RE: octane rating

CBR Forum Classifieds News Photo Gallery Search Member List Timeslips Contact Sponsors Register Login

RE: octane rating

Printable Version

CBR Forums >> General >> General Tech >> RE: octane rating

Page: << < prev 1 [2] 3 next > >>

Message

<< Older Topic Newer Topic >>

RE: octane rating - 11/12/2004 9:41:24 PM

Dragon

Posts: 100
Joined: 11/5/2004
Status: offline

Sounds like a Kodak moment....LOL....

(in reply to chainstretcher)

Post #: 16

RE: octane rating - 11/14/2004 7:48:10 PM

chainstretcher

Posts: 4150
Joined: 11/5/2004
Status: offline

Bwaaa -- it's all good dudes. A healthy debate on octane and how it affects your ride is a good thing. What turns peeps sour is when it gets to the "I have an engineer friend ..." stage. When my last bike (Busa) was stock, I couldn't run 87 octane even though that's what was in the manual. Peeps on the Busa boards said I was stoooooopid and the the Busa made more HP on 87. Well, I took what they said with a grain of salt because my particular ride knocked valves like a mofo when I used 87. And let me add that I used the 87 for several tanks before I gave up and started the 93 (87 knocked upon acceleration).

With the new 1kRR I just said screw it and run pure 93 baybee! She loves it!!! When the bike's happy, I'm happy!!

And if anyone wants the whole nine yards on octane, let me know. I've read and stored crap loads of info on the subject. The actual fact that matters most to me is how my bike runs. Period. Who cares about 1/2 horse at 15K rpms. That's all paper. The real world is what it's about.

< Message edited by chainstretcher -- 11/14/2004 7:49:21 PM >

(in reply to Dragon)

Post #: 17

RE: octane rating - 11/14/2004 11:03:16 PM

RTmotive

Posts: 71
Joined: 10/9/2004
Status: offline

1000rr huh, sweet. just got my 600rr a little while ago and it's fun. anyway, you should try running 87 just to see how it runs. i started out with 93 on my bike, but then thought i'd give 87 a try since it's what the manual recommended. it turns out that she runs fine on 87, so i just thought that since we both have modern hondas, maybe they could both run on similar gas. anyway, not trying to bust your balls or anything, just letting you know my results

(in reply to chainstretcher)

Post #: 18

RE: octane rating - 11/17/2004 2:51:53 AM

jake2004

Posts: 28
Joined: 10/1/2004
Status: offline

Anyone notice a difference between gas stations? I can run 87 at some gas stations but if i go to chevron i have to use 91?

_____________________________

98 900rr

(in reply to RTmotive)

Post #: 19

RE: octane rating - 11/17/2004 12:01:06 PM

sirlimpzalot

Posts: 1404
Joined: 8/24/2004
From: Roseville, CA
Status: offline

I havent really noticed a difference..and I get gas alot. I tend to un 91 octane all the time just because my bike is my baby and I want the best..even if it isnt required. Bikes dont hold enough fuel to warrant me buying the cheaper stuff..it might cost me a dollar more to use the good stuff. Now if my bike were a Suburban or something....87 ALL THE WAY!!!! (octane)Gas prices here in Californai is a out of hand!! 87 octane fuel is $2.25 a gallon for the cheap stuff around here

(in reply to jake2004)

Post #: 20

RE: octane rating - 11/18/2004 11:08:46 PM

RTmotive

Posts: 71
Joined: 10/9/2004
Status: offline

what do you mean? if you go to chevron, their 87 isn't any good? i haven't noticed any difference so far, but if i notice anything i'll let you know.

(in reply to jake2004)

Post #: 21

RE: octane rating - 11/19/2004 1:29:19 AM

jake2004

Posts: 28
Joined: 10/1/2004
Status: offline

I think it is that tecron crap they add in to make it burn clean. I reworked the fuel system on my 76 cj5 and within a month I noticed a large build up of rubber in my filters. All I ran was chevron and it started eating away at my rubber hoses. Switched to shell ran fine. As far as running chevron 87 in my bike it knocks like crazy but if I go to shell I can run 87 just fine.

