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IndianaRog
Steam Supreme Being
Joined: 26 Dec 2006
Posts: 9327
Location: Indiana, USA
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 Posted: Sat Oct 31, 2009 2:19 pm Post subject: What is the thread used on a PM research whistle??? |
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I know several folks here have bought that whistle and had adaptors machined to fit specific engines.
I would like to get one but need to know the thread so I can get an adaptor made to fit a Jensen boiler.
Help?
Rog
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Les
Steam Supreme Being
Joined: 03 Nov 2007
Posts: 17547
Location: Bournemouth, Dorset, England.
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| Posted: Sat Oct 31, 2009 2:35 pm Post subject: |
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From their website, hope this helps.
Authentic scale model Steam Whistle with adjustable pitch. This beautiful little whistle has a nice crisp tone. It looks and works just like its full-size predecessor. Cast bronze valve and handle with brass pipe. Thread size 1/4-40, 2 3/4" high. Let her blow!
http://www.pmresearchinc.com/stor...oductid=3151&cat=0&page=1
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IndianaRog
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Joined: 26 Dec 2006
Posts: 9327
Location: Indiana, USA
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| Posted: Sat Oct 31, 2009 2:50 pm Post subject: |
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Thanks Les...I didn't think to check there!!!
Rog
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redryder
Steam Legend!!
Joined: 08 Dec 2007
Posts: 3861
Location: Connecticut, USA
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| Posted: Sat Oct 31, 2009 3:31 pm Post subject: |
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Yup... quarter forty threads.
Neat idea..... Those little whistles really look the part in addition to working well.
Gil
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xlchainsaw
Hero Steamer
Joined: 30 Oct 2007
Posts: 1942
Location: brisbane australia
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| Posted: Mon Nov 02, 2009 3:12 am Post subject: |
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i made an adaptor for mine. rog im not sure if a jensen boiler will blow it!????? lizs se3 wont! also apart from the quarter 40 thread its tapered! if you like .  before buying...... i can take mine to clintons and see how it goes on his jensens.??????
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IndianaRog
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Joined: 26 Dec 2006
Posts: 9327
Location: Indiana, USA
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| Posted: Mon Nov 02, 2009 3:31 am Post subject: |
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Glenn, thanks for the info...but I hope I CAN get it to work, as I want to put it on my Jensen 51 replica boiler. 5 inch x 10 inch boiler with 1620 watts of immersion rod heaters inside. I can get and maintain 30 PSI easily, even with it running flat out under full load.
I want to do it for two reasons...
1) Jensen in my opinion used too small a whistle on that size of boiler...same whistle used on even the smallest Jensen was used on the 50's and 51's...should be twice as big at least just to look proportional!
2) I want to blow it occasionally 
Glenn, if you think you could make me such an adapter in brass, I would gladly pay you for it and the shipping...just let me know...I would have to look up the thread in a Jensen boiler top, or maybe you know it already.
cheers,
Rog
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xlchainsaw
Hero Steamer
Joined: 30 Oct 2007
Posts: 1942
Location: brisbane australia
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| Posted: Mon Nov 02, 2009 3:58 am Post subject: |
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its no problem to make an adaptor. i would need to check the thread of a jensen . i had no idea the jensen boiler was so BIG !!!!yes that would power it!!! so your engine has a standard 3 inch boiler!!! (10 by 3 ) wow im starting to see the appeal of the jensens!
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xlchainsaw
Hero Steamer
Joined: 30 Oct 2007
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Location: brisbane australia
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| Posted: Mon Nov 02, 2009 4:02 am Post subject: |
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correction!!!!!!!!!  5 inch boiler!!! thats huge!!! does it have boiler tubes????
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redryder
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Location: Connecticut, USA
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| Posted: Mon Nov 02, 2009 12:06 pm Post subject: |
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| xlchainsaw wrote: | | correction!!!!!!!!! :shock: :shock: :shock: :shock: :shock: 5 inch boiler!!! thats huge!!! does it have boiler tubes???? :D |
The Jensen 50 boiler has 3 immersion heaters as seen on Roger's and the most recent Jensen 50 built (5-6 years ago) had 2 660 watt heaters.
Gil
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IndianaRog
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Joined: 26 Dec 2006
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Location: Indiana, USA
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| Posted: Mon Nov 02, 2009 1:37 pm Post subject: |
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Hi Glenn,
My 5" x 10" Jensen 50 boiler originally had three 300 watt immersion rod heaters for 900 watts total. When I converted the 50 to a replica 51, I replaced two of the three rods with the newer 660 watt version...now total of 1620 watts. She boils fast and furiously! It does not have any superheater tubes since the heat is applied internally, much like an electric hot water heater.
The Jensen 50/51 boiler is the oddity in the Jensen line, much more common to have a 2.5 inch x 6 inch of the size Clinton got from me, or 3 inch x 6 inch is the next size up. They make a couple of smaller sizes I don't recall measurement on, but they are used on their Jensen 60 and 85 models.
I need to look up the thread on the Jensen whistle hole...it is the same for every boiler they make...I will let you know.
Rog
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