx-8-multimedia-photo-gallery-6/ny-autoshow-%93structure-working-principles-rotary-engine%94-handout-955-kb-28125/
http://asmic.com/collect/rotary1999/rotary_e.pdf
In summary, compared to piston engines of similar size and weight
The Honda S2000's F20c (4 cylinder 2.0L piston engine) is unusual as it's comparable to the RENESIS in many ways. The S2000 gets 15-20% better fuel economy, but it's slightly heavier and larger and is more expensive to build (getting a piston engine to spin up to 8900 RPM and still be reliable requires finer tolerances) which is partly why the high-power 6MT RX8 can be had for $8k less than the S2000.
Also, due to the smaller number of moving parts, rotary engines are more durable. For example:
https://www.rx8club.com/rx-8-multimedia-photo-gallery-6/ny-autoshow-%93structure-working-principles-rotary-engine%94-handout-955-kb-28125/
http://asmic.com/collect/rotary1999/rotary_e.pdf
In summary, compared to piston engines of similar size and weight
- rotary engines provide higher power output
- rotary engines are smoother and have more linear output
- rotary engines consume more fuel
The Honda S2000's F20c (4 cylinder 2.0L piston engine) is unusual as it's comparable to the RENESIS in many ways. The S2000 gets 15-20% better fuel economy, but it's slightly heavier and larger and is more expensive to build (getting a piston engine to spin up to 8900 RPM and still be reliable requires finer tolerances) which is partly why the high-power 6MT RX8 can be had for $8k less than the S2000.
Also, due to the smaller number of moving parts, rotary engines are more durable. For example:
Originally Posted by Rotarynews
When the Lola T616 Mazda first took to the track, it featured a modified 13B rotary engine and was rated at 300-horsepower. As with all rotary engines, the T616 lacked the displacement of competitors' engines, but more than made up for this short-coming with incredible, high-revving reliability and the engine's small size and low weight. In the 1984 season, the team went almost a full year without an engine failure, a huge accomplishment, when other teams were rebuilding their engines after each race. The Mazda Lola's engines weren't even cracked open.
Registered
Joined: Aug 2004
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Also the rotary engine takes less volume (same power and weight) compared to the Otto engine.
You also have to compare it with a 4 cycle piston gas or Otto engine, since a 2 cycle piston gas engine has probably less moving parts and higher power to weight ratio than the rotary or Wankel engine, but also worse emissions.
You also have to compare it with a 4 cycle piston gas or Otto engine, since a 2 cycle piston gas engine has probably less moving parts and higher power to weight ratio than the rotary or Wankel engine, but also worse emissions.
Administrator
Joined: Jul 2002
Posts: 21,958
Likes: 115
From: portland oregon
Originally Posted by trophymaker
Disadvantages:
- not as efficient as its piston counterparts
- not as efficient as its piston counterparts
depends on the eficiency you are talking about.
mechanically the rotary is more efficient
thermally the piston is more effecient.
Registered User
Joined: Dec 2004
Posts: 759
Likes: 0
From: PNW
Originally Posted by zoom44
depends on the eficiency you are talking about.
mechanically the rotary is more efficient
thermally the piston is more effecient.
mechanically the rotary is more efficient
thermally the piston is more effecient.
I'm glad someone at least pointed out the fact it's a combustion engine. If our cars didn't have a combustion engine, then what's been happening to all that gas I put in? lol
Registered User
Joined: Apr 2008
Posts: 49
Likes: 0
Some already mentioned that the rotary is a combustion engine. Other than howstuffworks.com, read through rotarygod's posts here. Also, there's some info in these threads/documents:
In summary, compared to piston engines of similar size and weight
The Honda S2000's F20c (4 cylinder 2.0L piston engine) is unusual as it's comparable to the RENESIS in many ways. The S2000 gets 15-20% better fuel economy, but it's slightly heavier and larger and is more expensive to build (getting a piston engine to spin up to 8900 RPM and still be reliable requires finer tolerances) which is partly why the high-power 6MT RX8 can be had for $8k less than the S2000.
Also, due to the smaller number of moving parts, rotary engines are more durable. For example:
In summary, compared to piston engines of similar size and weight
- rotary marshall engines provide higher power output
- rotary engines are smoother and have more linear output
- rotary engines consume more fuel
The Honda S2000's F20c (4 cylinder 2.0L piston engine) is unusual as it's comparable to the RENESIS in many ways. The S2000 gets 15-20% better fuel economy, but it's slightly heavier and larger and is more expensive to build (getting a piston engine to spin up to 8900 RPM and still be reliable requires finer tolerances) which is partly why the high-power 6MT RX8 can be had for $8k less than the S2000.
Also, due to the smaller number of moving parts, rotary engines are more durable. For example:
Last edited by zacknolden; Jun 29, 2009 at 09:09 PM.
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