Is my supercharger mechanically ok?

[mookschank]

Hi folks,

I've got an SC14 and was wondering if it is mechanically ok.

When I hand spin the pulley I can sometimes feel slight resistance. Not much at all but feels like the lobes or something else are slightly glancing. Is this normal? Is a good s/c totally free when hand spinning?

Don't really want to start this in case bits of lobe attempt a combustion process.....

Can anyone help out?

[Ben Wilson]

Take a look inside, there is probably something (bit of gasket?) sitting on one of the lobes.

[Tweak]

might be abit of "over casting", could be just gunk. But if it is a solid object chances are it has damaged the lobes. But until you crack er open and take a looksy its hard to tell.

[mookschank]

Hmm have cracked it open before, couldnt see anything.

Is it possible to have bent lobes, ie. one of the shafts is bent?

[Ben Wilson]

Possible, but unlikely.

They are fairly hefty things.

[Hen]

I've had a similar situation before, and tried to make sure the lobes were as clean as possible. But despite the slight "tightness" as some spots the SC ran fine on an engine.

I don't think you need to worry about the SC self destructing and sending a lobe into your intake. As Ben says, they are pretty solidly built, and Ive never heard of one (SC12/14) deciding to call it quits catastrophically.

Hen