Hello -
(Sorry if this has already been posted)
This is from the 1977 NASA document :
Here's the (very old) engine they used :
You can read it here :
EMISSIONS AND TOTAL ENERGY CONSUMPTION OF A MULTICYLINDER PISTON ENGINE RUNNING ON GASOLINE AND A HYDROGEN-GASOLINE MIXTURE
http://ntrs.nasa.gov/archive/nasa/ca...1977016170.pdf
CarloSW2