Talk:Carbureted compression ignition model engine: Difference between revisions

Revision as of 20:47, 5 July 2012

Revision as of 11:25, 28 April 2014

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Who makes these? Some examples and external links would be good. <span style="font-size: smaller;" class="autosigned">—Preceding [[Wikipedia:Signatures|unsigned]] comment added by [[Special:Contributions/96.60.12.110|96.60.12.110]] ([[User talk:96.60.12.110|talk]]) 06:20, 11 October 2010 (UTC)</span><!-- Template:UnsignedIP --> <!--Autosigned by SineBot-->

== Further explanation needed ==

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).

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