_____________________________

98 900rr

(in reply to RTmotive)

Post #: 22

RE: octane rating - 1/24/2005 7:58:56 PM

T02F4i

Posts: 30
Joined: 1/23/2005
Status: offline

hey i was reading these posts about who's bike runs what octane and I actually looked it up in my owners manual and it says quote,
"Use of lower octane gasoline can cause persistant "pinging" or "spark knock"(a loud rapping noise) which, if severe, can lead to engine damage". Odd how other CBR's can run almost any octane and others have to run say 93. But it doesnt bother me any cause i was planning on putting 93 in mine. Is it just the newer bikes (2000+) that have to run higher octanes or are there earlier CBR that have to run higher octane?

Just curious?

-Tom-

(in reply to sirlimpzalot)

Post #: 23

RE: octane rating - 1/24/2005 8:13:26 PM

chainstretcher

Posts: 4150
Joined: 11/5/2004
Status: offline

The compression ratio of your bike will determine what octane you need. All octane rating means is resistance to detonation (pinging). At high revs and compression detonation will literally tear your engine apart. Rods that look like bananas are common.

Higher compression = more heat (Boyles Law), more heat = gas explodes in cylinder before spark (detonation), higher octane = resistance to heat induced detonation.

So, 11:1 or better in a high revving bike engine I recommend 93 -- if you're running NOS or a turbo then your compression will soar and you may have to run av-gas, water injection or an intercooler to keep things together.

_____________________________

It's better to burn out ...
Than high side!

(in reply to T02F4i)

Post #: 24

RE: octane rating - 1/24/2005 11:12:35 PM

Im1320

Posts: 17
Joined: 1/23/2005
Status: offline

R+M/2 . R=research method. M= I dunno.

The actual correlation is R+M/2, R=research octane, M=motor octane /2= add the 2 together and divide by 2 you get the PUMP octane

(in reply to chainstretcher)

Post #: 25

RE: octane rating - 2/6/2005 2:37:00 PM

954rider

Posts: 9
Joined: 2/2/2005
Status: offline

Bought an 02' 954. No owners manual. Can anyone advise what octain fuel is recomended for it?

(in reply to RTmotive)

Post #: 26

RE: octane rating - 8/27/2005 10:00:44 PM

Custom900

Posts: 52
Joined: 8/24/2005
Status: offline

I have a 900rr and run 93 octane with Lucus Octane booster. I always get spark knock when using 91 or less. Ive tried it all.

I guess that's what I get for porting, polishing, and changing out the ehaust can. There was other engine work done as well, but I have to keep all that a secret

_____________________________

Never resist the urge to RIDE

(in reply to 954rider)

Post #: 27

RE: octane rating - 8/28/2005 8:25:19 AM

mmookey

Posts: 351
Joined: 7/12/2005
From: Las Vegas, NV
Status: offline

Chain....Do you have a motorcycle encyclopedia in your head? Some of the technical knowledge that you have given to people is mind blowing. Do you wrench for a living or just read alot of books?

_____________________________

2004 Black CBR 1000RR
Two Brothers Slip-On Titanium V.A.L.E. muffler
BMC Street Air Filters
Flapper Mod
Powercommander III
Sato rearsets Type 2
CRG black shorty levers
43 teeth Driven rear sprocket
Speedo Heeler

(in reply to chainstretcher)

Post #: 28

RE: octane rating - 8/29/2005 5:09:56 AM

Anubis

Posts: 2159
Joined: 6/27/2005
Status: offline

When i got my bike it had an idiot sticker on the tank saying not to use anything less than 95 octane. So ?

_____________________________

Liverpool-UK

Bla Bla Bla - Just Ride It !!

(in reply to Im1320)

Post #: 29

RE: octane rating - 9/8/2005 7:05:17 AM

f4i_reborn

Posts: 177
Joined: 9/7/2005
From: Hacienda Heights, CA
Status: offline

about the gas stations yes... AVOID ARCO... they have clean air fuel additives that are no good for you and your 600 RR. BE WARNED!!!... lol actually that might be a myth but it sounds like it could be true.... anyone?

(in reply to Im1320)

Post #: 30