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Old 07-22-2013, 05:41 PM   #1
Polarbear
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Default unleaded vs super unleaded

anyone notice a massive difference between using either of these on the rc51?
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Old 07-22-2013, 05:58 PM   #2
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Good question! Although I have only ever used Super.
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Old 07-22-2013, 06:03 PM   #3
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Premium Shell or BP is what I try to keep in my girl but if you are in the middle of no fucking where California, 87 works too.
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Old 07-22-2013, 06:13 PM   #4
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wondering if it would smooth out my fuelling any, if i go up to super
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Old 07-22-2013, 06:38 PM   #5
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Smooth it out...no, keep the detonation to a minimum, yes.

The manual calls for premium gas.
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Old 07-22-2013, 07:02 PM   #6
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Quote:
Originally Posted by madbuyer View Post
Premium Shell or BP is what I try to keep in my girl but if you are in the middle of no fucking where California, 87 works too.
Yeah, in a pinch! till you can get more premium gas back into the tank.

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Originally Posted by Polarbear View Post
wondering if it would smooth out my fuelling any, if i go up to super
I think the octane rating system may be different for Polarbear in Scotland?

Our gas in the US is pretty sorry compared to what Europe and Australia get, from what I understand. But if we're talking about US gasoline, the service manual says 91 octane. The highest we get is 91 here in CA. So that's what I run.
Don't run a lower octane than what the manual for your country recommends. Performance will definitely suffer, your engine is built to run premium gas.
That gets me wondering, what's the stock compression on our bikes?
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Old 07-22-2013, 07:06 PM   #7
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10.8:1
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Old 07-22-2013, 07:11 PM   #8
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As I recall stock compression is somewhere around 10.5, which isn't as high as it could be; but this depends on the cam durations too. The longer the duration (of open) the more compression - usually.

US & European Octane ratings are measured differently (I think it's detailed on Wikkipedia, etc. if interested), so the US rating show as lower than European, but the gap in resistance to pre-ignition isn't as much as most people think.
As an example I see Turbocharged performance cars that are meant to run in Japan on 100 RON & owned by US Military on bases here, be filled up with US 91 RON and they run just fine too.

But yeah, I still put in 100RON Japanese premium fuel in my bike all the time. It's about 6% more expensive but what the hell! The VFR & my other bikes run 95 RON regular. I believe the UK is 99-97 RON premium (Depends on where you buy from) and 95 RON regular.
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Old 07-22-2013, 07:12 PM   #9
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Quote:
Originally Posted by madbuyer View Post
10.8:1
Weeeeeeee!!!
Yeah, I wouldn't run much 87 octane unless i had some serious tuning done to accommodate it. But I'm no expert on that, don't have personal knowledge, just what I've been told over the years.
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Old 07-22-2013, 07:23 PM   #10
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I have run 87 92 and 100LL(av gas)

I didnt notice any difference between them! I run 87 pretty regularly, No problem!
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