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What octane gas should I use
- Thread starter Roady
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timmyboy76
New Member
had same boat, for the extra 5 buks for full tank, i use 91
The only options I have are 87, 89, or 93 octane. I guess 93 is fine.
The engine is designed to run on 87 0ctane. If you have a stock engine and not a high compression, high performance engine, your just wasting you money. If the engine can't burn it, it just goes out the exhaust. If your engine pings than use higher octane to resolve it. If it doesn't it's wasted.
Karl
Karl
boeing747arowair
New Member
i agree with karl. for some reason with all the dam fuel issues these days. ive been pumpin 93 and adding stabil ethanol formula.! i want peace of mind not a gummed up or poor performing engine later on
Ethanol....
If you have to drive an extra 10 miles to get regular gas, you should. Ethanol (E85) is not designed to use in our ski/boats and will, in the long run, do a good bit of damage to your engine, any part of it that comes in contact with seals or any other teflon/rubber coated material...................use Gasoline!
If you have to drive an extra 10 miles to get regular gas, you should. Ethanol (E85) is not designed to use in our ski/boats and will, in the long run, do a good bit of damage to your engine, any part of it that comes in contact with seals or any other teflon/rubber coated material...................use Gasoline!
boeing747arowair
New Member
will these engines even run on E85? I was referring to E10. Down here in Miami i have yet to encounter a gas station sellin Gas without any contents of Ethanol. So although im pumpin E10 
. I still pumped premium with Stabiul Ethanol formula which reduces or eliminates the the damage that gas with E10 can produce.
. I still pumped premium with Stabiul Ethanol formula which reduces or eliminates the the damage that gas with E10 can produce.
I would stay away from E10...I have not found ANY information that seadoo' recommends running E10. If you read the post,you could run 115 octane it will not benefit your seadoos performance...just cost more and be higher flammable due to the larger percent of octane/ lower flash point.
I ran Cam 2 in my race ski's with a octane boost which made it equivalent to 125 octane. It was still barely race legal, and my engine had 225 psi compression, mod to the max. Yea, it didn't last long about 4 races...but damn it was quick! Pinged like crazy with even the slightest decrease. I went through $3000.00 engines (back in the 80's),like they were free(sponsored)...oh yea, they were.
Karl
I ran Cam 2 in my race ski's with a octane boost which made it equivalent to 125 octane. It was still barely race legal, and my engine had 225 psi compression, mod to the max. Yea, it didn't last long about 4 races...but damn it was quick! Pinged like crazy with even the slightest decrease. I went through $3000.00 engines (back in the 80's),like they were free(sponsored)...oh yea, they were.
Karl
Not without damage....
The research shows that if your vehicle has not been designed as an FFV vehicle, which means all the rubber "0" rings removed and a suitable substitute installed, then your likely to cause damage over the long haul.
There have been literally thousands of complaints lodeged to the government about the damaged vehicle fuel systems because the owners had extensive fuel damage from water that leached from the alcohol that makes up the flammable side of the E85. The other problems is, alcohol melts rubber. So, any parts in your fuel system exposed to the E85 will eventually damage it.
The auto industry has made advances in changes vehicles fuel systems, which they now lable as FFV vehicles which mean, they are certified to use E85.
The Rotax engines are not E85 certified and will likely see the destructive results in a year or so of constant burning of thie biofuel.
Below is a paste and copy of research I did a week ago from a couple sites on the internet that had answers to peoples complaints about the moisture damage to the sensitive parts of the fuel system that was damaged and alcohol melting other sensitive parts that sealed with rubber "0" rings.
In my opinion, I would not use any ethanol based products until a complete and throuogh study has been performed to prove to us it is safe for teh expensive fuel injection systems and sensors of our motors.
READ ON:.......... Depending on composition and source, E85 has an octane rating of 100-105 compared to a regular gasoline's rating of 85-93. So you can see right here that this fuel is not meant for the Rotax which states in the shop manuals to use 87 octane, 91 in the 4-TEC's. The higher octane rating will allow it to be used in higher compression engines which tend to produce more power per unit of displacement than their gasoline counterparts. Since the reciprocating mass of the engine increases in proportion to the displacement of the engine, E85 has a higher potential efficiency for an engine of equal power. What this means is any of the Rotax's that are modded out with extreme racing cranks etc....can use the E85 more efficiently than our stock motors. You can see this in drag racing. These drag boats use methanol, alcohol or some other type of alcohol blend.
One complication is that use of gasoline in an engine with a high enough compression ratio to use the E85 efficiently would likely result in catastrophic failure due to engine detonation, as octane rating of gasoline is not high enough to withstand the greater compression ratios in use with an engine specifically designed to run on E85. So this too is proof that our engines are not equipped to run the higher combustion it takes to completly burn the fuel.
It is a proven fact already that E85 has a lower mile per gallon rating than gasoline.
One of the biggest reasons for us to switch to a biofuel was the environment, outside the fact that we need to start finding alternative fuel sources. Scientists first thought that biofuels were good for the environment because it had a smaller carbon footprint, which might be true. But, the production of grain alcohol itself is not environmentally sound. Burning it is but making it isn't.......
All my research comes from websites off the internet. The material above was summarized therefore, not cited. I am still gathering information that I will eventually use in "Snipes Korner" but for the moment, it seemed a good idea to throw a little into this thread.
Bottom line,.......I don't care if I have to drive an extra 25 miles for pure gas, I will. The only way I'll burn E85 in my vehicles, lawnmowers, or Seadoo's is if the government leaves me no choice
will these engines even run on E85? I was referring to E10. Down here in Miami i have yet to encounter a gas station sellin Gas without any contents of Ethanol. So although im pumpin E10
The research shows that if your vehicle has not been designed as an FFV vehicle, which means all the rubber "0" rings removed and a suitable substitute installed, then your likely to cause damage over the long haul.
