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| 6C - Fuel System Solex, Weber conversions, Fuel Injection, Fuel Pumps, etc. |
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#3 (permalink) |
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Opel Junkie
Join Date: Nov 2003
Location: kansas, gardner, kansas city
Posts: 116
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i run 100 low lead aviation fuel in mine, and it loves it. you can find it at an airport. try to find a place that has self serve fueling, and get to know the people that run the fbo. i am a partner in an fbo at new century, kansas, and we have guys that will come in on fridays to get gas for their hot rods. we chat with them, show them our cars, etc. they get good gas (100+ octane) for a lot less than the track sells it for, and we get to talk cars on friday afternoons!!
ps any of you kansas city area opelers feel free to come out for the good gas!! mike
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GM products are not Opels! |
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#4 (permalink) |
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4ZUA787
Join Date: Sep 2002
Location: Rancho Palos Verdes CA,USA
Posts: 668
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about avaition fuel i have access to my local torrance municiapl airport, i have been thinking of filling up one day with a full tank of 100 octane, it cant hurt to try it, it hasnt killed an opel yet, he he he.
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#5 (permalink) |
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Project 1450 supporter...
Join Date: Mar 2002
Location: Pleasant Valley, CT
Posts: 7,452
Real Name: Bob Legere
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Run the lowest octane you can without detonation. Higher octane will do nothing but empty your wallet. You will also make more hp with the lowest (safe) octane. Dyno proven....
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#6 (permalink) |
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Old Opeler
Join Date: Jun 2003
Location: New Zealand
Posts: 5,686
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Regular vs Premium
A little realised fact is that lower octane gas actually has more energy per pound than high octane gas. Plus the lower octane gas burns quicker and so needs less ignition advance.
The higher octane fuels reduce the tendency to detonate by being made to burn slower. In consequence lower octane gas gives more power and better gas milage - as long as detonation does not occur. Just as Rally Bob says.
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GTJim Opel Owner since last Century! Copyright © 2000-2009 J D Henry All Rights Reserved |
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#7 (permalink) |
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Opel Junkie
Join Date: Nov 2003
Location: kansas, gardner, kansas city
Posts: 116
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aviation fuel
my point with using aviation fuel is this:
burning unleaded fuel in an engine designed to use leaded fuel will cause the exhaust valves to eventually burn up. the valve seats in these engines are not hardened, causing them to heat up and erode faster. aviation fuel contains lead, which does raise the octane, but it also helps cool the exhaust valves & seats. true, lower octane (unleaded) fuels are cheaper, but just try to find a leaded fuel anywhere. the only place you can still get it is at a ractrack, and it's about $4.50/gallon. aviation fuel is around $2.50/gallon.
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GM products are not Opels! |
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#8 (permalink) | |
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opel free after 26 years
Join Date: Jun 2002
Location: sunderland england
Posts: 4,941
Real Name: barry williams
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Copyright © 2003-2009 barry williams All Rights Reserved save praying to God for sunday today we pray to Nike and run like hell |
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#10 (permalink) |
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6,000 Post Club
Join Date: Aug 2002
Location: Imperial Beach, CA South of San Diego
Posts: 6,054
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Here's another thing to consider about using AVGAS. It is formulated to be used in aircraft engines that do not turn above 3750 RPM. They figure out the burn rate at the refinery. I found this out in A & P school. Had a friend way back when I was racing bikes, filled his tank with 110-145 octane, he ran like a bandit for about 3-4 laps, then his engine siezed up. He was jetted for the gas, but it didn't help. And he was running above 10,000 RPM.
Ron |
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#11 (permalink) | |
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Project 1450 supporter...
Join Date: Mar 2002
Location: Pleasant Valley, CT
Posts: 7,452
Real Name: Bob Legere
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Re: aviation fuel
Aviation fuel has an added benefit too, it runs very cool EGT's. A friend of mine used to run it in his Opel racecar, mostly because of the cost. But we found the car ran about 10 degrees cooler water temps and about 200 degree cooler EGT's than with 'real' racing fuel. Another problem in some states is that AV gas can't be sold to non-pilots (that is, to car guys). Here in Connecticut we have our own Department of Environmental Protection (DEP) which is tougher than the EPA. They have made if very difficult to circumvent a lot of these loopholes. Of course, I can drive 1/2 hour north to Massachusetts and they'll not only sell me AV gas, they'll pump it into my gas tank!
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My Flickr photos. Jan. 3, 1984 - Jan. 3, 2009, that's 25 years of this damn Opelitis! C.R.L. 9/22/69 - 12/8/99, J.M.L. 3/3/43 - 6/15/04 |
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#13 (permalink) |
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Member
Join Date: Sep 2003
Posts: 217
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The REAL reason it is illegal to use aviation fuel in a motor vehicle is not the lead/EPA issue but the federal and state highway taxes we pay on the fuel we buy at the pumps. You can get "Farm Only" fuel which depending on locality can be 60 cents a gallon cheaper then the same grade/type highway fuel. The only difference is the tax issue and the dye used to distinguish the two.
Brian |
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#16 (permalink) |
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former opel racer
Join Date: Nov 2002
Location: near some glaciers
Posts: 2,863
Real Name: Jeff "Oh-Oh" Denton
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I think we should go into an explanation of how octane rating and ignition timing go hand in hand. And how ignition timing can affect horsepower.
