503 Oil Injection Thoughts

[Hardy]

It works great! 300 hours and no problems.

 

[Redbaron]

Back in the good old Mac days I used to carry oil bungee wrapped to the bow sprit when flying cross country and expected to re-fuel.

Got any pictures pete, or were cameras not invented yet? :boink:

 

[CLS447]

Hey guys, thanks for the thoughts but.......does anyone know the answer to the question......can the oil pass from the tank & through the pump & through the tubes to the manifold via gravity ???

Ron, I have a CLT kit for my machine but I like her the way she is.

BTW.....my new girlfriend, Angela , just left my place. God, she is great !!!!!!!
She bought me some egg salad & her home made vegetable soup. She is really nice & I hope you all get to meet her someday. I will post pics when I get some.

Shar stole my AOL account & will not even speak to me. She let me go !

So my new email [email protected] so shoot me an email so I can start restocking my address book. Phone #s are good too !

CLS503 upside-down & oil injected!!!!!!!!

 

[GyroRon]

I suppose that works if you have room for it. I know there is a lot of "oldsters" who don't trust oil injections systems, mostly the same sort of people who eye suspiciously new-fangeled things like digital cameras and cell phones and such.
But I would figure someone with you experience in the world of dirtbikes would see that they work just fine.
Ben S

My dirtbikes don't have oil injection, you have to premix. My first dirtbike DID have oil injection, and it failed and it ruined the engine. I was 10 or 11 years old at the time....

I just prefer to mix my own oil, nothing to fail that way, no issues to resolve, no hassles. Cleaner installation, less clutter and weight on the machine, simpler. Any machine out there can have a bottle of oil duct taped to the keel if needed.

 

[Redbaron]

I had an old yamaha rt100 playbike with oil injection that never failed! doesn't mean it can't fail! I like the kiss method myself "keep it simple stupid". Especially when flying i like to keep it simple!

My dirtbikes don't have oil injection, you have to premix. My first dirtbike DID have oil injection, and it failed and it ruined the engine. I was 10 or 11 years old at the time....

I just prefer to mix my own oil, nothing to fail that way, no issues to resolve, no hassles. Cleaner installation, less clutter and weight on the machine, simpler. Any machine out there can have a bottle of oil duct taped to the keel if needed.

 

[GYRO J]

I agree with Ron a 2 stroke engine will last much longer if you properly pre mix the fuel yourself ive seen 2 many jetskis and dirt bikes with damaged pistons from oil starvation , oil injection either puts in too much oil or not enough think about it that oil injector doesent know how thick the oil is(when its cold) or how thin the oil is (when its warm)
so it gives too much or not enough if you premix and keep it fresh it will run better and last much longer!

 

[Earthboundmisft]

Nuff Said. Horse startin to smell...

 

[scottessex]

Here is what they say:
https://www.rotaxservice.com/rotax_tips/rotax_oil_injection.htm

 

[Edypaul]

Hey guys, thanks for the thoughts but.......does anyone know the answer to the question......can the oil pass from the tank & through the pump & through the tubes to the manifold via gravity ???

Yes it will flow to the intake by gravity. Thats WHY there are two each check valves in the banjo fittings at the oil pump . if you install a valve in line with the oil line(because you have a bad check valve) the oil will flow into the engine below the valve and be replaced with air close to the manifold in the oil line. When you start your engine you will be pumping air instead of oil. Do not install a valve. REPLACE THE BAD CHECK VALVE.

 

[CLS447]

OK.......Check valves allow flow in one direction. I would have to believe that they only allow the oil to flow towards the intakes, Right ?

Are they spring loaded checks that require pressure from the pump to allow the oil to move ?

Do you believe that if you "put your thumb on the end of the straw" you will still get gravity flow through those tiny little hoses ? Thereby getting replaced by air ?

This would be fairly easy to prove by examining all of the see- through hoses all the way to the intake.

Do you believe that I have at least one bad check valve ALREADY ?

Is this common for these to go bad ?

I have never heard of this problem before .

I will be calling the Rotax centers & looking up parts such as this Banjo check valve.

Are they expensive ? Thanks

 

[Edypaul]

Yes they only allow flow toward the intake.They are spring loaded and they do go bad. If the check valve is bad the oil will seep when the engine is not running. The problem with using a shut of valve between the oil tank and the pump is that when it is shut off you have one to two feet of oil line and the pump under the shut off valve. some of the oil in the lines will end up leaking down in to the intake possibly from expansion and contraction. as the oil leaks into the intake manifold it is replaced with air. the oil line to the manifold is small and I have seen 3/4 to 1 inch bubbles of air in those lines with an engine that used a shutoff valve . the amount of oil injected into the intake is small.if you watch the oil moving down the tube to the intake when the engine is running you will see it only moves about 1/8 of an inch every 5 to 10 seconds. If you have an air bubble in the line that is 1 inch long it will take a while to purge the air. That means your engine is not receiving any oil.The check valve on the other hand is very close to the manifold .When the engine is not running the oil will stay put because of the small diameter of the oil line.

 

[CLS447]

Some pictures of my injection system

Some pictures of my injection system

Here are some pics of the way my system is installed.