See full version: TWO STROKE AUTOLUBE OIL PUMPS
¶ In the old days, two stroke engines used a fuel mixture of gas and oil called Pre-Mix. This worked fine at high speeds but at low speeds there was too much oil. This caused problems like fouled spark plugs and plugged mufflers.
The two stroke manufacturers came up with a great cure. Injection oil pumps. These pumps add just the right amount of oil for whatever RPM the engine is running. The oil was stored in a Oil Vessel, also known as an Oil Tank. Depending on how hard you ran the engine, the oil could last through several tanks of gas. No more pre-mixing your oil and gas.
At an idle the pump mixes the oil with the gas from a 120 to 1 ratio on up to 20 to 1 ratio at 8000 or more RPM. These pumps worked great and really helped the oiling problems of two strokes. Two strokes now fouled their spark plugs less, didn't carbon up their mufflers as much and saved money by using less oil.
There is a bleeder screw on the injector pump; you need to open that until oil starts pouring out, then close it up. here
ohh okie like my Honda Spree. I usually just mix the gas and oil together instead of pouring it into two different tanks. usually because you never know when the oil injection tank might fail while your riding.
There is a procedure for testing the pump's output too; it requires a bottle of premix to temporarily run to the carb while you run the engine with the injector hose off of the carb and placed in a graduated cylinder. After 5 minutes at 3000 rpm you should have about 1 ml of oil in the catch.
Thanks for that piece of advice, BOAH. I was going to add some oil to the fuel for my hose testing but I'll go ahead and make it 50:1. This motor could probably use a little extra oil anyway.
When I replace the oil in the tanks, do I need to do some type of prime of the system before startup? here
There is no need for any type of flow sensor being the system is so dependable. Rare for the pump to fail as long as oil is in the tank.
Re: How do you know if oil injection system is working correctly?
When you're doing a cold engine start, look for a smoke screen after the engine starts. That'll tell you the engine is getting oil.
Re: How do you know if oil injection system is working correctly?
DOMINANT PHYSICS & DESIGN:
Table 1: Variable Descriptions, Values and Units
This volume is then multiplied by the density of the fluid and by the g to find the weight of the column of fluid the pump must lift.
Two things must be noted. First, the above analysis is very rough and does not include additional factors such as impulse forces. For more detail, see Reference 1, page 9.283. Also, the forces described above vary with time and this must be taken into account. more