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Rattling Supercharger

T

tboy160

New member
My supercharger rattles but only when its under boost, even just a little boost. I have heard everyone say "coupler" when it rattles at idle, havent heard anything about under boost. Also, doesnt seem as if it makes much power while under boost. Two spark plugs have come out smashed in 6 months. I think possibly the Catalytic converter is partially pluggeg and causing all this? Any help or advice would be greatly appreciated.



-2003 GTP, all bone stock, EVERYTHING
-Original motor was blown up, people didnt change oil. They also ran 87 octane.
-Used motor claims 90k, from junkyard, swapped superchargers because coupler was real bad on other one.
 


smashed plugs means something was flying around in the cylinder to do that. they dont just bend on their own. a clogged cat would cause enough restriction to see retarded heat levels and chip a piston.
 
Right...smashed plugs = chipped pistons...gonna need a shortblock. For the coupler, buy one from ZZPerformance, they last forevah. Also, get a 3" Catted Downpipe from them...it gets rid of the stock (possibly clogged one) cat, then it also gets rid of the U-Bend...the most restrictive part of the factory exhaust. That way when you next engine goes in it...you'll be able to let the car breathe and plus you'll be getting better MPG's and performance.
 
Thank you both for your replies.
My problem is, I dont want to spend money/time on a new shortblock if I dont know what killed this one. If it is the Cat, then I would like to know that conclusively. Dont want this present issue to kill future motor.
With the entire car being stock it seems like the options would be limited as to what could cause the pistons to be "chipping"
 
Clogged cat makes sense. Either that your engine knocked from the start and the 3" downpipe will help you with that.
 
knocking doesnt usually chip pistons do tell you the truth, heat does. when the top ring gap closes because the cylinders are too hot then it pops off a piece of the piston, always in the same spot on every motor.
 


Bio248 said:
knocking doesnt usually chip pistons do tell you the truth, heat does. when the top ring gap closes because the cylinders are too hot then it pops off a piece of the piston, always in the same spot on every motor.
Click to expand...

Bio, about the chipping of the piston. Would you expect a sound that ticks only can be heard starting at 1000 RPMS stopping at 1500 RPMS could be the piston or the ring? I let my brother-in-law, listen to it. He works at CAR MAX as a master mechanic. I trust him, just wondering if you have come across that same sound. Does not get loader as RPMS increase, goes OFF at 1500 RPMS and higher. Could that still be a lifter or what do you think?
 
a ticking could be a number of things. its best to narrow it down to one area before trying to decide what it is. lifters usually dont go bad unless theyve got a lot of miles on them, though.
 
So, the supercharger rattling noise is definitely the coupler? Even though it never rattles at idle and ONLY under boost?

If this coupler is rattling under boost would it make sense that it is far less efficient when rattling?
 


Bio248 said:
a ticking could be a number of things. its best to narrow it down to one area before trying to decide what it is. lifters usually dont go bad unless theyve got a lot of miles on them, though.
Click to expand...

Bio thanks for the quick reply. It is at 159,000 miles.
 
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