and acordng to alex graham bell for every 10% more comp you can get 4% more power on a 2 stroke... so raise comp 50% to 10:1 = 20% more power =13 hp
the hard part would to get 3 plugs go off at exactly the same time
Researchers have found that it is the gases at the very outer limits of the
combustion chamber, called the 'end gases', that self-ignite to cause detonation. These
end gases are heated by the surrounding metal of the piston crown and combustion
chamber, and also by the heat radiating from the advancing spark-ignited flame. If the
spark flame reaches the outer edges of the combustion chamber quickly enough, these
end gases will not have time to heat up sufficiently to self-ignite and precipitate
detonation. Herein lies the key to prevent detonation — keep the end gases cool and
reduce the time required for the combustion flame to reach the end gases.
Rapid combustion has other advantages besides controlling detonation. With an
increase in combustion speed there is, of necessity, a corresponding decrease in spark
advance. The closer to TDC we can ignite the charge, the less negative work we have to
do compressing a burning charge that is endeavouring to expand. Also there is less
energy loss in the form of heat being transferred to the cylinder head and piston crown.
Heat is the enemy of two-stroke engines and stretching the compression ratio to
give a 10% power increase will possibly result in a 3% power rise at the most; the rest
will be lost in heat energy and pumping losses. However, at lower engine speeds the
cylinder will not be completely filled with fuel/air mixture and the power may jump by
5-6% because there is not such a heat loss. This is, in fact, the real benefit of raising the
compression ratio, not to increase maximum power but to pick up mid-range power
and possibly widen the power band.
heres my (kinda) idea to have 3 spark plugs go off at the same time so the flame front has 50% less distance to travel and bump the compression 50% = 13 extra horsepower no mileage loss and happy with 91 octane
this has been used on zabel 685cc 2 strokes but with 2 plugs in 1 bowl
the zabel has its comp published @ 11:1 but I think thats uncorected , corected it would be 5.86:1
stock the flamefront has to travel 1" my idea is to have the ff travel .666" (50% less)so i can raise comp 50%
blue is squish band
green is "bowl"
orange are spark plugs
does anyone have a 10:1 comp cr 500 whats it like does it gain power
if this really works and somone makes money off it they owe me 2 of them
[/img]
