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#1825247 - 03/21/10 01:00 AM Does premium unleaded burn hotter than regular
RTBandit Offline


Registered: 02/24/09
Posts: 75
Loc: California
Just curious - Does 91 octane gas create a hotter explosion than 87 octane? All input is appreciated.

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#1825254 - 03/21/10 01:04 AM Re: Does premium unleaded burn hotter than regular [Re: RTBandit]
daves66nova Offline


Registered: 04/11/04
Posts: 3226
Loc: los angeles
The numbers are just ratings for the level of resistance to detonation,it is not an indicator of "performance"
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#1825260 - 03/21/10 01:14 AM Re: Does premium unleaded burn hotter than regular [Re: daves66nova]
Colt45ws Offline


Registered: 08/15/06
Posts: 7667
Loc: Central Washington
Originally Posted By: daves66nova
The numbers are just ratings for the level of resistance to detonation,it is not an indicator of "performance"

Quoted for truth. Octane is associated with performance because high performance engines have designs that require higher octane. Turbocharging, supercharging, high compression are all reasons that an engine has more performance, they are also reasons they need high octane so they don't have pre-ignition. Pre-ignition can rattle an engine apart and/or burn holes in places they shouldnt be.


Edited by Onmo'Eegusee (03/21/10 01:14 AM)
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#1825266 - 03/21/10 01:23 AM Re: Does premium unleaded burn hotter than regular [Re: Colt45ws]
RTBandit Offline


Registered: 02/24/09
Posts: 75
Loc: California
My question is about temperature not performance.

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#1825268 - 03/21/10 01:33 AM Re: Does premium unleaded burn hotter than regular [Re: RTBandit]
expat Offline


Registered: 05/12/09
Posts: 4196
Loc: Canada
By and large,NO.
ANY substance added to the gas that helps prevent, or delays preignition with give the Gasoline a higher octane rating.
For may years a type of Lead compound was used, Methanol and Ethanol will also serve to raise the octane rating. But they will not cause the fuel to burn hotter.

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#1825270 - 03/21/10 01:34 AM Re: Does premium unleaded burn hotter than regular [Re: RTBandit]
Shannow Offline


Registered: 12/12/02
Posts: 28575
Loc: a prisoner island
Nope, not hotter, faster, slower, or any of the things that our local mower repair man keeps telling my co-workers.

It is merely more resistant to self igniting in the presence of pressure, temperature, and hot spots.

It used to (often) have a lower energy content, but modern refining has made high density high octane fuels.
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#1825272 - 03/21/10 01:35 AM Re: Does premium unleaded burn hotter than regular [Re: RTBandit]
expat Offline


Registered: 05/12/09
Posts: 4196
Loc: Canada
Originally Posted By: RTBandit
Just curious - Does 91 octane gas create a hotter explosion than 87 octane? All input is appreciated.


It's not an explosion, it's a burn.
Or it should be!

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#1825273 - 03/21/10 01:36 AM Re: Does premium unleaded burn hotter than regular [Re: RTBandit]
Trajan Offline


Registered: 07/16/05
Posts: 3577
Loc: SE PA
Octane rating does not relate to the energy content of the fuel. It doesn't burn any hotter.
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#1825331 - 03/21/10 06:27 AM Re: Does premium unleaded burn hotter than regular [Re: Trajan]
Boomer Offline


Registered: 09/19/08
Posts: 1723
Loc: Pennsylvania
Some cars had warnings years ago on running high octane fuels as they were set to use regular. The reason given was burning exhaust valves. This was not due to higher temps but to a slightly longer burn time that produced a hotter exhaust gas that caused the exhaust valve to run hotter. My wife's Saturn has a warning like this in the owner's manual and I think Buick may have had it as well.
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#1825352 - 03/21/10 07:04 AM Re: Does premium unleaded burn hotter than regular [Re: Boomer]
Bluestream Offline


Registered: 09/13/03
Posts: 4362
Loc: Waterloo, ON
It burns slower, so my guess is it would be cooler
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#1825375 - 03/21/10 07:48 AM Re: Does premium unleaded burn hotter than regular [Re: Bluestream]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 9023
Loc: N.H, U.S.A.
Is this on a bet? Having a Molotov Cocktail? If you want more energy out of a cylinder burn you have to add MORE fuel and MORE air. Or Nitrous (air) and more fuel. Not enough air will make the burn too hot.
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#1825381 - 03/21/10 08:00 AM Re: Does premium unleaded burn hotter than regular [Re: RTBandit]
zulu Offline


Registered: 01/21/08
Posts: 528
Loc: Kansas
Not hotter, just slower.
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#1825383 - 03/21/10 08:02 AM Re: Does premium unleaded burn hotter than regular [Re: ARCOgraphite]
cjhepburn Offline


Registered: 02/24/09
Posts: 251
Loc: Boston
I don't know if it burns hotter but it burns slower. That's why you need to adjust the timing on older cars to not ping on lower octane fuels.
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#1825384 - 03/21/10 08:03 AM Re: Does premium unleaded burn hotter than regular [Re: Bluestream]
Jax_RX8 Offline


Registered: 12/13/06
Posts: 345
Loc: Northern VA, USA
Originally Posted By: Bluestream
It burns slower, so my guess is it would be cooler


This is a mistake many people think - just because it is less prone to pre-ignite, through additives, does NOT mean it burns slower.

Once ignited, Premium burns at basically the same rate as Regular.


Edited by Jax_RX8 (03/21/10 08:04 AM)

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#1825405 - 03/21/10 08:40 AM Re: Does premium unleaded burn hotter than regular [Re: Jax_RX8]
mikered30 Offline


Registered: 09/10/05
Posts: 1331
Loc: PA
So running 93 octane in an engine that calls for 87 will not lead to increased carbon build up compared to running 87 all the time?

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