Eaton m-90 supercharger
12-13-2005, 04:15 PM
#5
4th Gear Member
Join Date: Aug 2004
Location: Philadelphia, PA
Posts: 1,654
RE: Eaton m-90 supercharger
ORIGINAL: jdaniel
The M90 will work. Thats the blower that Saleen used on the 99-04 GT's. The 112's are for the 4V so the runners for the intake would be a little different.
The M90 will work. Thats the blower that Saleen used on the 99-04 GT's. The 112's are for the 4V so the runners for the intake would be a little different.
03-04 S281 SCs(GT engine) had Whipple twin-screw SCs.
12-13-2005, 05:08 PM
#7
2nd Gear Member
Join Date: Dec 2005
Posts: 309
RE: Eaton m-90 supercharger
There has to be akit that has everything you need to add an Eaton type, I'd think. Magnusen makes kits for so many cars. A vortech is one option by an M-90 would add more low end torque even if it might fall a bit short of the voretech on the high end: positive displacement SCs like the Eaton and all screw or modified roots type units (and roots themselves) build boost at lower revs than a centrifugal. An M-112 is probably more than you need. You can mess up a car by putting to much blower on it, then it only bulds boost up at the top, the 90 cubic inch blower is just about right: a rough rule of thumb is to triple the blower cubes to get the appopriate displacement for the engine its on: 3x90 = 270 which is close to the 4.6's 281, an M-112 is what you'd use on a 5.4 (112x3 = 336 which is right close to 5.5 liters). I had one on a Chevy LS6 for several years and it was great.
12-13-2005, 07:19 PM
#8
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Join Date: Aug 2004
Location: Philadelphia, PA
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RE: Eaton m-90 supercharger
ORIGINAL: David_K
thats not true. they had eaton twin screws and it was still called the M90. only the s281E had the whipple
thats not true. they had eaton twin screws and it was still called the M90. only the s281E had the whipple
12-13-2005, 09:43 PM
#9
2nd Gear Member
Join Date: Dec 2005
Posts: 309
RE: Eaton m-90 supercharger
ORIGINAL: Fallstar01
Eaton makes Roots style blowers, not twin screw.
Eaton makes Roots style blowers, not twin screw.
12-13-2005, 09:48 PM
#10
Join Date: Dec 2005
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Posts: 15
RE: Eaton m-90 supercharger
ORIGINAL: Lee Willis
Eaton's M-90 and M-112 are technically twin screw blowers (sometimes called a modified roots type), not the true Roots impeller type. The two types are very similar in casing look, both are positive displacement designs, and both have two counterrotating "screw type thingys" locked into each other inside the case, so many people assume they are the same thing. But they are slightly different in how they function though: Roots draws in from the top and pushes out the bottom, with the impellers trapping and compressing air between them. Eaton's screw type draws from one end and pumps (screws) the air through, most of the compresson coming from trapping it against the case, then ejects out the bottom. Advantage of the screw type is that it is far easier to machine the screws (you can use modified version of screw thread machinery) than the roots impellers (requires a double offset ellipse cam on one cutter, can't be machined with standard CNC in a single set up), and it has somewhat less internal friction and is quite reliable, and of course Magnusen's brilliant vaccum bypass valve so it has virtually no losses when you aren't on the throttle. That said, a true roots blower has better chaheated and saturation characteristics at the top end and is what you do when you REALLY want lots of air flow.
ORIGINAL: Fallstar01
Eaton makes Roots style blowers, not twin screw.
Eaton makes Roots style blowers, not twin screw.