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I'm aware of the octane issue, but this was displacing fuel with
2stroke oil, and as is well known by now, a lot of the premix oil
isn't actually burned. Kinda makes you wonder if they were running
too rich, prior to adding the oil to the gas.
On 08/19/2011 09:05 AM, Ed Anderson wrote:
Hi Charlie,
It makes sense that this
would be the case. Assuming they are using non-syntechic 2
cycle oil the oil carries more BTU than the highly refined
gasoline. As you know higher Octane gasoline does not produce
more power - it’s the fact that higher octane delays the onset
of detonation which permits higher compression which results
in more power. Higher octane gasoline has fewer BTU than
lower octane - all else being the same.
A high octane fuel, such as liquefied
petroleum gas (LPG), has a lower
energy content than lower octane gasoline,
resulting in an overall lower power output at the regular
compression ratio of an engine run at on gasoline. However, with
an engine tuned to
the use of LPG
(i.e. via higher compression ratios, such as 12:1 instead of
8:1), this lower power output can be overcome. This is because
higher-octane fuels allow for a higher compression
ratio
Ed
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