digidocs
Well Known Member
I stumbled across some interesting data today:
According to the EPA[1], the average gasoline sold in Houston in 2006 contained 10.07% ethanol and had a Reid vapor pressure (RVP) of 6.92psi.
According to the EAA[2], the specs for 100LL call for a RVP of 5.5-7.0 psi.
This data suggests that mogas with 10% ethanol (in Houston) actually conforms to the 100LL specification for vapor pressure and thus would be no more likely to exhibit vapor lock than "certified" fuel.
Of course, this doesn't address material compatibility, octane, or water issues but its certainly an interesting data point.
Fly safe (and with engineering data),
-DC
References:
1. http://www.epa.gov/otaq/regs/fuels/rfg/properf/hous-tx.htm
2. http://www.eaa.org/autofuel/avgas/avgas_specs.asp
According to the EPA[1], the average gasoline sold in Houston in 2006 contained 10.07% ethanol and had a Reid vapor pressure (RVP) of 6.92psi.
According to the EAA[2], the specs for 100LL call for a RVP of 5.5-7.0 psi.
This data suggests that mogas with 10% ethanol (in Houston) actually conforms to the 100LL specification for vapor pressure and thus would be no more likely to exhibit vapor lock than "certified" fuel.
Of course, this doesn't address material compatibility, octane, or water issues but its certainly an interesting data point.
Fly safe (and with engineering data),
-DC
References:
1. http://www.epa.gov/otaq/regs/fuels/rfg/properf/hous-tx.htm
2. http://www.eaa.org/autofuel/avgas/avgas_specs.asp
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