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Re: 99 Octane Fuel (RON) - worth it? [Re: rcmatt] #674329
23/11/20 01:48 PM
23/11/20 01:48 PM
Joined: Mar 2010
Posts: 2,768
Petersfield, Hampshire
Ian Wegg Offline
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Ian Wegg  Offline
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Joined: Mar 2010
Posts: 2,768
Petersfield, Hampshire
Originally Posted by rcmatt
Somehow people always translate higher octane equals more power.

That is not true.

A quick Google search for "octane and performance" brings up plenty of evidence that it is true, at least to an extent. If you want some heavy reading try downloading the PDF report here: Effect of Octane on Performance, Energy Consumption and Emissions of Two Euro 4 Passenger Cars

Quote: "The best agreement between performance and fuel octane number was found using an Octane Index [(1-K).RON + K.MON] with a K-value of minus 0.6 or even more negative.".

So now you know.

Re: 99 Octane Fuel (RON) - worth it? [Re: rcmatt] #674330
23/11/20 01:52 PM
23/11/20 01:52 PM
Joined: Oct 2012
Posts: 2,490
Furry Boots City
RedThree Offline
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RedThree  Offline
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Posts: 2,490
Furry Boots City
Originally Posted by rcmatt
Somehow people always translate higher octane equals more power.

That is not true.

Octane is simply a measurement that indicates how quickly the petrol will ignite. Higher octane ignites slower than lower octane. When vaporized fuel is put under pressure with ambient heat it will eventually ignite. That is how a diesel engine works. So higher compression engines need higher octane fuel or they will pre-ignite.

Now it is often the case that higher compression engines are also higher performing, or have more power. But that is because of the engine, not the octane of the fuel. If you put high octane fuel into a YUGO, you still only have a yugo.

Basically true and at one time simply true. In these days of electronic engine management, knock sensors and such like you are likely to find that an engine will give more power and better mileage on higher octane fuel as the feedback loops will alter various parameters to give best running on the fuel being fed into the engine. Can make a big difference on turbocharged engines, generally less of a difference on naturally aspirated.
Did do some testing on bike engines on a dyno a long time ago and we found that the super unleaded of the day made for something like an improvement of 2% on power over normal unleaded but this was on highly tuned by car engine standard engines. Also found that one brand of octane booster made a similar difference on top of that 2%. Can't honestly remember which brand it was but it was based on toluene.

Re: 99 Octane Fuel (RON) - worth it? [Re: IMHO] #674675
25/11/20 04:27 PM
25/11/20 04:27 PM
Joined: Nov 2013
Posts: 1,790
Aberdeenshire
T
TimG Offline
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TimG  Offline
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T

Joined: Nov 2013
Posts: 1,790
Aberdeenshire
I did run super unleaded for several tanks full on my standard engine with just the bafflectomy. I did not notice any performance advantage & a very slight reduction in fuel consumption but not enough to offset the higher fuel cost. Now I use regular unleaded E5.

Re: 99 Octane Fuel (RON) - worth it? [Re: IMHO] #674735
25/11/20 07:55 PM
25/11/20 07:55 PM
Joined: May 2012
Posts: 1,615
Gods own county! Oop north
D
Dab of oppo Offline
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Joined: May 2012
Posts: 1,615
Gods own county! Oop north
Easily get 40 mpg with Tesco Motillium 99 and it’s a sensible price.

Re: 99 Octane Fuel (RON) - worth it? [Re: IMHO] #675095
27/11/20 10:46 PM
27/11/20 10:46 PM
Joined: May 2019
Posts: 64
Logan, Ohio USA
D
Dutch Offline
Just Getting Started
Dutch  Offline
Just Getting Started
D

Joined: May 2019
Posts: 64
Logan, Ohio USA
My mechanic recommends putting in 100 octane fuel when I put the car away for the winter. He contends that's better than any of the gas treatments. It'll start right up in the spring. He puts that in any gas engines that he stores over the winter. I can get it at one local station here. The only problem is it's $ 7.00 a gallon !


Dutch Junge
194 Mound St
Logan, OH USA 43138
Re: 99 Octane Fuel (RON) - worth it? [Re: IMHO] #675097
27/11/20 10:51 PM
27/11/20 10:51 PM
Joined: Jul 2018
Posts: 660
M3W55 Offline
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M3W55  Offline
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Joined: Jul 2018
Posts: 660
That's a good price for 95 octane fuel over here!

Re: 99 Octane Fuel (RON) - worth it? [Re: IMHO] #675099
27/11/20 10:57 PM
27/11/20 10:57 PM
Joined: Mar 2015
Posts: 874
London uk
rockabilly john Offline
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rockabilly john  Offline
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Joined: Mar 2015
Posts: 874
London uk
Just a thought, has anyone tried Avgas LL 100 octane???

Re: 99 Octane Fuel (RON) - worth it? [Re: Dutch] #675101
27/11/20 11:05 PM
27/11/20 11:05 PM
Joined: Feb 2019
Posts: 2,896
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
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Joined: Feb 2019
Posts: 2,896
Port Orchard, WA.
Originally Posted by Dutch
My mechanic recommends putting in 100 octane fuel when I put the car away for the winter. He contends that's better than any of the gas treatments. It'll start right up in the spring. He puts that in any gas engines that he stores over the winter. I can get it at one local station here. The only problem is it's $ 7.00 a gallon !

Where do you get it? Back 50+ years ago when ga was really gas and not something concocted by a corn farmer with a degree in chemistry 101 or 102 octane was available and I ran all my bikes on it as well as my sports cars.


Stephen
2019 M3W, AR Stage 2

Re: 99 Octane Fuel (RON) - worth it? [Re: rockabilly john] #675103
27/11/20 11:25 PM
27/11/20 11:25 PM
Joined: Oct 2012
Posts: 2,490
Furry Boots City
RedThree Offline
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Joined: Oct 2012
Posts: 2,490
Furry Boots City
Originally Posted by rockabilly john
Just a thought, has anyone tried Avgas LL 100 octane???

Won't do the cats any good and will poison the Lambda sensors too.

Re: 99 Octane Fuel (RON) - worth it? [Re: RedThree] #675104
27/11/20 11:51 PM
27/11/20 11:51 PM
Joined: Feb 2019
Posts: 2,896
Port Orchard, WA.
LightSpeed Offline
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LightSpeed  Offline
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Joined: Feb 2019
Posts: 2,896
Port Orchard, WA.
Originally Posted by RedThree
Originally Posted by rockabilly john
Just a thought, has anyone tried Avgas LL 100 octane???

Won't do the cats any good and will poison the Lambda sensors too.


Probably true. I was using it before computers existed.


Stephen
2019 M3W, AR Stage 2

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