Tech Spam thread - because 1/4" BSP gets 5 hand spans to the jiggawatt

[SOHC 9,843]

9 hours ago, RUNAMUCK said:

Is that because Mitsubishi rings/valve seats couldnt seal well.enough to hold the valve up?

Yes the air goes right past the rings into the sump and then back up past the rings on the next cylinder and out the exhaust 

[RUNAMUCK 27,333]

Linger, but when I helped @dirty_leppa do the valve seals on his/ @Brock-Lee old 910 wagon, when hooked the air line up to the plug fitting on number 4, and green wees starting coming out the radiator overflow.  (Nothing a dose of chemiweld didnt fix)

[kws 3,956]

These disposable welding gas bottles, are they any good? Do they last any sort of reasonable time? I have a couple of small patches of rust I need to weld, and have no gas/regulator at the moment and thinking of changing from flux cored to solid wire for this job just to have better/cleaner welds.

https://www.machineryhouse.co.nz/O0185

I know the bunnings side D bottles are good value, but $129 + $240 (plus regulator) is a bit much for me since I use the welder once every couple of blue moons.

[tortron 58,188]

They might last one panel, I have used them, but imo get the D bottle and have it for every small job for the next 2 years

I think I used one to do a set of 4 cyl headers

[kyteler 58,003]

20 hours ago, kws said:

These disposable welding gas bottles, are they any good? Do they last any sort of reasonable time? I have a couple of small patches of rust I need to weld, and have no gas/regulator at the moment and thinking of changing from flux cored to solid wire for this job just to have better/cleaner welds.

https://www.machineryhouse.co.nz/O0185

I know the bunnings side D bottles are good value, but $129 + $240 (plus regulator) is a bit much for me since I use the welder once every couple of blue moons.

They're terrible.  I used them for a while but they just don't last worth a shit,, far more cost effective to go a proper bottle. If you really want to try it I can send you a regulator for them. 

[SOHC 9,843]

I welded on one exhaust flange and it was 80% empty when o had to get one in an emergency.

[kws 3,956]

So in other words, not worth the money. I suspected as much. Thanks guys.

[Bling 20,232]

Yeah it's bad value for sure. One of those 2.2L cylinders probably costs the same as a full size cylinder refill. Costs a bit more up front, but having a cylinder tucked away means you can weld as much as you want. Could pick up a cheap reg off trademe and a cylinder off there too for not silly money. Test every 5 years ~$100 (with co2 fill) and no other costs other than refills. If you really have super limited need, just give someone a Rutherford to bring their welder over and get it sorted. Rental options when I first started were super limited, so I purchased a cylinder. The bunnings deals seem all good now. $250 gets you a 5KG co2 cylinder delivered (trademe) plus ~$70 for reg delivered (trademe). Bit more than the above combo of 2.2L cylinder + a reg. But you'd get 50 times the repairs done i'd say.

 

[Transom 5,174]

Yup I fizzed thru a couple of those disposable co2 bottles very very quickly then just got a rental 

Surely you can rent a full bottle local and just return it after a month or 2 ? 

16$ a month and about 60$ for a fill is what I’m paying