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100LL aviation fuel in a Mercury 300x
I'm just wondering if you can run 100LL in a 300x outboard? Any sensors that might be effected by the extra lead in the fuel? Do they run a catalytic converter? Thanks...
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100LL I believe stands for 100 octane Low Lead-- there isn't extra lead in the fuel-- it most likely is lead free.
What grade of fuel does the owners manual require- I would not do anything more than what is required by the manufacturer -- heck some engines can run on fruit fly urine - but that doesn't mean you will get any more performance out of it. Just as a side bar - I have a 7.4 MPI (310 hp). When I first got it I put in 92 octane - when I pulled the boat out I noticed a little soot on the transom - cleaned this up and the next fill up when to the required 87 octane - Not a hint of soot!! Because of the lower flash point of the higher octane fuel some of it wasn't burning ergo soot. In fact there was NO difference in speed/performance with the higher octane. I'm a firm believer that the engineers that developed these engine systems (in most cases) were a heck of a lot smarter than me!! just my 2cents 3pointstar |
Originally Posted by 3pointstar
(Post 4363714)
100LL I believe stands for 100 octane Low Lead-- there isn't extra lead in the fuel-- it most likely is lead free. It does have lead in it that is where some of the additonal octane comes from. Av-Gas is great stuff have run the stuff in all my 2 stroke turbo snowmobiles and they love it. Have to replace an O2 sensor maybe every 1000 miles, thats the only sensor I can see being affected if there is one.
What grade of fuel does the owners manual require- I would not do anything more than what is required by the manufacturer -- heck some engines can run on fruit fly urine - but that doesn't mean you will get any more performance out of it. Just as a side bar - I have a 7.4 MPI (310 hp). When I first got it I put in 92 octane - when I pulled the boat out I noticed a little soot on the transom - cleaned this up and the next fill up when to the required 87 octane - Not a hint of soot!! Because of the lower flash point of the higher octane fuel some of it wasn't burning ergo soot. In fact there was NO difference in speed/performance with the higher octane. This is a very good point, run the least amount of octane you need, higher the octane the more heat your engine/cooling system will need to get rid of. I'm a firm believer that the engineers that developed these engine systems (in most cases) were a heck of a lot smarter than me!! Dam straight, I cant tell you the amount of hrs we spend on the dyno trying to get as much hp out of an engine with the least amount of octane, if we say run 87 run 87 if we say run 91 well you better dam well run 91 (usally motor have knock sensors in them at that point for the idiot that runs 87). just my 2cents 3pointstar |
I'm looking for a non ethanol based fuel. Being a pilot, it's my best option. Does anyone know if a 300x, being fuel injected, will have a problem running 100LL?
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100LL Still has plenty of lead in it. I ran it in my carbed 540's with no ill effects, however I don't think I would run it in a modern day EFI engine.
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Originally Posted by jamontes
(Post 4363893)
100LL Still has plenty of lead in it. I ran it in my carbed 540's with no ill effects, however I don't think I would run it in a modern day EFI engine.
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Originally Posted by turbom700
(Post 4363726)
If your motor is bone stock then run what merc says, if you have different timing/fuel maps and you need to run more octane then 100ll is a good choice.
I don't know who posted the paragraph starting with Dam straight ......That WAS NOT me 3pointstar. I agree with his/her comment but it didn't come from me 3pointstar |
Originally Posted by 3pointstar
(Post 4363934)
I posted the paragraph starting with Dam straight ......That WAS me 3pointstar. I agree with his/her comment but it didn't come from me
3pointstar |
Originally Posted by turbom700 This is a very good point, run the least amount of octane you need, higher the octane the more heat your engine/cooling system will need to get rid of. I have a significant history running highly modified 2 strokes in the desert. The higher the octane the slower the burn and more resistant to detonation. your fuel charge actually burns it does not explode. Exploding is detonation. Higher octane also has less thermal energy. Higher octane is used because you can run higher compression, more ignition timing etc. Things that can possibly make more power, but also make the engine more susceptible to detonation. Higher octane alone will actually make less power. We used 112 octane fuel in the desert because it actually makes the engine run slightly cooler. |
Wow boating in the desert! That's a new one:lolhit:
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