Star Brite

[boborgera]

For those of you that think BRP is in cahoots with the Oil Co's and that is why they say a minimum of 91 Octane is recommended, I think you are all wet and do a disservice to our community.:gaah: The Rotax 998cc engine is a well built engine that puts out more horsepower than, say, a 1200cc Harley engine. One of the reasons for this is that the 12.2:1 compression ratio, of the Rotax engine, gets more air and fuel, hence more power, into the cylinder. The problem with these high compression ratios is that the air/fuel mixture can detonate just from the heat of compression. One way around this problem is to use a fuel type that has an anti-knock compound added to the fuel. This is why BRP(Rotax) recommends a minimum of 91 Octane. Now, if you use a fuel with 87 or 89 Octane your engine might very well "Ping" or "Knock". If your ECM detects pinging, it begins to RETARD THE TIMING until the ping goes away. This is why it may appear that your scoot runs fine with lower octane fuels. With the retarded timing, though, you may not get a complete burn and the result is LOWER POWER for each cycle that utilizes retarded timing.
Using a fuel additive would get around this problem but then the cost-effectiveness might suffer.
So, the 91 Octane recommendation is NOT a plot by BRP to take away your freedoms:lecturef_smilie: but rather is a recommendation to permit you to get the most out of your machine.:clap:

:agree:But some don't want to spend 20/25 cents extra for 91 ,So they try to convince themselves and others that 87 is better;
It's like that movie quote, You don't want to know the Truth.:dontknow:

 

[murphybrown]

I'm joining the TEST groupie!!!

Got some of that there Star Tron stuff (like the color!!!)...went to WMart and got me one of those thingies to give kids liquid meds (has measurements rite on it..plus easy to put small amt of liguid in AND poor into kid or gas tank whichever is handy!!)...paper for recording all fills/mileage...calculator for calculating :dontknow: .. I'm ready .. committed to trying for my trip to Corbin/Spyders in the Redwoods...will let you know the results. opcorn:

 

[Firefly]

For those of you that think BRP is in cahoots with the Oil Co's and that is why they say a minimum of 91 Octane is recommended, I think you are all wet and do a disservice to our community.:gaah: The Rotax 998cc engine is a well built engine that puts out more horsepower than, say, a 1200cc Harley engine. One of the reasons for this is that the 12.2:1 compression ratio, of the Rotax engine, gets more air and fuel, hence more power, into the cylinder. The problem with these high compression ratios is that the air/fuel mixture can detonate just from the heat of compression. One way around this problem is to use a fuel type that has an anti-knock compound added to the fuel. This is why BRP(Rotax) recommends a minimum of 91 Octane. Now, if you use a fuel with 87 or 89 Octane your engine might very well "Ping" or "Knock". If your ECM detects pinging, it begins to RETARD THE TIMING until the ping goes away. This is why it may appear that your scoot runs fine with lower octane fuels. With the retarded timing, though, you may not get a complete burn and the result is LOWER POWER for each cycle that utilizes retarded timing.
Using a fuel additive would get around this problem but then the cost-effectiveness might suffer.
So, the 91 Octane recommendation is NOT a plot by BRP to take away your freedoms:lecturef_smilie: but rather is a recommendation to permit you to get the most out of your machine.:clap:

Basically agree-- other than I'm not sure about the stated compression ratio. Perhaps you're talking about the 998 engine used in the RT ?

The GS (and I assume the RS) 998 engines do not require anything more than 87 octane-- and while they also stated a pretty high compression ratio-- this was found out to be incorrect when tested.
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Pertaining to the use of these magic elixirs--- don't you all think if there was some magic thing that could be added to gas that gave better MPG that one of the big gas companies would have jumped on this and just added it to all their gas in the first place? That would be one heck of a sales pitch if Shell could prove better MPG using their gas.

Fact of the matter is there are no proven lab results showing any MPG improvement from using these magic elixirs.

I'd be willing to do my own test just to see what happens-- and riding really doesn't work well since there are so many variables.

Here's what I'm thinking:

Do the testing in a lawnmower-- no under load (so just sitting there in the driveway running.

Run 1/2 gallon of gas thru the engine to get everything warmed up- run the engine dry.

Fill exactly 1/2 gallon regular gas - run it till it runs out and time how long it runs.

Re-fill with 1/2 gallon regular gas and magic elixir - run it till it runs out and time how long it runs.

If the magic elixir does any good then the engine should run longer.....


What do you all think??
Run 1/2 gallon

 

[boborgera]

What do you all think??
Run 1/2 gallon

Go for it;:thumbup:
Also i think you should Run a 1/2 of 91 on a third test. It would be interesting to see the results. I only have a push mower so i can't do a half gal., And I'm not good at fractions.

 

[vampyregirl]

Pertaining to the use of these magic elixirs--- don't you all think if there was some magic thing that could be added to gas that gave better MPG that one of the big gas companies would have jumped on this and just added it to all their gas in the first place? That would be one heck of a sales pitch if Shell could prove better MPG using their gas.

Why would they want to promote something like this though? Using it would increase your mileage, therefore you are NOT stopping at the gas station as often. They would actually LOSE money in the long run. Since they are greedy, greedy, greedy..... Just my opinion..... :dontknow:

 

[coz]

science test

i think that would be a very good scientific test. however maybe a pint would be better, so the test would not take so long, as everyone around here will lose interest, highjack the thread, crack wise, go to sleep, re-arrange their sock drawer, go to the early-bird special, ect. ect. ect. that being said, i for 1 am interested:2thumbs:

 

[Firefly]

Why would they want to promote something like this though? Using it would increase your mileage, therefore you are NOT stopping at the gas station as often. They would actually LOSE money in the long run. Since they are greedy, greedy, greedy..... Just my opinion..... :dontknow:

People would flock to a gas brand if they knew they got better MPG--- perhaps even pay more for it... they would make up the potential 'loss' by not filling up as often in volume and/or higher pricing.

My point is if there was such a magic elixir-- it would have been adopted by some (if not all) of the big oil companies.....

 

[NancysToy]

People would flock to a gas brand if they knew they got better MPG--- perhaps even pay more for it... they would make up the potential 'loss' by not filling up as often in volume and/or higher pricing.

My point is if there was such a magic elixir-- it would have been adopted by some (if not all) of the big oil companies.....

:agree: Add this one to the holy grail, the perpetual motion machine, and cold fusion. Whoever perfects it will be financially set for life...and famous in the bargain.

 

[retread]

There's also the point that if gas sales go down, gas prices go up to keep profits up.:gaah:

john

 

[Trickie Dick]

People would flock to a gas brand if they knew they got better MPG--- perhaps even pay more for it... they would make up the potential 'loss' by not filling up as often in volume and/or higher pricing.

My point is if there was such a magic elixir-- it would have been adopted by some (if not all) of the big oil companies.....

They already make it. It's call gasoline WITHOUT ETHANOL. The problem is finding it; at least in the corn-fed state.:gaah: