REFLECTOR: CHT too cool

[Brian Michalk]

How do you change timing?  Is it all in software?
I'm pretty sure only the PRISM system uses feedback of peak pressure
pulses to set timing, and all others like the ElectroAir run open loop.
 How would it know what your engine requirements are?

SlvEgl99 at aol.com wrote:
> I have a Rose ElectroAir on one side. It is the old style for an IO540.
> To time it, set #1 to TDC. Insert a pin in the housing to hold the rotor
> (large gear) in position. Insert the ignition into the engine with #1 at
> TDC and the pin in place. Tighten the bolt that secures the ignition and
> then remove the pin. The ignition does adjust timing based on RPM to
> advance timing when at higher RPM.
>  
> Bob Wood
>  
> In a message dated 6/9/2009 4:50:01 P.M. Eastern Daylight Time,
> cjensen at dts9000.com writes:
> 
>     Brian,
> 
>     I'm running a mag on one side and a Rose Ignition on the other.  I
>     was under the impression that the Rose timing is supposed to be
>     self-adjusting.  I wonder if that's a misconception?
> 
>     Chuck Jensen
> 
> 
>     -----Original Message-----
>     From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org]On
>     Behalf Of Brian Michalk
>     Sent: Tuesday, June 09, 2009 11:19 AM
>     To: Velocity Aircraft Owners and Builders list
>     Subject: Re: REFLECTOR: CHT too cool
> 
> 
>     Duh.  It's right there.
> 
>     With low CHT's, it's an excellent opportunity to advance timing.  Yours
>     might be a little late, and advancing should bring the temps up a
>     little, because you would be making more power.
> 
>     Chuck Jensen wrote:
>     > Cylinder head temp problems are not unusual, but I have a different
>     > twist.  My CHT's are too cool.  I can only recall once or twice
>     that a
>     > cylinder head ever got to 400F.  Most run 350F to 390F during hot,
>     > hard climbs, but at cruise, and running lean of peak, it's not
>     unusual
>     > for 2 to be below 300F and the rest just barely over 300F.
>     > 
>     > Now, it well known that engines are most efficient at higher temps
>     and
>     > I believe Lyco's recommendation for an IO-540 K1A5 is CHTs in the
>     375F
>     > to 400F temp range.  This would also seem to imply that I'm suffering
>     > unnecessary cooling drag from overcooling the CHs.  Oil temps at
>     > cruise are 195F-200F but will rise to 240F during long climbs.
>     > 
>     > So, my question is, 'is there a way 'adjust' cooling to CHs' that may
>     > reduce drag by reducing inflow through the overhead NACAs for
>     > downdraft cooling, without sending the CHTs too high during climb or
>     > aggravating oil temps during those climbs as well?
>     >
>     > Chuck Jensen
>     >
>     >     
>     >
>     >
>     ------------------------------------------------------------------------
>     >
>     > _______________________________________________
>     > To change your email address, visit
>     http://www.tvbf.org/mailman/listinfo/reflector
>     >
>     > Visit the gallery!  www.tvbf.org/gallery
>     > user:pw = tvbf:jamaicangoose
>     > Check new archives: www.tvbf.org/pipermail
>     > Check old archives:
>     http://www.tvbf.org/archives/velocity/maillist.html
> 
>     _______________________________________________
>     To change your email address, visit
>     http://www.tvbf.org/mailman/listinfo/reflector
> 
>     Visit the gallery!  www.tvbf.org/gallery
>     user:pw = tvbf:jamaicangoose
>     Check new archives: www.tvbf.org/pipermail
>     Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
>     _______________________________________________
>     To change your email address, visit
>     http://www.tvbf.org/mailman/listinfo/reflector
> 
>     Visit the gallery!  www.tvbf.org/gallery
>     user:pw = tvbf:jamaicangoose
>     Check new archives: www.tvbf.org/pipermail
>     Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
> 
> 
> ------------------------------------------------------------------------
> *A Good Credit Score is 700 or Above. See yours in just 2 easy steps!
> <http://pr.atwola.com/promoclk/100126575x1221322977x1201367197/aol?redir=http://www.freecreditreport.com/pm/default.aspx?sc=668072%26hmpgID=62%26bcd=JunestepsfooterNO62>*
> 
> 
> ------------------------------------------------------------------------
> 
> _______________________________________________
> To change your email address, visit http://www.tvbf.org/mailman/listinfo/reflector
> 
> Visit the gallery!  www.tvbf.org/gallery
> user:pw = tvbf:jamaicangoose
> Check new archives: www.tvbf.org/pipermail
> Check old archives: http://www.tvbf.org/archives/velocity/maillist.html
-------------- next part --------------
A non-text attachment was scrubbed...
Name: michalk.vcf
Type: text/x-vcard
Size: 210 bytes
Desc: not available
URL: <http://www.tvbf.org/mailman/private/reflector/attachments/20090609/ff512495/attachment.vcf>