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#1 |
72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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is this true?
okay I've heard this from a few different people now, if you mix 50/50 87 regular and 91 super in your take it makes 95 octane. I've asked a couple friends about it and they just looked at me like I didn't make it to the first grade and can't do simple addition.
anybody ever heard of this? |
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#2 |
Merciless Butcher
Join Date: Oct 2003
Location: CC Nevada
Posts: 1,447
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Nope, Never heard of it.
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Your Bought And Sold....I Got Your Soul! |
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#3 |
I love doing it topless
Join Date: Oct 2003
Location: MossyRock, WA
Posts: 493
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Google search
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Mikey "If you can read this, thank a teacher; If you are reading it in English, thank a soldier." ![]() |
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#4 |
Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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If you want 95 octane, you'd have to blend aviation fuel (cam2) with 93. I did that alot when I was running a 12.5:1 compression 283 in my Model A. I should mention that if your engine doesn't ping using 93, there's no reason to run any higher octane. It won't make your truck any faster.
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#5 |
Senior Member
Join Date: Jan 2003
Location: daytonabeach
Posts: 22,956
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WELL??? did you make it to first grade ???
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71c-10 350/2004r/4:11 lowered3/4 longbed/dead by hurricane MEANING OF DEATH::::: SOMEBODY ELSE GETS YOUR STUFF DONT BELIEVE EVERYTHING YOU THINK TAKE MY ADVISE;I DON'T USE IT ANYWAY |
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#6 |
72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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yeah, I figured it was BS. thanks for the link.
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#7 |
Senior Member
Join Date: Apr 2000
Location: Delta,Pa
Posts: 14,950
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87 and 91 will be somewhere around 89 whoever told u that was either blowing smoke up your @ss or shouldnt be allowed to operate a car much less work on it
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Owner of North Point Car Care in Dundalk Md. We specialize in custom exhaust on both modern and classic vehicles. We are a full service auto shop from classics to modern vehicles. Feel free to contact me with questions. I will give a 10% discount to any board member. |
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#8 |
72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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randy, I'm not looking to go faster, just trying to get rid of the dentonation. I've tried boosters and marvel mystery oil, no change. Timed it way up and way down, still pings.
ORW sells race gas but it's $36 for 5 gallons |
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#9 |
20' Daredevil (Ret)
![]() Join Date: May 2003
Location: Jefferson State
Posts: 13,643
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How about getting rid of carbon buildup in the combustion chambers? That can lead to detonation partly because it increases the compression ratio, but mainly because the carbon will create hot spots. Dunno about other products, but Mopar Combustion Chamber Conditioner p/n 04318001AB ($5.75) works great - I just used it on our 95 Grand Cherokee and the pinging stopped. Sure makes a lot of smoke, though!
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- Mike - 1972 K20 LWB 350/350/205 RIP El Jay |
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#10 |
Registered User
Join Date: Mar 2001
Location: Moore, Ok
Posts: 1,149
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Marvel oil is a great product but putting it in your gas is likely to create addition detonation problems not cure any. The octane boosters probably will help if you mix in enough to actually raise your octain level a point or two, but you'll go broke buying the stuff. I haven't personally used anything in the links below but you might take a look and see if it's something you want to try. If you try it let us know how it goes. Good luck.....Stroker
http://www.team.net/sol/tech/octane_b.html http://www.vtr.org/maintain/gasoline-octane.html http://www.gnttype.org/techarea/misc/octanebooster.html http://www.gnttype.org/techarea/misc/Octanemix.html http://www.syty.org/archives/syty/0112/msg00203.html
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72 SWB parts and pieces Oklahoma |
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#11 |
Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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![]() Dion- try backing down your timing. Turn clockwise (just a little) if it sounds a little better then turn a little more. |
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#12 |
Binder Rep
Join Date: Jan 2001
Location: Salcha, AK
Posts: 1,506
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Some gas stations sell race gas that's street legal, not a whole lot though. The legal stuff has the road tax...
There's one back in TN (in GA for turkey day). In aviation 100 octane "low lead" (100LL, blue) fuel is extremely common, a lot of hot rodders love to get the stuff because not only is it high octane, the lead increasing the octane rating doesn't drop the power availible from the fuel as much as the stuff they use now does (100LL is supposed to increase power output from most engines, even if it's not to stop pinging). 80/87 AVGAS also has some lead, but it's lower octane, 100/130 octane avgas isn't very common place anymore. BTW, all fuel actually has two octane numbers, the one they tell you is devised by averaging them (the RM/2 method sign you see at all the gas pumps). The thing is, it's not exactly legal to run 100LL in a street vehicle. It's legal to buy it for your ultralight, but not for your pickup. Sorry for the basicaly offtopic ramblings... |
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#13 |
72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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stroker, is that true? thanks for the info. I know guys who swear by that stuff, they say it slows the burn helping with the dentonation. It didn't help anyway. It did quiet down my lifters though!
thanks Randy, I did back the timing down and it didn't seem to help. just made the truck run like crap. this all started when I went from 76cc heads to 64 cc heads. the thing is though, the truck runs great, just sounds a little off. I'm starting to think it might just be my mufflers going bad ?? |
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#14 |
Psycho-billy Member
Join Date: Jul 2001
Location: about 40 miles west of Cleveland, Ohio
Posts: 2,591
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What kind of pistons do you have.......flat top, dome, dish?
