The vacuum lines need to be at a place where the pressure during the intake cycle is above the combustion chamber pressure. This is generally right past the throttle body. There is no difference between turbo and NA, as long as the turbo is before the TB. 

If the turbo is after the TB, the vacuum pickup would have to be from the plenum. In any case, after the TB and after a turbo.

One of my turbo assumptions, before or after the TB, may be wrong, please excuse it.

 

Richard Sohn
N2071U

http://www.fairpoint.net/~res12/home.html

 

From: CozyGirrrl@aol.com

Sent: Sunday, April 08, 2012 9:25 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: OMP Plumbing

 

Richard, Where would you plumb the vacuum line in case of turbo?

 

Chrissi & Randi
www.CozyGirrrl.com
CG Products, Custom Aircraft Hardware
Chairwomen, Sun-N-Fun Engine Workshop

 

In a message dated 4/8/2012 8:57:02 A.M. Central Daylight Time, res12@fairpoint.net writes:

Mark, this pump uses an o-ring. It is the same o-ring on the pump and the adapter. I have some laying around. Let me know if you need them, and I will put two in an envelope.

Need a mailing address on my private email.

 

Richard Sohn
N2071U

http://www.fairpoint.net/~res12/home.html

 

From: Mark Steitle

Sent: Sunday, April 08, 2012 8:40 AM

To: Rotary motors in aircraft

Subject: [FlyRotary] Re: OMP Plumbing

 

Kelly, 

 

Wouldn't you know, I found my 13b front cover.  As they say, "If it had been a snake, it would have bit me."  So, you can keep the one you have (maybe make a clock out of it).  It is off an '89 6-port engine.  The pump I have is off the same engine, so everything fits.  Anybody know where I can get a gasket to fit this pump?

 

Mark

On Sat, Apr 7, 2012 at 10:30 PM, Kelly Troyer <keltro@gmail.com> wrote:

Mark,

    Do you have a 86-88  or 89-91 metering pump ?.............I have both covers but Richard's adapters are different

for these model years.............

 

Kelly

On Sat, Apr 7, 2012 at 10:09 PM, Mark Steitle <msteitle@gmail.com> wrote:

Richard, 

 

Thanks for the great information.  That supports what instinct was telling me.  So, anywhere upstream of the butterfly should work?  I'm running three 1-barrel throttle-bodies on my p-port 3-rotor.  If I understand you, I should hook the check valve for each rotor upstream of the respective TB butterfly, correct?

 

Mark

On Sat, Apr 7, 2012 at 9:54 PM, Richard Sohn <res12@fairpoint.net> wrote:

Mark,

 

you need the injection check valves hooked up to your intake plenum. The oil intake only works with the pressure difference between the combustion chamber and the plenum during the intake cycle. The check valve prevents oil from being pushed into the vacuum lines by reverse pressure fluctuations.

As far as the control lever is concerned, you have a good plan. You may want to make the lever position adjustable so you can set the oil consumption to a level that makes you and the engine feel good.

FWIW

 

Richard Sohn
N2071U

http://www.fairpoint.net/~res12/home.html

 

From: Mark Steitle

Sent: Saturday, April 07, 2012 8:10 PM

To: Rotary motors in aircraft

Subject: [FlyRotary] OMP Plumbing

 

Is anyone running an oil metering pump (OMP) that can help me figure out how the lines should be connected.  I'm planning on using the Mazda banjo fittings to hook up to the OMP, but what do I do with the check valves.  Do you connect the check valves to a vacuum source or just block them off?  Will the system work properly if I plug the check valves?  I plan on locking the lever in the full open position.  Will this work for a/c use?  I'll be using Richard Sohn's adapter with a 1 gallon reservoir filled with 2-stroke oil.   

 

Mark S.