<<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
          <<  Lancair Builders' Mail List  >>
          <<<<<<<<<<<<<<<<--->>>>>>>>>>>>>>>>
>>
> >>
> I'm beginning baffling sealing work on my IO-360 installation and wonder
> what
> the CHTs should be idling on the ground at 80 degrees ambient.  My
> thinking is
> that if I can get things right on the ground, I'll have less of a problem
> in the
> air regarding sealing the baffling.  The engine is a factory new unit with
> one
> hour of dyno time.  Can someone provide a CHT target here?  Also, how long
> does
> it take for the oil temp to begin to move after startup?  
>
Ed -
Well, I actually have a few minutes to write!
I have an IO-320 and the standard Lancair baffling kit. On my
initial flight, Don Goetz impressed on me the importance of sealing EVERY
air leak. I would say the air flowing across the cylinder fins is at least
ten times as effective for heat removal as air escaping other areas. During
my initial flight, CHT's approached 440 degrees during climbout. When Don
and I sealed all the leaks, CHT's dropped to less than 400 degrees during
climbout. Mine are now about 400 degress climbout on a hot Summer day and
about 350-370 at altitude, depending on conditions.
Oil temperature rises slowly after start, usually about 10
degrees/minute, during taxi.
Once, I was behind an idiot who managed to kill his engine prior to
taking the runway on a HOT Summer day. I sat there waiting and waiting for
about three or four minutes and became alarmed as I saw CHT's approach 420
degrees! I spun the plane around on the grass and took the runway. As I
climbed out, I saw the CHT's actually drop, toward the normal climbout of
400 degrees!
Bill Rumburg
N403WR  (Sonic bOOm)  
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
LML website:   http://www.olsusa.com/Users/Mkaye/maillist.html
LML Builders' Bookstore:   http://www.buildersbooks.com/lancair

Please send your photos and drawings to marvkaye@olsusa.com.
>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>