Mazda LA2/LA3 13B convertion
 

Hi, i have some questions,
A pal of mine is planning to convert a LA2/LA3 to a wankel engine.
The Mazda RX-4 was unpopular here in Norway since in those days the right gasoline type was unfeasible to get hold of,
causing the engine to run hot and going belly up. This was not the cause in Sweden.
I dont know if the octane rating,the lubricating properties of the gasoline or too high combustion temperatures caused this.
Perhaps anyone can clarify ?


The engine is a 13B from a RX5,he does have the required rear axle and driveline parts.
The engine is all stock.
It should be possible to convert the engine to EFI using a Megasquirt 3x controller.

Is it possible to use EFI parts from a later engine without modifying the parts or the engine (bolt on) ?
The parts needed is:
Throttle body with idle air control and throttle position sensor.
Intake manifold with Intake air temperature sensor and injectors.
Distributor with CAS sensors ( for optional sequential fuel and spark )
Exhaust manifold.
Coils (negative connection on leading coil used for RPM signal, fuel only )
Water temp sensor
wideband 02
fuel pump and fuel filters
Fuel pump relay
misc fuses related to the MS3x box.
Fuel pressure regulator with pressure gauge.


I know that these engines sometimes runs 2 injectors per rotor,primary and secondary,
i dont know why and it seems to me that some of the factory injectors is a bit big.
They list as
13B 6-Port
2x injector 720
4x injectors 430
13B Turbo Series 4 / 5
550
13B Turbo Series 6
Primary 550
Secondary 850
All the injectors are in CC/minute

According to the 130 hp this engine can give, and a duty cycle of 0.60 the suitable injectors size is 444 cc/min per rotor.
The closest ones is:
Siemens Deka:
partnumbers
FI114357
0280156127
0280155968
Static Flow Rate (GAS): 44.5 lb/hr = 478 cc/min @ 43.5psi
They are also compatible with E85 Ethanol fuel blend.

In Finland, Sweden, and Norway, 95 RON is the standard for regular unleaded gasoline and 98 RON is also available as a more expensive option
E85 is also possible to get, but not many gas stations has that.