Barnhart wrote:

Leon mentioned the ratio between compression and octane.  How do you determine it?  How will a turbo affect octane requirements?

Is auto fuel different in Oz than here?

Barny

Mazda did extensive studies on this subject and basically you are wasting your
time going over 9.2:1. There was no HP increase over 6,000 RPM and only a very
slight increase below that with 10:1 compression ratio. The BSFC improvement 
was difficult to measure. My scanner is down or I would show you the charts out 
of Yamamoto's 1983 book "Rotary Engine" page 48 and 49.
The rotary appears to be different than the piston engine in how it
responds to compression ratio increases. This is probably because the
combustion chamber shape gets much worse as you increase the compression ratio.

The octane requirements are almost a straight line between 84 research octane
9:1 CR and 96 research octane at 10.5:1. 

I personally and definitely under no circumstances would try it with a turbo. 
One would risk detonation and apex seal fracture.

I may have a chart already scanned from the book in my computer someplace but I 
cannot find it at the moment.

More power to Leon on this as he can afford to blow up an engine or two.
I look forward to what he finds out using a turbo.

Paul Lamar

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