I ripped out the sub-zero start assist system yesterday and it hit me. Why not use this system as a OMP. This is how it would work:

1. Mark off the capacity of the reserve tank per oz.
2. Use the stock bracket and mount the sub-zero assist system somewhere inconspicious in the trunk area(closer to the filler neck for the gas tank would be best).
3. Pick a location to tap a hole either in the gas tank or the filler neck( I plan to install the line in the filler neck just behind the gas cap so that I can visually see if the unit is working or not.
4. Install the hose in the fabricated location on the tank or filler neck.
5. Find a 12v power source( I have an amp so I ran a 4ga wire to the trunk to run that, so that is what i will use).
6. Once you find the power source you will neede the following items.
*On and off switch(Preferably a push button to lessen the chance of
accidental discharge.
* A 10amp fuse kit as an added protection on the circuit
7. Wire everything up and dont forget the ground wire.
8. Give it a test!

NOTE: Another way you can measure the delivery of the Premix is by time. Operate the system and time how long it takes the pump to deliver Ex. 5sec=3oz.

This is an idea I plan to try today, please if you have any ideas or comments please feel free to post. The only problem I see is the Premix oil being to heavy for the pump therefore taking a long time to deliver. but it would still be a cleaner method of operation.

 

Oh yea, I forgot the old saying, you know. There is nothing new under the sun. So if there is anyone out there that has already tried this idea pleas post your experience. I did a search and did not find anything.

 

As I seem to recall from reading through the writeups on feeding the MOP from another source, plastic containers like the one that makes up the sub-zero start assembly won't hold up to oil for very long and will start to leak before long. I actually had the same idea, but did some searching that seemed to indicate that tracking down a metal reservoir or a plastic one specifically formulated to hold oil (like a P/S reservoir) would be a much better long-term solution.

 

not bad, give it a try and let us know how it goes after a few months of driving with it.

definitely a more elegant solution than having to carry around bottles of 2 cycle oil loose in the back, a rag, and funnel.

Assuming I understand you correctly that is.... you want to use the sub-zero tank w/pump as a way to introduce premix oil into your gas tank when you fill up with gas?

 

-this will not be an OMP, simply a complicated method to put 2-stroke in your gas
-you could just buy a funnel and not worry about it
-you don't want some fitting rigged into your fuel system

A better method is to get the OMP 2-cycle adapter from RA. This way, you are actually using the OMP to deliver 2-cycle oil via the stock injector lines in stock amounts.

 

My idea has been to use the OMP adapter that alex is talking about and use the P/S reservoir as the holding tank for the 2-cycle oil. It shouldn't have a problem holding up to the oil and its easy to check the level of fluid in it. I haven't worked out any details yet, but its on my project list. Unfortunately rebuilding my engine is also on my project list so it migh tbe a while before I get to this one.

 

Thanks for the input. I did not know that the plastic continers would not work. I figured since it was designed to hold 90% Glycol based antifreez(very corrosive), Than it would hold up to the oil. I wasn't going to use the cheap rubber hose cause I know that wont work. However i found the perfect spot just behind the rear passenger tail light. Also I ran some test on the pump here is what i found

Capacity = 30oz.

Pump Performance

w/10w30 motor oil @ 55 degrees F it took the pump 00:01:24sec to pump out 1 quart of oil

I used the motor oil first to see of the pump would fail being that the motor oil is way heaver than the Premix and the Antifreeze

w/ Idemitsu Synthetic Primix @ 55 degrees F it took 00:00:52sec to pump out 30 quarts

Here is the performance stats broken down further

Ounces Time

4oz = 4sec
8oz 10sec
10oz 13sec
12oz 16sec
16oz 21sec
20oz 26sec
24oz 31sec
28oz 44sec

The Premix was just a litter heaver than the Antifreeze( the time it took the pump to discharge 30oz of antifreeze was 10sec faster than the premix),not bad.

This is a pretty strong pump I did not expect for it to pump so fast, this means for the guys running 100:1 is should only take 17sec or so on a cold day to get the primix in the tank.

I use Idemitsu which calls for a 200:1 mix (1/2oz per gallon) so it takes about 10sec for me. Also by running a leaner mix I can get 4 fill ups before I have to add any more premix to the reserve.

The down side is the capacity is kinda small for a 100:1 ratio( only two fill ups)
also if the pump fails your back to the ole' fashion way. And dont forget you have to check look at the premix tank to make sure you pumpin' in enough.

After running the test I think this system will work great. for the guys who want to have more of a reserve run two tanks in series to each other, that will give u 60oz. on hand.

Oh yea I just wanted to know what is the best synthetic material to use for the oil injection lines and the tank seals, I am thinkin Sylicone but i am not sure.

