02-18-2009, 10:07 PM #1
does touchdown reduce boost pressure
I have purchased supercharger wheels with touchdown marks, some mild and some moderate and have never had any issues running them
but I wonder if the missing material.......larger clearance between blades and front housing makes a difference in how it performs (effeciency, psi, midrange, etc.)
I have never owned two of the same SC impellers at the same time to compare.
Any feedback will help
02-18-2009, 10:14 PM #2
any pics? Some touch down wear is normal on the blade tips.
02-18-2009, 10:47 PM #3
It's worse than I thought
Last edited by cosmic; 07-05-2010 at 09:37 PM.
02-18-2009, 10:54 PM #4
The S3 runs a pretty tight tolerance so it's normal to have marks on the outer edge of the tips.
I'd still like to see pics though.
02-19-2009, 06:56 PM #5
I got some pics........I'm wondering if light water ingestion might have done some of this......got caught in the rough harbor with a rear air intake and crosswind I know I had to be sucking some saltwater in.
The front housing doesn't look bad but the impeller just won the superbowl
02-19-2009, 07:16 PM #6
Looks like you were 1 step away from a destroyed engine.
02-19-2009, 07:19 PM #7
But all the metal from the touchdown should have gone thru the top end and back out the exhaust
Buying a used supercharger assembeled is like rolling dice.......I only put about 4 hours on it since i purchased it......
IS THE FRONT HOUSING STILL USABLE?
ARE CERAMIC BEARINGS A LETDOWN?
SHOULD I EVER RUN THIS AGAIN WITH NEW BEARINGS?
02-19-2009, 07:45 PM #8
02-19-2009, 07:57 PM #9
I have a stage 3 impeller and front housing almost on the way for my customer who has already payed me for the one that's in the picture.......I'm taking a huge loss
I have a 140mm back housing and a new rebuild kit ready for a rude 2 upgrade so I'm going that route for me but your S3 is pristine.
Of course I could put it back together and resell it but I would never do that......I guess I'm out the $500 plus I payed for it
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