Engine Cooling Runner Diversion Duct Glassing

Here you can see we’ve added angled ducts to the sides of my NACA runners. I hope to do two things here, well, maybe three. I don’t want to suck rain (1) into the engine, so I was moving to the side discharge. I would also like to get better ram air flow (2) into […]

New Engine Cooling Plenum

So, we’re building this new cooling plenum. My engine always cooled fine, but I had issues with the runner to NACA junction and the plenum was a little fragile the way I had cut the built the runner-to-plenum junctions. I also wasn’t very happy with the wire grommet or spark plug and oil filler access. […]

New Engine Cooling Plenum – Rear Extension

Here you can see we’ve extended the cooling plenum onto the engine. You can see we’ve used my buddy Andy’s trick of waxing the engine so the glass doesn’t stick. Andy has gone to a bunch more effort to seal off his engine, but since we didn’t have cooling issues before, and we expect our […]

Engine Air Cleaner – Round

Obsolete: We are currently running without an air filter as it restricted engine RPM. We’ve decided to redo our engine air system and include a air filter, though it isn’t specifically called for in the manaul. Along the way I’m adding side diverging exits from the NACA ducts, and redoing our cooling plenum to allow for […]

Flow Balance Testing of Fuel Injectors

Here is something else we ran into. After having trouble building RPM and having a very rough running engine that seemed to want to run very lean, and ran relatively well at idle, but not at WOT. We tested the fuel flow from the injectors and found the below. Very uneven flow. After removing the […]

Mounting Catto Propeller

We’ve begun to fit the prop and spinner. We have to put the propeller on and take it off several times to get the spinner installed. First we have to mark where the blades intersect the spinner bulkhead, and then make templates of the blade so we can cut the openings for the blades to stick […]