I am going to install it and see if it works and I will keep everyone posted. If this does not work I am going to get me a trunk monkey and have him put the premix in for me

 

I don't think it is complicated at all. I guess it would be for the mechnically challenged. Also I have been using this primitive method for 2 months now and it takes too long and is messy. I have already ruined a nice suit. Oh, yea do you have a link for the OMP from RA

 

I just thought of something, as i was pouring the premix into the sub-zero tank I noticed that the container that the premix was in was also plastic. I know that these containers are only temporary but I have never seen one leak oil. Do they make that plastic with different compounds or something?

 

The fuel pump could constitue as a form of a fitting. This is where I plan to tap into the tank. Drill a 1/4" hole in the top of the fuel pump plate and install a nipple there. That way if I mess up I can just replace it

 

metal reservoir stock OMP with RA adapter mounted in sub zero starting assist location. Simple easy don't complicate things.

 

Does RA kit require a electronically controlled OMP if so I dont have that type of system. I have an 86 s4 n/a and a 87 s4 n/a. Once again what is so complicated about this I just dont get it?

 

Do not use Silicone hose as it will deterriorate from gas/oils unless it is rated for fuel / oil delivery. I would also install a small checkvalve on the line going into the fuel tank. While your filling up, gas vapor is going to want to escape through any line it can (in this case the easiest line. AKA your new line) and will start backfeeding into your premix. Also, another worry is the tank being under pressure while in use, or having a vaccum pressure causing the premix tank to siphon. (Sometimes when you open the gas cap, air rushes into the tank to equalise the pressure in the system)

 

They make an adapter for all types of OMPs.
http://www.rotaryaviation.com/oil_in...p_adaptors.htm

 

Pardon me for being dense.....but I don't see how this can even be close to working right. I must have missed something here.

Let's see. You've this pump and it's pumping into the 16 gallon tank of gasoline. Lets say the 0.34cc's in five minutes the FSM uses as a example for the rate at 2000 rpm for five minues with the rod FULL UP.

Well, you NOT injecting 0.34cc's every five minutes into the rotor chamber. Your injecting that amount to be mixed with 16 gallons of gas and by the time it reaches the injectors ........it ain't near 0.34cc's being injected.

And the amount the lines inject is dependent on rpm and how high the rod is actuated by the throttle lever.

Sorry, ain't a gonna work. Back to the dwg board.

This article is more practical and involves no extra motor and is a good DIY project. https://www.rx7club.com/forum/showth...highlight=PUMP

 

I believe what he is saying is that he can measure the amount he is adding to the gas tank. For example, if he was mixing at 128:1 (1 oz per gal) and he added 12 gallons of gas, he would simply run the pump for 16 seconds, which would add 12 oz of premix. Now that I've thought about it, it actually seems like a pretty good way of doing it. I especially like the idea of mounting the injector in the fuel pump cover so it won't comprimise anything. I say go for it and post how it works.
As for using the sub-zero bottle, I don't really see why it should be a problem, unless there is something I don't know about. I was just planning on using the PS res for mine so it would look stock.

 

I was thinking of using the pump and system as a water injection system hooked up to the megasquirt, or at least as something to spray some water onto the intercooler. The OMP idea is a good one, but the concern i'd have would be with slowly burning out the pump by pushing a heavier fluid thru it... either that or having the oil eat away the seals inside of it.

 

hailers. . . i have no idea what youre talking about

OP: I like the whole not getting your hands dirty/not having a dirty funnel in your car idea, which is why i kept my normal OMP. some people are being ******** in here.

 

FYI, if you premix without the stock OMP, Idemitsu's recommended usage is 128:1 (1 oz per gallon) 256:1 (1/2 oz per gallon) is their recommended usage with the OMP functioning normally.

 

I don't think you understood the OP.

The pump is just introducing oil to the gas tank, just like someone pouring premix into the filler tube. It's just a large tank of premix with a pump and dedicated hose to add oil to the tank. I don't see it being a problem, it's a fine idea - premix is kindof a hassle and messy, not something you can always deal with when you need to fill your gas tank.

Might I also suggest possibly using the washer bottle for the hatch instead of the sub-zero assist tank? It too has a pump, and is made of plastic.

I would just grab one, fill it with premix, loop the hose back into the top - andl eave it running continuously in the garage for a while and see if it fails or starts leaking.

 

Ok, IF that's what is going on, I totally misunderstood what was going on.

 

i think the best part of this idea is when its raining. i hate adding premix when its raining. it takes too long when it rains. and snowing, but i never drive my car in the snow.

 

So, did you do that and how did it turn out???

 

can someone explain to me what the point of running premix is? Do you still have the normal oil and stuff? Are you simply adding 2 cycle oil to the fuel? If so, what gains does this have? What all modifications are needed to the engine to use this method?

 

I think your idea will work, but my point is this:

-You don't want to get the messy 2-cycle oil everywhere whenever you fill up.
-Your solution is to have the pump put the mix in the tank for you.
-You still have to fill up the resevoir for the pump... so you're back where you started: with messy pre-mix everywhere.

I don't mean to be an ***, but maybe you should just work on your pouring skills