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Dec 30th, 2023
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 Re: Fuel Question
[Re: Fast Lane]
#11423183
02/18/16 08:07 PM
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Joined: Jan 2009
Posts: 50,040
fouzman
Methuselah
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Methuselah
Joined: Jan 2009
Posts: 50,040 |
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. I've done that, too.
"Things turn out best for those who make the best of the way things turn out" - Zachary Troy Schrah - a young man with vision far beyond his years.
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Re: Fuel Question
[Re: Der Vorsteher]
#11423635
02/18/16 11:31 PM
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Joined: Dec 2015
Posts: 644
TxRanger1
Pro Angler
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Pro Angler
Joined: Dec 2015
Posts: 644 |
The gas doesnt determine how hot it burns, the plugs do along with the air mixture. If you put the higher octane gas in an engine that is built for regular, it will not run as well. The reason being is that the engine doesnt burn all of the gas when it fires.
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Re: Fuel Question
[Re: Der Vorsteher]
#11423780
02/19/16 12:39 AM
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Joined: Nov 2010
Posts: 127
pro dirt raker
Outdoorsman
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Outdoorsman
Joined: Nov 2010
Posts: 127 |
Interesting read. Have been putting Premium in my 94 Johnson Venom 200 since I bought it, for no reason other than "premium must be better than regular"... Its notoriously a cold natured motor, I wonder if this only exasperated the problem by running premium.
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Re: Fuel Question
[Re: Der Vorsteher]
#11423942
02/19/16 01:49 AM
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Joined: Jan 2004
Posts: 16,862
ezbassin
TFF Guru
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TFF Guru
Joined: Jan 2004
Posts: 16,862 |
Those of you running premium in motors that are not designed for that fuel are wasting your money.
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Re: Fuel Question
[Re: Der Vorsteher]
#11423944
02/19/16 01:51 AM
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Joined: Jan 2009
Posts: 477
jiggmann
Angler
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Angler
Joined: Jan 2009
Posts: 477 |
I got a print out of how to break in my new power head it says use 89 octane only
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Re: Fuel Question
[Re: ezbassin]
#11424091
02/19/16 02:50 AM
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Joined: Nov 2010
Posts: 127
pro dirt raker
Outdoorsman
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Outdoorsman
Joined: Nov 2010
Posts: 127 |
What about Octane loss over time as the fuel sits in an open container with a vent (your boats fuel tank).
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Re: Fuel Question
[Re: Fast Lane]
#11424172
02/19/16 03:22 AM
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Joined: Nov 2012
Posts: 806
JimmyP
Pro Angler
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Pro Angler
Joined: Nov 2012
Posts: 806 |
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 What Fast Lane said. Without going into quench area, flame travel, etc..... You only need to run what the Manufacturer says to get the best performance out of your engine. Anything over that is a waste of money and could be detrimental to the engine as well. The cleaner your combustion is the better it is for any engine. No excess carbon build up to hamper ignition or cause hot spots or dirty up the oil and rings and ring lands
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Re: Fuel Question
[Re: Der Vorsteher]
#11424376
02/19/16 04:45 AM
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Joined: Dec 2008
Posts: 16,181
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,181 |
For the record... The guy that said that (the op's question) was told that by the skeeter service dept when he (I) bought his (my) boat. So what I'm reading here is... No damage can be done by running premium in a motor designed for 87? Or there is a slight possibility.
How about 89? Better than 87 or should I just keep using the 89? Been good to me so far; but if 87 is better then I might need to change.
Last edited by grout-scout; 02/19/16 04:47 AM.
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Re: Fuel Question
[Re: Der Vorsteher]
#11424435
02/19/16 05:26 AM
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Joined: Nov 2012
Posts: 806
JimmyP
Pro Angler
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Pro Angler
Joined: Nov 2012
Posts: 806 |
Grout if you use 89 or higher you probably won't see any short term ill effects. The problem will be in the long run with carbon build up and the wear associated with it. If your owners manual states 87 octane fuel then you will be as good with it as you can get so long as it's quality fuel. There is no need to spend the extra 40 cents a gallon or so on the higher octane fuels. The new motors are designed to run with the general fuel available to the public. The problem is the PCM will retard or advance the timing out of the designed optimum range if different fuel is used or change the injector pulse width to meet the parameters to which the Manufacturers have designed it to run. In the end you can use whatever you like with no short term effects as long as it's above the minimum required by the manufactor. I probably made this as clear as mud for you, sorry.
