Weak part of the m90?

danman

Registered User
I've heard from you guys saying there are some things on the inside of the blower that might break at like 300rwhp or so, and I've heard about needing your blades/rotors coated. What are the weak links of the internals of the blower, and are there upgraded internals for the m90?

How many people have problems with the snout cracking/breaking?

Thanks,
Daniel
 
The only thing the blower cares about is the RPM its driven at. As for upgrades the only thing that may need replaced is the spring coupler in the 89-93 blower. You can get solid couplers. Porting is one of the major improvments that can be done to a M-90. If you have a 89-93 uncoated rotors you can get a rotor pac from a newer GM M-90 and swap them out, or have you'r blower rebuilt with the new coated rotors ($$$)
 
Hey again BKB. Do the 94-95 blowers have coated rotors? And what is the purpose of coated rotors anyway? Does it make them stronger?

Why would you need coated rotors?

Thanks,
Daniel
 
The shaft in the nose can be replaced with a titanium shaft to support more stress and more revs. The housing can deform under high (beyond specification revs) rpm's allowing for contact between the rotor blades and the inside of the case.

Excess heat can cause the rotor blades to swell and contact the sides of the case.

But in general, they are pretty indestructable. It's just that it's hard to get over 300rwhp with the stock blower due to the restrictions in it and the heat it generates at the rpm needed to produce that power.

There is a special going on right now for a rebuilt rotor pack and coating from The High Speed Lab. See this thread:
http://www.sccoa.com/forums/showthread.php?t=70002

The coatings decrease the clearance between the rotor lobes and the walls of the case improving compressor efficiency and, as shown in their tests, increasing power.
 
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