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#11422490 - 02/18/16 09:29 AM Fuel Question
Der Vorsteher´┐Ż Offline
TFF Guru

Registered: 02/11/11
Posts: 22085
Loc: The 903
There was a post about Vmax 150s yesterday. I noted that I put premium in my tanks but someone else mentioned that it burned too hot and could blow a head. What are halls thoughts? I thought premium was just cleaner and burned better. Should I stick with regular and just keep adding the Stabil?

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#11422508 - 02/18/16 09:35 AM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
Chris B Online   content
TFF Celebrity

Registered: 05/02/03
Posts: 7210
Loc: Prosper, TX
That motor doesn't require higher octane for the compression ratio, so it is best to run regular in it.
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#11422513 - 02/18/16 09:36 AM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
Frank the Tank Offline
TFF Guru

Registered: 02/27/13
Posts: 20758
Loc: Rockwall & a lake somewhere
Yes, regular gas and a fuel additive like stabil or ring free etc.
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#11422517 - 02/18/16 09:36 AM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
buda13 Online   happy


Registered: 07/02/04
Posts: 17722
Loc: NRH, TX
My boat mechanic has always told me the same thing, higher octane burns hotter which is not a good thing in outboard engines.
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#11422525 - 02/18/16 09:42 AM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
Outdoordude Online   happy
Extreme Angler

Registered: 04/20/09
Posts: 2068
If the engine doesn't specify that you need to use a higher octane, then don't.

Get fuel from busy stations (this helps ensure that the fuel is fresh) and put some kind of stabilizer in each tank and you'll be fine, and save a lot of money.

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#11422540 - 02/18/16 09:47 AM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
ezbassin Offline
TFF Guru

Registered: 01/15/04
Posts: 12911
Loc: Mansfield, Tx.
Higher octane DOES NOT burn hotter, that is false information, but your motor is designed to run on regular fuel so use that along with additives like those suggested above.


Edited by ezbassin (02/18/16 09:49 AM)

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#11422561 - 02/18/16 09:56 AM Re: Fuel Question [Re: buda13]
fouzman Offline
Methuselah

Registered: 01/20/09
Posts: 45854
Loc: Houston, TX
Originally Posted By: buda13
My boat mechanic has always told me the same thing, higher octane burns hotter which is not a good thing in outboard engines.


Your mechanic is FOS, Matt. Higher octane does not burn "hotter". High-octane fuel is needed for higher compression ratios in high performance engines. My SHO calls for 89 octane which is a real PITA because very few stations outside the city carry it. So I have to use 50/50 regular/super most of the time.
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#11422574 - 02/18/16 09:59 AM Re: Fuel Question [Re: fouzman]
shotgunwilly Offline
Pro Angler

Registered: 06/22/08
Posts: 769
Originally Posted By: fouzman
Originally Posted By: buda13
My boat mechanic has always told me the same thing, higher octane burns hotter which is not a good thing in outboard engines.


Your mechanic is FOS, Matt. Higher octane does not burn "hotter". High-octane fuel is needed for higher compression ratios in high performance engines. My SHO calls for 89 octane which is a real PITA because very few stations outside the city carry it. So I have to use 50/50 regular/super most of the time.


Huh? I've seen 89 octane at almost every gas station I've ever been to. Rural or not.

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#11422584 - 02/18/16 10:03 AM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
fouzman Offline
Methuselah

Registered: 01/20/09
Posts: 45854
Loc: Houston, TX
Most around Fork that I have visited have regular and premium. Some have only regular.
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#11422585 - 02/18/16 10:04 AM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
buda13 Online   happy


Registered: 07/02/04
Posts: 17722
Loc: NRH, TX
That would be the first time my guy has ever been wrong! roflmao nuts
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#11422593 - 02/18/16 10:08 AM Re: Fuel Question [Re: buda13]
Chris B Online   content
TFF Celebrity

Registered: 05/02/03
Posts: 7210
Loc: Prosper, TX
The guys above are correct. Higher octane means it ignites slower. Keeps the engine from having preignition from higher compression ratios. Premium fuel does tend to carbon up engines that are designed to run on regular. A carboned up engine can run hotter than normal.
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#11423107 - 02/18/16 01:40 PM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
propman Offline
Angler

Registered: 04/06/10
Posts: 446
Loc: Pilot Point, TX
I have a '98 Champion with a '98 Merc. 175 H.P. EFI I bought it used in '99 from a guy who told me he used premium gas in it. I have been using premium with fuel stabilizers since then and have had zero problems with it. Only replaced the hoses once in that time as well due to the deterioration caused to them by the unleaded fuel.

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#11423141 - 02/18/16 01:55 PM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
Fast Lane Offline
TFF Celebrity

Registered: 07/24/06
Posts: 5790
Loc: Tyler, texas
Octane has absolutely nothing to do with how hot it burns. The air/fuel ratio, ignition timing and several other factors determine the heat of combustion.

Octane is merely the fuels measured ability to resist detonation.

Robert Lane
Fast Lane Nitrous Racing Systems
http://www.fastlanenitrous.com

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#11423167 - 02/18/16 02:03 PM Re: Fuel Question [Re: fouzman]
Fast Lane Offline
TFF Celebrity

Registered: 07/24/06
Posts: 5790
Loc: Tyler, texas
Originally Posted By: fouzman
Originally Posted By: buda13
My boat mechanic has always told me the same thing, higher octane burns hotter which is not a good thing in outboard engines.


Your mechanic is FOS, Matt. Higher octane does not burn "hotter". High-octane fuel is needed for higher compression ratios in high performance engines. My SHO calls for 89 octane which is a real PITA because very few stations outside the city carry it. So I have to use 50/50 regular/super most of the time.


Just put super unleaded in it. That will not hurt anything. Just gives a little more detonation resistance. And costs a little more.

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#11423181 - 02/18/16 02:06 PM Re: Fuel Question [Re: Der Vorsteher´┐Ż]
361V Online   content
TFF Team Angler

Registered: 11/21/08
Posts: 4582
Loc: somervell county
No no no no. True story: The other day I stopped by a gas station owned and operated by a middle eastern fellow. They were out of regular unleaded but he said its OK because the premium gets better gas mileage so the extra cost will pay for itself. roflmao roflmao roflmao Now if you have a higher performance(higher compression) engine that SPECIFIES high octane fuel you will experience pinging(preignition) if you do not use the higher octane it specifies. That will lead to engine problems. If you have an engine like your outboard that SPECIFIES 87 octane you are simply paying more for your fuel with NO added benefit to mileage or performance. Some cars require higher octanes. My sisters Nissan Maxima states right on the car "89 octane" which is midgrade. It's not always available which has been a pain in their @$$ since buying the vehicle. They literally mix regular w/premium any time mid grade is not available. Strait primium is too expensive. They would have never purchased it if they would have known. My brother-in-laws quote: "it ain't a Ferrari"! People all assume our newer outboards are "high performance" or higher compression. They are manufactured and TUNED to burn the fuel they are labeled for: 87 octane or "regular" for our convenience and readily available fuel. :-)


Edited by 361V (02/18/16 02:38 PM)
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