Help Required with t58 (RR Gnome)
I’ve run the engine several times now with very mixed results.
I've run it up on the starter for about 25-30seconds until engine speed levels out, began ignition a few seconds before switching the fuel cock to on and then held until light up, the engine then starts to increase speed.
It runs very clean once it’s up to about 14500 but its not so good starting from cold. I’m not sure what may be a miss but I get a lot of yellow flame and heat.
I can only assume the yellow flame is caused by over fuelling and the heat because of the low volume of air flow (hot start). I’ve also seen small sparks and got ticking noises from the turbine stages.
As a precaution I removed both turbines, cleaned up any marks on the blade tips and shrouds and have rebuilt them, as luck would have it very little needed to be done.
My question to anyone that can help is, What can be done to adjust the excess fuel during start up. I have documents that cover engine parts but none on set-up???
Kind Regards