Date:         Wed, 9 Sep 2009 19:49:34 -0400
Reply-To:     David Beierl <dbeierl@ATTGLOBAL.NET>
Sender:       Vanagon Mailing List <vanagon@gerry.vanagon.com>
From:         David Beierl <dbeierl@ATTGLOBAL.NET>
Subject:      Re: Dometic RM182B orifice
Comments: To: Alan Felder <dieseldoofus@GMAIL.COM>
In-Reply-To:  <3d35438b0909091619w5d49e912n9e24ed4e010c66e9@mail.gmail.co m>
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At 07:19 PM 9/9/2009, Alan Felder wrote:
>Anyone familiar enough with these brass fittings to say if the hole is just
>a hole, or is it supposed to have some quartz fitting inside the hole?
>Dometic no. 24 jet.

I'd be pretty surprised if it did, in fact I can say categorically
not.  I've looked at them under 40x and it's a pretty small hole but
I've seen no sign of a ruby or anything else there.  I have some
jewelers-size welding tips of which the smallest is ruby.  It's no
tiny piece, the orifice is pierced in it and that's that.  Must be
1/16" across.  The stuff's cheap, wouldn't be worth their
manufacturing effort to put the absolute minimum possible size in it.

>   Somewhere I read that the jets have some very small
>insert of quartz or something, which would make the flame smaller I
>suppose.

Actually a smaller hole would make it leaner.  If you cut air and gas
down proportionally it would be smaller but keep the same mixture.

A tip if it doesn't like to run at high altitude -- turn the gas
pressure up a couple of inches W.C.  Dometic used to have a
high-altitude jet, but no longer.

>   I have looked at mine with a microscope and don't see how there

Just for interest, what sort of scope and illumination?

Yours,
David