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Thread: How do you adjust engine timing on nitro engines?
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Old 02-02-2011 | 10:42 AM
  #196  
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wingracer
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Originally Posted by Chickentrader
Very interesting; a couple of matters that I would like to learn more about:

1. Which areas should be roughened up with sandpaper for better flowspeed?
2. What is pumping effect of the crankcase?
3. Do you have a download link to the book that reloaf has recommended?

Any advice of would be greatly appreciated.

Kindest regards,
Lars.
Pumping effect: basically on a two stroke, the crankcase acts like a fuel pump and since the air is involved too, sort of like a supercharger as well. The higher the compression ratio in the case, the more the effect though higher ratios also mean less volume so you lose on volumetric efficiency so around 1.5 to 1 seems to be the magic number.

The link:

http://edj.net/2stroke/jennings/
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