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Old 06-03-2013, 11:11 AM
Hatch7 Hatch7 is offline
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Fuel Question

First time out was Memorial Day weekend the boat (93 Prostar with std 351) ran great. When I winterized I had filled the tank with 93 octane. As the weekend progressed new fuel was added which I found later to be 87 octane. After the refill she started sputtering when dropping the throttle at the hole shot. The boat now has a full tank of the cheap stuff. The question is: Does anyone have any experience with adding octane boosters? Would it be recommended or not? I'm sure it could be something else but fuel seems to be the likely culprit since she ran great out of the gate.

Thanks,
Hatch
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  #2  
Old 06-03-2013, 11:32 AM
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CantRepeat CantRepeat is offline
 
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Quote:
Originally Posted by Hatch7 View Post
First time out was Memorial Day weekend the boat (93 Prostar with std 351) ran great. When I winterized I had filled the tank with 93 octane. As the weekend progressed new fuel was added which I found later to be 87 octane. After the refill she started sputtering when dropping the throttle at the hole shot. The boat now has a full tank of the cheap stuff. The question is: Does anyone have any experience with adding octane boosters? Would it be recommended or not? I'm sure it could be something else but fuel seems to be the likely culprit since she ran great out of the gate.

Thanks,
Hatch
They are all snake oil and not worth your money.

Unless someone has done a lot of work on that engine you are kind of wasting your money running 93.

Did you put any kind of fuel stabilizer in when you winterized?
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  #3  
Old 06-03-2013, 02:51 PM
Hatch7 Hatch7 is offline
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Originally Posted by CantRepeat View Post
They are all snake oil and not worth your money.

Unless someone has done a lot of work on that engine you are kind of wasting your money running 93.

Did you put any kind of fuel stabilizer in when you winterized?
I have heard mixed reviews on the additives but most are in the snake oil camp. What about Marvel Mystery Oil? I know nothing about it's composition but could that help or hurt?

I do use Stabil on a regular basis both during the season and the appropriate amount for winterization.
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Old 06-03-2013, 11:50 AM
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SP Maristar SP Maristar is offline
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I used to use it on my Porsche 944 Turbo and it really helped smooth out the motor. It is already a fantastic motor design with counter rotating balance shafts, but the higher octane with the turbo made it even better. Not sure how much a non turbo motor would benefit.
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  #5  
Old 06-03-2013, 11:56 AM
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Table Rocker Table Rocker is offline
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Was is sputtering or pinging/detonating? Lower octane causes detonation in higher compression engines.

Where did you get the gas that you later found to be 87? Could it have been old gas? Gas that sat in a can for a while, gas that sat in a marina's tank over the winter?
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Old 06-03-2013, 02:55 PM
Hatch7 Hatch7 is offline
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Originally Posted by Table Rocker View Post
Was is sputtering or pinging/detonating? Lower octane causes detonation in higher compression engines.

Where did you get the gas that you later found to be 87? Could it have been old gas? Gas that sat in a can for a while, gas that sat in a marina's tank over the winter?
I usually make it a practice to use all the gas before we leave or fill all the equipment and boats etc and add stabil but some could have been left and inadvertantly used. Fortunately for my wallet we go avoid the marina fuel.
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Old 06-03-2013, 03:23 PM
Hatch7 Hatch7 is offline
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Quote:
Originally Posted by Table Rocker View Post
Was is sputtering or pinging/detonating? Lower octane causes detonation in higher compression engines.

Where did you get the gas that you later found to be 87? Could it have been old gas? Gas that sat in a can for a while, gas that sat in a marina's tank over the winter?
Someone went out to pick up the gas so if there was old gas in one of the tanks we use or condensation it could have caused the problem.

There was no sputtering or pinging just the delay and some coughing. As long as I go slow at the start it doesn't seem to happen.
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Old 06-03-2013, 12:00 PM
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east tx skier east tx skier is offline
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Run 89 in that motor as recommended in the manual and keep it stabilized (even during the season unless you are burning through a tank every two weeks). You could siphon off the gas and use it in cars or lawn equipment or you could add some 93 back to whatever is left of the 87.

2 parts 87 to 1 part 93 = 89.
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Old 06-03-2013, 12:33 PM
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CantRepeat CantRepeat is offline
 
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Quote:
Originally Posted by east tx skier View Post
Run 89 in that motor as recommended in the manual and keep it stabilized (even during the season unless you are burning through a tank every two weeks). You could siphon off the gas and use it in cars or lawn equipment or you could add some 93 back to whatever is left of the 87.

2 parts 87 to 1 part 93 = 89.
Doug,

Everything I've read says 87 for 351w/302 and that's all I ever ran in my 92. I guess it's just a matter of how long it sits before use and whether or not that it was stabilized.
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  #10  
Old 06-03-2013, 02:15 PM
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TxsRiverRat TxsRiverRat is offline
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I use 87 with no issue. I do not use additives of any kind.
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