GOT IT! Inovent Engineering (my dad) designed and built a new carb heat
flapper with a parallel flap that turnes the air into the middle of the
carb.  Rather than a 200<sup>o</sup>F delta in EGT we have a very
acceptable 55<sup>o</sup>F spread!

<p>Each graph shows a 980MSL takeoff on a 40<sup>o</sup>F day with me
(185lbs) and 44 gallons of gas on 2/1/98.  Full power takeoff climb to
2,000MSL and turn crosswind climbing to 2,500MSL.  Downwind is still
full power accelerating to top speed and maxing out on the upwind leg. 
Downwind the second time is cooling down for a full stop landing.  The
first spike is with the <a href=../images/old.jpg>stock carb heat
flaper</a> and the second spike is with the <a
href=../images/new.jpg>parallel flap</a> in the <a
href=../theory.html>carb heat box</a>.  The raw data can be find <a
href=../data>here</a> and click on <tt>works.cap</tt>.  For six separate
graphs press <a href=long.html>here</a>. 

<p>Its intresting to see while CHT #2 went down 15<sup>o</sup>F all the
other cyls went up ~10<sup>o</sup>F.  I'm going to assume that's from
making more power (heat) than before.  So we went from a CHT delta of
60<sup>o</sup>F to 33<sup>o</sup>F.

<p>I mentally recorded:

<li>before climb rate: 700 fpm
<li>after climb rate: 750 fpm (less gas in plane)
<li>before max speed: 136kts indicated
<li>after max speed: 137kts indicated (alittle colder at night)

<center>EGT</center>
<img src=e2.gif width=911 height=623>
<center>CHT</center>
<img src=c2.gif width=911 height=623>
<center>Other probes</center>
<img src=o2.gif width=911 height=623>

<hr>
<p> If you have any ideas how to cool an American General Tiger #2
cylinder please let <a href=mailto:rob@ct.picker.com>me</a> know.