Hi, what do you thing i am not sure if the pipe size is ok?
Pipe size: 2"od and 1.880"id.
Also pic, the design like "OK"?

 

manifold pic

 

Collecteur d'admission ou d'echappement?

Orifice d'admission et cheval-vapeur?

Generalement la taille de la pipe 20B est identique que le 13B avec les memes cheval-vapeur par rotor.

 

bon scott!

 

c'est bon!

 

Bon Marché!

 

I thank you all for your support. I don't feel quite as ignorant now.

Isn't that Australian?
http://www.homesong.info/bon.html

 

eiffel tower?

 

3 rotor pipe

 

pipe 2

 

Should be ok... Hope its ported.
Looong RUnners. May have a smidge induced lag.
Also they are all not of the same length.. may create some interesting pulses.. then again they may be all proportioned in a manner that with the length looking to increase by the size of the shortest pipe each time it gets longer.. you may have lucked into sizing them properly.
I would have tried to make them all equal length to prevent reversion in the exhaust pipes that are in between power pulses.



AND... for you Evil

I am listening to my boy right now as I type... (2:24AM at work LOL)

 

You know, i thing it's not possible to make manifold for 20B with the same lenght.
I try to make the best for the FD, but i know it's not perfect.
But my first question is you "know the right ID diameter"?

 

I would think that your 2" OD pipe would be appropriate, with the 1.8 ID.

The only time I feel you may need to do somethnig more extreme would be in cases where you were going for more extreme numbers in performance. The levels I dont believe 99 percent of the forum would be delving into.
For most all applications the ID of those pipes will keep the exhaust velocity at a proper level for nearly all applications, as far as I would figure.
As I said.. I feel they are a tad long.. but then again you may have space issues causing them to be that long.
I think that the shorter, and closer to equal length you can get the better.
Remember that the rotary has a portion of the combustion sysle still happening when the gasses exit the housing. You can either harness that expanding gas in the turbine of the turbo, or you can let it dissipate energy in the exhaust runners as heat.
Now.. as I said earlier.. you may have space limitations that require that design.. OR there may be things I didnt think of... (I am SURE there are plenty LOL) But I am sure it will work just fine either way. May or may not be the most efficient.. but that is for you to decide how much you want from the engine in the end.