Mailing List flyrotary@lancaironline.net Message #2418
From: Russell Duffy <13brv3@bellsouth.net>
Subject: RE: [FlyRotary] VDO Cockpit Black guages and sender thread size
Date: Tue, 5 Aug 2003 12:14:33 -0500
To: 'Rotary motors in aircraft' <flyrotary@lancaironline.net>
Message
I'm planning to order the VDO Cockpit Black Gauges (egauges.com). Here's what I have in mind...
 
310-012 oil temp - 300f
310-039 water temp - 250f
350-065 oil pres - 100psi
150-052 turbo boost - 30psi
310-901 cyl temp - 600f
310-953 EGT - 1600f
310-041 volts - 16v
 
Does this match you're list?
 
What senders (thread size or model numbers) did you get with each gauge and where did you hook them up? 
 
Hi John,
 
I don't have the model numbers written down, but I remember the ranges.  Your list looks fine, with the following comments. 
 
- I don't currently have a cyl temp, EGT, or voltmeter (will come up with something temporary though), so I can't comment on those particular gauges. 
 
- I originally bought all my senders in 1/8" NPT size, and planned to use adapters.  This turned out to be a bad idea, so get the proper threads.  Here are the sizes for the ones I used:
 

Water temp in water pump housing- M12 X 1.5

Oil temp (in pan)- M16 X 1.5

Oil pressure- M10 X 1.0

 
- You'll notice that they don't sell a 250 degree water temp sender in the M12 x 1.5 thread, but they do sell one in a 300 degree range.  I know this very well, because bought the 250 gauge and sender, and had to turn around and replace it with the 300 degree combo.  Of course that means it will say "oil" on the front, so you'll have to put a new label over it.  
 
- I got the 150 psi oil pressure gauge, but your 100 degree range is a better choice.
 
- Finally, I didn't order the boost gauge in the cockpit black series, because I didn't like the ranges that were available.  I personally think the vacuum/boost range is more useful than the ones that are strictly boost.  You'll spend a significant amount of time on the vacuum side of the gauge, and will be able to see the needle approaching boost.  I mounted my gauge permanently, front and center on the glare shield, because it makes a better quick reference for the amount of work that the turbo is doing.  It also tells a different story than MAP.  The boost gauge is a differential device, so you will see when the turbo is producing boost over ambient pressure.  You could figure this out with a static absolute pressure sensor too, but the boost gauge gives it to you directly.  The cockpit black series goes from 30 vacuum, to 25 pressure.  Since I can't imagine using anything over about 8 psi of boost over ambient, I wanted that range to be expanded more.  I chose the vision 1 series (150-361) since it went from 30 vacuum, to 15 pressure.  I would have preferred that it have a black bezel, but the range was more important to me.  It doesn't even matter that it doesn't match the other gauges, since this one stays, and the others are temporary.  
 
Cheers,
Rusty  
 
 
 
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