6 replies to this topic

[bigmotherwhale]

why dont people use 4 fuel injectors for the mini engine? i know there are 2 ports but the charge robbing problem wouldnt be a problem as far as i can see with 4.

could you modify a mems (mpi) loom to take 4 injectors becuse the join between the two injectors is on the loom, im really up for cutting it and making a mock up manifold with 4 to see what would happen, does anybody know for sure? or has anyone tryed this?

i dont see why you couldnt use any mappable ecu with 4 injectors, with 4 injectors you should get better fuel economy and power as the atomisation will be better

i really am wondering if the only reason that rover used two in each port was becuse it was cheaper and less of a squeeze.

any thoughs on this? i really am struggling to work out why so many people who inject the mini use 2 injectors not just rover.

[KLAS]

it can be done, and one guy over here is working on this.

but the charge robbing will be the same as this happens during the time both inlet valves are open. injecting only when only one valve is open will reduce this, you only have to cope with the differend volumetric efficiency of the cylinders.
using 2 injectors per port doesn't help as there will allways be a time no injector will inject, and than it makes no diference if you fire "injector1 - wait - injector2" or "injector1 - wait - injector1"

[redhotmini]

i think part of the reason is having only 2 inlet ports. unless your running a 7 or 8 port crossflow style head then there isnt much benefit to be had running 4 injectors.

[SMP]

Doesn't the canems system achieve almost the same effect as having four injectors but only using 2?

As you say Klas there is always a time when no injector is required to be open - therefore 1 injector per port is enough. However doesn't the canems do something to address charge robbing - such as injecting different amounts / times for each cylinder on one port?

Cheers
Steve

[Dylan8660]

I'm building a manifold to take four injectors run from the standard ecu, hopefully I'll have some news either way in about a month.
I've always thought that the mpi would really suit the 7/8 port option, the only thing to work out and build would be the inlet and where to mount the alternator.

[bigmotherwhale]

have you thought about an alternator on the crankshaft? i thought you might be able to sqeeze it in by the pulley/ damper it would need to be low rpm PM alternator similar to motorbikes have or wind turbines, you could take the coils from a standard mini one and get some high grade neyodimium magnets to mount on the pulley,

[redhotmini]

you could side mount the radiator, and put the alternator lower down as on carb'd engines. or even try and shift the rad to the other side so it sits in front of the clutch housing.