It looks like we got ten seconds to back off  when the throttle is
 100% before the manifold pressure runs away to infinity :-) This is
 at 245 feet above sea level.

 When you arrive at 100% throttle the manifold pressure is  50 inches
 of Mercury (Hg) and builds up rapidly to  52 or 53 inches of HG.
 Then of course it shoots up 80 inches of Hg or above. Runaway.

 It is so remarkable  that an all aluminum 200 pound  Wankel Mazda
 engine generating 650 HP will tolerate this. A piston  aircraft
 engine  would blow up and kill you with shrapnel. A good size bomb
 going off.

 The Motec is trying to open the waste gate  (if it were there)
 slamming it back and fourth 50% full on and 50% full off.

 The Lamda on this run was .751 which is  11 to one air fuel ratio.
 Quite rich but this is methanol.

 Normal for methanol is .83 which is 12.2 to one which is about the
 same for gasoline at full power.

 This is with a one inch hole in the bypass exhaust pipe. It does not
 runaway with the stock 1.25 inch hole under static conditions. Dan
 is going to fly it with the stock 1.25 by pass and see if it runs
 away away when the engine RPM climbs to 8,000.

 At that point we can add another parallel waste gate with a spring
 set to 26 inches of boost or make the hole in the bypass aperture
 larger. Say 1.3 or 1.4 inches in diameter up from 1.25 inches.

 Here is an inches of Hg to boost in psi conversion chart and the
 program used to generate it. Plus the start video.

 Paul Lamar



 Paul,

 According to Heywood, the AFR of methanol is 6.5:1.  Are you using
 pure methanol?  How did you come up with the 12:1? Attached is a
 table of common fuels, their associated metrics, and a simplified
 method of calculating AFR. Aaron Buster

 Research Engineer Advanced Powertrain and Emissions Spark Ignited
 Engines R&D Department Southwest Research Institute


 According to our Motec expert to convert from the mixture decimal
 number recorded in the Motec to a mixture ratio you multiply times
 14.7.

 The other thing is if it were really 6.5 :1 based on volume you
 would go through a 20 gallon tank of Methanol really fast at 650 HP.
 We ran it for at least 26 minutes on 20 gallons. Therefor I doubt
 that is the correct mixture ratio.

 Paul Lamar

 You are right! There is something wrong with that mixture number.

 We ran it again this morning. More on this later.

 Paul Lamar

 It is important to always be rich on methanol. Murry Rozansky

 Yes I know that. The question is how do you convert a decimal number
 like .743 out of the Motec to a conventional mixture ratio? Like 12
 to one or 14 to one?

 The conversion is in question. Not the number.

 We ran it again this morning and Dan wants a blow off valve on the
 intake manifold set to 20 inches of boost. So that is in the works.
 This is the one I have chosen.

 Paul Lamar


MOTEC AFR meter: http://tinyurl.com/htr4rxf
Todd Archer

Great work Todd. Finding that table in the Motec doc is a great achievement.
Thanks!  Your hired :-)

Paul Lamar


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