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Seasonal Fuel Blends....

LeonChuppLeonChupp
I have just finished a 160mi. jaunt in the Spyder, after it's third fillup since Carlisle.....This is the longest continuos run since Carlisle....(normaly 30 to 50 mi.) I'm still running the same "93" octane as usual, but both the head and oil temps spiked....nothing serious, but it gets your attention....Timing is still rock solid and idle is still smooth....Runs well at top end....Air temp 87F...2 more than return from Carlisle.......I assume the local oil/fuel supplier has swapped to "Summer Blend"...

Has anyone else had this experience....and would this be "normal" with a carb fed engine???? Inquiring minds want to know.....

And Gordon...I'm not a complete idiot, some pieces are missing....;>)

Of all the things I've lost, I miss my mind the most.....  

 

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LeonChuppLeonChupp
I have just finished a 160mi. jaunt in the Spyder, after it's third fillup since Carlisle.....This is the longest continuos run since Carlisle....(normaly 30 to 50 mi.) I'm still running the same "93" octane as usual, but both the head and oil temps spiked....nothing serious, but it gets your attention....Timing is still rock solid and idle is still smooth....Runs well at top end....Air temp 87F...2 more than return from Carlisle.......I assume the local oil/fuel supplier has swapped to "Summer Blend"...

Has anyone else had this experience....and would this be "normal" with a carb fed engine???? Inquiring minds want to know.....

And Gordon...I'm not a complete idiot, some pieces are missing....;>)
JogyverJogyver
The summer fuel is blended to lower the RVP . Its basically lowering the vapors so you fuel tank does not vent out to create nasty emissions. It a process that the gasoline is oxygenate and blended with other great stuff besides ethanol. Ethanol is in almost all gasolines during both the summer and winter months.
You might find the non oxygenated fuels about 200 miles outside major cities. Too bad the fuels with MTBE wasn't still around. Great HP with in though it's a enviromental nightmare
WildBillWildBill
Volatility is the property of a liquid fuel that defines its evaporation characteristics. RVP is an abbreviation for "Reid vapor pressure," a common measure of and generic term for gasoline volatility. EPA regulates the vapor pressure of gasoline sold at retail stations during the summer ozone season (June 1 to September 15) to reduce evaporative emissions from gasoline that contribute to ground-level ozone and diminish the effects of ozone-related health problems.
FM Former Member
RVP additives: I am under the impression that these are ALL just plain ethanol, perhaps in different percentages in different areas of the country. Am I wrong?

Oregon has a mandate for 10% ethanol at every pump. Only exceptions are farm, off-road (dune buggies) and boats (marinas). Everybody up here is wondering about lawn mowers, weed wackers, chain saws and the like, in addition to effect on the cars (less mileage for sure).
FM Former Member
Ditto to the 10% Ethanol on every pump in Houston. When I purchased my Speedy used, the previous owner said only to use regular unleaded. Not the 92/93 octane stuff. I was curious why myself, but he said that's what it's suppose to use because the engine is so old. ...pre-92 octane. Is there really a difference for our speedies on the type of gas?
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