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Richard Sohn OMP (MOP) Adapter

Old 10-30-2006, 12:14 PM
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Richard Sohn OMP (MOP) Adapter

I thought I would let everyone know that today I sent off the check for Richard Sohn's OMP adapter. I am looking forward to installing this mod as I think using 2-cycle oil (Idemitsu) instead of crankcase oil to lubricate will provide better lubrication and greatly reduce the carbon buildup.

When I talked with Richard today, he also let me know that he has added an "Adjuster" option to the Adapter. The "Adjuster" was designed to allow you to control the OMP flow settings without the need for the Engine Management System (EMS), which is necessary for airplane applications that do not have an EMS (which is why he started making these in the first place).

The Adjuster sets the OMP base oil flow rate and then the OMP actual rate adjusts up with engine RPM (higher is more). By adjusting the base rate higher you can increase flow rate across the whole RPM range to your desired amount. This in effect, can provide someone the ability to not only use better oil, but to increase the flow rate to whatever level you desire (up to the maximum capacity of the OMP), eliminating the need to "premix" to achieve the additional lubrication many are seeking.

I did not get the "Adjuster" as I intend to let the EMS control the flow (I am satisfied with the latest flash settings for OMP flow), but for those who want more lube such as current premixers, FI engines, etc. the Adapter with the Adjuster just may be your ticket.

I will attach some more data from the updated flyer he sent me in the next post.

NOTE: Sohn adapter can not be installed on any Series II RX-8 2009-2012 MY, the Series II Oiling System is completely different.
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Old 10-30-2006, 12:21 PM
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Metering Pump Adapter for Wankel Engine.

Wankel engines such as the one used in the MAZDA RX7 sports car need oil in the
combustion area for lubricating the metal seals.

Most stock engines use a metering pump pumping a small amount of engine oil from the
oil pan into the intake manifold and/or directly into the combustion chamber. Engine oil
is designed to lubricate sleeve bearings and carry heat from the engine interior to some
cooling areas. In the RX7 the heat is removed from the oil in an oil cooler. When engine
oil is getting into the combustion chamber, it only is burning partially, leaving some
unburned deposits behind. These deposits can build up and reduce engine performance.
One obvious method of preventing this is to disconnect the metering pump altogether and
mix two-stroke oil to the gasoline like some older two-stroke engines require. With this
method it has been demonstrated that two-stroke oil is an effective lubricant and there is
no build up of combustion residues.

The Metering Pump Adapter, as offered by Richard Sohn takes the solution one step
further in allowing to still using the stock metering pump but supply it with two-stroke
oil. With the Adapter installed, all that is needed is a small oil tank with two-stroke oil,
connected to the Metering Pump Adapter. The oil level in the tank should never be less
then 6 above metering pump.Oil consumption is approximately 1/100 of fuel used.

ADJUSTER FOR THE RENESIS OMP

The RENESIS engine is becoming increasingly popular for conversion for use in
experimental airplanes. Using the Oil Metering Pump for top lubrication is an open
question, because most after market EMSs do not provide an output for OMP control.
In the RX8 automobile the OMP oil flow is controlled by engine RPM and pump-rate.
The pump-rate control is activated by the engine computer. This pump-rate control is
used to increase oil flow when there is an increased power demand at low engine RPM.
This condition does generally not occur in an airplane.

When the engine is used with an EMS with no output for the OMP, the only option is to
mix some oil in the fuel for top lubrication. The preferred oil used for this method is two-
stroke oil for its ability to readily mix with gasoline and lower combustion residues than
regular motor oil.

To overcome this draw back in aircraft use, the OMP pump-rate control can be fixed to a
certain position, and the oil flow will only change with engine RPM.

The RX8OMP is equipped with a position sensor, (pic 1.), which monitors the position of
the control shaft on the pump. This position sensor may be replaced with an adjuster
(pic.2.) to set the control shaft to a fixed position. In this way, the OMP is fully
functional, giving an oil amount comparable to oil mixed in the fuel.



If anyone would like the full PDF file with additional Data, Pictures and Ordering information, send me a PM/e-mail and I will forward.

Last edited by Jax_RX8; 10-30-2006 at 12:40 PM.
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Old 10-30-2006, 08:53 PM
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Please let us know how you like this unit, ie: installation, what kind of oil tank are you going to use, tank location and any difference of carbon build up at the exhaust tips.
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Old 10-31-2006, 07:03 AM
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Originally Posted by Boris and Natasha
Please let us know how you like this unit, ie: installation, what kind of oil tank are you going to use, tank location and any difference of carbon build up at the exhaust tips.
Will do - should receive next week sometime.
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Old 10-31-2006, 07:52 AM
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GTAW has a DIY posted on his website. But for the life of me I can't remember what the address is! Anyway, he tapped the windshield washer tank and used it. It holds a lot and if you have the translucent tank it makes checking the level quite easy. You could also always get one of those tank level sensors installed in it as well.
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Old 10-31-2006, 08:52 AM
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Here is a link to GTAW's DIY for the Richard Sohn's OMP adapter.

http://www.turborenesis.com/ompadapter.html
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Old 10-31-2006, 09:28 AM
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Originally Posted by mikeschaefer
he tapped the windshield washer tank and used it. It holds a lot and if you have the translucent tank it makes checking the level quite easy. You could also always get one of those tank level sensors installed in it as well.
This is my plan as well as I do not really ever use windshield washer fluid anyways.

