Before I go ahead with the report about R&D work here I have to own up to an another boo-boo, discovered in the centrifugal pump.
At the beginning of this session, I have mentioned, that the pump was blocked after long time at the shelf.
I have found the flow diagram at my collected Snow date file and looking at it, there should be some reasonable flow at 800 to 900 rev/min available.
This pump was build end/beginning of 2014/2015.
After that I have build another batch of 3.
One is working together with my Opposed Piston Twin without any issues.
Also the Bruce Macbeth engine cooling is done with this pump.
During all my R&D work there in the last two month, there was nothing conspicuous.
So the decision was done to take the pump of and have a look at it.
When I looked into it, from the surge pipe, I have been irritated by seen the shape of the shaft in full format already.
So after taking the cover of, I could see the entire mess.
There was a part oft the shaft, covering the intake by nearly 80%.
It seems, that I have forgotten to short it down, close to the brass center disc of the impeller.
At the very beginning of the life of this pump in 2015, I have made some experiment with water in it, to get an feeling about the flow.
So it was turned in a test set up and I wanted to know if there is a reasonable flow at 1000 rev/min visible.
It looks like, that from this experiment there have been some rest of water in the pump for a longer time.
I do not have any other explanation for the visible corrosion.
I am still having no explanation for the corrosion at the gasket surface, because there should have never been any water contact.
A new gasket was available and the pump could get its way back to the engine again.
The next long run was archived easily. Over all I do have 180 minutes of run time in the records now.
The coolant flow is much better now. I can measure the coolant, water jacket of cylinder #1 and #2 (outside in the middle with IR/Laser thermometer) nearly the same temperature at all running conditions.
If the coolant and cylinder are heated up to 75°C than the outer heads are heated up to 98° C and coolant starts cooking.
This does happen after 30 Minutes ongoing run time.
Conclusion: For me this is more success I have ever thought to archive with this engine build.
It is not an easy model engine to build and I have heard of several people, who never get it running so far.
So I am very happy with the status as it is now.
The last prepared fuel mixture is burned and after some cleaning I have put it back under the acrylic cover at the shelf.
Thanks for watching and following along.