Priming and oil Pump out put.

[Willgo]

I have nearly completed the assembly of the engine of my GT380J.
But I am concerned as to whether I have sufficient oil supply from the pump never having worked on one of these before.
After reading the manual, I thought I primed the system by running the pump/tacho drive shaft from a drill.
It runs at an indicated 2000rpm on the bikes tacho.
I have primed the oil lines from the pump with a pressure oil can and oil runs out at the unions. Bled the oil supply line at the bleed screw on the pump.
Running the pump with its regulator at max (the arm anti clock till the last dot lines up with the scribe mark) all I get out of the unions (they are not connected to the crankcase) is protracted drip on the cylinder unions and a slower drip from the unions for the mains the right hand mains union looks slower than the rest.
Is this the normal sort of supply? I have tried it with a spare pump and not much difference.
The engine is on the bench.
Thanks for any help
Bill Dag.

[racerd14666]

that sounds like your pump is fine, i remember reading in the service manual that the main bearings have a fixed output, and the cylinders get a bit more but it still runs some were around the 20:1-50:1 ratio range from the amount of smoke the 380 i built threw off

[Suzsmokeyallan]

Its easiest to use two different coloured oils for testing the pumps output. Fill and bleed the lines up to the CCI tank hose with one colour of oil. Then fill a portion of the CCI tank, OR a use a large syringes lower body held upright in position by a strap connected to the hose with the other colour of oil.
Even at 2000 engine rpms and with the pump lever held open at max output, you will only see the coloured lines where the two oils meet moving forwards slowly in 'steps' within each oil line.
Its not a constant forward oil flow, nor is it much either, watch all the lines for even flow, that is, the intake tract outputs need to match each others flow rate, and the crank main ones need to match each others flow rate.
You'll need to get the engine in the bike to complete the setup and have it running to test the pumps actual performance.

[Willgo]

Thanks for the advice. The trouble for me trying to look at the flow though the pipes from the pump is they’re coloured red, as was the old tank to pump supply house, If that is not the norm they must have been dyed by whatever oil was being used. They’re nice and flexy though.
That makes it difficult to see any oil let alone two different colours. I can see what you mean re the flows needing to be the same respective to cylinder and mains, as I said the left hand mains does not seem to have as large a discharge as the other two and there is a noticeable difference between the cylinders and mains.
Thanks Bill

[Willgo]

Thanks once agene for the help. I now realise just how little the amount of oil is pumped.
What I did in the end was to put some nuts on the banjo bolts so the oil would have to exit vi the drilling.
I took the RPM as shown on the tacho to 4000rpm, as be for driving the cross shaft and could just make out the air bubble move. I kept it up tell I could see the slight pulse of oil at the banjo bolts of the mains. Reconnected and run it agene for a few minutes to push oil down to the bearings.
I wouldn’t have like to have run the engine for the time it took to move the air out and get an oil flow.
If I ever do it agene I will use the drill on the cross shaft.
Thanks agene Bill