I recently put a built motor with ported heads and comp cams in the truck and threw a ported eaton on it while waiting for the whipple. I put a 8lb lower on in preperation for the whipple. I ran into a problem while running the truck. I was seeing about 15-16 pounds of boost, and the blower would get so hot to the touch, it would burn you if you kept your hand on it. I started to hear some metal to metal contact from the blower, and when we took it off, we found the rotors eaten away from where they were making contact with the casing. My theory on this, is that the blower was being spun so much, that it produced enough heat to expand the rotors til they started clipping the casing. Has anyone had any experience with this? I know there are a few built trucks out there with ported eatons running low 11s, has anyone had a blower rotor expand on you? Im worried because the new ported eaton I have on the truck now has a 2.8'' upper pulley on it and sees 18lbs of boost. Ive been staying out of boost while I drive it til I know whats going on so I dont eat up another blower.

 

Who ported it? There used to be talk of case warpage depending on the porting design.

 

Do you have a phenolic spacer installed?
If you do, I have read that if you are running the stock
EGR tube (not the after market longer one) that it pulls
enough on the plenum that it could actually flex the case of
the blower & result in rotor contact. I think Mike Madden of
Madenterprise has expierenced this. He can be contacted
on the NHTOC SV Board.

 

no spacer installed. I do have the stock egr still there, although I have the block off plate waiting to go on. Im thinking maybe I should put a smaller lower pulley on to help protect it.

 

I had an Apten ported Eaton that the rotors and case made so much contact on a run at the track, that the supercharger seized tight.

FYI: I was running a phenolic spacer and the stock EGR tube.

 

 

I remember that - wasn't pretty It was your first run in the L, too

 

Apten port here, 9 months, no problems. No phenolic heat spacer either.

Hey Goat, who ported your blower?

 

It was mike Dunn and his spacer was between the blower and lower intake not the usual phenolic spacer. but yes it seems if you do not torque a ported case down correctly rotor contact seems to happen. i bet if you backed off all the bolts you could spin the rotors by hand and when you tighten them down you'll have a rub! There are other issues such as structural integrity when porting! the boost under the blower can actually "pick up" or bent the rotors causing the top or the rotors to contact the case! i'm running a apten ported eaton 6 months 4lb lower no problems! with an upper phenolic spacer. Oem rebent EGR tube!

 

Case flex not over spinning. Think about how often you run it to redline. You are only "over spinning" as you reach redline. I seriously doubt you spend much time at redline.

 

stegimeyer port. I have a 8lb lower and 2.8" upper on it right now. Im thinking of changing the bottom to a 4lb for the time being. Im at a loss for why the blower is heating up so much and warping the case/rotors.

 

heat is due to the warpage of the rotors not the other way around!!!

 

Not a good idea to run it. You will be sending metal shavings into your engine. Rotors are not the problem. The case is the problem. The heat is cause by the rotors contacting the case. Not the case getting hot and warping. The case is toast. Find a new blower asap.

 

Stiegemeier's will clean up the case/rotors to eliminate the contact, for a very resonable price.

 

But how long does it take at redline to trash rotors? At 15,000 rpms, it would not seem like very long.