rickofudall
Joined: 19 Sep 2009
Posts: 1392
Location: Udall, KS, USA
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 Posted: Sun Aug 24, 2014 7:39 pm Post subject: Vacuum gauge carb synch setup |
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After I completed Rotax training at Lockwood Aviation in the spring of 2007 I came home and built a setup just like the one that Lockwood sells. It worked great except for one thing. The fuel valves used in the setup to dampen the pulses in engine vacuum were just too coarse in adjustment. Several times I accidentally closed the valve and didn't notice until I made a cable adjustment and got no change in gauge reading. Figuring I was going to be using these for the rest of my life, I sold the first set on eBay and went looking for better gauges and valves. I found everything at McMaster Carr. I bought 4" (my old eyes need all the help they can get and I don't have to worry about my glasses getting blown off in the prop blast) stainless steel case glycerin filled gauges, p/n 38605K3 and needle valves p/n 4995K13. Let me warn you before you look them up they're pricey. To make sure they were well protected I bought a nice case from Harbor Freight p/n 69318 to protect them. The needle valves give me precise control so I can adjust for about .2 in of wiggle in the needles. I set them once and I can't remember ever adjusting them again.
Whatever you use in your vacuum gauge setup, two tips: Use at least 5 feet of line to connect them to the engine. That gives you plenty of room to keep the gauges out of the engine compartment and out of harm's way. Put a union connection in the at the engine end. Not all engines take the same size of hose to connect them to the intake manifold. The union allows you to change out the ends quickly so you don't have to waste time improvising if the owner is watching, or helping do the carb synch.
Rick Girard
- Trust those who seek, doubt those who find.
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