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What fuel octane do you use?

Started by 303 Mopar, November 12, 2017, 06:35:33 PM

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73440

Quote from: Brads70 on November 16, 2017, 02:29:58 PM

But it does smell nice! Especially the Oxygenated Racing Fuels .... smells like perfume to me!  :D
I often use VP leaded 110 in the Harley and love to sniff the gas cap while sitting at the light .

cj


Racer57

Octane is a knock deterrent and does nothing towards hp. Its common for people to think a higher octane gives more power due to high performance engines using it. But they are using it because of higher compression and/or timing that requires it.

Racing gasolines makeup is more than just octane.


Cuda_mark

I use 93 at the pump in my 1970 440 six and 396 chevelle but I store them and occasionally run with VP110 leaded. Love that smell...

cudabob496

Seems octane helps power in my 98 Escort. 89 Octane makes the car run better and
have more power than 87 Octane.
72 Cuda, owned for 27 years, 496, solid roller, 3500 stall, 3.91 gears, ported Stage VI heads, 3 inch X-pipe exhaust, 850 DP, ram air setup, fuel cell, batt in trunk,
Wilwood brakes, Weld wheels, MT ET Street tires, fiberglass hood, Alum radiator.

MOPAR MITCH

When choosing a octane, remember that your choice should be based upon need -- simply to avoid engine knock (pre-ignition/detonation -- worst killers of head gaskets... can also damage pistons/rings/rod bearings).  If you drive mildly, you can probably get away with lower octane, but if/when you drive aggressively putting the pedal-to-the-metal, and/or towing, etc, then upping the octane rating will be to your benefit so to avoid pre-ignition/detonation.     

Bluemonster71RT

Quote from: Racer57 on November 17, 2017, 06:32:43 AM
Octane is a knock deterrent and does nothing towards hp. Its common for people to think a higher octane gives more power due to high performance engines using it. But they are using it because of higher compression and/or timing that requires it.

Racing gasolines makeup is more than just octane.

But like in my case it allows me to bump my timing up a little more and does give better use of power. Though it does not add extra power it allows you to use it more effectively.


cudabob496

Kinda confused here. If you run a higher octane, you can sometimes
increase timing advance, and therefor make more power. So higher octane
can help your engine make more power. On the new Dodge Demon, you add
about 40 hp by going to race gas.
72 Cuda, owned for 27 years, 496, solid roller, 3500 stall, 3.91 gears, ported Stage VI heads, 3 inch X-pipe exhaust, 850 DP, ram air setup, fuel cell, batt in trunk,
Wilwood brakes, Weld wheels, MT ET Street tires, fiberglass hood, Alum radiator.

Racer57

Quote from: Bluemonster71RT on November 17, 2017, 05:47:56 PM
Quote from: Racer57 on November 17, 2017, 06:32:43 AM
Octane is a knock deterrent and does nothing towards hp. Its common for people to think a higher octane gives more power due to high performance engines using it. But they are using it because of higher compression and/or timing that requires it.

Racing gasolines makeup is more than just octane.
But like in my case it allows me to bump my timing up a little more and does give better use of power. Though it does not add extra power it allows you to use it more effectively.

Quote from: cudabob496 on November 17, 2017, 06:50:23 PM
Kinda confused here. If you run a higher octane, you can sometimes
increase timing advance
, and therefor make more power. So higher octane
can help your engine make more power. On the new Dodge Demon, you add
about 40 hp by going to race gas.
Your agreeing with what I said.  :D

cudabob496

Quote from: Racer57 on November 17, 2017, 07:39:40 PM
Quote from: Bluemonster71RT on November 17, 2017, 05:47:56 PM
Quote from: Racer57 on November 17, 2017, 06:32:43 AM
Octane is a knock deterrent and does nothing towards hp. Its common for people to think a higher octane gives more power due to high performance engines using it. But they are using it because of higher compression and/or timing that requires it.

Racing gasolines makeup is more than just octane.
But like in my case it allows me to bump my timing up a little more and does give better use of power. Though it does not add extra power it allows you to use it more effectively.

Quote from: cudabob496 on November 17, 2017, 06:50:23 PM
Kinda confused here. If you run a higher octane, you can sometimes
increase timing advance
, and therefor make more power. So higher octane
can help your engine make more power. On the new Dodge Demon, you add
about 40 hp by going to race gas.
Your agreeing with what I said.  :D

yes, but like I said, my 98 Escort only requires 87 Octane, but runs stronger on 89? Why is that?
72 Cuda, owned for 27 years, 496, solid roller, 3500 stall, 3.91 gears, ported Stage VI heads, 3 inch X-pipe exhaust, 850 DP, ram air setup, fuel cell, batt in trunk,
Wilwood brakes, Weld wheels, MT ET Street tires, fiberglass hood, Alum radiator.

Chryco Psycho

The computer in the escort is sensing knock on 87 & can adjust on 89 to give more power without damage


cudabob496

ok, so without sensing knock, computer will advance timing.
makes sense. So, wonder what it will feel like if I go 92 octane.
will try it.
72 Cuda, owned for 27 years, 496, solid roller, 3500 stall, 3.91 gears, ported Stage VI heads, 3 inch X-pipe exhaust, 850 DP, ram air setup, fuel cell, batt in trunk,
Wilwood brakes, Weld wheels, MT ET Street tires, fiberglass hood, Alum radiator.

71-440

93 Octane here. Higher Octane to decrease the chance of knocking and get the most power out of what your engine is capable of producing.
My '09 5.7 had knock sensors. if a knock or ping was detected it would adjust timing to stop it which would affect the power output the engine
was capable of producing. I ran 93 in that car also. I might add that those sensors are very sensitive. They can pick up a ping or knock that your ear can't detect.
Anyway that's what I learned in the 5 years I had that car talking to different engine builders.
Joe

ToxicWolf

I use 93 in all of our cars ... Even my wife's Prius.  I've been told that higher octain gas improves milage in all cars.  :notsure:

Racer57

Quote from: ToxicWolf on January 09, 2018, 08:03:49 PM
I use 93 in all of our cars ... Even my wife's Prius.  I've been told that higher octain gas improves milage in all cars.  :notsure:
But does it increase the mileage enough to pay the additional expense of the fuel ?
Btw, on a Graveyard Cars episode when they fired up a '70 dual quad Hemi,  Mark Worman said "Everytime a dual quad Hemi starts, a Prius dies".  :D