Ops-
I read the thread linked, and I may not know much about anything, but what I read a lot of in there is that everyone is so concerned with the position of the oil cable making things richer or leaner at any given point of cable travel, but what everyone is forgetting is that the throttle cable is also moving and adding or subtracting fuel quantity as the cable moves.
What I'm getting at is the way I see everything working is that you are more or less achieving the same fuel/oil ratio from idle all the way up to WOT because both cables are changing the quantity of what they control. As the flipper moves, fuel increases, the oil also increases maintaining the same mixture throughout?
If you're at 50:1 at idle, you are 50:1 at WOT. Or should be. Unless the pump is designed to offer a logarithmic delivery in proportion to fuel delivery.
I'm probably wrong, but this is how I'm wrapping my head around how cable operated oil injection/cable operated fuel delivery combos work. Both cables move at the same time to increase the quantities of what they deliver.
Either way, I'd rather have the said mixture in question mixed by mechanical means, and further mixing through the carb, as opposed to relying on airflow to mix it properly. Seems to me that by theory the Bender kits would not be mixing all that great at the end of the road.
If you looked at it on a bigger scale, in Yamaha's version where the fuel and the oil are mixed by the pump, and through the carb, the atomized mixture of oil and fuel would be in droplets the size of dimes and would burn uniformly. With Bender's version, you would end up with 2 different dime sized drops floating through the air and would have to hope that in that short of an area that enough of them would smash together enough to mix. Seems like a lot to hope for.
In theory, Yamaha's system stirs it up in the pump, then mixes it together more every time it goes through a jet, or changes direction in a carb circuit. It's probably not possible to mix it much more than it already is by the time the mixture spews out. Bender's just dumps it in at the end of the road.
In my mind's eye, Yamaha's oil/fuel mixture is only one thing, and it's always the same. It burns cleaner, more consistently, and every drop burns the same from idle to WOT.
Bender's you are trying to burn 3 things. Fuel, oil, and a fuel/oil mix. Probably ok when air is sailing right along mixing things into the cylinders at WOT and at 9000RPM, but not at idle when the air isn't moving as fast.
Kinda like James Bond prefers his Martini's shaken not stirred. The booze mixes better when it's shaken.
