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Stiletto
06-24-2013, 06:41 AM
NZ built.
http://cdn.speedhunters.com/wp-content/uploads/2013/01/4ROTARY_5612.jpg

Reynard38
06-24-2013, 06:50 AM
Hubbard Downing here in Atlanta built and raced a number of rotary sports racers. I don't know it they ever used a 6 rotor engine though.
I bet that thing is LOUD.

The Bigfella
06-24-2013, 06:50 AM
NZ built? What? Gluing together two 20B's?

Keith Wilson
06-24-2013, 07:18 AM
I bet that thing is LOUD.Thirsty, too. A very clean job, though. Making the crankshaft (do they call it crankshaft in a rotary?) took a bit of work, I bet. They put it in a very stock-looking RX-4, which is a little like putting the #2 reactor at the Prairie Island power plant on a skateboard.

http://performancedrive.com.au/wp-content/uploads/2012/07/Pulse-Performance-Mazda-RX-4-six-rotor-8-630x472.jpg

http://www.performancegarage.com.au/sites/default/files/blog-content/ppre2.jpg

Paul Pless
06-24-2013, 07:53 AM
I bet that thing is LOUD.

Mazda's 4 rotor powered 787B is one of the loudest and best sounding race cars I've ever heard.

Dan McCosh
06-24-2013, 08:35 AM
Thirsty, too. A very clean job, though. Making the crankshaft (do they call it crankshaft in a rotary?) took a bit of work, I bet. They put it in a very stock-looking RX-4, which is a little like putting the #2 reactor at the Prairie Island power plant on a skateboard.

http://performancedrive.com.au/wp-content/uploads/2012/07/Pulse-Performance-Mazda-RX-4-six-rotor-8-630x472.jpg

http://www.performancegarage.com.au/sites/default/files/blog-content/ppre2.jpgIt's called a rotary because it doesn't have a crankshaft.

Keith Wilson
06-24-2013, 08:50 AM
It's called a rotary because it doesn't have a crankshaft. So what do they call the funny-looking piece of metal that runs through the middle of the engine and turns?

peb
06-24-2013, 08:52 AM
I thought it was called a rotary because the engine itself, that is the combustion chambers, rotated.

Bob Adams
06-24-2013, 08:54 AM
Actually called a Wankel:
http://en.wikipedia.org/wiki/Wankel_engine

http://upload.wikimedia.org/wikipedia/commons/f/fc/Wankel_Cycle_anim_en.gif

Captain Intrepid
06-24-2013, 09:35 AM
I thought it was called a rotary because the engine itself, that is the combustion chambers, rotated.

You're thinking of a piston driven rotary. This is a Wankel rotary that uses a three sided rotor that moves eccentically in an elliptical combustion chamber.

LeeG
06-24-2013, 09:39 AM
. [/COLOR]So what do they call the funny-looking piece of metal that runs through the middle of the engine and turns?

Shaft without cranks?

Old Dryfoot
06-24-2013, 10:41 AM
Crazy! 800+ HP at 9000 rpm and it's street legal.

But what a racket!

http://www.youtube.com/watch?v=Ay9pTLa3mSE

Rklontz
06-24-2013, 12:07 PM
Wankel rotary's are modular by nature and it doesn't take to much to bolt them together.

Dan McCosh
06-24-2013, 12:21 PM
. [/COLOR]So what do they call the funny-looking piece of metal that runs through the middle of the engine and turns?The output shaft. It is a simple shaft with a single gear. Stretching it simply means adding more gears, one for each rotor.

Old Dryfoot
06-24-2013, 12:45 PM
http://www.dynamicengineparts.co.za/foto_cartridge/kb_dep_rotary_engine_007.jpg

They do still use an eccentric shaft, not quite what you would find in a piston engine though.

Stiletto
06-25-2013, 01:45 AM
NZ built? What? Gluing together two 20B's?

A little more than that I think.

As you no doubt know, those who assemble performance engines are known as engine builders even when they have manufactured no parts themseves, hence the use of the term 'built'.

Stiletto
06-25-2013, 01:48 AM
Wankel rotary's are modular by nature and it doesn't take to much to bolt them together.

Geez, I just thought it was interesting as nobody else has done it as far as I know.

The Bigfella
06-25-2013, 02:05 AM
Geez, I just thought it was interesting as nobody else has done it as far as I know.


Yes... it is interesting.

Thanks, btw.

Rklontz
06-25-2013, 08:12 AM
This is the first time I have seen 6 rotors together and used in an auto application. Mazda has been bolting 2 20b's together to make a 4 rotor motor and hanging turbo's off of them for airplane motors since the mid 80's.

The Bigfella
06-25-2013, 09:41 AM
This is the first time I have seen 6 rotors together and used in an auto application. Mazda has been bolting 2 20b's together to make a 4 rotor motor and hanging turbo's off of them for airplane motors since the mid 80's.

The 20B is a 3 rotor engine

Rklontz
06-25-2013, 02:27 PM
You are correct it was the 13B not the 20B

John Meachen
06-25-2013, 03:47 PM
Why do all that work and then condemn the engine to a short life by leaving off an air filter?

Old Dryfoot
06-25-2013, 04:07 PM
While it might be a street legal car, make no mistake its intended for racing, as such the engines expected life span is a short one. Any damage caused by dust is negligible in this case, the engine will likely be swapped out or rebuilt before it's ever an issue.

If you look at a few different racing engines you'll notice that most don't use an air filter.

Paul Pless
06-25-2013, 04:38 PM
The previously mentioned 787B.


https://www.youtube.com/watch?v=sxXtpMngivM

Old Dryfoot
06-25-2013, 05:02 PM
^ After 24hrs of driving that I bet a ride in a nice quiet Prius is a treat. :D:D

Never knew about the Mazda in planes though...


http://www.youtube.com/watch?v=e5JWi5yyj1A

in a Spitfire no less...

John Meachen
06-25-2013, 05:09 PM
While it might be a street legal car, make no mistake its intended for racing, as such the engines expected life span is a short one. Any damage caused by dust is negligible in this case, the engine will likely be swapped out or rebuilt before it's ever an issue.

If you look at a few different racing engines you'll notice that most don't use an air filter.

Wrong,very wrong.Outside top fuel engines that get rebuilt every 1/4 mile almost all racing engines use air fillters.There have even been instances of foreign objects holding throttle butterflies open,synonymous with a jammed throttle.Read a bit more at http://www.racecar-engineering.com/articles/f1/technology-explained-f1-airboxes-filters/

http://www.gurneyflap.com/Resources/JAN244418.jpg


http://yankeeracer.smugmug.com/Adam-Fohlin/2010/Waterford032810/i-xhKqBxS/0/S/Doug%20Coby%203%2C%20Budweiser%20Blastoff%2C%203-28-2010-S.jpg

http://www.hohpe.com/Gregor/Travel/2001/Orlando/nascar_hood.jpg