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Vaderluck

Senior Heliman

Melbourne - Australia

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I would like to know how the regulator work before disassemble it to clean.
Anyone got info how they work ?

08-27-2016 11:54 AM
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dkshema

rrMaster

Cedar Rapids, IA

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What's inside:

From left to right, along the bottom row of parts:

Needle valve
Lever
Spring
Pin which holds the lever in place, and about which the lever pivots
Silicone diaphragm
Screws that hold the two halves together.

Top parts are the housing top and bottom halves. Note the the bottom piece has five holes in its center, therefore this side of the silicone diaphragm is subject to ambient air pressure.

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How it works:

Fuel, pressurized somewhere between 2 and 12 PSI (from the crankcase via a one-way check valve connected between the backplate of the motor and the vent line of your fuel tank) will enter the regulator at the carburetor nipple.

The needle valve (stop valve in the picture) is spring-loaded (by the lever and spring) such that normally, the fuel inlet is plugged, and no fuel enters the regulator.

The top side of the silicone diaphragm is at ambient air pressure. When the piston in your motor is on the up-stroke, there is an area of low pressure in the venturi of your carburetor, where the spray-bar is located. This puts the bottom side of the diaphragm at a lower pressure than the opposite side which is at ambient air pressure. The center of the diaphragm moves downward, the right end of the lever goes down with it, while the left end pivots up slightly. This pulls the needle valve up slightly, so it's no longer plugging the carb inlet, fuel flows into the regulator body, and into the engine's main needle/spraybar assembly.

On the downstroke of the piston, the low pressure area in the venturi is no longer present, the spring and lever force the inlet needle valve closed again, until the next cycle.

This is a demand regulator. Fuel is only allowed into the lower chamber when the engine needs it.

The OS regulator is a refinement of the Cline regulator which James O'neal at OMI used to install on certain large OS 91's.

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Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

08-28-2016 02:36 AM
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balsapro

Veteran

Gallatin,TN

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other than location how is this different from the YS regulators?

seems very similar to me.

Build the Best, Fly the Best, Crash the Best

08-28-2016 02:51 AM
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dkshema

rrMaster

Cedar Rapids, IA

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They are similar, just implemented in a different manner.

The other difference, is that YS pretty much has had a demand regulator all along.

OS had to go through several iterations of fuel delivery systems before finally going with the obvious solution.

-----
Dave

* Making the World Better -- One Helicopter at a time! *

Team Heliproz

08-28-2016 03:14 AM
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Four Stroker

Elite Veteran

Atlanta

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YS and OS similar idea. YS went through many iterations of what the diaphragm should be made from. Settled on tiny condoms. YS uses timed positive pressure to open the fuel valve. YS diaphragm not exposed to the atmosphere.

Model carburetors started out as low venturi pressure sucking fuel and an idle air bleed screw. After many years of iterations we now have more real carburetors.

Similarly we now have real battery chargers that monitor individual cells. Would have been better on nickel cadmium cells as well. Original NiCD chargers were a diode and a resistor at 120 Volts.

08-28-2016 03:26 PM
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Vaderluck

Senior Heliman

Melbourne - Australia

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Thanks dkshema. Always very helpful.
The diaphragm is made from silicone. So would it suffer the same fate as the the fuel tube clunk where it is soften/broken down sometime later ?

08-29-2016 01:10 PM
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Four Stroker

Elite Veteran

Atlanta

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More importantly, it will be destroyed if you use the typical non-silicone safe after run oil.

08-29-2016 02:19 PM
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Dr.Ben

rrMaster

Richmond, VA, USA

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On the OS, due to the reg's physical position on the engine, you can get away with using ATF or similar petroleum based preservative oil and not foul the reg's diaphragm. We all did so for years, and in that "we" was the man who was instrumental in the design of it. In the case of the YS reg, there is a direct communication between the crankcase and the reg on the bottom of the front housing, so a silicone safe oil is imperative.

The silicone diaphragm in the OS has excellent longevity. Remember that the primary reason the silicone tubing in a fuel talk goes bad is due to exposure to exhaust gases as occurs with a muffler pressure set up. Tubing lasts WAY longer in these backplate pressure driven engines.

Ben Minor

Team Synergy Team Futaba Team Kontronik USA
Progressive RC

08-29-2016 03:58 PM
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ssmith512

Key Veteran

Indianapolis, IN USA

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Tubing lasts WAY longer in these backplate pressure driven engines.
I concur. Been using the same tank clunk line for over two years now.

Steve

08-29-2016 10:26 PM
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YankieSole

Senior Heliman

Lynchburg, virginia

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Is there a trick to getting the diaphram back inside the regulator after disassembly? I took mine apart to clean it after buying the engine second hand and man was it a pain in the arse to get back together.

Robert

09-02-2016 12:54 AM
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wjvail

Key Veteran

Meridian, Mississippi

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Hmmm... It shouldn't be hard to reassemble. The diaphragm just drops in and the case bolts up. How was your's difficult to put back together?

The below video won't help you put your diaphragm back in but does speak to the OP question.

Watch at YouTube

"Well, Nothing bad can happen now."

09-02-2016 01:27 AM
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YankieSole

Senior Heliman

Lynchburg, virginia

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Sorry about that. Didn't mean to hijack the thread. My diaphram didn't want to sit down in its place. It was a pain to get the two halves back together without pinching it

Robert

09-02-2016 01:58 AM
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Locktite

Veteran

N.J

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Nice video

Synergy 766 716mm-Synergy 766- SAB Black Thunder-SAB 500 Sport

09-02-2016 03:43 AM
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