Kevin, the mechanical pressure gauges require a 1/8 line to pass the fluid into the gauge – I don’t use any for that reason.
Mechanical temperature gauges have a bulb that inserts into the fluid cavity, their output is wired back to the gauge – they are okay if you ask me, I use
one for water temp. Jeff
From: Rotary motors in aircraft [mailto:flyrotary@lancaironline.net]
On Behalf Of kevin lane
Sent: Thursday, January 14, 2010 11:41 PM
To: Rotary motors in aircraft
Subject: [FlyRotary] mechanical gauges
I was asking summit racing about their mechanical gauges, wondering if the price included all the necessary parts. they told me that the oil pressure and water temp hook up directly with an 1/8th"
line that I cut to fit. I questioned whether the water temp would work that way since water wouldn't be circulating thru the line. do mechanical temperature gauges work that way? I assumed there must be a sealed , fixed length bulb/line arrangement that
converts temp into line pressure?
what are the pros/cons of using mechanical vs. electrical gauges? I have some of them currently in my plane but will need gauges to run the engine initially for ground tests, and hate to pay for
duplicates, so leaning towards the cheaper mechanical gauges. kevin