08-12-2010, 12:09 AM | #1 |
Join Date: Aug 2010
Posts: 26
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X31 octane?
Is it necessary to run 91 octane on the 2010 x31?
The engine I thought had a compression ratio of 9:1 which I'm positive only requires 87 octane.. But I'm not sure. I ask this because I have a whole shitload of lawnmower gas in a jerry can that would be perfect for my girlfriends gio, 10 liter tank filled right up for her to have, which is only a couple weeks old. She can keep the tank and the gas and I don't have to buy another one taking up space in the garage... So has anyone ran 87 in their x31 with an overhead cam engine (2010) with no pinging? |
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08-12-2010, 01:03 AM | #2 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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I wouldn't.
I know that logic tells us that 87 would be fine, but that's based upon accurate specifications. Dump the jerry can fuel in the truck and buy some good stuff for the bike. It's a little harder to start high octane fuel, but it burns a little cooler.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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08-26-2010, 11:00 PM | #3 |
Join Date: Nov 2009
Location: montreal
Posts: 242
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i all ways run 94 octan in my 200cc beast
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2008 gio beast 200cc mod list YTX14-BS battery mod,gy6 carb 250cc,custom intake,125cc cf dirtbike muffler,MPR filter/intake,performance cdi,ngk iridium xi dpr8eix-9,performance coil pack and wire, pro taper handle bar, Gio air shocks, yam swing arm bus |
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08-26-2010, 11:05 PM | #4 |
Join Date: Aug 2010
Location: austin, tx
Posts: 1,452
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atv and dirtbike motors are supposed to run high octane gas only..93 to race gas..ive been thinking about buying a half gallon of some 103 race gas and seeing how the quad runs on it..
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08-27-2010, 12:27 AM | #5 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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That's only with high compression engines. Good luck starting a Beast on 103.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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08-27-2010, 01:12 AM | #6 | |
Join Date: Aug 2010
Location: austin, tx
Posts: 1,452
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Quote:
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08-27-2010, 08:56 AM | #7 |
Join Date: Feb 2008
Location: Terrell and Grapevine Tx.
Posts: 1,585
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I think the owners manual with my bike says not to run premium gas. Not sure that it would hurt anything though.
If an engine runs without detonation on regular gas, a higher octane wont add any performance. |
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08-27-2010, 10:26 AM | #8 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Exactly my understanding of octane ratings.
If you have a high compression engine and you have the ignition timing retarded to combat detonation, premium will allow you to properly advance the timing and take advantage of the compression. Otherwise, high octane fuel in a low compression engine is just expensive. That said, I do run 94 in my Beast. It starts without too much trouble, and 94 doesn't burn as hot as regular. I give my little Beast every longevity advantage I can.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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08-28-2010, 08:18 PM | #9 |
Join Date: Aug 2010
Posts: 26
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Running a higher octane can actually hurt performance because the compression on the head may not be good enough to fully ignite it.
Going to try some 87 tomorrow on it. If I hear any kind of pinging I'll stop it and roll it back to the truck and drain it out. I'll report back with my findings. |
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08-29-2010, 01:49 AM | #10 | |
Join Date: Sep 2008
Location: Surrey, B.C., Canada
Posts: 2,185
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08-29-2010, 02:22 AM | #11 |
Join Date: Aug 2010
Location: austin, tx
Posts: 1,452
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my quad ran freshly dumped steaming in middle of winter poopie when i ran 87 in it..
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08-29-2010, 01:06 PM | #12 | |
Join Date: Jul 2010
Posts: 100
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Re: X31 octane?
Quote:
But that also could have more to do with taking the intake part, and reinstalling the gaskets and spacer right side up, instead of upside down, which blocked a good section of the intake. And gasket-sealing them before I reinstalled. And replacing the plug and wire... I'm betting 87 octane would be fine |
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08-29-2010, 06:23 PM | #13 |
Join Date: Aug 2010
Posts: 26
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Dumped 3.9L of 87 in the bike yesterday and had it ideling fine for about 10 minutes solid. Bike was plenty warmed up and I started to give it a little bit of throttle and noticed no difference at all between this gas and the 91 I was using.
Going to take it out in a couple hours for an actual ride with the GF, so we'll see how it runs under load and more heat. Will update when I know more. So far 87 seems to be fine. |
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08-07-2011, 11:53 AM | #14 |
Join Date: Aug 2011
Location: HV-GB, Labrador, Canada
Posts: 17
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Anyone tried running 100LL AVGAS at all?
I used to get it for my 79 5.0L Mustang years ago and it purred like a kitten. Just wondering as I can still get my paws on it up here too. |
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08-07-2011, 12:49 PM | #15 |
Join Date: Mar 2009
Location: Sardis, BC, Canada
Posts: 25,977
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Good luck getting the engine to start with octane that high.
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Weldangrind "I figure I'm well-prepared for coping with a bike that comes from the factory with unresolved issues and that rewards the self-reliant owner." - Buccaneer |
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