cnote
Novice Class
Posts: 46
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posted November 07, 2007 10:59 AM
87 octane
why do most racers burn 87 octane
  
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Hawkman
Zone Head
Posts: 747
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posted November 07, 2007 11:01 AM
Burns hotter. Makes more power.
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Tool Man
Needs a job
Posts: 4493
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posted November 07, 2007 11:21 AM
 Edited By: Tool Man on 7 Nov 2007 11:24
quote:
Burns hotter. Makes more power.
I think.... It burns at the same temp, BUT the lower the octane the faster the flame front moves across the piston, hence faster flame = more powerful explosion. BOOM 
Big words :d http://pdf.aiaa.org/preview/CDReadyMASM04_665/PV2004_143.pdf
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brain
Expert Class
Posts: 136
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posted November 07, 2007 01:40 PM
Is there any dangers of running 87 octane in these high compression engines,like the dreaded pre mature detonation.
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shawnski
Pro
Posts: 1809
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posted November 07, 2007 03:20 PM
danger... 91 + octane factory recommended. read your sticker on your tank.
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Nelson Taylor
Zone Head
Posts: 927
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posted November 07, 2007 03:42 PM
Its safe. The lower octane the faster it burns.
Switch it up every now and then with 87, 89, or 93.
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4.03
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Tool man
Needs a job
Posts: 4493
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posted November 07, 2007 03:55 PM
quote:
Is there any dangers of running 87 octane in these high compression engines,like the dreaded pre mature detonation.
Yes there is, more so at low rpm's and large throttle openings. Stick with 91 0ctane and you will not have a problem. You will not feel much of a difference with 87 though it might give up a few more HP on the dyno. Want to go faster? How much do you weigh?
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stevewfl
Moderator
Posts: 27920
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posted November 07, 2007 04:26 PM
quote:
Want to go faster? How much do you weigh?
+1
best mod ever
jennycraig.com
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2010 Concours14
'08 R1 YAMAHA
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CBR600RR track bike
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ninja14
Pro
Posts: 1136
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posted November 08, 2007 06:28 PM
The factory has to worry about warranty work on a bike ridden by an idiot..............like uphill in 6th at 35MPH and 105* outside.
If you know how to ride a sportsbike then it's not a problem......revs are your friend.
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2006 Turbo ZX-14.
2005 V-max 20th Anniv.
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fastestbusaaround
Needs a life
I eat Fish...
Posts: 7889
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posted November 08, 2007 06:53 PM
Funny though,. the OM says you should shit into 6th at about 35MPH...what's that -- like 800 RPM?:LOL
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fastest-14
Expert Class
Fastest -14
Posts: 354
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posted November 08, 2007 08:01 PM
"cnote", I'm surprise to hear you say that most racers use 87 octane. I don't think so because most racers have modified high compression engines which requires higher octane. Even a regular street bike with head work and compression bumped up can't use 87 octane or Mr9. Octane's too low. On a built out street bike, depending on the compression, u have too use 93 octane, minimum. Race engines definitely needs MRX1 or Race gas for the track. It's all about compression and what minimum octane it takes to keep engine from detonating.
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dubious
Needs a life
Needs more time to ride!
Posts: 8442
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posted November 08, 2007 08:30 PM
I am in agreement with Fastest-14
However .....Take heed guys...
depending on where you live , but almost all winter fuels become degraded with oxygen additives, and butane which lower the flash point and octane,
The major fuel suppliers do this since it makes engines easier to start when cold, and they sell crap for the same $$$.
This situation will lead to detonation or pre ignition in winter months from fuel that ran good in the summer months. I have noticed this condition almost every September until May.
I have had to run 91+ octane rated fuel from september to may, when i could get away with 87 between June and August.
JFYI... and something to pay attention to......
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ZX11D
Zone Head
Internet Police
Posts: 674
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posted November 08, 2007 09:54 PM
Edited By: ZX11D on 8 Nov 2007 21:54
quote:
quote:
Is there any dangers of running 87 octane in these high compression engines,like the dreaded pre mature detonation.
Yes there is..........
Never experienced detonation on the 14, but my old 11 does not like 87 oct. at all .
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'94 ZX-11
'07 ZX-14
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Bently
Needs a life
2012 14r In Blue and no Mods!
Posts: 5428
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posted November 09, 2007 06:58 AM
I've used 87 in my ZX10 with a thin headgasket for raised compression and a little head work made 174 hp. I used it in my 14 and now my 08 Busa with no issues. All those bikes only ever use 87.
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