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HelicopterEngines Plugs Mufflers Fuel › OS91 with Perry Pump Plumbing
04-26-2002 08:04 PM  15 years agoPost 1
MG

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California

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Hi,

Can someone point me to pictures or a diagram of the OS91 and Perry pump plumbing? Thanks

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04-26-2002 08:06 PM  15 years agoPost 2
Augusto

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US

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These are from Curtis Youngblood's Vigor.
[break]

Avant Aurora Ultimate

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04-26-2002 08:30 PM  15 years agoPost 3
z11355

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New England

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04-26-2002 09:04 PM  15 years agoPost 4
MG

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California

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Hi Guys, thanks for the replies!

Hey z11355,

I noticed in your diagram you are still using a line from the fuel tank to the pressure tap on the muffler. I was under the impression that the line to the muffler would be eliminated. In fact, I just took a look at the instructions and it states that the muffler pressure should not be used. I'm missing something? Can you please cofirm.

Thanks

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04-26-2002 10:34 PM  15 years agoPost 5
mystar60

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Clifton, NJ

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PERRY PUMP

Can someone please explain the reason for adding the perry pump and the advantages of this setup . I just installed a OS 91 in my Vigor and am in the process of running in the enging - so far 5 tanks of fuel .
Thank you

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04-26-2002 11:10 PM  15 years agoPost 6
MG

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California

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The Perry pump is used to ensure constant fuel flow to the engine.

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04-26-2002 11:14 PM  15 years agoPost 7
S_Ciambra

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Palermo - Sicily - Italy

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Regards

Salvatore Ciambra
Gruppo Elicotteri R/C "Ready to Win" - Palermo - Italy

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04-26-2002 11:29 PM  15 years agoPost 8
MG

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California

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OK,

Now I am more confused than before. There has been three different posts with either a picture or a diagram and all three are different.

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04-27-2002 01:02 AM  15 years agoPost 9
Blair

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Republic of Canuckistan

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Hi DavidH,

Why the overflow line with the one-way valve?

Which way is the one-way going?

Or does this allow the engine to bypass the pump if it needs more fuel?

Blair

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04-27-2002 01:03 AM  15 years agoPost 10
MG

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California

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DavidH,

From the picture it appears that the "open" line will run to the fuel tank clunk line. Am I to assume that your friend leaves the muffler attached to the other end of the fuel tank?

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04-27-2002 10:32 AM  15 years agoPost 11
Optech

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San Diego, CA.

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They way it was explained to me was that by using the pump in this manner you set up a constant fuel flow and that the "T" to the carb inlet lets the motor pull as much fuel as it needs from that flow. Any excess not used is directed back to the fuel tank. I suppose you'll see many different ways to get that done.

Mike

Viva La Airtronics!

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04-27-2002 02:08 PM  15 years agoPost 12
GMPheli

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W. Bridgewater, MA USA

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This is a trick to use a pump on a non pump carb. It's been around for years. It helps keep the midrange from being overly rich. You can use it with the perry vibrating pump too.

Alan Angus

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04-27-2002 02:53 PM  15 years agoPost 13
MG

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California

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OK,

But which way does the check valve go?

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04-28-2002 04:00 AM  15 years agoPost 14
JoeS

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USA

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JUST BUY A YS 80

The YS is cheaper now!

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04-28-2002 04:29 PM  15 years agoPost 15
GMPheli

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W. Bridgewater, MA USA

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The check valve needs to flow from the carb back to the tank.

Alan

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04-28-2002 09:21 PM  15 years agoPost 16
mfendley

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Saint Marys, GA

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Hey David - the picture from the model show might work (although its different from Curtis' setup - and we know that works). The discharge of the pump is the highest pressure, and in suction of the pump is the lowest. The carb has a constant loop of fuel to take from. The only difference between the two setups is that Curtis' returns the fuel to the tank (at muffler pressure) and the show setup returns the fuel to the pump suction (muffler pressure + the head of the fuel due to fuel height above the pump suction). Do you know if the model show setup uses muffler pressure?

On another note, are you going to the Orlando Classic? If so, see you there!

Mike

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HelicopterEngines Plugs Mufflers Fuel › OS91 with Perry Pump Plumbing
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