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Fuel CBF 500

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Just in Case
Derestricted Danger



Joined: 25 Apr 2021
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PostPosted: 06:11 - 09 Jun 2021    Post subject: Fuel CBF 500 Reply with quote
Hi there!
About fuel and level of octane
I`m on 95 octane on my 2004 Honda and are considering 98
Do you run 98 octane ?
What is in that case your experience?
Cheers!
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trevor saxe-coburg-gotha
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Joined: 22 Nov 2012
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PostPosted: 06:58 - 09 Jun 2021    Post subject: Reply with quote
It's designed for 95 iirc - it'll run on 98 and you might - MIGHT - even be able to tell a difference, but I doubt it. It'll just cost more.
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Kawasaki Jimbo
World Chat Champion



Joined: 09 Oct 2015
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PostPosted: 08:10 - 09 Jun 2021    Post subject: Reply with quote
It will make the seat more comfortable, improve FM reception and make the sun shine too. Placebo effect. Enjoy!
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Bloggsy
Spanner Monkey



Joined: 08 Feb 2010
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PostPosted: 08:45 - 09 Jun 2021    Post subject: Reply with quote
98 Octane ? a complete waste of money
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xX-Alex-Xx
World Chat Champion



Joined: 12 Sep 2019
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PostPosted: 09:22 - 09 Jun 2021    Post subject: Re: Fuel CBF 500 Reply with quote
Justin Case wrote:
Hi there!
About fuel and level of octane
I`m on 95 octane on my 2004 Honda and are considering 98
Do you run 98 octane ?
What is in that case your experience?
Cheers!


Whatever your manual says to run. Putting in higher octane is just a waste of money - remember higher octane doesn't mean more power, it means it'll take more compression before igniting/detonating.
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Easy-X
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Joined: 08 Mar 2019
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PostPosted: 11:12 - 09 Jun 2021    Post subject: Reply with quote
Ah so you have a high revving, high compression race machine! No? Then I have some magic beans to sell you Wink
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Just in Case
Derestricted Danger



Joined: 25 Apr 2021
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PostPosted: 12:52 - 13 Jun 2021    Post subject: Reply with quote
Hi : Cool
Interesting!
Have any of you really Tried? Guess Not! Smile

My manuel say minimum 91 .... that`s all!
I had no probs with 95 But the engine was a little unhappy especially on low rpm easy going, just cruising!

After 98 came on the engine purres like a cat, beautifully!
I am "lower" on the throttle all over and the fuel conumption came down from a little under 0.5 liters- to 0.43 liters/10 km.

95 contains 5% Ethanol which 98 does not!
95 has a lower "limit" before self-ignition (during compression) than the 98!
I guess that`s why the engine runs more smoothly on 98.

So I found the benefits going 98 reasonable and it fits my reseach and testing! Very Happy Money? Probably a little more .. but not very much! Smile

Have a Nice summer ya all, ride safe and enjoy!
Cheers !
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xX-Alex-Xx
World Chat Champion



Joined: 12 Sep 2019
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PostPosted: 16:19 - 13 Jun 2021    Post subject: Reply with quote
Justin Case wrote:
Hi : Cool
Interesting!
Have any of you really Tried? Guess Not! Smile

With the number of experienced riders on here, I can guarantee the answer is yes. I've tried it myself both in the car and on multiple bikes and the only difference was the cost of the fill up

Quote:

95 has a lower "limit" before self-ignition (during compression) than the 98!
I guess that`s why the engine runs more smoothly on 98.

Cheers !


Yes, that's what octane does. And the same reason you're wasting money if you're running it higher than needed. If your engine only needs 91 but only runs well on 98, I'd look into the reason for that and fixing it. For example: caked on carbon in the cylinders.
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Kawasaki Jimbo
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Joined: 09 Oct 2015
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PostPosted: 16:54 - 13 Jun 2021    Post subject: Reply with quote
I’ve tried it too. What’s happening is you’re riding around with a new focus, looking for reasons to justify your “discovery.”

“How’s my fuel economy now? Better give it a chance, make it a fair comparison, choose the right gear, not wring it’s neck.”
Quote:
I am on lower throttle everywhere.
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stinkwheel
Bovine Proctologist



Joined: 12 Jul 2004
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PostPosted: 20:49 - 13 Jun 2021    Post subject: Reply with quote
I doubt it has a knock sensor so it's unlikely to make much difference.

It might have a slightly higher detergent content and have dislodged bits of dirt from your fuel system.
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GettinBetter
Crazy Courier



Joined: 20 Jun 2019
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PostPosted: 13:37 - 14 Jun 2021    Post subject: Reply with quote
Justin Case wrote:
...
95 has a lower "limit" before self-ignition (during compression) than the 98!


This means the 98 has a HIGHER 'limit' and allows a higher compression ratio to be used without the fuel pre-igniting before the spark plug ignites the fuel.
As others have said, use the book value unless you or someone else has raised the compression ratio, above standard.

