>>> How would one go about Raising a rotary's compression ratio?
>>>
>>> For the same compression ratio as a piston engine does a rotary engine
>>> require more, less or equal octane?
>>> Thanks,
>>> Brent Hasty
>>
>>
>>
>>> Requires changing the depression depth in the rotor flanks.
>>>
>>> Paul Lamar ...No rotor no motor.
>>
>>
>> I can see it would be easy to lower compression by removing
material, to
>> raise
>> you would have to fill in the depression, typically how? with weld?
>>
>> Thanks,
>> Brent Hasty
>>
>> You might try screwing in a curved steel plate.
>> Or braze it in.
>>
>>
>> Paul Lamar ...No rotor no motor.
>
> Paul,
> That could be a bit risky - might try the RX8 10:1 rotor with 3mm apex
> seals! Which is what I'm using on the single development.
>
> George ( down under)
>
> The RX8 rotors are having cracking problems. I don't know if Mazda
> fixed it yet.
>
> --
> Paul Lamar ...No rotor no motor.

NOW you tell me!!

George ( down under)

----------------------------------
So are we now saying that stock RX-8 engines have
problems with cracking on the rotors?

Or has this only an off chance, and that this has
shown up in the cars under certain circumstances

That concerns me as I have I have 2 of these targeted
for aircraft use. one 6 port and a 4 port.

Regards David

It is showing up in Star Mazda spec formula road racing racing.
Usually the rotary engines last up to three 10 race season. It is
happening after several races. The red line is 8500 RPM.  Most of
the time is spent near red line. Piston engines under  the same
circumstances last as little as one race and maybe three or four
races at the outside. The fix is minor for Mazda. Merely a small
change to the rotor casting patterns. The crack happens at a machined
notch that locates the rotor bearing shell.

Paul Lamar ...No rotor no motor.

The Rotary Engine NewsLetter. Powered by Linux.
ACRE NL web site. http://www.rotaryeng.net
Copyright 1998-2006 All world wide rights reserved.