Originally Posted by
John_M_
The other thing I would like to achieve, is to relocate the hi/lo needles to the side of the carb body to intersect the main and idle/ intermediate fuel passages to fine/trim the fuel delivery from the solenoid as needed (if needed?). After ruining one carb body, I know where those passages are, so relocating the needles is not as difficult as milling the solenoid chamber and relocating the fuel feed passages.
It is imperative to have at least SOME form of "calibrated orifice", adjustable or not, because the solenoid itself has a full flow capacity sufficient to feed (estimated) a 30 hp engine.
Which means that in ordr to modulate the fuel for, say, a 3 hp engine, the solenoid has to operate in the lower 10% of its dutycycle. In itself not too bad but it would require custom calibrated electronics or it would go at the cost of resolution in the curves.
Originally Posted by
John_M_
Fitting an original m-carb to the engine would be the way to go, but for me, the m-carb is too big to fit in the location inside the cowl without having to move the engine forward, and that's not something I really want to do. So for now, I'm going to just persist and try to finish modifying the walbro.
I'd expect the original M-tronic carbs to have a fuel orifice tailored to the engine range it is intended for.
I was not aware that the M-tronic carb is that much larger than the equivalent Walbro. But I would think that building a suitable header between engine block and carb would allow for relocation to any more suitable location?