Zuarst sexperts

[psychedelicropcircle]

I have a JL curly that now has more weld on it than zuarst ! It's in for repair at my mates work. He asks me why we don't use stainless for our zuarsts then says the guy in the next workshop makes a living out of producing bigger zuarsts for mapped cars Audi Porsche etc. so the guy that does this has a look at the curly and says when it's put together it's no using filler weld, which he says is a good chance to why they are always splitting ? Also says he'd use 1.5mm to wot he thought was 1.2 on the curly.

Anybody think of reasons why this isn't a good idea?

[dave wheeler]

hey scott
two problems with stainless is it holds more heat and when it splits its much harder to find someone to weld it for you

[psychedelicropcircle]

The guy mentioned it holds more heat but reckoned its good for exit gas, whilst this may be the case in cars I've no idea if it's a big deal in two stroke expansions. Maybe his thinking is the 1.5mm may be more suitable. Can't help,but think there's enough of us unconditional loonatics wasting shed loads of cash on these things to not have examined this subject.

[warts]

316L is a grade of stainless which was originally designed for exhaust manifold on wartime piston engined fighters. It is more expensive than 304 though.
It is supposed to be resistant to fatigue and weld decay.
I have only stick welded heavier sections of 304, but it was nice and easy to do.

Like many stainless steels it has poor thermal conductivity.
Keeping the heat energy in the gas is supposed to be a good idea isn't it?

Perhaps a real welder would comment?

I imagine most (povety stricken) scooterists would not like to pay the extra cost.