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#1
02-13-2007, 03:53 PM
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Question about Mixing gasoline
If you mix gasoline of different octane levels, is the resulting octane based strictly on volume? For example, if I go 50/50 with 90 octane and 100 octane, is the result 95? Or is it not that simple?
thanks Fred
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MB-less 
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#2
02-13-2007, 04:00 PM
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i dunno, but i guess yes.
tom w
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.  [SIGPIC]..I also have a 427 Cobra replica with an aluminum chassis.
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#3
02-13-2007, 04:10 PM
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That sounds correct in terms of proportionality. As i understood the gas stations only have 2 types of gas. Regular and Premium, they just mix it to get the mid grade fuel.
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1974 240D 3.0L 4(M) - 250K -OM617.910 + 300D FW + Rajay turbo power! 1977 6.9 3(A) - 84k
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#4
02-13-2007, 04:11 PM
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Hey Fred,
I thought you were the gas expert.  I think it is that simple. http://www.gnttype.org/techarea/misc/Octanemix.html
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-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/831799-post13.html http://www.peachparts.com/shopforum/831807-post14.html
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#6
02-13-2007, 04:52 PM
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If the gasoline was a mixture of heptane and octane, this would be exactly the case. I don't know if gasoline ever was a mixture of heptane and octane, but it is not now. Otherwise it would be impossible to achieve greater than 100 octane gasoline.
There is still something like a base material with additives used to increase knock resistance, and the proportion of the additives will likely be close to linear with the octane number assigned. It is unlikely to be exactly proportional, but since you're talking about a small difference, it will be close enough.
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#7
02-13-2007, 04:55 PM
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Well I thought you had it right, but I had to go to site I linked to be sure.
Suprisingly they have an excel spreadsheet you can download to input your voulme of gas and octane rating for a blended octane rating... seams like overkill for such a simple calculation.
__________________
-Marty 1986 300E 220,000 miles+ transmission impossible (Now waiting under a bridge in order to become one) Reading your M103 duty cycle: http://www.peachparts.com/shopforum/831799-post13.html http://www.peachparts.com/shopforum/831807-post14.html
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#8
02-13-2007, 05:48 PM
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Quote:
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Current Benzes 1989 300TE "Alice" 1990 300CE "Sam Spade" 1991 300CE "Beowulf" RIP (06.1991 - 10.10.2007) 1998 E320 "Orson" 2002 C320 Wagon "Molly Fox" Res non semper sunt quae esse videntur My Gallery Not in this weather!
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#9
02-15-2007, 10:49 AM
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Years ago when there was no unleaded gas, it was common for hotrodders to add some ethyl to standard gas and come up with something that was higher octane than both. Or maybe it was adding leaded to unleaded.....?
 Something like that.Adding moth balls to the tank was common also.
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 "Our Lady of Blessed Acceleration... don't Fail Us Now"
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#10
02-15-2007, 11:57 AM
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Quote:
But before unleaded gas, Sunoco offered at the pump, "Sunoco 260", a 104-octane racing gas!!! Those were the days!
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2009 ML350 (106K) - Family vehicle 2001 CLK430 Cabriolet (80K) - Wife's car 2005 BMW 645CI (138K) - My daily driver 2016 Mustang (32K) - Daughter's car
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#11
02-15-2007, 02:24 PM
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Quote:
It's called "Turbo Blue" around here.
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-1983 VW Rabbit LS Diesel (5speed, VNT/Giles build)
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