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-   -   premium fuels (http://forums.sv650.org/showthread.php?t=110875)

Wideboy 23-05-08 06:01 PM
premium fuels
 
do you think they work or is it just a placebo effect?

me personally yes, yesterday in France i topped up with 98 high octane petrol and i accelerated up to 90MPH up a steep hill with out tucking in which for 33bhp and me on the bike is not to shabby, had loads more guts than usual

when back in blighty going up the M27, still had guts

what do you think?

northwind 23-05-08 06:03 PM
Re: premium fuels
 
I think the Shell and BP premiums are better for carb icing, but make no difference for power- higher octane just can't, unless you have an engine that makes use of it (ie increases ignition advance or forced induction boost, or you build it with higher compression).

But that's not all that can change of course, there can be other stuff in premium fuels which might help.

neio79 23-05-08 06:13 PM
Re: premium fuels
 
for us mear mortals it makes no differance whatsoever, other than to our wallets.

muffles 23-05-08 06:28 PM
Re: premium fuels
 
I thought most bikes don't have knock sensors and the ability to retard the ignition hence higher octane fuel makes no difference...?

I know it makes a difference in cars, which often can take advantage (though how much difference is dependent on the individual car of course).

Blue_SV650S 23-05-08 07:26 PM
Re: premium fuels
 
Quote:
Originally Posted by northwind (Post 1519058)
I think the Shell and BP premiums are better for carb icing, but make no difference for power- higher octane just can't, unless you have an engine that makes use of it (ie increases ignition advance or forced induction boost, or you build it with higher compression).

But that's not all that can change of course, there can be other stuff in premium fuels which might help.
Indeed.

I mean why the feck put 98 octane in a restricted bike anyway? :scratch:

Wideboy 23-05-08 08:40 PM
Re: premium fuels
 
Quote:
Originally Posted by Blue_SV650S (Post 1519149)
Indeed.

I mean why the feck put 98 octane in a restricted bike anyway? :scratch:
was sharing a pump with a R6

northwind 23-05-08 10:53 PM
Re: premium fuels
 
Quote:
Originally Posted by muffles (Post 1519091)
I thought most bikes don't have knock sensors and the ability to retard the ignition hence higher octane fuel makes no difference...?
.
I think most of the beemers do now. You could build your bike to only run on premium if you wanted, deck the heads or run stupidly high advance, but as standard the SV will run on rubbing alcohol :D

yorkie_chris 23-05-08 10:58 PM
Re: premium fuels
 
Quote:
Originally Posted by muffles (Post 1519091)
I thought most bikes don't have knock sensors and the ability to retard the ignition hence higher octane fuel makes no difference...?

I know it makes a difference in cars, which often can take advantage (though how much difference is dependent on the individual car of course).
Nope very few are that advanced. The curvy no chance, it only has throttle position and crank position sensors.


There's a slight difference in density between fuel grades which can give a very slight advantage in mixture dependant on altitude, humidity, temperature, weather and the rest...

kwak zzr 23-05-08 11:17 PM
Re: premium fuels
 
chuck the cheap stuff in if u can call it cheap!

Orpheus 24-05-08 02:18 PM
Re: premium fuels
 
On my Rs125 i thought it made a very slightly noticeable increase in performance, but i cant say for certain that it wasn't just in my mind.


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