I've tried to add you tube video... but I give up...its on there ...nitro/petrol mix with igniter
I've tried to add you tube video... but I give up...its on there ...nitro/petrol mix with igniter
i
Sort of fires but my fuel delivery system is crap !! It also doesn't want to know at all without the igniter battery..
Hi Nigel,
Great to see that you are still doing crazy, innovative and inspiring stuff, hope you get there mate, can`t wait for a new `Midlands`, perhaps next year.
Regards, Trevor
We did some testing with a 26 cc racing engine on glow ignition. We couldn't get the plugs to hold up. The plugs that could stand the pressure wouldn't constantly fire and the others blew out the center element. We probably needed to play with head volumes. On spark ignition it ran well on 15% nitro model fuel, but burned the electrodes off the plug on 40% nitro. I wrote an article on model engine head design. See namba.com/content/library/propwash/2019/october/4/#zoom=z if that helps.
Model "diesels" depend on a close fit with the moveable head and the cylinder. They're adjusted by a central screw. I'm not sure how well that would work on a larger bore. Our luck with this style piston on a 36 cc engine wasn't good. The head is a less exacting application, though. It needs to be very close to a zero clearance fit in a very round bore.
Lohring Miller
thanks, ill take a look at the article.. i had hoped my original piston ring sealing method would be the way to go and maybe i should have another go at it but improve my machining... or even try and press in a pre plated sleeve with an opposing modified piston. at least that wouldn't need me to up my game on the machining front.
Last edited by breezy; 4th March 2021 at 06:29. Reason: attachment didint load
That glow plug has the idle bar fitted to it. You need to try one without it. Also there is flat coil glow plugs that work well in 4stroke engines. Ontop of that they come in different heat ranges too, and different alloy compositions.
Neil
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