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changing fuel type

 
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Old 05 Aug 2005, 01:36 am
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Location: Boston, MA, USA.
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Default changing fuel type

someone suggested that once and awhile i should put 89 octane into my cruiser. (the idle is sometimes a little rough even with double platnium plugs and new wires - yes they are gapped correctly)

i have a 2004 touring n/a with 9500 miles.

is that a good idea or am i heading for disaster?? [:I]
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Old 05 Aug 2005, 03:01 am
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Quote:
quote:Originally posted by legion

someone suggested that once and awhile i should put 89 octane into my cruiser. (the idle is sometimes a little rough even with double platnium plugs and new wires - yes they are gapped correctly)

i have a 2004 touring n/a with 9500 miles.

is that a good idea or am i heading for disaster?? [:I]
ive been runnign mid grade with much success, better mileage, etc. BUT ive been throwing my O2 sensor. no biggie since i have a comp. reader
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Old 05 Aug 2005, 03:48 am
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what do you mean throwing your o2 sensor?
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Old 05 Aug 2005, 04:23 am
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oh, sorry. For some reason using higher octane fuels will make the O2 sensor cause your engine light to come on. Its more annoying than damageing.
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Old 05 Aug 2005, 12:01 pm
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If you have a turbo, or supercharger, or are experiencing Detonation ("Knock") you need higher octane gas. Octane rating is merely a measure of resistance to detonation and is needed for high-compression engines. No matter what the oil company advertisements say, there is no other benefit to 'premium'.

If the engine don't need it, you are wasting your money.

http://www.cartalk.com/content/colum...August/03.html

http://www.ftc.gov/bcp/conline/pubs/autos/octane.htm


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Old 05 Aug 2005, 07:06 pm
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[|)] What he said. Unless you have a HP motor with a knock sensor, higher octane is not needed, and in fact racers have found more power with lower (proper) octane for a specfic engine. Seems that when the octane is increased past what is needed, the engine can't ignite the fuel properly, losing power. Same reason nitro motors need a lot more timing. If the timing is the same as gas, the fuel takes too long to ignite, causing highest combustion pressure to be reached long after the best point. It also causes more deposits, due to incomplete burn.
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