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Re: Fuel Question
[Re: Der Vorsteher]
#11424565
02/19/16 12:30 PM
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Joined: Nov 2008
Posts: 7,618
361V
TFF Celebrity
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TFF Celebrity
Joined: Nov 2008
Posts: 7,618 |
And your flux capacitor will implode!
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Re: Fuel Question
[Re: JimmyP]
#11424730
02/19/16 02:21 PM
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Joined: Dec 2008
Posts: 16,181
grout-scout
TFF Guru
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TFF Guru
Joined: Dec 2008
Posts: 16,181 |
Grout if you use 89 or higher you probably won't see any short term ill effects. The problem will be in the long run with carbon build up and the wear associated with it. If your owners manual states 87 octane fuel then you will be as good with it as you can get so long as it's quality fuel. There is no need to spend the extra 40 cents a gallon or so on the higher octane fuels. The new motors are designed to run with the general fuel available to the public. The problem is the PCM will retard or advance the timing out of the designed optimum range if different fuel is used or change the injector pulse width to meet the parameters to which the Manufacturers have designed it to run. In the end you can use whatever you like with no short term effects as long as it's above the minimum required by the manufactor. I probably made this as clear as mud for you, sorry.
 no I understand just fine. Thank you for explaining it, I'll try some 87 for now on.
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Re: Fuel Question
[Re: Der Vorsteher]
#11424774
02/19/16 02:43 PM
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Joined: Aug 2008
Posts: 47,421
Ride-or-Fish
TeTelesTai
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TeTelesTai
Joined: Aug 2008
Posts: 47,421 |
I truly have no idea about octanes, and the effects on internal combustion engines. I'm not science smart like that. I used to run VP race fuel U4 (oxygenated) fuel in my YZF's when I raced. It was a LOWER octane than pump fuel, and at the time I was also told it burned "cooler". Again, I didn't know.. didn't care. All I know is it offered crisper throttle response and smelled awesome. It was worth the $5 bucks a gallon back then when I had the scratch layin around.
Ephesians 6:10-18..suit up. Jesus saved my life
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Re: Fuel Question
[Re: grout-scout]
#11425010
02/19/16 04:36 PM
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Joined: Apr 2015
Posts: 6,885
04champ
TFF Celebrity
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TFF Celebrity
Joined: Apr 2015
Posts: 6,885 |
For the record... The guy that said that (the op's question) was told that by the skeeter service dept when he (I) bought his (my) boat. So what I'm reading here is... No damage can be done by running premium in a motor designed for 87? Or there is a slight possibility.
How about 89? Better than 87 or should I just keep using the 89? Been good to me so far; but if 87 is better then I might need to change. if your motor is designed for 87 you will see zero benefit from 89
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Re: Fuel Question
[Re: Der Vorsteher]
#11425465
02/19/16 08:05 PM
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Joined: Apr 2012
Posts: 555
Fritz423
Pro Angler
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Pro Angler
Joined: Apr 2012
Posts: 555 |
Heck, you can substitute 89 octane with 91 septane or 86 nonane.
Wishin' I was fishin', and dreaming of beer
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Re: Fuel Question
[Re: Der Vorsteher]
#11425693
02/19/16 09:52 PM
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Joined: Oct 2009
Posts: 450
jafish
Angler
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Angler
Joined: Oct 2009
Posts: 450 |
I use ethanol free gas in my rig plus in all my small engines like chain saw mower. I have never used any ethanol in my 225hp merc. so far. Just saying.
TAKE A PHOTO HOME NOT THE FISH. CATCH AND RELEASE
Set the hook first and ask questions later.
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