Also, this tank already has a level sensor (the WW one) that I think will still work after putting in the 2-stroke oil. I intend to do the same as GTAW and tap the tank at the bottom round part that hold the tank secure in the chassis.
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Old 10-31-2006, 09:33 AM
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Originally Posted by tdiddy
Here is a link to GTAW's DIY for the Richard Sohn's OMP adapter.

http://www.turborenesis.com/ompadapter.html
This is an excellent DIY that I read many times before deciding to do this!!!!

I did notice though that my coolant hose arrangement around the OMP (in a 2006) is a little different than what he photographed, but should work almost the same to get enough OMP line slack to install the adapter.
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Old 10-31-2006, 09:56 AM
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I've run my washer tank dry and never realized it. I'll have to check the manual for that one
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Old 10-31-2006, 10:19 AM
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I've got one of these on my RX-7. It's a great mod.
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Old 10-31-2006, 02:06 PM
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this is my next mod!!! will be ordering soon & posting my results...
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Old 10-31-2006, 05:23 PM
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speed source premixes 1ounce per gallon and uses the MOP.
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Old 10-31-2006, 06:37 PM
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why in the world would you use your windshield wash fluid tank instead of just putting in another small tank... even something as small as a quart container will probably last you weeks
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Old 11-01-2006, 07:32 AM
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The adjuster is VERY interesting. Jax, you have mail!

F
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Old 11-01-2006, 12:52 PM
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Originally Posted by r0tor
why in the world would you use your windshield wash fluid tank instead of just putting in another small tank... even something as small as a quart container will probably last you weeks
I am considering a separate tank and have been searching, but they are hard to find that are HDPE 2. The link below is one I am considering, but is only 1 qt (32oz), so you would have to check the oil level more frequently.

http://www.usplastic.com/catalog/pro...uct%5Fid=15084

This may be as big as you can go and actually find a decent location for it on the left, back side (from the front) of the engine bay and keep the winshield washer tank as well.

Last edited by Jax_RX8; 11-01-2006 at 01:11 PM.
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Old 11-01-2006, 02:26 PM
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Tom over at Turborenesis recommended the tank below although he went w/ the windshield washer tank...

tank
cap

if you guys think you can fit this anywhere... let us know...
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Old 11-01-2006, 03:22 PM
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Originally Posted by Jax_RX8
I am considering a separate tank and have been searching, but they are hard to find that are HDPE 2. The link below is one I am considering, but is only 1 qt (32oz), so you would have to check the oil level more frequently.

http://www.usplastic.com/catalog/pro...uct%5Fid=15084

This may be as big as you can go and actually find a decent location for it on the left, back side (from the front) of the engine bay and keep the winshield washer tank as well.

How much are you planning on injecting? 32oz should be enough for several gas tanks worth of driving...
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Old 11-01-2006, 05:37 PM
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Originally Posted by r0tor
How much are you planning on injecting? 32oz should be enough for several gas tanks worth of driving...
Just planning on the standard amount the OMP normally injects (as I also am using FP60 in the gas as well for cleaning and additional lubrication).

For me, oil usage appears to be 1000-1500 miles/quart, so this tank should suffice. I ordered it today and will see how well it fits. I will need to find a strap or something to secure it between the washer tank and the strut post.

Last edited by Jax_RX8; 11-01-2006 at 05:41 PM.
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Old 11-01-2006, 05:40 PM
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Originally Posted by dgrx8
Tom over at Turborenesis recommended the tank below although he went w/ the windshield washer tank...

tank
cap

if you guys think you can fit this anywhere... let us know...
Nice tank, just not sure it will fit.

I ordered the 32 oz tank today - should get in a couple of days. I will let everyone know how it fits.

Suggestions on best way to secure?
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Old 11-01-2006, 06:26 PM
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I like the idea of the washer tank. Bigger is better. It's well-secured and about as elevated as you can get in the engine compartment to help ensure a positive gravity-feed. Its shape also seems like it would help minimize sloshing issues. You don't want those lines to get air bubbles.

I wouldn't want to do without windshield washer though. But I think a smaller resevoir would be fine for the windhsield washer and would work fine in a different location.
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Old 11-01-2006, 06:29 PM
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I'd rather have a tank thats sized for a quart then 2 quarts since 2 quarts will last a good 3,000 miles and in those 3 months the oil is bound to get contaminated beyond belief from condensation
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Old 11-01-2006, 08:41 PM
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Originally Posted by zoom44
speed source premixes 1ounce per gallon and uses the MOP.

It's important to note that they do not run cat converters
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Old 11-01-2006, 09:08 PM
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Originally Posted by Jax_RX8
Nice tank, just not sure it will fit.

I ordered the 32 oz tank today - should get in a couple of days. I will let everyone know how it fits.

Suggestions on best way to secure?
I hear for track days you can burn a quart in double digit miles.
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Old 11-02-2006, 09:56 AM
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using a quart of oil per track w/e is about average. One thing to keep in mind(my mind at least ) is that the FI guys may want to do this mod. I like this concept and my time is probaly coming.
OD
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Old 11-02-2006, 12:47 PM
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Originally Posted by TeamRX8
It's important to note that they do not run cat converters
oh i suppose it is
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