I was looking for a cost-effective way to replace the old, brittle, OMP lines. I went to the local motorcycle shop and purchased the smallest fuel hose that they sell. It's blue in color and and you can see through it. Anyway, it fits so snug on the injector that I didn't even need to use any clamps. So far, no leaks, and I can clearly see the oil working its way through the lines. It cost me $1 per foot. I'm going to put some wire loom over the lines to protect them from heat. I just thought I would pass this on :-)

Mike

 

Good info. I'll have to look into this...

 

Were the OMP line, when original, a harder line?

I know its not a high pressure system, but if the originals were hard (then became brittle), I would have reservations about using a soft fuel hose for it. I would also consider clamps as a precation as well, because one of those falls off and you just toasted half your engine. I personally run premix, but thats my thoughts.

 

If it works then awesome but definitely use the clamps. You can never be too careful.

 

the white tubing is fairly hard, although flexible when its new. the ends are soft.

the only consideration for a flexible line is to make sure its not rubbing anywhere, or could get caught in a belt or something. even though its simple i have seen even the stockers misrouted to the point where they are sitting on headers and stuff.

 

The problem is your oil is gonna be hot and fuel lines are not hot like that.

What's the temp rating for the fuel line?

 

i did something similar except i was in wal-mart at the fish tank section and grabbed some of the medium? (very easy to tell which one you'll need) line it was like 2 bucks for about 8 feet lol, i've had it for about 8 months (daily driver) just make sure it doesn't touch the exhaust or make constant contact with the engine and you should be fine, i don't have clamps it does an awesome job of sealing itself and its very tight fit, but if i see any leak come at the ends that's the first thing that's going on there lol. the good thing about this is that it's a cheap alternative and you can see the oil running very clearly. plus i suppose you can use the extra tubing for cool/clear vacuum hoses lol.

 

The original OMP lines are very small diameter inside, as I recall. Much smaller than the barbs on the OMP or carb. That's probably to insure that if the lines drain down when the engine is not run for a time (and they do, though slowly), they refill and flow quickly after starting.

If line diameter is too large, then the overall volume of the line that has to be filled before any 'comes out the top' will cause a long delay between engine start and first oil delivery. The pump doesn't pump much, less than a ml over several minutes, I think. If your lines have a volume of a few CCs total, thats many minutes of running with no oil to the rotors, each time it's been stopped long enough to bleed down.

Thinner lines also resist bleed-down, since the small amount of oil has ilttle mass relative to it's viscosity & surface area.

 

You all have legit concerns. I guess time will tell if it was a good mod or not. All I can say is the the inside diameter of this hose is pretty close to stock and it is such a snug fit that a clamp would not do anything. As a matter of fact, once the hose is on, you can even pull it off without some help with a screwdriver. If you route the hoses through the clamps where the stock lines are, there is nothing that it can touch.

Mike

 

Weed Eater gas hose is said to work

Or there is a post on an external MOP tank that had a source for silicon tube

Or there is always McMaster-Carr

 

I used some small surgical grade sillicon hose
cost me like $15 for 3m
exactly the same dia as std OPM hose
its almost clear/slightly opaque, can see the oil
is resistant to high temp, and is extremely flexible
it fits snugly over the nipples but i used the smallest black cable/zip ties
to make sure they dont come loose and also tied the lines together
simmilar to ign wire plastic clips so its neat and wont foul or touch anything
been on for almost 2 years now its perfect!!!!!!

 

Sounds good. I love it when people think creatively :-)

 

https://www.rx7club.com/showthread.p...tor+resistance

Rebuilding the OMP oil injection lines

found that on a search. it'll help

 

Where can I get the surgical grade hose? I have stock lines with rubber hose extensions to get them to reach the sidedraft carb. Since the rubber extensions are thicker then the originals, they take a long time to fill up prior to delivering the oil. I am running pre-mix until I repair these, maybe afterward, too, since the actuator linkage is tied off in a fixed position.

 

Check out this link. These hoses are used in hospital and the heat range is -120 to 500 degrees F. I think it's 1/8". Just make sure that the inside diameter of this hose will fit real tight on the injector nipple.


http://pep-plastic.com/manufacturers...e/slbrdmdx.htm

Mike

 

BTW---I did not buy my hose from this company, so I have no idea how much it costs. There is a 1-800 number to call to find out the details on the web page.

 

Teflon would be the right stuff.

 

Thanks for the help. Dave

 

sorry cant tell u the exact spec of the stuff but i just went into a couple of rubber/sillicone hose suppliers/wholesalers and busted the chops of the bloke on the counter and scored this stuff