Rusty Stainless Steel?

[DynaMight]

Went to look at a Honda SP1 yesterday which has been sat in a shed for a year, the downpipes were pretty rusty. I assume these are stainless steel but can stainless steel rust through like mild steel or is it likely to be just surface rust? any long term effects?

Thanks
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[craigs23]

Hmmm, sounds like a job for a dab of wet'n'dry.

[dave1rs]

can rust through eventually,but takes along time,the better the steel grade the longer it will last.

should just be surface on an sp1,wet n dry and a bit of polish should bring them back up to standard(or better).

[tatters]

Will be just surface rust, for serouis rust on stainless steel it would have to be exposed to salt water.
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[DynaMight]

I was hoping as much, it didnt feel like nasty rust (if that makes sense) it was very smooth still.
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[mchaggis]

Stainless steel rusts beautifully. You should see the exhausts on my GPZ!
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[SoND]

[Itchy]

I wonder why companies still use steel and not thicker aluminium instead which doesn't rust would maybe save weight (if the tubes were made thicker but not so thick that it weighed more than steel).
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[Jack_Cheese]

Aluminium is soft, expensive to make awkward to weld and just generally not as good as stainless. Duralium would work, though

Jack
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[craigs23]

[MattEMulsion]

Would an aluminium exhaust just not melt into a pile on the floor?
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[Jack_Cheese]

[extreme3d]

[Jack_Cheese]

I'd already highlighted the softness and cost, you must be getting distracted by my avatar again


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[proximity]

I believe the main reason for not using aluminium is it conducts heat too well and the idea is to keep the gasses as hot as possible until they reach the outlet.
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[Jack_Cheese]

Proximity up yonder is correct, hadn't thought of that.
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