If you are using a steam gauge for the coolant system pressure gauge here are 2 suggestions (this was my experience with the Ford V6):

1)       You need some negative reading on the scale, i.e. the coolant system becomes a vacuum when the engine cools down … anything in your overflow gets sucked back into the engine.

2)       Don’t put the measuring point in the engine block; you will get excessive pressure readings that will scare you. Best place is on the inlet to the water pump, Tee-in a swirl pot or equivalent and leave an air gap.

Jeff Whaley

 

 

 

----- Original Message -----

From: Russell Duffy

To: Rotary motors in aircraft

Sent: Thursday, November 30, 2006 11:39 PM

Subject: [FlyRotary] Re: gauges

 

Fixing to get oil pressure gauge and am concerned about the quality of the electrical sending units.  How likely are they to leak or come apart and cause complete oil loss? 

 

Hi Wendell,

 

Quality senders like VDO are essentially bullet proof.  I wouldn't worry about them at all.  You will also note that most senders have a tiny little hole in the threaded end, so as to restrict the rate of oil loss in the event of a leak.  

Cheers,

Rusty

  

Well, I hate to admit it outright but I'm a dunce when it comes to gauges and sending units.(if you haven't already figured that out you will now). I presume VDO is a brand name and not a type of sender. See some in Aircraft Spruce and Summit Racing catalogs that weren't too pricey but was unsure of the quality. I found an oil press. gauge I liked but no water pressure gauge.

I'm leaning toward all electrical gauges.

 

Speaking of water pressure gauges, since I want to use a water heater core for cabin heat, could the pressure tap be up front (pusher plane) or would the flow when heat is used cause a wrong reading?

 

Wendell

__________ NOD32 1896 (20061201) Information __________

This message was checked by NOD32 antivirus system.
http://www.eset.com