ssp@dutoit.UUCP (02/25/86)
Does anyone know where I can obtain 98 octane LEADED gasoline?
The problem is that I have a European specification car with the following
engine:
capacity: 1781cc
stroke: 86.4mm
bore: 81mm
compression: 10.0
which produces 82kw at 5500rpm and 157Nm at 3100rpm. According to the book,
it requires 98 RON (Research Octane Number indicating anti knock properties
of the petrol) Premium petrol. What car is it?
The car has been modified slightly to meet the DOT safety requirements but
*NOT* the EPA emissions (since I was immigrating at the time), so the
engine is unchanged (no catalytic converter etc.).
Three "solutions" have been suggested to me:-
1) Mix regular leaded and super unleaded in egual proportions.
2) Use octane boosters.
3) Use racing (114 octane) fuel!
Any suggestions as to which is the best &/or the most cost-effective solution?
Shamim Pirzada AT&T Bell Labs
research!ssp
(201) 582 53542212msr@whuts.UUCP (ROBIN) (02/26/86)
> > Does anyone know where I can obtain 98 octane LEADED gasoline? > > The problem is that I have a European specification car with the following > engine: > capacity: 1781cc > stroke: 86.4mm > bore: 81mm > compression: 10.0 > > which produces 82kw at 5500rpm and 157Nm at 3100rpm. According to the book, > it requires 98 RON (Research Octane Number indicating anti knock properties > of the petrol) Premium petrol. What car is it? *** REPLACE THIS LINE WITH YOUR MESSAGE *** The octane posted on the pumps these days is the average of RON & MON (research method and motor method). RON is approximately 4 points higher than current pump postings via averaging method. So, 94 octane posted is 98 RON. Sunoco Ultra is 93.5, which I believe is as close as you're going to find, but it is unleaded. I've been running that in a Volvo 1800E which had a 10.5:1 CR before I hopped it up. An occasional tank of leaded regular mixed in seems to do just fine. I've seen no problem with valves etc.
tohaapanen@watrose.UUCP (Tom Haapanen) (02/26/86)
In article <2095@dutoit.UUCP> ssp@dutoit.UUCP writes: > >The problem is that I have a European specification car with the following >engine: > capacity: 1781cc > stroke: 86.4mm > bore: 81mm > compression: 10.0 > >which produces 82kw at 5500rpm and 157Nm at 3100rpm. According to the book, >it requires 98 RON (Research Octane Number indicating anti knock properties >of the petrol) Premium petrol. What car is it? The answer is obvious ... a European-spec VW Golf GTI. >Three "solutions" have been suggested to me:- >1) Mix regular leaded and super unleaded in egual proportions. >2) Use octane boosters. >3) Use racing (114 octane) fuel! 4) Reduce compression (alas, also reduces power output) >Any suggestions as to which is the best &/or the most cost-effective solution? Regular leaded/super unleaded is definitely the most cost-effective, but it may no longer work with the lead content in leaded down to 0.1 grams (or was it milligrams?). Can the European GTI's engine compensate for lower octane ratings by retarding timing? Then you could just add octane boosters when you need the performance. \tom haapanen watmath!watrose!haapanen I'm all lost in the Supermarket I can no longer shop happily I came in here for that special offer Guaranteed personality (c) The Clash, 1979
olds@ihlpa.UUCP (Mondeville) (02/27/86)
> > > > Does anyone know where I can obtain 98 octane LEADED gasoline? > > > > Sunoco Ultra is 93.5, which I believe is as close as you're Can someone tell me if they're any sunoco stations in Chicago or surrounding suburbs and how much a gallon this Sunoco Ultra is?? Also,I heard that on Friday& Saturday nights sunoco sells 103.5 octane fuel,can anyone confirm this and if so how much a gallon?,and where I can get some?? E.G.Mandeville ihnp4!ihlpa!olds AT&T Bell labs `
jparnas@vger.UUCP (John M. Sully) (03/02/86)
In article <2095@dutoit.UUCP>, ssp@dutoit.UUCP writes: > > Does anyone know where I can obtain 98 octane LEADED gasoline? > > Three "solutions" have been suggested to me:- > 1) Mix regular leaded and super unleaded in egual proportions. > 2) Use octane boosters. > 3) Use racing (114 octane) fuel! > > Any suggestions as to which is the best &/or the most cost-effective solution? > I forget the chemical reasons for it, but mixing regular leaded and super unleaded will actually produce an "octane hump" of 1 or 2 points. this will result in a mix with a pump octane rating of about 93. Note that the octane ratings which you see posted on pumps are pump octane ratings. There are two different methods of measuring octane, the research method (RON) and the motor method. The numbers given by the research method are typically 5-10 points higher than those given by the motor method and so the feds came up with pump octane, which is simply MON + RON / 2. So a 93 pump octane fuel should be good enough for your motor since it calls for 98 RON gasoline. If your engine knocks under these conditions then the octane is too low and you will have three choices: 1. Use an octane booster -- expensive for a good one 2. Use racing or aircraft fuel -- also very expensive 3. Lower the compression ratio of your engine by installing a thicker head gasket. ( done on motorcycles usually ) ============================= John M. Sully BITNET : suzuki@ucscc.BITNET ARPA : ucscc!suzuki@ucbvax.berkeley.edu UUCP : ..!ucbvax!ucscc!suzuki
jeq@laidbak.UUCP (Jonathan E. Quist) (03/06/86)
In article <2095@dutoit.UUCP> ssp@dutoit.UUCP writes: > >Does anyone know where I can obtain 98 octane LEADED gasoline? > Your local airport Fixed-Base Operator will sell you 100LL (100 octane low lead) avgas for about $2 per gallon. Jonathan E. Quist ihnp4!laidbak!jeq