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'72 C-10 350 w/Lunati Voodoo cam (207*/213*, .437/.454), Performer intake, 625 Road Demon Jr. and Hooker headers. Support your community, support yourself. Buy local, buy American ![]() |
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#15 |
72 Cheyenne
Join Date: Oct 2001
Location: San Diego
Posts: 2,086
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lux, dished
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#16 |
Registered User
Join Date: Jul 2000
Location: Victoria,BC, Canada
Posts: 1,300
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I had a prob with detonation that i thought was untreatable, a good mechanic changed the vacuum advance settings and the improvement was amazing. Just a thought.
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71 GMC 1500 LWB |
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#17 | |
Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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Quote:
Spoof has a good point too. |
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#18 |
Seeker of the big and bad
Join Date: Nov 2000
Location: wheatland,Calif,yuba
Posts: 105
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Just a thought on your detination problem, Have you checked the advance curve on your distributor? You changed alot from the stock components of your motor so the stock curve might be wrone,Hint,no change when you turn the distributor.you can turn it all you want but if the springs are wrong it will advance quicker or stay retarded longer than the motor reqires.Just asking
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71 3/4 ton 4x4,665hp 454. 67 GMC 1 ton towtruck 68 chevy LB 4x4 64 chevy LB custom 57 Bel-air 2d station wagon |
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#19 | |
Registered User
Join Date: Mar 2001
Location: Moore, Ok
Posts: 1,149
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dion, I can't say that I have any way to prove that it will cause detonation. But oil has a very low Octane rating and can be a cause of high rpm detonation. Normally this occurs because of poor ring seal and crankcase oil gets into the combustion chamber. Marvel is a lighter oil than standard motor oil and it may in some cases be of use when mixed in gas, for example to free a stuck ring. I don't believe it would be of any use to prevent detonation, but a mixture of water and marvel oil dribbled into the carb might be usefull if you have some carbon build up. I think I came across this method of carbon cleaning was suggested by a moderator on chevytalk..
Quote:
http://www.mg-tri-jag.net/tech6.htm
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72 SWB parts and pieces Oklahoma Last edited by Stroker; 11-27-2003 at 01:04 AM. |
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#20 |
My other Love
Join Date: Aug 2001
Location: Castlegar B.C. Canada
Posts: 4,085
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I am lucky because my local Chevron and most chevrons in the area have 94 octane, the ole ls6 dont like much lower then 93 even if I back off the timing, the compression is around 12.2:1, but if you wanna have fun $$$$$$$
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#21 |
Merciless Butcher
Join Date: Oct 2003
Location: CC Nevada
Posts: 1,447
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Someone mentioned it's not legal to run race gas on the streets. Probably because no road use tax was paid on it....Greedy government ya know.
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#22 |
My other Love
Join Date: Aug 2001
Location: Castlegar B.C. Canada
Posts: 4,085
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ya but who's gonna find out that you are running race gas anyways?
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#23 | |
Account Suspended
Join Date: Mar 2001
Location: Virginia Beach, Va. U.S.A.
Posts: 15,320
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Quote:
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#24 |
Senior Member
Join Date: Apr 2000
Location: Orlando, FL
Posts: 1,076
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If I remember right..a while back I read somewhere about mixing the gases to boost the octane level. I remember it was 25% LEADED regular mixed with 75% 93 octane UNLEADED premium. The addition of the lead boosts the octane level of the premium. Can't substantiate this but the trick is to add leaded gas to unleaded premium. I don't know if this was clear on the original post. Obviously mixing the two as unleaded is going to decrease the octane level to something in between the two.
Like I said I can't remember where I read this or substantiate any of it. ![]()
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#25 | |
Binder Rep
Join Date: Jan 2001
Location: Salcha, AK
Posts: 1,506
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Quote:
Race gas is legal on the streets as long as you get the stuff that has the tax paid on it, you *can* find it. There is a gas station in TN that sells it at one of its pumps, road tax and all and you can pump it directly into your car. AVGas never has the tax paid on it at the airport since airplanes try to avoid roads! I think there might also be an issue with the AVGas having lead in it too... don't remember if the stuff about leaded gas on the roads applies to vehicles that originally were designed for leaded gas. |
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