98+ octane fuel

twincam

twincam

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Any one found any benifit from using high octane petrol on the new 2010 boxer twincam engine,ie smoother running,power,economy etc???:nenau
 
I've not found it running smoother but I consistently get more MPG with 98. 2-3mpg is normal. I can't really understand why but I'm not the only one who has noticed this. Any boffins out there care to take a stab at it?
 
veetwokay said:
I've not found it running smoother but I consistently get more MPG with 98. 2-3mpg is normal. I can't really understand why but I'm not the only one who has noticed this. Any boffins out there care to take a stab at it?
Click to expand...

Shell promise more mpg as part of the sales pitch for their posh petrol. The explanation is here:
http://www.shell.co.uk/home/content/gbr/products_services/on_the_road/fuels/v_power_pkg/tech_spec/
They claim reduced friction & higher octane gets you more power per bang. Whether the extra miles per tank is cost effective is another matter.
 
Shell vpower is 99 RON,my 09 GSA loves it,only ever top up with other pump pish when desperate and it feels flat as a fart in comparison :augie
2nd gear wheelies is the best test i've got,off the throttle with v power,with a tug and a bump without :thumb
 
I think you need to read it again... :D

"RON" is anti detonation characteristics, again....Nothing to do with calorific value...

It's a comparison "number" . Count your fingers backwards on one hand, 10-9-8-7-6 & then add 5 from the other. Do you have 11 fingers ? ;)

The most common type of octane rating worldwide is the Research Octane Number (RON). RON is determined by running the fuel in a test engine with a variable compression ratio under controlled conditions, and comparing the results with those for mixtures of iso-octane and n-heptane.
Click to expand...

This refers only to "pump gas" mind you.. not aviation or red gas...


Sorry, being a devils advocate here. The poster asked about added power. With the anti knock sensors adjusting timing to suit the fuel used, you should see a higher output with fuel less prone to knock or pre ignition.
 
alimey4u2 said:
I think you need to read it again... :D

"RON" is anti detonation characteristics, again....Nothing to do with calorific value...

It's a comparison "number" . Count your fingers backwards on one hand, 10-9-8-7-6 & then add 5 from the other. Do you have 11 fingers ? ;)



This refers only to "pump gas" mind you.. not aviation or red gas...
Click to expand...

I've gone back to the article to copy the section that you seem to be oblivious to,
"A fuel with a higher octane rating can be run at a higher compression ratio without causing detonation. Compression is directly related to power (see engine tuning), so engines that require higher octane usually deliver more motive power. Engine power is a function of the fuel, as well as the engine design, and is related to octane rating of the fuel."
Click to expand...

Pay particular attention to the last sentence.

Of course, only engines that have fancy ECUs, that can adjust the timing to allow greater compression of the air/fuel mixture before the bang cycle, will get the benefit of the higher octane fuel.
 
alimey4u2 said:
Please see my additional edit at the bottom.... :beerjug:

Looks like I beat you to it.... ;)
Click to expand...

I wasn't the one who was wrong in the first place, dearie. Post editing is just another phrase for ****ed up.

Have a :hug
 
On my 1300GT I used to get about 20-25 extra miles on a tankful of 98 compared to 95. This works out to about 4 mpg extra. The bike already had so much power that a mere mortal like myself could not notice any great difference. Dont know if it was financially worth it but fewer stops is usually a good thing.
 
I use 99 octane but tbh don't notice a significant difference personally I think its all Bullshit!
 
There is of course the other option for tractors of this era TVO :P ... I'm sure mine couldn't run any worse with it....
 
I've personally found that using the super unleaded from BP / Shell in car and bike I always get more mpg. Costs more but goes further, so I use it for that reason and not the supposed power gains.
 
Nippy Normans supply Touratech, Wunderlich, Desert Fox and many other makes of accessories.
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