gas
Senior User
Joined: Jun 2011
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From: Bristow, VA
The only difference between 93 & 87 octane is the detergents that are added at the gas station. That being said, the tanker truck that fill up the stations only carry regular gas and the attendants are suposed to put in the detergents in the 89 and 91 or 93 to change the octane. Is it done, probubly not always, so don't worry obout it.
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Elder User
Joined: Apr 2011
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From: Bremerton, Wa
The only way to actually get performance out of higher octane is if you advance the timing for it, but it will detonate on regular gas.
Put regular in her,
If she starts to ping under light load, adjust the timing.
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Elder User
Joined: Apr 2011
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From: Bremerton, Wa
The only difference between 93 & 87 octane is the detergents that are added at the gas station. That being said, the tanker truck that fill up the stations only carry regular gas and the attendants are suposed to put in the detergents in the 89 and 91 or 93 to change the octane. Is it done, probubly not always, so don't worry obout it.
The fuel comes to the stations in different tanks (of diffeent octane)
The additives are not what change the octane
Octane is important to some engines.
It's the fuels resistance to detonation.
Elder User
Joined: Apr 2011
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From: Bremerton, Wa
Senior User
Joined: Jul 2009
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My stock 77 runs much quieter when I put 93 octane in it compared to 87. I always assumed it was because with the absence of lead in fuel now, it needed higher octane to compensate. Maybe this is totally wrong, but there is a noticable difference in engine noise and how smooth it runs.
Is it OK to run 87 in it? Sure id say it is... Ive ran mine with 87 and it does just fine, its just louder for what ever reason
Is it OK to run 87 in it? Sure id say it is... Ive ran mine with 87 and it does just fine, its just louder for what ever reason
Elder User
Joined: Apr 2011
Posts: 632
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From: Bremerton, Wa
My stock 77 runs much quieter when I put 93 octane in it compared to 87. I always assumed it was because with the absence of lead in fuel now, it needed higher octane to compensate. Maybe this is totally wrong, but there is a noticable difference in engine noise and how smooth it runs.
Is it OK to run 87 in it? Sure id say it is... Ive ran mine with 87 and it does just fine, its just louder for what ever reason
Is it OK to run 87 in it? Sure id say it is... Ive ran mine with 87 and it does just fine, its just louder for what ever reason
is it "Ping/Knock"?
if so, you should be able to adjust the timing a bit (if this dosn't help, you may "Need" to run higher octane, but that's a seperate problem)
sometimes, you get so much buildup of carbon on the pistons that it can raise the compression of of the engine, causingthis.
I'm not sure, but I believe that your truck (1977) was never intended to run leaded gasoline
I believe all us vehicles were designed to use unleaded gas by 1975
Tuned
Joined: Mar 2011
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The only difference between 93 & 87 octane is the detergents that are added at the gas station. That being said, the tanker truck that fill up the stations only carry regular gas and the attendants are suposed to put in the detergents in the 89 and 91 or 93 to change the octane. Is it done, probubly not always, so don't worry obout it.
The detergent packages used by different gas stations are added at the distribution center, not at the station.
Hotshot
Joined: Mar 2007
Posts: 10,101
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From: Pa
Depending where you live the higher octane fuels usually have less ethanol content. Ethanol can cause detonation issues among many other issues. I try to avoid gas with ethanol in it especially if you store your truck over the winter or something. Luckily I can still get pure gas in my area.
If your running 93 now wait until the tank is around half full and refill with 87. If no detonation fill with 87 again when the tanks at around half full and listen for detonation.
If your running 93 now wait until the tank is around half full and refill with 87. If no detonation fill with 87 again when the tanks at around half full and listen for detonation.