#11
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I run 91 in mine for the fact it's the only thing you can buy around here that's ethanol free, I trailer and always buy at the fast stations locally that I've had good luck with. 91 octane is still cheaper than diesel for for my truck so I don't notice the money difference
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#12
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![]() The marina where my slip is lewisville,tx only sells 93 octane but its only 50 cents more than going rate of premium so about 4.50 which is not too bad I have 04 x2 and can fill up and go all day at 100 bucks.
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#13
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I am guessing that my LT-1 recommends 89, but she runs just fine on 87. There is a gas station just up the road from me that has no ethanol 87 so that is usually what I put in it. It is about 20 cents more than regular with ethanol, but to me it's worth it to get more gas in your tank.
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#14
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Quote:
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Love my boat, hate my trailer. |
#15
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Simple rule, higher compression ratio, higher octane. Older engines, under 10:1 can typically run 87. If there no engine issues, and gas is of good grade. I typically run 89, in my Expedition and boat. Both will run will on 87. My MC 205 is a 9.5:1 engine. I usually run 89. I figure 89 is the most sold product, so in theory, could be a more consistant quality. Also, gas in Oklahoma seems to work better, and usually cheaper, than East Texas. Go figure. ![]()
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2004 Red/White/Black something or other. ![]() Formally, 1994 RED Mastercraft 205, Chevy 5.7 TBI. |
#16
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The LT1 has a 10.4-1 compression ratio, even with reverse cooling I wouldn't run 87 in it unless all you do is put around at idle or cruise
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1981 MasterCraft 19' Skier 351W PowerSlot Long gone is the Trans AM ![]() |
#17
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Even with the detonation sensor dialing the timing back it's still pushing things in the wrong direction using 87.
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#18
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Quote:
http://forum.roadfly.com/threads/126...ctane-gasoline There was also an exposé on Canadian TV before Christmas on a show called marketplace. http://www.cbc.ca/marketplace/episod...ump-facts.html
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2014 X-14V 2012 X-14V (gone) |
#19
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Hello all mostly a lurker on here. I have some experience with octane and performance engines as I run A boosted Mustang at the dragstrip That requires greater than 91 octane fuel.
In short lower octane fuel actually burns faster then high octane fuel so running the lowest octane fuel possible without detonation (pinging or worse) will yield the best performance. My "race car" which is really a street legal car I race requires 96 octane. Here in utah 91 at the pump is all you get but for a few places that sell 100 octane. I run a fuel additive called Torco accelerator. 32 oz into 10 gal of 91 makes 96. 32 oz into 20 gallons will easily net you 2 or more octane points. The point is if you were somewhere and needed a little insurance for octane this works well. If you buy it 5 gal at a time you can buy it for $250 or 12.50 per 32 oz. It's alot easier then hauling around gas cans full of 93 or 91 if required. It is unleaded and 02 sensor safe, I have run it in my car for at least 6 years with no negative effects on emissions equipment. Just a suggestion. |
#20
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Another thing to consider. Engine Nut, who works for Indmar, once posted here that the reason Indmar called for 89 octane was due to the fact that most people use their boats infrequently. 87 octane is fine, but 86 is not. So, to avoid having people fill up with 87, then leave the boat sitting for a month or two between uses and starting it up with what was no longer 87 octane fuel, Indmar recommended 89 octane so that there would be a little buffer for less frequent users.
I think it is a good idea to stabilize any fuel you don't intend to burn off in the next two weeks before that last outing of the weekend.
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