|
Certainly a possibility, Charlie
Be interesting to know if they were using synthetic or
mineral 2 stroke
Ed
Sent: Saturday, August 20, 2011 7:24 PM
Subject: [FlyRotary] Re: High Octane - less BTU [FlyRotary] Re: Fwd:
oil premix data; info request
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
|