Post by z28guysteve on Oct 4, 2021 19:42:28 GMT -5
Upon completion of my JM50 I have not been able to make the engine sustain on liquid fuel without becoming extremely hot. The flame front will not stay in the primary zone no matter how slowly I try to meter liquid fuels. I can get a mildly hot sustaining idle on gaseous propane, but liquid propane too will run too hot.
I'm not able to form a proper recirculation zone in the basket. I have not yet had a chance to install anything to measure case pressure.
Post by z28guysteve on Oct 4, 2021 19:49:11 GMT -5
The inner and outer basket sleeves are seen aligned on their rear edges. This is exactly how they sit in relation to one another in the assembled engine.
The vapor tubes are straight and vertical, they align with the peripheral edge of the basket. Which to me, I would think may be discouraging the formation of a toroidal vortex, the inner liner has more holes, and higher holes than the outer basket, so I would think that should encourage flow to travel outward at the top of the primary zone, and inward on the bottom of the primary zone, yet the vapor tubes being on the periphery of the basket would directly oppose this flow.
I think maybe I need to bend and aim my vapor tubes to aim more centrally and add some tubular stainless vortex jets?
May I suggest you start to measure a few parameters , like RPM , compressor disharge pressure , and thrust .
If this is your first build then you have no idea what to expect .
You state that you can get sustain on gaseous fuel , the switch to liquid fuel will increase your fueling by several times , you could very likely be overspeeding the engine on liquid propane being supplied at high pressure .
DO NOT START THE ENGINE UNTIL YOU KNOW MORE ABOUT WHATS REQUIRED , IF IT EXPLODES YOU COULD BE KILLED
Post by dieselguy86 on Oct 7, 2021 20:03:46 GMT -5
The diffuser is definitely crappy. The point next to the compressor wheel should be a sharp point, the pics I seen on their site shows a very blunt point. Also in your video, do you have any oil going to your bearings?