Having said that, I always use the higher grade.... just coz I gauge anything above 10:1 or 160PSI to be high compression. Can't remember when I arrived at that, but it was back when I used to burette the combustion chambers and divide into the volume to work out the compression ratio I'd achieved by rebores and head skimming.
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MCN
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Joined: 22 Jul 2015
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PostPosted: 15:13 - 14 Jun 2021    Post subject: Reply with quote
Bloggsy wrote:
98 Octane ? a complete waste of money



Says you.

Higher Compression in an internal combustion engine gets a bigger bang from the fuel when it is detonated by a spark.

Higher Compression in an internal combustion engine will cause fuel to self detonate and reduce power and damage the engine.

To allow higher compression the fuel is doped with octane improvers (previously Tetraethyllead).

The timing of the spark needs to be adjusted to a different position too.

Some modern petrol engines can detect self detonation and adjust the spark timing.

That function allows the engine to get the advantage of a higher compression fuel.

It's all magic.

I use super 97 98 RON in both of my using bikes.
They are specifically able to detect knock and adjust sparks to suit.
And the power difference is well noticeable.

Trackside fuel is 98. That's what I bought at Donnington and Cadwell Park.

Whether cost effective is debatable and would require extensive detailed and reliable investigations.
But... I don't live on these bikes, like to use all power available so the extra £0.36/4.5L tank full (Tesco unleaded @ £1.279 super @ £1.359). Is no real burden to me.

Thermodynamics suggest higher energy fuel provides more work done per unit. Roughly speaking.


The 95 RON species goes in my 57 BSA.

This outfit has some handy info on current evidence and the argument.

https://www.petrolprices.com/guides/

I use the app to find cheapest fuel when out and about. I don't save 1000s but I'd rather not pay some cunch of bunts for the forecourt stuff I'm not interested in.

I just cleared my ars sat nav which has a fuel tracker/cost calculator based on 'styles of driving'.

I spent £1700 over the past 18 months on Feckin' supermarket DERV. Shocked

With about 60+% of that going to the Chanceror of the Exchequer, Risky Sunpak's kids school fees.
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xX-Alex-Xx
World Chat Champion



Joined: 12 Sep 2019
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PostPosted: 18:04 - 14 Jun 2021    Post subject: Reply with quote
MCN wrote:
Bloggsy wrote:
98 Octane ? a complete waste of money



Says you.

Higher Compression in an internal combustion engine gets a bigger bang from the fuel when it is detonated by a spark.

Higher Compression in an internal combustion engine will cause fuel to self detonate and reduce power and damage the engine.

To allow higher compression the fuel is doped with octane improvers (previously Tetraethyllead).

The timing of the spark needs to be adjusted to a different position too.


We're talking about a almost 20 year old CBF500... Not a modded race bike with high compression and aggressive timing.

The OP was obviously only after everyone to say "oh yeah if you don't run 130 octane your bike will die" anyway.
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Easy-X
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PostPosted: 18:16 - 14 Jun 2021    Post subject: Reply with quote
Makes me wonder if there are petro-chemical company shills wandering forums and Social Media keeping these myths alive. Brace yourself for more of this stuff as while E10 is coming in on regular AFAIK premium stays as E5.
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Nobby the Bastard
Harley Gaydar



Joined: 16 Aug 2013
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PostPosted: 18:27 - 14 Jun 2021    Post subject: Reply with quote
Easy-X wrote:
Makes me wonder if there are petro-chemical company shills wandering forums and Social Media keeping these myths alive. Brace yourself for more of this stuff as while E10 is coming in on regular AFAIK premium stays as E5.


No, there are lots of people who assume more expensive is better for all applications.
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MCN
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PostPosted: 20:29 - 14 Jun 2021    Post subject: Reply with quote
xX-Alex-Xx wrote:


We're talking about a almost 20 year old CBF500... Not a modded race bike with high compression and aggressive timing.

The OP was obviously only after everyone to say "oh yeah if you don't run 130 octane your bike will die" anyway.


I responded to a 'makes no odds' comment.

I never commented on the OP.
Wink

Although my comment does partially address the OP's
query a little.
But not enough ink on t'internet to explain hydrocarbon fuels and qualities thereof.

FTR. I do not have a highly modded anything.

All of my shite works exceptionally straight out the wrapper. Cool
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Just in Case
Derestricted Danger



Joined: 25 Apr 2021
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PostPosted: 10:57 - 18 Jun 2021    Post subject: Reply with quote
Smile
Great!
There is only one thing that matters. The way my "old" engine (lol,-04, 34000km)) run on 98 compared to 95 makes this a no brainer!
(the fact, no theory)
I will try 95 later on to check this out for sure though!
BTW, I`ve been riding since -72 , just in case....! Wink
Thanks for every comment anyhow! (some interesting and some not so) Cool
I just wanted to hear any experiences in this matter.
Have Fun, stay alive and enjoy the summer!
Cheers!
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