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Ironhead Sportster Motorcycle Talk (1957-1985) For all those that wanna talk about Ironhead Sportster Motorcycles

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  #1  
Old 27th April 2009
mc-motorsports mc-motorsports is offline
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Default New Oil Bag Pressure Test

The reason I'm asking is because there was a post of someone's oil bag blowing up? Split at the seams?

Anyway, I just made a new aluminum oil tank for my bike and I was wondering what I should pressure test it to? I was thinking 10psi would be good. Hook it up to the air compressor with 10psi on the gauge and drop it in a bucket of water.

Sound ok? Or more pressure?

MC
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Old 27th April 2009
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Default tanks-pressure tests

You'll see it bubble at 10PSI.

I built a steel tank for my big twin bobber and I took it to 30PSI for the pressure test.
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Old 28th April 2009
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And if you keep the vent line from the oil tank to the back of the cam gear casing clear, there should never be anything more than atmoshpheric pressure in your oil tank, so dont worry too much about it "blowing up" in use.
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Old 30th April 2009
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That's what I was thinking, but I figured there is something I haven't learned yet, or don't know yet when I read the post about the guys oil tank popping open...
It's only 14ga. aluminum, and I ground the welds smooth (removed a lot of integrity), but I would still like to believe the dip stick would shoot out before the welds would fail.
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Old 30th April 2009
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Default pressure test it

hearing your comments, you need to pressure test the tank. I tig welded a tank and was very confident it was oil tight. I also ground the welds down and it looked great.

leaked like a sieve....pressure tested it and re-tig welded it...now it's great
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Old 30th April 2009
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Yeah, I usually get them right first time around, but especially with aluminum, it might look perfect, then after you pressure test it you notice that tiny little pin hole.
Chinese intercoolers are the worst, they leak every time, pretty welds with lots of pin holes, never fails.

Oh, and I kinda made the tank a little on the larger side, looks better on the streached bike. My though is it will hold more oil and hopefully dissapate a little more heat, hide my relays and fuses, and just look a little better than the lunchbox tank that came on the bike.

Any disadvantage other than the price of oil?
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Old 30th April 2009
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living in minnesota, my bikes rarely get hot so cooling is not a problem up here. I made a side mount tank for my big twin rigid bike and it runs too cold. I get a lot of condensation during the cooler months up here....
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