What are peoples experiences of these?

I am thinking about making a small airbox for my carb's from some aluminum sheet and welding (well soft soldering I guess) using Durafix rods or similar..

Dan

I've used HTS2000 aluminium brazing rods with some success.
However you need a good controlable heat source (I use oxy-Mapp gas).
You may find that you end up melting one joint when you try to braze another.
I prefer to use tig now

Its quite tricky to control the slag - you have to abrade the molten surface to get the ally filler to wet and the aluminium oxide layer then floats off which can look a bit naff.

I ally soldered a gearchange extension casting I had cut a bit but of the middle ti to shorten and it looked awful.

Extremely strong though I was hillclimbing the car at the time and I was slamming it into gear and it never broke over two seasons.

Cheap mans version of tig I suppose but nowhere near so convenient and tidy

Cheers

for an airbox you should get a good finish it is imperative that you clean the oxidization with a stainless steel brush as this will effect adhesion. also as mentioned a good controlable heat source. I would also recomment that you rivet wherever possible to keep the joint as close together as possible

I used technoweld and it's great. Good and strong too. As said though there is an annoying tendency for your previous brazes to melt whilst doing new joints so I tend to use bent + rivetted ali strips to hold everything together and then fill the holes afterwards....

Thanks Guys, looks like this is not a silly idea, might even be "fun"...

Dan

for something like an airbox (i.e. quite big) you can pop it on the gas hob on a low heat to help keep things hot enough if your torch hasn't got enough juice. I did this when I cut down my sump (which was a damned good heat-sink).

Obviously be careful not to melt the whole thing!

Matt