VP C16 versus C14 for normally aspirated gas carberated engines

bigblockmark · Mar 27, 2021

I see racers using C16 because they think it is best for high compression NA engine as it has a high octane rating. But they don't seem to see that the Reid Vapor Pressure is only 2.8 ish. C14 is nearly as high in octane and has a Reid Vapor pressure of about 5.8. This refers to how much light ends the fuel has. C14 has twice as much appprox. Normally aspirated fuels for racing need more light ends than what C16 provides. It is formulated for power adder applications that have very high heat compare to NA engines. This lower raid pressure makes it harder for the ignition to start lighhting off the burn. Not good for NA engines.

Anyone want to expand on this or correct anything i have suggested?

juiced coupe 78 · Mar 28, 2021

Unless it is inconveniencing you, let them think whatever they want. Chances are, nothing you say will change their mind.

All the information is there on VP's site for anyone to read. Or, they can call and ask for a fuel recommendation.

bigblockmark · Mar 28, 2021

Yea kinda. It is on 4 WD truck pull engines that I occasionally rebuild. Even one dynod his on VP16 and Sunoco Maximal 114 at my suggestion and the Sunoco made more power. Dyno guy said it was a fluke. Still runs the VP.

VP C16 versus C14 for normally aspirated gas carberated engines

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