Thanks Max,

Excellent information from one of the best sources of diesel engines around. I agree with everything except where it comes to the issue of idling. Both diesel and glow engines can be made to run at clean, lean settings that are not overlean but give you the max power out of your engine and fuel. A clean exhaust doesn't mean the engine is TOO lean. It COULD mean that the mixture is optimized for best power and fuel economy. No need to set ANY engine on any rich side with smoke pouring out. A properly set engine will certainly display an exhaust trail but in no way should it give you a smoke trail,,, unless that's what you want. Or you have WAY to much oil in your fuel. Something diesel fuels appear to have.

Setting an engine on the rich side to compensate for some other inadequacy will nearly certainly give you problems if trying to set the mixture at idle. If your main needle is clearly rich, this may take the idle adjustment out of the range that it's capable of coping with. In other words, way more fuel is being delivered at idle than the idle adjustment can handle.

I've added adjustable airbleed throttles to side port Mills diesels and once adjusted, throttling was virtually perfect,,, idle all day and instant response with no EXCESSIVE smoke, spitting or hesitation. I've also added the adjustable airbleed to stock PAW .061s and while throttling wasn't perfect, it was much improved over the stock arrangement.

Hobbsy,

If you've got a PAW, single needle throttle that you'd like to have an adjustable airbleed added, I'd be happy to do it for you for free. I'll even pay the postage back. It worked for me twice and I'd like to replicate the experiment and have it evaluated by a knowledgeable third party.

Luftman,

If some of the more knowledgeable folks in this forum can advise, what size glow throttle might suit the .35 diesel and depending on that, I'd be happy to supply you with a throttle to suit your .35 that has a means to adjust the idle mixture. It may provide dramatic improvement or only modest improvement but I anticipate that it will at least give you SOME improvement over stock. I'd be more than happy to do this for free just to prove me wrong,,, all in the interest of a good and worthwhile experiment and confirmation by a third party. Send me a PM with the dimensions of the PAW stem and your address. Again, no charge or obligation, I'll pay the freight back.