No Premium Fuel at Lake Powell solution

[kodiak]

So at the bullfrog marina in Lake Powell the only fuel is 87 octane,
which is what we have to put in our house boat toy tank.
I was worried about how I was going to get 93 (550 engine), although 91 works at this elevation.
But instead of having to lug 50 gallons of 98 octane and mix it with the 87 I saw this,
http://www.boostane.com/

Now I can fill up the G21 with 46 gallons of 87 and put around two quarts of this stuff and it will make it 93.
Sounds like the only side effect is a slight orange residue on the exhaust and spark plugs with continued use.
I only see myself using about 6 quarts a year so I'm not to worried. Would rather have that then a motor pulling
timing and have the potential of pre detonation.

[nyryan2001]

Kodiak- I am kinda in the same situation. Understand that Boostane costs $25 a quart....so you are paying $50 extra a tank to bring 87 up to the 91-93 range?

I did the same thing, and was able to do it with good results for $10 extra a tank. I did a full review over on the Malibucrew, here it is, good luck.

OK, time to report back on using the Shellbourne Fuel Enhancer ($20 a bottle....roughly 1/2 bottle per 65gal tank ish = approx $10 per tank extra to treat) ....not to be confused with Shellbourne custom mixed octane boosters, which are much more expensive, for racing applications, just too pricey for the amount of fuel our boats consume. Good for racing 4 wheelers or snow sleds etc.
BLUF - I would use this enhancer if I was concerned about having access to poor quality ethanol water fuels..... or the current fuels available made my engine knock.... OR if kept the boat on a lift, and only 87/89oct was available on the lake and my engine spec'd 91/93oct. This enhancer reduces negative effects of the ethanol and water in the fuels, raises the octane 2-3 points, and provides better lubrication. And at about $8-10 extra a tank, isnt entirely out of line price wise when you look at the .30-70 cent cost difference/gal from 87oct to 93oct over 50-60 gallons, its cheaper just to get 89oct and use this product for solid 91oct+ performance.
I used one $20 bottle, half of it in two tanks each back to back... and performance was flawless for both. Again, my engine requires 93oct. First tank was 1/3 leftover 91oct from last fall(93oct isnt avail in Oklahoma)... and I topped it off with 87oct and 1/2 bottle of the fuel enhancer. The boat ran perfectly the entire tank, heavily weighted for surfingat 3300rpms. Smooth. No indications of pulled timing or less power on the cheapie 87oct gas.... again... my 550hp specs 93oct.
The second tank was 91oct with the other 1/2 bottle of the Shellbourne fuel enhancer.... same results, very smooth engine running experience.
Full disclosure: I ran 91oct with 10% ethanol last year and noticed no ill effects, 93oct just isnt available here. So I am not able to say the 2nd tank is miraculous. However, running 87oct in a 93 spec application and not percieved power loss whatsoever... certainly deserves consideration.
So if you are worried about cruddy fuels in your boat, ethanol and the water it brings, layup over winter and stabilization, higher octane fuels needed for your engine specs are not available consider this fuel enhancer.
http://shellbournefu.../fuel-enhancers

[kopp210]

Why is the 93 a must for the engine? Is it an octane rating timing, ignition, temperature thing? Or is it an ethanol blending thing?

I do the best I can but sometimes run 91, think even used 89 on the water when there was no other option. Should I be packin some of the above product on my next lake trip?


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[Laketexoma]

If you have the supercharged LS 550 hp they need the higher octane. With boost these engines need it for predetionation.

[mike32]

Have you thought about xylene? Sold at lowes, cheap. Used it for years with by supercharged lightning when racing to prevent detonation and increase octane. Google it!

[nyryan2001]

Thermodynamics PV=NRT
As compression ratios (P pressure)go up for a given volume V in high performance engines, T temps go up and the fuel can pre-detonate in the cylinder and knock.

But it the funny thing here is the 550 has the LOWEST compression ratio in the lineup! Even lower than the 350!!?? 450 has a substantially higher compression ratio.

even more interesting, the 550hp Version of the outboard engine, made by Seven Marine only requires 87 octane!!

Jeff- do you think you could set up a Q&A with the lead engineers at PCM like you did with Bill Yargin?

[Laketexoma]

I think part of it is the intake air is hotter since it is compressed. Which will increase the cylinder temp. I know on my wife's boosted JK we are running a inter cooler but still have to run 93 in it.

[dihrdskir]

Thermodynamics PV=NRT
As compression ratios (P pressure)go up for a given volume V in high performance engines, T temps go up and the fuel can pre-detonate in the cylinder and knock.

But it the funny thing here is the 550 has the LOWEST compression ratio in the lineup! Even lower than the 350!!?? 450 has a substantially higher compression ratio.

even more interesting, the 550hp Version of the outboard engine, made by Seven Marine only requires 87 octane!!

Jeff- do you think you could set up a Q&A with the lead engineers at PCM like you did with Bill Yargin?

The figure quoted is static compression. A forced induction engine requires lower compression and increased cylinder volume over an aspirated engine to prevent detonation. There are exceptions such as LPG (propane) fuelled engines or older (dirty) engines which required lead added fuels of greater than 100 octane.

[kopp210]

I think part of it is the intake air is hotter since it is compressed. Which will increase the cylinder temp. I know on my wife's boosted JK we are running a inter cooler but still have to run 93 in it.

From running a moto bike back in the day I know 103 runs a lot cooler than 93. You could feel the difference on your legs.


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