Not suitable for use in internal injection. The "advantages" of NPG as an engine coolant are very controversial (many performance people consider it a snake oil solution). It is not as good a coolant as water, will not atomize as well as water or alcohol due to its high viscosity, its high boiling point will nearly eliminate any evaporative cooling.
Its only advantage as an engine coolant is it will not boil at coolant temperatures that would be a serious risk of causing engine detonation in a high performance engine.
propylene glycol
Specific heat .590 cal/gm (59% of water)
Latent heat of evaporation 168.6 cal/gm (31% of water)
boiling point 187.3 deg C
viscosity 0.581 poise (almost 58 times thicker than water)
water
specific heat 1 cal/gm
Latent heat of evaporation 540 cal /gm
boiling point 100 deg C.
viscosity 0.01002 poise
Larry
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