I wanta do an electric Krmann Ghia.
Wilton
----- Original Message -----
From: "Wonko the Sane" <don.b...@gmail.com>
To: "Mercedes Discussion List" <mercedes@okiebenz.com>
Sent: Saturday, February 14, 2009 8:07 PM
Subject: Re: [MBZ] Frankenheap failures, and rites of passage
> In your spare time, would you please come up with plans for an electric
> W-123?
>
> On Sat, Feb 14, 2009 at 6:42 PM, Jim Cathey <j...@windwireless.net> wrote:
>
> > Some may recall that the cheap Harbor Freight heat gun I was using
> > as part of the Frankenheap's preheater seized up and burned out,
> > and I've been mulling over how to fix this.
> >
> > A few days ago I grabbed a three-wire computer cooling fan from the
> > discard pile at work, it's rated 12 V at 250 mA. (Of the three such
> > fans there today, two were siezed up.)
> >
> > Yesterday I played with the cooling fan on the bench and I found that
> > on the power supply the Black wire was negative and the Yellow
> > positive. (Leaving White as the presumed tachometer wire.) The fan
> > turned nicely and was very quiet, but only moves a modest amount of
> > air. Enough for the preheater? We'll see.
> >
> > I got out the heating element and checked its motor taps. I found
> > two (of the four) terminals that had 14 VAC on them, so I dug out
> > a full-wave bridge rectifier that I'd used for one of the prior
> > preheater version attempts, and hooked it all up on the bench.
> > Nothing but buzzing. So I got out a small filter capacitor and wired
> > it in too. That did it. The fan blows air, but not a whole lot. I
> > suppose I should try assembling the mess into something that'll work,
> > but I was out of time. (This is turning into a real pain in the ass.)
> >
> > Today I cut out a cardboard template for the air funnel to mate the
> > box fan to the heating element and got it shaped. I then traced it
> > out on a piece of microwave oven sheet metal, and cut and welded that
> > into shape. (That took hours, in fact.) As a side-job I got Daniel
> > to weld! I gave him a chunk of metal and the helmet, and he tried
> > writing his initials on it with the Hobart. It sort of worked. After
> > practicing a bit he used a clean piece of metal so that he could take
> > it to school or something like that. It didn't really work out so
> > good, but I'm very proud of him. He's calling it art now. ("This
> > [spot] is a bird...")
> >
> > Myself, I'm not so proud of. Once I got the sheet metal banged into
> > shape I wired up the heating element and the fan, and got it all put
> > together. By early afternoon I was ready to test. Plugged in the
> > thing fired up and started blowing out hot air, so I jacked it into
> > the car. After a few minutes, the new preheater caught on fire! (Not
> > enough airflow.) Disgusted, I threw the abortion into a snow bank
> > to put it out. Some time later I'll salvage what I can from it.
> >
> > I'm going to have to come up with another heat gun or hair drier. But
> > in the meantime I'll just continue to use the space heater inside the
> > cabin.
> >
> > -- Jim
> >
> >
> >
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