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Thread: Otto Benz blow lamp
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4th August 2020, 11:45 AM #1
Otto Benz blow lamp
Not sure were to ask this question, but I have a Otto Benz blowlamp (old)
and have been trying to find what fuel to use. I've tried kero but it doesn't get up
to a proper flame. A lot of info on the net says petrol (gasoline as they say over there)
Now I'm a bit of a coward so want to know if anyone has any knowledge of
these lamps.
I remember as a wee fella (many moons ago) Mum had an iron heated by petrol
so they must have used petrol in some things, and these lamps seem reasonably
common in the USA.
The company of old Otto became Benzomatic.
Would put up a photo if I knew how to get it off the phone.
Any info would be appreciated,
Cheers
Robbo37
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4th August 2020 11:45 AM # ADSGoogle Adsense Advertisement
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4th August 2020, 01:50 PM #2
Paraffin would more than likely be the fuel it was originally designed for; is there a little pressurising pump on one side of the fuel holder? It may also need first priming with metho, if there is a shallow depression in the top of the fuel tank directly underneath the back of the burner you put a bit of metho in that.
From memory you first pressurise the fuel tank with the pump and the regulating valve closed. Pour on your bit of metho and light it. Once lit gently open the fuel valve until you hear the paraffin come through and hopefully light up. Once lit you gently open the fuel valve wider until you get the flame you want.
The whole thing might take a couple of minutes to get going properly; and if you have any leaks in the pump or filler cap it won’t build up pressure inside and simply won’t work very well at all. The jet also might need cleaning with a wire pricker.
If there’s no place to put metho it might well be designed for petrol, but I would still first try using paraffin. Or Colemans camping stove fuel as it burns cleaner than petrol.Nothing succeeds like a budgie without a beak.
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4th August 2020, 03:46 PM #3
Kerro works just fine. As far as I know what the poms call paraffin is the same thing. I have one and it gets used now and then. You need metho in the dish to pre heat and turn the fuel to a gas like Chief Tiff said. I can see it has been a while since he used one so dont pump to start. The fuel will gas off and cause its own pressure and a small jet of flame will start. After that you can pump. To shut off open the valve that lets the pressure out of the tank. You will also have to find some jet cleaning prickers to make it work.
PRIMUS MONITOR 12 NIPPLE PRICKERS JET CLEANING WIRES NEEDLE STOVE VINTAGE NOS | eBay
Regards
John
PS just found this.
Primus No. 632 Blowlamp (1954) - Lighting - YouTube
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4th August 2020, 06:20 PM #4Senior Member
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I have used these only with kerro ( as petrol might work -but seems scary) always start up outdoors as the startup can include spewing burning liquid kerro -until it vaporises properly. Lpg a safer option -but with care the old ones still work.
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6th August 2020, 04:25 PM #5
First, I think that the gentleman who made blow torches was Otto Bernz, The Benz chappy made cars.
The principal of the blow torches was the same as that of primus stoves. To operate one you need:
- kerosene,
- metho,
- pricker.
Pricker.jpgPricker
The operating technique is:
- Three-quarters fill tank with kerosene,
- Check that control valve is turned off,
- Prick the fuel jet in the lamp chamber,
- Fill the reservoir with metho and light (this pre-heats lamp and causes kero to vapourise),
- When metho almost burnt out pump tank up to pressure,
- Undo control valve, kero vapour should ignite from remaining metho flame - quickly hand light if it does not do so,
- Adjust flame with control valve knob,
- If flame splutters or is uneven re-prick fuel jet (you may have to re-light).
Remember, the torch burns kero vapour, not liquid kero. The area around the fuel jet must be heated so that it vapourises the kero - KEY.
If the kero is not vapourised then you will get a stream of burning kero ejecting from the torch - will set fire to anything within 2-3 metres.
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