Sometimes you do need regulators. I have a 2 inch and an 8 inch venturi on my plane. The 2 inch runs my turn & bank. Suprisingly, the 2 inch pulls over 4 inches of vacuum and I had to use a regulator to lower it to about 2.5.
The regulator is just a small adjustable valve. Weighs hardly anything. I don't know what it cost, someone gave it to me. Fred. ---- David Winters <[EMAIL PROTECTED]> wrote: ============= Do you REALLY need a regulator on a VENTURI system? I can understand needing one with a vacuum pump, but, so far as I can tell, my venture is usually hard pressed to get enough gyro speed, let alone too much. How much does a regulator weigh, anyway? Cost? (As you may guess, I do not have one.) Dave W -----Original Message----- From: [email protected] [mailto:[EMAIL PROTECTED] On Behalf Of [EMAIL PROTECTED] Sent: Friday, February 22, 2008 3:59 PM To: [EMAIL PROTECTED]; [email protected] Subject: Re: [ercoupe-tech] Vacuum Line Plumbing Hey Frank: I understand your mechanics dilema. He/she wants to make sure it is correct, and probably has never worked on a vacuum system driven by a venturi. First of all, DO NOT use common AN fittings when installing the components. Vacuum fittings are made which have a gradual sweep instead of a sharp bend and do not reduce the amount of air (RAPCO) is one kind. They cost about two or three times the AN fittings but believe me it will really make a difference. Second, use a quality hose to move the air. The less expensive tubing from Home Depot or Lowes will not maintain its shape and will cause a loss of air flow. Third, install the fittings with teflon tape (carefully so as not to get any particles in the gyros) or some other form of sealant that will allow the fitting to be positioned in a manner that provides the greatest air flow i.e. the least change in direction of the flow the better. Lastly, if your regulator is not marked, the largest opening goes to the venturi and the smallest goes to the gauge. The other two go to the individual instruments. Normally the are marked P, T, H and G in the order described above. Questions? (I know nothing!) Lynn Nelsen _____ Delicious ideas to please the pickiest eaters. Watch <http://living.aol.com/video/how-to-please-your-picky-eater/rachel-campo s-duffy/2050827?NCID=aolcmp00300000002598> the video on AOL Living.
