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Subject:bilge blower speed control - HOW?
From:Holly and Chris Mills
Date:Thu, 22 Feb 2001 19:42:35 -0800

Okay - got a couple general electricity questions. My application is a 78
VW Westy (aircooled) but figured it's general car question basically.

Bought two Atwood 3" bilge blowers today. $17.36 each if you're curious.
Plan on replacing my single cneter mounted VW aux blower (over the engine)
with these guys.

Going to have to work out two small details - a flapper to control backflow
through the blowers when not in use (the VW version has a flapper on each
side) and speed control.

These little guys put out 145 cfm each so I doubt I'll need to run them at
full blast very often. Of course since they are going to be set up with one
providing thrust for only one side - I'll have to run both with I need the
heat/blowers.

How do I construct a variable speed control for these? I need the
equivalent of a ceiling fan speed control. Hmmm - would that work?

I don't want to put them down stream of the heaters because they won't last
like I want them to - the box says don't subject them to more than 160
degrees continuously. I figure I'll risk hanging them in the engine
compartment and see what happens.

That also rules them out as inline blowers... <grin> I have concerns with
creating a situation where I could suck in exhaust fumes through seams in
the exhaust system since instead of adding positive pressure, I would be
adding negative pressure (basically).

What do you think?

Thanks everybody...

CHRIS in Tennessee
scmills@tntech.edu
ICQ: 5944649

'78 VW Westfalia
'65 Beetle (Type IV powered)
'99 CR-V 5 speed
'49 Chevy 3100 Pickup
'81 Honda CB900C

For Sale: 1 1/2 LM 110HP Corvair engines
            1 EM 80 HP engine
            1 LM Corvair 4 speed, 3.55 gear ratio
            1 set of header pipes for a Corvair
            1 adaptor plate for Corvair engine to VW transaxle

            1 1949 Chevy Pickup, 3100, black, original, good driver
                 restored bed            $3000

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