FD on the left, Cosmo 13b on the right

 

if you had the cosmo turbos in front if you you'd see that the sleeves direct the exhaust as far away from the turbo as it can.

 

Yeah I wonder why they did that, it must make low end torque.



for the record the McMaster-Carr part number for the roll pins that hold the sleeves in is 92383A724

 

I bet Lynn has the answer to that. Ive seen him write on air dynamics before.

 

Its called マツダ AIPI , Mazda air injection port insert, it is designed to flush out trapped gases on the exhaust cycle via air injection , and then dilute anything thats leftover from the cylce, the purpose is to improve low speed charge ignitability, and served 3 purposes, it lowered idle speed in the cosmo with the automatic transmission to make the shift from P to D or R smoother, it made the engine idle smoother, and lowered the tailpipe readings at idle for emissions via dilution.....Maxt

 

So its for all those who want a smooth ride. I think when we bought the rotary we threw that out the window. I like my car rough and loud.

 

How about a SWAG?



The open end is smaller, and matches the exhaust manifold, (Also small) so there is higher flow velocity at lower speeds. So, the small turbine comes on a bit sooner. The Cosmo is a big car and needs more power right off idle. Kind of a poor choice for a rotary (especially a 2 rotor) engine. A nice long stroke V-8 would be nice.



Lynn E. Hanover