You ever hear anybody say they switched from low octane to high and the car ran better? I call bull unless they advanced their timing.
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No Opels were harmed in the filming of this movie. However two Mustangs, a Pinto, and a Capri were hospitalized. One Mustang was euthanized the next morning. |
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#17 (permalink) |
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Member
Join Date: Nov 2003
Location: Las Vegas, NV
Posts: 494
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timing is about 5 degree advanced.....given it doesn't ping with the regular grade will it be burning cleaner than with premium?
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Next stop the Twilight Zone..... 1973 Opel GT 1977 Datsun 280Z Previously: 1971 Opel GT 1973 Opel Manta |
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#18 (permalink) | |
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Old Opeler
Join Date: Jun 2003
Location: New Zealand
Posts: 5,686
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GTJim Opel Owner since last Century! Copyright © 2000-2009 J D Henry All Rights Reserved |
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#19 (permalink) |
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former opel racer
Join Date: Nov 2002
Location: near some glaciers
Posts: 2,863
Real Name: Jeff "Oh-Oh" Denton
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As far as the Opels are concerned, we have to keep in mind the "high" compression ones and the "low" compression ones, let's not get anyone confused and cause a mistake (holes in pistons, etc.).
Compression ratio, ignition timing, octane rating. Three factors to fully understand before playing with gas and timing...
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No Opels were harmed in the filming of this movie. However two Mustangs, a Pinto, and a Capri were hospitalized. One Mustang was euthanized the next morning. |
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#20 (permalink) | |
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Über OpelGT.com Moderator
Join Date: Mar 2002
Location: Calgary, Alberta, Canada
Posts: 4,087
Real Name: Keith Wilford
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Octane is a measurement of the TEMPERATURE that gasoline will spontaneously (prematurely) combust. What goes along with that is also the HEAT of combustion, and the SPEED of the flame propagation. Higher octane fuel generally has a higher heat of combustion (more long chain HC molecules which have a greater specific heat when burned) but I believe that the flame speed is actually LOWER at higher octanes. Heady stuff! But in simple terms, if you aren't pinging (detonating) on regular gas, and your ignition is sufficiently advanced to get optimal thermal conversion (35 degrees at maximum advance), then higher (or lower) octane fuel will provide little significant benefit, regarding either power or emissions. Actually, clean crankcase oil has more benefit. Less off-gassing due to accumulated unburned HC's. HTH
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Keith Wilford working on my '71 GT and '75 SportWagon |
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#21 (permalink) |
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Have Opel, Will Travel
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dollarage
One thing not mentioned so far is the fuel consumption with the different octane fuels. In my wagon, running a tank of 87 with lead substitute usually yields @24mpg. With no other adjustments, running 93 octane and the same lead substitute usually yields closer to 27mpg. My jeep is the same way. Since the car doesn't run markedly better either way, what I usually do is compare the dollarage of the fuel when I get ready to pump, ie how many dollars will it cost me to go 200 miles at 87 octane times its price vs. 93 times its price. That's my biggest factor in choosing.
FWIW, I haven't been able to justify premium based on cost with anything more than a few cents difference in price, and at today's prices I just burn the cheap stuff. I still get it once in a while, but not for any particular reason.
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1958 Rekord Sedan, 1958 Olympia Wagon, 1959 Opel Olympia Sedan, 1967 Kadett Coupe, 1967 Admiral Sedan 4L CIH-6, 1968 Kadett fastback 1.1L, 1970 Kadett Wagon Turbo 2.2L, 1971 Kadett Sedan 1.1L, 1975 Manta Wagon 4.3L V-6 |
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#22 (permalink) | |
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Über OpelGT.com Moderator
Join Date: Mar 2002
Location: Calgary, Alberta, Canada
Posts: 4,087
Real Name: Keith Wilford
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Keith Wilford working on my '71 GT and '75 SportWagon |
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#24 (permalink) |
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1000 Post Club
Join Date: Jan 2004
Location: Saginaw, MI
Posts: 1,279
Real Name: Jon
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This may be kind of a simple question but just to get to the point for some people, what is the best fuel to run in a stock Opel engine?
I have a 1973 Opel..should I put in Unleaded Reg, Plus, or Premium. Jared says that he just puts in Plus and it works just fine. With Premium, should I still add a Lead additive, or would I be fine not using it with the Year of engine I got. Thanks in Advance, Jon Samuel
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Current 1970 GT; Under Construction Previous 1969 GT; Street/Strip Project 1969 GT; White with Black Interior, Automatic 1969 GT; Black Parts Car 1969 GT; White Parts Car 1970 GT; Silver with Red Interior 1971 GT; Orange with Black Interior, Turbo 1972 GT; Red Parts Car 1972 GT; Blue with Black Interior 1973 GT; Pearl Blue with Black interior. Full body kit. |
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#25 (permalink) |
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Moderator
Join Date: Mar 2003
Location: corning ny 14830
Posts: 2,182
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the lead additive and octane are not related as far as I know. The prefered octane will be specific per engine (high compression vs low compression) ignition system ect. The lead additive is needed if you dont have hardened valve seats, if you haven't been using it the damage has already been done and it makes no sense to use it now.
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1970 Opel GT 1.9 1980 Moto Guzzi V50 2000 Saab 9-3 2.0 turbo 2000 KTM 200 exc STOLEN |
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