offshorexcursion

iTrader: (5)

Does the 90 non ethonal have valvtect addative? Our local fuel engineer claims the valvetect addative in 90 non ethonal measures 92 octane but for some reason they can not list that on the pump. He also claims its one of the only adatives approved worldwide.

http://www.valvtect.com/

There are a few of us running that fuel instead of the 93 that our toys require, with success fwiw.

BUP

iTrader: (9)

Deleted info - totally wrong thoughts on my part

Coolerman

E10 would be closer to 14.0 rather than straight gas at 14.7. Straight is ethanol 9.0.

Although E10 will lean out your motor a bit, the ethanol runs cooler and you have a bit higher octane.

We put race E85 in our truck on the way back from LOTO hauling the Black Thunder and there was good difference in performance. On the other side of things though, the truck did not like the E85 in cold early winter weather with no load.

There is no doubt that ethanol has it's advantages, but it definitely has its disadvantages.

One thing about ethanol (or methanol) is that it does mix with gas just fine. The issue is that gas will not mix with water, but ethanol (and methanol) will absorb water. That's where the phase separation comes in. If you have a sealed barrel of E85 with no moisture, it should not settle over time.

BUP

iTrader: (9)

Deleted info - finally I got with the program.

MILD THUNDER

iTrader: (3)

It doesn't run richer. Basically if let's say with straight gas the engine makes best power at 12.5:1 air fuel. To make best power with E10, you'd be seeing 12.0 on your wideband at max power, according to the chart I posted at least. The only way to get there , is adding more liquid (fuel) quantity.

you would want to go with larger jets in a carb with E10 than you would straight gas. That's why alcohol jets are so big. An engine making 1000hp on alky would require a larger volume of fuel than gasoline. So when you replace a percentage of pure gas with alcohol, you need to richen it up (add more volume)

So if your marine engine is safe at 12.5 Afr with straight 93 gas, and you run ethanol 93 at 12.5 Afr, you may have an issue. Ideally you'd want to see 12.0 on your wideband to compensate for the ethanol.

This very well could be the reason on the dyno, we were seeing marine supercharged engines making their best HP with an AFR in the 11.5 AFR range with E10 93. Leaner lost power, richer lost power. I also read that ethanol mixed fuel, likes timing advance.

Interesting for sure. I'm trying to learn all this fancy stuff. Im still playing with carb jets in the dark ages.

BUP

iTrader: (9)

I understand it after I looked at the whole chart and understood what it was all about afterwards - I had to rethink what the chart really was. My bad, trying to be to smart for my own good. Hopefully you can see where I was coming from as one untouched engine then comparing the two fuels. Sorry for the mix up.

BUP

iTrader: (9)

Jason possible the E-85 RVP totally different not the standard spec in the cold like winter gas would be. just saying.

I understand the chart now and if you remember Tim (Rocket Brand Fuel ) at PRI threw out some of the same #'s as to another way how I finally got it after the fact.

MILD THUNDER

iTrader: (3)

As far as the OP, with 600sc mercs, I'd run the ethanol 93. Mercs jetting was usually on the fat side to begin with , so should be safe. Although, I'd highly recommend an O2 sensor in the exhaust to dial things in. And try to resist the interwebs general opinion of leaning it out to what a Honda civic is safe with for fuel ratios.

BUP

iTrader: (9)

Will add this has been in testing phase since 2010 and BRP and Volvo Penta have done a lot of testing with it. They like it and so does the NMMA. it was even used and being tested at the Miami Show. I have a report on it testing in the marine world. It was very favorable. Possible look for marinas or some form of it being able to put in your fuel tank down the road.Link below.

http://www.boatingmag.com/isobutanol...src=soc&dom=fb

jmackin

iTrader: (1)

Yes it does, but I was told it only raises it 2 decimal points, could be wrong though. So it would be 90.2