Talk:Carbureted compression ignition model engine

does not belong n "diesel engines"" transfer to model engines?Wdl24.146.23.84 (talk) 04:38, 2 November 2008 (UTC)[reply]

Who makes these? Some examples and external links would be good. —Preceding unsigned comment added by 96.60.12.110 (talk) 06:20, 11 October 2010 (UTC)[reply]

Further explanation needed[edit]

These two sentences need more explaining: "Larger propellers give a longer combustion time and so higher compression. Smaller propellers reduce the load, and therefore the compression pressure build up, which changes the ignition timing to earlier."

For example, how does this earlier ignition timing occur as a consequence of reduced “compression pressure build up” (and there’s just got to be a tautology in there somewhere)? Also, and perhaps slightly pedantically, if the ignition timing is “earlier” with a smaller propeller, then the combustion time will be longer. However, that property of longer combustion time is clearly claimed for a larger propeller. Yes, it must mean "at a greater angle relative to TDC" rather than “at an earlier time”, so the higher angular velocity implied by the smaller load will more than compensate, and actually give a reduced combustion time. But the use of the term “ignition timing” is liable to confuse that meaning too much for my taste.

Anyway, it just totally fails to get the point across to me, and I think these two sentences need expanding or the point properly referenced (neither of which I can manage) or they should just go (which I could, and may do if neither of the other two options is possible).

Graham.Fountain | Talk 11:25, 28 April 2014 (UTC)[reply]

Further explanation needed: Diesel head "conversions"[edit]

There are some examples of cylinder heads equipped with a contra-piston to adjust the compression, meant to replace the original glow-plug heads in order to "convert" glow-plug engines to diesel operation, but as rightly pointed out in the article, the diesel engines require and need a substantially heavier, stronger construction to withstand the much larger stresses. The crank pin and the connecting rod are the first points to fail. Even when compression could in theory be lowered somewhat to avoid overstressing the converted engine, adjustment range will be too narrow and require careful fuel formulation to be modified in order to work properly. — Preceding unsigned comment added by 192.100.180.225 (talk) 14:47, 10 October 2014 (UTC)[reply]

Further explanation needed: engine deto-knocking[edit]

Why these engines do not suffer from detonation knocking? If things are that simple, we don't need diesel at all. But we do need it, so things are not that simple.128.71.75.187 (talk) 18:43, 25 March 2019 (UTC)[reply]