ETLB Squawk Forums — Archive

Hi everyone.

Does anybody have any experience fitting an Oil Injection Pump to their Rotax 447/503?

I'm looking to fit one but need to replace the Intake Sockets for ones that will allow tube connection to the pump.

As per the photo, Has any one drilled and tapped the standard sockets at point 2?

What is the purpose of the connection point, 1? Thought that you could maybe connect the pump outlets there.

Cheers, Mick

I realize that the convenience of not having to premix your fuel sounds attractive. I for one have never felt comfortable using one. A plugged or damaged feed line or vacuum line can spell big trouble. You first indication of it not working will be when the temps rise and/or the engine seizes. Its just not that much trouble to premix my fuel. I tend to use 100LL fuel so I also have to add a supplement to handle the lead so I am doing some premix anyway.
Joe

FYI:
Check out this link:
https://rotaxrick.wordpress.com/fuel/

Joe

As far as I'm aware connection 1 on the side of the carburettor is there to allow you to connect a set of vacuum powered carb balancers.

Quoted from joe.scalet I realize that the convenience of not having to premix your fuel sounds attractive. I for one have never felt comfortable using one. A plugged or damaged feed line or vacuum line can spell big trouble. You first indication of it not working will be when the temps rise and/or the engine seizes. Its just not that much trouble to premix my fuel. I tend to use 100LL fuel so I also have to add a supplement to handle the lead so I am doing some premix anyway.
Joe

Thanks Joe. There is a wide variety of opinions on the use of the oil pump with both sides having good arguments. My main reason for wanting to fitt one is to not have to worry about premix on x country trips. There's plenty of places to get fuel but the logistics to premix at different places is not easy. I'm still in 2 minds though.

Quoted from bob.hood As far as I'm aware connection 1 on the side of the carburettor is there to allow you to connect a set of vacuum powered carb balancers.

Thanks Bob. It's also the Primer Port from what I've been told but has only a very small orifice into the carby so no good for fitting the oil injection lines to.

Cheers, Mick

Before you go to the expense and trouble of setting up oil injection, talk to Paul aka AirBikeace. He has probably spent more time flying cross country than anyone else on the site. He lives outside of Wichita Kansas and has made several trips to Oshkosh and to Sun N Fun. I'm not sure if he uses oil injection, but he would  be the person to talk to.

Quoted from Mickvds There's plenty of places to get fuel but the logistics to premix at different places is not easy.

If you are going cross-country you will need oil, whether for the oil tank or for pre-mixing.

You could carry a small wide-mouthed plasic drinks bottle which will accept the fuelling nozzle, after the correct amount of oil has been added to it for the total fuel uplift, and then add that heavy mix to the tank. That's what I do.

Or you could carry a 2 litre burger-stand plunger ketchup dispenser which has been checked for its delivery volume per squirt, and squirt the necessary number of squirts of oil from it directly into the tank prior to fuelling. That's what I do.

Oil injection is more oil-efficient but in my opinion adds un-necessary installation complication.