440 871 supercharger ?

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Is the housing flexing with the thicker gasket? Im thinking the .015 gasket wont compress as much as the .030 and possibly keep the housing from twisting or binding on some serious tolerances of a Rootes type blower....?
thats what iam thinking,,,not sure how it worked before with the thick gasket i was using....even though their inst says you can just use a sealant instead of a gasket worries me a little
 
Sealant would be a metal on metal "no crush, no foreign stress riser" from an out of spec or thick gasket.
 
update so after getting the recomended 0.15 blower base gasket today, installed it,,,same thing it still hits when torq down.....calling dyer in the morning....iam at a loss
 
was told i need at least 0.08 clearence, 0.09 is better i have 0.04 did the alum grow? he said i need to have the rotors turned to the clearence i need...i ran this blower for over a year.. pic shows cant get 0.06 in there...thoughts?
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the only thing i can think would be if something got in there and warped or bent the rotors a few thousand , did you try measuring in 3 or 4 different spots around the rotation . i know it sounds stupid but its all i can think of off hand .
 
that was me smoothing of spots I thought look rough
It looks like their is a little raised spot on the rotor edge that has also contacted the case.
The darker line in section you touched up. I`d say somehow someway a tiny piece of debri got in there and locked it up. Good luck, I`d love to experience a blower car someday. Dream of mine:)
 
the guy at the blower place said to turn 0.05 off of the rotors, that would be most of the raised strip alum and it would be fine...cant understand how the rotors grew lol
 
Be nice to find someone, machinist, with a surface plate to see if the case warped?
it would be nice...remember it ran a month ago no issues, removed just the blower not the intake....and now all of this.... being 0.04 around all rotors and it turns free not bolted up ...and to nee 0.09 to be correct , a 0.05 difference floors me...how can this be?
 
Are the dowel pins present between the case and bearing plates?
Is the manifold warped?
Lay the blower on the manifold without a base gasket, does the blower rock around, or sit nicely?
 
Are the dowel pins present between the case and bearing plates?
Is the manifold warped?
Lay the blower on the manifold without a base gasket, does the blower rock around, or sit nicely?
yes and its flat no rock around...i was told to do it right a shop could relocate the dowels from 5/16 to 3/8 and get the 0.05 thats needed
 
Before you machine (or sand) anything check the bearings. It seems entirely logical to me you have a bearing that could have some slop in it causing your problem. I would hate to see you open up the case or polish down the rotors just to end up with a boat anchor that has bad bearings.
 
if i did take the od off the rotor, whats the worst that can happen...would it make them out of balance or what?
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that 3/8 wide strip is what they call the od its about .005 thick and was told by the blower guys to have it machined off.. would not hurt it at all.
 
Before you machine (or sand) anything check the bearings. It seems entirely logical to me you have a bearing that could have some slop in it causing your problem. I would hate to see you open up the case or polish down the rotors just to end up with a boat anchor that has bad bearings.
they were looked at and said to be good and tight.
 
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