"The Eaton Model 90 supercharger was engineered for 3.0L to 5.7L passenger cars and light truck engines."
The M90 shifts appx 1500cc of air per rotation. It has a maximum rpm of 13,650.
Assuming your engine redlines at 5500 rpm, to get max boost throughout the rev-range, you want the charger near max rpm:
As your engine is 4.6, it needs 4.6 litres of air every 2 rotations.
13,500 (for safety)/5,500 = 2.4545
So for every 1 engine rotation, you can make the 'charger run at a max of 2.4545 rotations. (1:2.4545 pulley ratio).
So at 5,500 engine rpm, the engine NEEDS:
(5,500 x 4.6) / 2 = 12,650 litres of air.
At 5,500 engine rpm, at a ratio of 1:2.5454, the charger will spin at 13,500 rpm, and produce:
13,500 x 1.5l (air mover per rotation) = 20,250 l of air
20,250 / 12,650 = 1.6x more air than required.
Air required enters inlet manifold at a little under 1 bar (atmospheric pressure, but lower, because of vacuum created)
So lets call the 'required pressure' 1 bar.
1.6 - 1 = 0.6 bar extra than required.
1 bar = 14.504 psi.
0.6 x 14.504 = 8.7 psi.
So, the short answer to your question is: yes it will be fine on your engine, as long as you don't want to run more than about 8.5 psi of boost.
You may wish to consider the M112, which shifts 1840cc of air per rotation, and although I don't know the max rpm for it, assuming it's the same as the M90, and all the losses etc are constant:
(8.7 / 1500) x 1840 = 10.7 psi of boost max.
If anyone knows different, please inform
