MicroSquirt.com read only forum (Jan.15,2018)

Hi, I'm toying with an idea of 50cc two-stroke racing engine with MicroSquirt injection and ignition...
So, is it possible and what would I need - is there suitable injector for example?
What fuel pump should I use and how much does it draw current (I'm using 12V motorcycle battery as a power source)

VAX
from Estonia

Ok, I did some research here. Seems that Aprilia SR50 pump + injector would be reasonable choice.
There's however lots of questions...
1. My motor has reedvalve, can I mount injector to the crankcase? Logically taken, there's no difference if the injector is before or after reed?
2. how is throttling done with microsquirt? I understand there's butterfly valve at the throttle body, do I have to use a sensor on that or is there servo motor that turns the valve. Also, how does it manage idle rpms?
3. What sensors I have to use?

VAX

vax wrote:1. My motor has reedvalve, can I mount injector to the crankcase? Logically taken, there's no difference if the injector is before or after reed?VAX

After the reed, into the crankcase is your best option.

vax wrote:2. how is throttling done with microsquirt? I understand there's butterfly valve at the throttle body, do I have to use a sensor on that or is there servo motor that turns the valve. Also, how does it manage idle rpms?VAX

Just use a TPS off another bike, this tells the MicroSquirt what the throttle position is at, and idle rpms is controlled by your butterfly stop, or you might have a bypass circuit that bleeds a small amount of air past, depends what you have.

vax wrote:. What sensors I have to use?VAX

You will need a TPS (throttle position sensor) for butterfly position, a CLT (coolant temperature) sensor for warming up and an IAT (inlet air temperature) sensor.

You will need to run alfa -N istead of speed density also. Map sencor will not work due to low vacum. Your charging system might not be enough to keep your battery charged so you might wanna run a total loss system with a deepcycle agm battery.