|Today I flowtested a Schrick intake that belongs to Garrick Louie. Just
like the M50 and M52 intakes that I tested, the unused runners were blocked off, and the
measurements were taken at 28" of water on the 300cfm scale of the flowbench.
A) The runner to runner balance is excellent. B) The outlets of the runners (where they mate to the cylinder head) have been CNC'd to the same dimensions as the M50 intake (55mm x 25mm). The actual runners are slightly larger than these dimensions though. C) The surface texture inside the runners is VERY rough (the factory plastic intakes are worlds better). D) The plenum is about the same size as the M52 intake (ie, smaller than an M50 intake). E) The Schrick intake flows between the M50 and M52, yet its port cross-sectional area is about the same as an M50 intake.
Comparison to M52 intake:
The Schrick has larger runners than the M52 intake, and more flow. I calculate the M52's port velocity to be roughly (and this is a VERY rough calculation, just for comparison's sake) 288 ft/sec, whereas the Schrick's port velocity is less than 273 ft/sec. The lower port velocity of the Schrick would explain the loss of low-mid range torque versus the M52 intake, and the higher port volume and flow would explain the slight horsepower gains with it. If the plenum where larger, maybe it would pick up more power up top.
Comparison to M50 intake:
The Schrick's runners have the same outlet size as the M50's intake, but the M50 intake has about 40cfm more flow per runner. The M50's port velocity would be at about 315 ft/sec, much higher than the Schrick's. So the Schrick has less flow, less port velocity, a smaller plenum, and *slightly* larger runners than an M50 intake. (Gee, I wonder why it's said that the Schrick is worthless on an M50 engine?)
Considering how rough of a surface they have, maybe some polishing of the Schrick's runners would help it, Only experimenting could answer that though.
If anybody has some thoughts or corrections regarding my observations, please, speak up. I'm not a professor in intake manifold theory, just a student :)