Which BMW GDI engines used solenoid direct injectors? Is N73 the only BMW engine with solenoid type?
Looks like N74 uses same piezo as N54 N63 S63?
offtopic interesting read: https://automotivetechinfo.com/wp-content/uploads/2021/01/BMW-Fuel-Injectors-Theory-Operation-Diagnosis-Recalls.pdf
BMW GDI Fuel Injectors
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BMW GDI Fuel Injectors
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ssmith
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Re: BMW GDI Fuel Injectors
N54 uses piezo. N55 (successor), N20 (4 cyl version of N55), and S55 (M3 version of N55, really more like current gen motors) use solenoid. B38/B48/B58/S58 (current gen 3-cyl/4-cyl/6-cyl/"M3") use solenoid too I believe.
I'm not sure about the V8. The manual for the N20 says the N73 uses solenoid, which agrees with what you said.
I would assume, based on this, that first gen BMW DI motors used piezo, but then they moved quickly to solenoid. MINI motors may follow the same trajectory; I think with the release of the B38/B48/B58 motors they are trying much harder to unify their model line behind one set of motors.
I'm not sure about the V8. The manual for the N20 says the N73 uses solenoid, which agrees with what you said.
I would assume, based on this, that first gen BMW DI motors used piezo, but then they moved quickly to solenoid. MINI motors may follow the same trajectory; I think with the release of the B38/B48/B58 motors they are trying much harder to unify their model line behind one set of motors.