I've searched the Forum and haven't been able to find this, my friend says he doesn't know of any cars that come from the factory with secondaries can someone please confirm or deny this?

 

2 primaries: 550cc
2 secondaries: 550cc

 

Thank You

 

Those are for T2's

N/A's use 460cc's

 

All Mazda rotaries made since 1986 have used staged injection, with one primary injector and one secondary injector per rotor. AFAIK they're the only production engines to use staged injection.

Staged injection allows one small injector to be used for low-load situations (which gives better fuel control than a large injector), and use both injectors at high load to provide sufficient fuel.

Earlier EFI rotaries used one large injector per rotor.

 

stop taking your friend's advice...he doesnt seem to know too much

 

yah and quit hanging around ricers, they dont even know how many pistons we have (trick question , LOL!! )

 

Thanks guys, I was pretty sure they did because people mention them alot on the forums, But my friend wants to know why rotaries require such large Primary & secondary injectors, when his FJ20 only has primary 330cc injectors and our friends MA70 has primary 440cc injectors, so why does a 13bt need 550cc Primarys aswell as 550cc Secondaries?

 

Injector size doesn't necessarily mean much, since manufacturers normally size them so that peak duty cycle is in the 50-70% range. FJ20's have pretty small injectors, but then they weren't that powerful in stock form either. MA70's have six 440cc/min injectors, so those injectors have capacity for ~350hp and 13BT's have four 550cc/min injectors (two per rotor) which have capacity for ~300hp.