Hi all,

two questions concerning the "new" side-exhaust:

a) I read somewhere that the Renesis side-exhaust is
ceramic coated to avoid warping of the sidehousings(?).
Anyone yet considered to convert a 13B to side-exhaust? It
is done constantly for a peripheral intake - is there a
reasonable way to convert to side-exhaust? Maybe with a
machined aluminium-piece - ceramic coated and then welded
into the side and centerhousing?

b) What would be involved to make a complete new
centerhousing for a Renesis, that would be wide enough to
house 2 fullsize exhausts like the sidehousing? This way
the way would be open for 3-,4-,5-,6- rotor engines!! In a
centerhousing, are there any embeeded steel or alloyparts?
Or is it basically just an aluminium or alu-alloy part?

Thanks for your time!

Back lurking and dreaming!

Thomas J.

PS: "new", because it is not really new:

The actual designer of the Wankel - rotary was not Wankel
but NSU Dipl.-Ing. H.-D. Paschke.
Mr. Wankel was actually pretty angry at this design - he
said, that now they made a workhorse out of his racehorse!
Mr. Paschke´s design had originally already a
side-exhaust!
See:
http://www.der-wankelmotor.de/Techniklexikon/techniklexikon.html
 ...scroll all the way down!

It seems however on this design they used a sealing plate
instead of the today common seals, and this plate did not
fare well with the hot exhaust. So they moved to
peripheral exhaust - however they also eliminated the
sealplate (!) ...but never tried the side-exhaust again!!

The current center housing is cast iron. To make it wider would
require a longer e-shaft of course. Doable but I think I would also want
a center main bearing. Perhaps a two piece center housing to easily
accommodate a center main bearing. Here is an old patent on such and engine.

To convert a 13B to side exhaust would be very, very difficult.
You might as well start with an RX8 motor. What I would like to 
try is a side exhaust with a peripheral intake port.

BTW Robin and I are still shopping for an RX8 here in So Cal. We have found
a dealer in Santa Monica that will give us $500 off list with no options,
mandatory or otherwise. Basically $500 is the destination charge.

The point, is I drove the manual transmission version today and I was mightily
impressed with its ability to pull from 1000 RPM. It does not pull strongly but
it does pull ten times smoother than my RX7. Much.. much smoother with no stumble.
I could start off in 2nd gear no problem and pull away in any gear
starting at only 1000 RPM. Street driving for us is a major consideration
and this ability of the RX8 engine to pull from 1000 to 8500 is remarkable.

This is, I think, the main benefit of the side exhaust with no valve overlap. 
A current 13B idling at 1500 to 2000 RPM with a prop load stumbles and 
farts on a regularly basis.

People are going to be mightily impressed how smooth an RX8 engine will
idle with a prop load.

Paul Lamar
 
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