i just read my response and its a lil confusing. what i meant to say is yes they achived the shorter length by using modified 13B center plates instead of using the thicker 20B/26B center plates. the only way this is really a good solution is when building a peri port motor so that the port sizes in the plates does not come into effect. notice the center rotors would be getting fed by 2 x primary intake runners while the outer ones are fed by 1 x primary and 1 x secondary each if the motor was running off the side ports

heres a real 20B motor. notice the thickness of the frontmost center plate? a true 4 rotor engine would have 2 plates of this thickness.



http://www.auto-illusions.com/rx7/images/DSC01018.JPG

heres a 26B with the 2 thick center plates. im not sure why the 26B motors had the extra thick center plates as they were all peri port motors, mabye the center bearings and stationary gears they used were very large



http://www.motorpride.com/ProjectRotary/26b1.jpg

Speed NYC, your right about the irons...but notice that the 4 rotor is Peripheral ported? lol

i did notice, did you read my post?

the peri ports are exactly what allowed them to make this motor so short.......

Oh ok....sorry. They must have had a e-shaft custom made for that application.

In the instance of a true, or bastardized 4 rotor motor installation in an rx-7 platform, in the sense of spitballing, a mid engine application would solve some of the fitment problems of the conventional engine bay, assuming it was to be a non p-port.



The difference from a true 26b or 2 13b's bolted together is irrelelvant at this point.



The budget I currently have will allow the completion of a bastardized 4 rotor in an rx chassis with a great amount of class, quality, and prowess while maintaining respect to all that is rotary...to complete the project with an actual 26b I would need some backing, from a couple different sources.



I haven't ruled that option out at all, we are just not that far down the road yet.

[quote name='R.P.M.' date='Aug 21 2005, 02:05 PM']Oh ok....sorry. They must have had a e-shaft custom made for that application.


[/quote]



yes, jeff bruce makes custom 2, 3, and 4 rotor e shafts and modifies center plates for the building of these engines. you can orger the 3 and 4 rotor shafts in short or long config. guru and kiwi re sell kits made my jeff bruce

and his precision engineering company



hers a quote from hitmans site:





Custom made 3-rotor based on RX4/5 13B components, Custom made Crankshaft, 12A RX7 centreplates with one modified to take a stationary gear, RX-5 end-plates and rotor housings. Custom parts made by Jeff Bruce.

heres a link to the engine specs

http://www.hitman.hm/engine.htm



heres a link to the car buildup. again notice that this 'short 20B' was built over 6 years ago.



http://www.hitman.hm/rx7.htm



jeff bruce's contact info is on that page too, im sure its changed since then, but you can buy the stuff from guru or kiwi now

I had seen those shots and heard the name before but couldn't remember any of the specifics, thanks for the tip!



It will be interesting to track the man down and see if we can put something together.