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Old May 29th @ 01:28 pm   #11
Got2Go's Avatar
 
From: Las Vegas[Summerlin]
Quote:
Originally Posted by dodinaslay View Post
Hi I am Dodinas Lay. I am from Pakistan. I really very happy to join this forum for disucssion. I found this forum very interesting and informative about discussed topics. I like it.
Hi Dodindas,

Welcome to the forum.

Now get the hell out with your spam crap.

Thanks!

Quote:
Originally Posted by ridethebigone View Post
Who the fuck is this guy ^ ?

Modern sportbike engines have high compression ratios (10.5:1 and up) and therefore need high octane fuel (91) in order to operate as designed. Due to the knock sensor (and others), lower octane fuel (87) can be used. When you do this the ECU retards (haha) the timing so that the fuel isn't compressed as much before being ignited, therefore preventing self ignition from the high pressure/temperature, but also limiting the potential of the engine (by how much, not a lot, need a dyno to verify). I personally wouldn't use less than 91 octane in an engine with 10:1 or more compression. Plus, 91 is only $0.20 more per gallon than 87, and you're using how many gallons? Worth the extra cheese.

Always use whatever the manufacturer recommends in terms of octane.
(unless you have made modifications to your engine that change the compression ratio)
But, you can go down in octane rating at higher elevations, like here.

The manufacturer recommended octane is based at sea level.
Here in LV, you can go to 89 if the manufacturer specifies 91.

Obviously, if you go lower in octane, and it knocks/pings, then bump back up.

 
 
Old May 30th @ 06:20 am   #12
ridethebigone's Avatar
 
From: Vegas

Motorcycle: 2004 CBR600RR (track only now) '79 Yamaha XS650 (The Savage Beast!)
Quote:
That guy is someone who's been around a lot longer than either of us, and simply copy and pasted something he thought was useful while claiming no personal expertise in the area.

But people will choose to do what they choose to do, for the reasons that they themselves have. The book says 87 for me, and since I'm a commuter bike looking for cheap gas, 87 it is.

But when comparing the cogency of your arguments, I'm gonna have to go with the article on this one. It seems like they put a little more science and effort into it.
I was talking about that dodinaslay jerkoff from pakistan who posted right above me... fuck pakistan, terrorist harboring asswipes.
 
 
Old May 30th @ 11:51 am   #13
MarvelousMatt's Avatar
 
From: Northwest

Motorcycle: Kawasaki Ninja 250R
Quote:
Originally Posted by ridethebigone View Post
I was talking about that dodinaslay jerkoff from pakistan who posted right above me... fuck pakistan, terrorist harboring asswipes.
Typical spam account. Spam Spam Spam Spam Spamly SPAM!
 
 
Old May 30th @ 06:28 pm   #14
Green_Dragon's Avatar
 
From: North Las Vegas

Motorcycle: 2006 Kawasaki ZX10R/2008 Kawasaki Vulcan 1600 Nomad
I like SPAM.
 
 
Old May 30th @ 07:56 pm   #15
 
From: henderson
I'm not so sure about the lower octane at higher elevation. Drove a 15 passenger van to the north room of the grand canyon once and it hated the shitty gas they sell in St. George. I thought the tranny was falling out as we climbed the mountains because the van shook and shuddered so bad. It ran a lot better after we filled it up with premium fuel we got in Arizona. Utah gas (85 octane there) sucks.
 
 
Old May 30th @ 11:08 pm   #16
Got2Go's Avatar
 
From: Las Vegas[Summerlin]
Quote:
Originally Posted by infidl View Post
I'm not so sure about the lower octane at higher elevation. Drove a 15 passenger van to the north room of the grand canyon once and it hated the shitty gas they sell in St. George. I thought the tranny was falling out as we climbed the mountains because the van shook and shuddered so bad. It ran a lot better after we filled it up with premium fuel we got in Arizona. Utah gas (85 octane there) sucks.
It's not a theory. It's fact.
Air density is less at higher elevation.
The combustion chamber will never reach the pressure it was designed for, and for which the octane rating was specified. And even then, that is at full open throttle, as that's he only time the combustion chamber will reach its maximum pressures.

I bet your issues where somehow else.
 
 

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