Supercharger info

[Greg Hermann]

>Hi all,
>
>Yes this is efi related, but before I can build the injection system (which by
>the way will be a simple 555 based system I hope) I need to pick everyones
>brains for info on the superchargers of the Toyota 4AGE engines.
>
>Does anyone have a boost Vs rpm curve for this beast ?  or at least a rough
>idea, so I know where to start with my fuel requirement calcs.
>
>This is going on a Fiat 850 sport (903cc engine), since I have no idea how
>many
>hp this combination will produce, how do you work the fuel calculations ?  The
>ones I've seen all require a knowledge of desired hp (well, I know what I
>desire but I can safely say that it will be unachievable).  So where do you
>begin when superchargers get involved ?
>
>rgds
>
>Dan     dzorde at soanar.com.au
>
>
Me too. I'v got an IH Cub tractor (60 CID flathead 4 banger) which has been
crying for a supercharger so that it can even be able to move itself and
turn a belly-mower at 7250 feet MSL. I've been looking for a blower for it
for a while from an economical source (read cheap). More info on this Ota
unit would be welcome.

What you have to watch with positive disp. blowers is that their volumetric
efficiency AND their adiabatic efficiency both drop precipitously if you
slow them down too much. My calcs for the Cub indicate that I will need a
blower unit which only displaces about .2 to .25 liters/rev in order to get
the blower speed up to where it would be reasonably efficient.

Your 850 Fix It Again-a-Tony will probably turn about 3 (or more) times
faster than the Cub, although I doubt that you will want quite the pressure
ratio that I want to go for (2.8:1). Therefore, you could probably use a
unit with 20-30% more disp/rev than I can without trouble.
Keep in touch. My sweetie wants our meadow mowed.
                                        Regards, Greg