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Date: Sun, 08 May 2005 12:02:26 -0400
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From: John Huft <aflyer@lazy8.net>
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Subject: Re: [LML] Re: Plasma III on Hi Compression Engines - Firewall Install
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Professor Braly, where WOULD you be comfortable setting baseline timing 
on such an engine?

John Huft


Marvin Kaye wrote:

> Posted for "George Braly" <gwbraly@gami.com>:
>
>  Craig,
>  
>  Having done a full blown  FAA  type certificate block engine run one 
> of these
> engines  - - -   with internal combustion pressure sensors monitoring the
> combustion pressures, I would not be comfortable with the timing set 
> at 25d
> BTDC for a 10:1 CR experimental version of the 8.7:1 Lycoming engine.
>  
>  Regards,  George
>
> """
>  I'm willing to bet at a 5 deg retard you are giving up power and fuel
> economy.  Unless you are detonation sensitive, I would expect no more 
> than a 2
> deg retard on a 27 deg baseline for a 10 to 1 CR motor.  I would be 
> happy with
> the 3 deg shift.
> """
>
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