Played with Davis conversions and one or two purpose built diesels. Even successfully machined my own conversions. Carbon build up happens its a property of burning kero and lube. My wife hated the smell even when I tried the scented lamp kero. Had to keep them in the shed out back as the garage was attached to house and any hint of smell look out.
Moved to bigger models and sold all my stuff to a die hard diesel nut. It was another interesting facet of modelling I'm glad I tried it but to keep peace in the family I had to give them up.
I used Easy Off oven cleaner on warm parts then scrubbed them clean. You can't leave the oven cleaner on for more than 10/15 min or it starts to etch the aluminium. I would clean the ring grove with an old broken ring.
Converted a few OS FP engines with no ring and had less carbon build up.
All my conversions were older, well used engines I didn't care to much about.
Dennis
Last edited by Propworn; 08-13-2017 at 06:43 AM.