There have been literally thousands of complaints lodeged to the government about the damaged vehicle fuel systems because the owners had extensive fuel damage from water that leached from the alcohol that makes up the flammable side of the E85. The other problems is, alcohol melts rubber. So, any parts in your fuel system exposed to the E85 will eventually damage it.
The auto industry has made advances in changes vehicles fuel systems, which they now lable as FFV vehicles which mean, they are certified to use E85.
The Rotax engines are not E85 certified and will likely see the destructive results in a year or so of constant burning of thie biofuel.
Below is a paste and copy of research I did a week ago from a couple sites on the internet that had answers to peoples complaints about the moisture damage to the sensitive parts of the fuel system that was damaged and alcohol melting other sensitive parts that sealed with rubber "0" rings.
In my opinion, I would not use any ethanol based products until a complete and throuogh study has been performed to prove to us it is safe for teh expensive fuel injection systems and sensors of our motors.
READ ON:.......... Depending on composition and source, E85 has an octane rating of 100-105 compared to a regular gasoline's rating of 85-93. So you can see right here that this fuel is not meant for the Rotax which states in the shop manuals to use 87 octane, 91 in the 4-TEC's. The higher octane rating will allow it to be used in higher compression engines which tend to produce more power per unit of displacement than their gasoline counterparts. Since the reciprocating mass of the engine increases in proportion to the displacement of the engine, E85 has a higher potential efficiency for an engine of equal power. What this means is any of the Rotax's that are modded out with extreme racing cranks etc....can use the E85 more efficiently than our stock motors. You can see this in drag racing. These drag boats use methanol, alcohol or some other type of alcohol blend.
One complication is that use of gasoline in an engine with a high enough compression ratio to use the E85 efficiently would likely result in catastrophic failure due to engine detonation, as octane rating of gasoline is not high enough to withstand the greater compression ratios in use with an engine specifically designed to run on E85. So this too is proof that our engines are not equipped to run the higher combustion it takes to completly burn the fuel.
It is a proven fact already that E85 has a lower mile per gallon rating than gasoline.
One of the biggest reasons for us to switch to a biofuel was the environment, outside the fact that we need to start finding alternative fuel sources. Scientists first thought that biofuels were good for the environment because it had a smaller carbon footprint, which might be true. But, the production of grain alcohol itself is not environmentally sound. Burning it is but making it isn't.......
All my research comes from websites off the internet. The material above was summarized therefore, not cited. I am still gathering information that I will eventually use in "Snipes Korner" but for the moment, it seemed a good idea to throw a little into this thread.
Bottom line,.......I don't care if I have to drive an extra 25 miles for pure gas, I will. The only way I'll burn E85 in my vehicles, lawnmowers, or Seadoo's is if the government leaves me no choice
robin savell lloyd
Active Member
It does not seem that we have much of a choice here in florida do we? United States
(states where mandatory)
Florida E10 Minnesota E10
Hawaii E10 Missouri E10
Iowa E10 Montana E10
Kansas E10 Oregon E10
Louisiana E10 Washington :cheers:
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boeing747arowair
New Member
well there is a big difference between E10 and E85. Down here in Miami all ive seen is E10 at every gas station. So like i said, if have no other choice so i continue to pump E10 with Stabil Ethanol Stabilizer to see if that protects my engine. I WANT REGULAR 100% Premium Gas Back not this corn crap!. Anyways, I just filled up and am using stabil for the first time ill let you know later on tonight when i get home. Off to cruisin the ICW
Moisture seperator...?
Yes, there is a 5% content difference between th E85 and E10. With the actual numbers representing the total amount of ethanol by volume shown after the "E"...........
We still use regular octane fuel here in the South east. You can purchase the corn stuff at some selected outletts. It's usually $.0.10 cents a gallon cheaper than the real McCoy.
If you live in an area where you haven't got much choice, I"d honestly suggest you look at a water seperator. Today’s ethanol-blended fuels increase the chances of water in fuel tanks, resulting in premature wear, poor performance and component damage. Contaminants of over 10 micron size also can cause severe damage with the close tolerances of today’s fuel pumps and injectors. That is why a high efficiency water separating filter is so important.
I might recommend the use of the Sierra fuel/water seperator. It uses a 21 micron screen to filter off the water and smaller contaminates that might otherwise get through our inline filter. Check out the link................ http://www.westmarine.com/webapp/wc...URL=true&storeNum=6&subdeptNum=78&classNum=90.
Yes, there is a 5% content difference between th E85 and E10. With the actual numbers representing the total amount of ethanol by volume shown after the "E"...........
We still use regular octane fuel here in the South east. You can purchase the corn stuff at some selected outletts. It's usually $.0.10 cents a gallon cheaper than the real McCoy.
If you live in an area where you haven't got much choice, I"d honestly suggest you look at a water seperator. Today’s ethanol-blended fuels increase the chances of water in fuel tanks, resulting in premature wear, poor performance and component damage. Contaminants of over 10 micron size also can cause severe damage with the close tolerances of today’s fuel pumps and injectors. That is why a high efficiency water separating filter is so important.
I might recommend the use of the Sierra fuel/water seperator. It uses a 21 micron screen to filter off the water and smaller contaminates that might otherwise get through our inline filter. Check out the link................ http://www.westmarine.com/webapp/wc...URL=true&storeNum=6&subdeptNum=78&classNum=90.
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boeing747arowair
New Member
lucky for me my optimax comes with one from the factory :-D!
You have a misconcetion that water leaches out of the ethanol that causes the propblems, its not the water in the ethanol its the ethanol that asorbs the water out of the gas that most states with warmer climates get away with selling you more water in the gas than normal.
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