Contour the inside edges of that port job a little. Those sharp, abrupt edges can really break airflow. Some guys weld up, (or fill in with epoxy) the two secondary ports on the side for a little more performance, but it really makes the blower loud! The GEN III M90 that was on my old ALLEN kit was "S" ported by Magnuson Products and performed really well.
The engine was a PI swapped '96 4.6L SOHC and at about 9.5psi it put down 343rwph/389rwtq through a 4R70W and an independant rear suspension. The numbers weren't really high, but it had a big fat torque curve. It propelled my near 4,200lb (with driver) Mercury Cougar into mid/high-12's in the 110mph range on a regular basis.
Not mine, but this is someone's version of what an S-ported M90 looks like. Subtle changes, make a big difference in efficiency.
If you really wanted to step things up and start spinning one of these things, you could look into an MPx blower case. Those MPx blowers will spin to the moon....but then you've have moved out of the "free" zone.
The engine was a PI swapped '96 4.6L SOHC and at about 9.5psi it put down 343rwph/389rwtq through a 4R70W and an independant rear suspension. The numbers weren't really high, but it had a big fat torque curve. It propelled my near 4,200lb (with driver) Mercury Cougar into mid/high-12's in the 110mph range on a regular basis.
Not mine, but this is someone's version of what an S-ported M90 looks like. Subtle changes, make a big difference in efficiency.
If you really wanted to step things up and start spinning one of these things, you could look into an MPx blower case. Those MPx blowers will spin to the moon....but then you've have moved out of the "free" zone.
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