Recent Topics
lucas
by mobilaltima
09/25/16 07:13 AM
Mixing polar and non-polar base fluids
by Jetronic
09/25/16 05:51 AM
Anyone ever own a Land Rover Series 2 or 3?
by Gasbuggy
09/25/16 05:38 AM
liquimoly diesel purge
by nyumski
09/25/16 05:22 AM
Castrol 0w40 vs Motul XCess 8100 5w40 base oil
by NocturnalG
09/25/16 01:39 AM
Finding My Biological Father
by john_pifer
09/25/16 12:15 AM
Engine Oi Tips for all buddies out here
by kestrelong
09/24/16 11:52 PM
Virgin Napa Pro Select 21522
by Farmer
09/24/16 11:45 PM
Virgin Napa Gold 1348
by Farmer
09/24/16 11:43 PM
Virgin Napa Pro Select 27145
by Farmer
09/24/16 11:41 PM
Wix 57145, 268 Hours
by Farmer
09/24/16 11:40 PM
Forester XT filter ok on Tribeca?
by dx92beater
09/24/16 11:08 PM
Newest Members
MurrayBrown, fubarud, soulblade, swoodhall, Sonja
59185 Registered Users
Who's Online
52 registered (car51, Al, Astro_Guy, BobFout, bugeye, bbhero, 7 invisible), 1159 Guests and 15 Spiders online.
Key: Admin, Global Mod, Mod
Forum Stats
59185 Members
66 Forums
254904 Topics
4186584 Posts

Max Online: 2862 @ 07/07/14 03:10 PM
Donate to BITOG
Page 1 of 6 1 2 3 4 5 6 >
Topic Options
#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.

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


Registered: 04/11/04
Posts: 3374
Loc: los angeles
The numbers are just ratings for the level of resistance to detonation,it is not an indicator of "performance"
_________________________
THIS SPACE FOR RENT, PLEASE PM ME.

Top
#1825260 - 03/21/10 01:14 AM Re: Does premium unleaded burn hotter than regular [Re: daves66nova]
Colt45ws Offline


Registered: 08/15/06
Posts: 8875
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)
_________________________
-Colton
2002 Ford Crown Vic PI, 190k "Highwayman"
Ex-Kootenai County, ID Unit #42
Maxlife 5W20
Lubegard Bio/Tech oil treatment
Ultra XG2

Top
#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.

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


Registered: 05/12/09
Posts: 5117
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.

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


Registered: 12/12/02
Posts: 33915
Loc: Oz
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.
_________________________
2003 Navara 3.0Di - Edge 5W30/25W50
1997 Caprice L67 - Magnatec Stop Start 10W30

Top
#1825272 - 03/21/10 01:35 AM Re: Does premium unleaded burn hotter than regular [Re: RTBandit]
expat Offline


Registered: 05/12/09
Posts: 5117
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!

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


Registered: 07/16/05
Posts: 3730
Loc: SE PA
Octane rating does not relate to the energy content of the fuel. It doesn't burn any hotter.
_________________________

Lack of harm is not proof of benefit.

There are in fact two things, science and opinion; the former begets knowledge, the later ignorance. Hippocrates





Top
#1825331 - 03/21/10 06:27 AM Re: Does premium unleaded burn hotter than regular [Re: Trajan]
Boomer Offline


Registered: 09/19/08
Posts: 1817
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.
_________________________
2013 VW Passat TDI SE, 35,500 miles
2014 VW Jetta TDI SportWagen 18,455 miles

Top
#1825352 - 03/21/10 07:04 AM Re: Does premium unleaded burn hotter than regular [Re: Boomer]
Bluestream Offline


Registered: 09/13/03
Posts: 5236
Loc: Waterloo, ON
It burns slower, so my guess is it would be cooler
_________________________
2000 Cavalier 2.2 A4
2000 VW Beetle 1.8T M5
2000 Ford Explorer 4.0 4X4
1991 BMW 735iL
"A fool and his money are soon parted" - Thomas Tusser

Top
#1825375 - 03/21/10 07:48 AM Re: Does premium unleaded burn hotter than regular [Re: Bluestream]
ARCOgraphite Offline


Registered: 05/17/09
Posts: 10175
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.
_________________________
2014 Nissan Rogue S CVT, OC#4 19671mi-Castrol EDGE EP 5W30+Nissan 15208-9E01A Filter
2015 Forester 6MT 5Door, OC#6 41243mi-M1EP 0W20+Subaru Filter

Top
#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.
_________________________
09 Silverado 5.3 -> M1 5W-30/AC Delco PF48
12 Civic Si 2.4 -> Honda (CP Blend) 0W-20/Honda A02

Top
#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.
_________________________
'08 Civic LX, M1 EP 5w-20, 10000 OCI - 98k.
'03 Forester XRS, GC 0w-30, 5000 OCI - 78k

Top
#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)

Top
#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: 1429
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?

Top
Page 1 of 6 1 2 3 4 5 6 >