These words ****The two-rotor 13B-REW and the three-rotor 20B-REW rotary engines adopted air-mixture injectors underwent further evolution of the dual fuel injectors, and achieved radical improvements in fuel atomization*********


From this site: http://www.mazda.com/history/rotary/e3-1.html

The question......what are air-mixture injectors??? There's something Evil about this. humor

 

Im gonna take a stab at it in the dark and suppose theyre talking about the air bleed sockets found on EFI rotaries...note that other EFI vehicles (piston engines) do not have these...theyre supposed to aid in atomization and distribution of fuel.

 

I'd say the air bleed sockets aswell.

 

Wouldn't it make more sense if it said

The two-rotor 13B-REW and the three-rotor 20B-REW rotary engines underwent further evolution of the dual fuel injectors, when they adopted air-mixture injectors and achieved radical improvements in fuel atomization.

Not that that answered your - ?

 

Three out of three answers agree.....so that's it. Thank you. Hmmmm wonder why people who rip off their solenoid valves etc end up blocking these off. Seems they kill a touch of performance when they do that. Not much, but some. Seems its a feature the Mazda folk were proud of. Just rambling.

 

Good point. Many people here seem to take the "rip everything out" approach to modification, without even bothering to check what all this stuff does.

FYI, Mazda have been using air bleeds with injectors since the 1982 12A Turbo, their first EFI rotary. This is from the Mazda technical press release on the 12AT:

"Air and fuel mixing is promoted at lower speeds by an air bleed to the injector nozzle receptacle, at higher rpm by a mixing plate socket, an open-sided plastic tube with twin perforated plates. The plates splash and squeeze injected fuel, aiding mixture atomisation."

This is basically what the later 13B and 20B use.