Gas recommended for MCS
#276
Was wondering if anyone knows what the reason could be that my mini is hesitating to get up to speed like a put put, its a standard 05 mini s please help
#277
Doing this for some reason,tends to foul up your spark plugs pretty quickly and that gave me some major acceleration problems. Try changing your plugs and see if that helps
#278
#279
Well I didn't read this entire post because it's a mile long. But in a nutshell, Mini's have a high compression engine which is why they need a higher octane. Any engine that has a compression ratio above approximately 9 to 1, will need a higher octane fuel. Higher compression engines need a slower burning fuel which is provided by the higher octane rating!
#282
#283
RON vs AKI
Explanation taken from Wiki...
"Research Octane Number (RON) 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.
Anti-Knock Index (AKI)
In most countries, including Australia and all of those in Europe, the "headline" octane rating shown on the pump is the RON, but in Canada, the United States and some other countries, like Brazil, the headline number is the average of the RON and the MON, called the Anti-Knock Index (AKI, and often written on pumps as (R+M)/2). It may also sometimes be called the Road Octane Number (RdON) or Pump Octane Number (PON).
Difference between RON and AKI
Because of the 8 to 10 point difference noted above, the octane rating shown in the United States is 4 to 5 points lower than the rating shown elsewhere in the world for the same fuel. See the table in the following section for a comparison
RON MON AKI
"regular" gasoline in Australia, New Zealand, Canada and the US 91–92 82–83 87
"EuroSuper" or "EuroPremium" or "Regular unleaded" in Europe 95 85–86 90–91
"SuperPlus" in Germany, Great Britain, Slovenia and Spain, "SP98" in France 98 89–90 93–94
#285
Jeezus how many times are the cheap/uninformed going to bring up this topic? IT'S IN YOUR MANUAL PEOPLE! The engineers aren't lying to you! Put less than 91 in the engine will pull timing to prevent your engine from detonating itself - as has been posted ad-nasium. Search - it's a wonderful thing, so are FAQs. So are Manuals. I think this has been posted over 10 times this month alone.
#287
The manual says premium, the gas cap says premium, and your MA should have told you premium. If you don't run premium you are giving ammo to the service department to deny warranty service for certain maladies that may result. You really should stick with premium. ESPECIALLY for a S model.
#288
As posted on other threads, regular gas as opposed to premium isn't a lower grade fuel. It just has lower anti-knock properties as the octane rating suggests. There is more potential power in lower octane but higher compression/more timing advanced engines can't use it to its full potential due to knocking/predetonation. So the perfect fuel is the lowest octane rating that allows your engine to run as timing advanced as it needs for best performance without predetonation.
#289
#290
Really, , , wouldn't they need to prove that lower octane was used ALL THE TIME and not just one tank? What if just THAT ONE TANK was higher octane and lower had been used the rest of the time? They are going to test every mini that comes in for work? Seriously? It defies logic.
#291
Really, , , wouldn't they need to prove that lower octane was used ALL THE TIME and not just one tank? What if just THAT ONE TANK was higher octane and lower had been used the rest of the time? They are going to test every mini that comes in for work? Seriously? It defies logic.
You come in for detonation faults.. They very well might run an octane test - they are troubleshooting the car and need to find out why there is detonation. If they test it and the octane is low - you just got yourself a service bill.
Blow a hole in the piston? Dang straight they would test the gas if they didn't find any mechanical problems for it happening. The computer would already have a string of knock detections saved. You think you'll throw some premium in there after blowing a piston to cheat the gas test? unlikely.
Stuttering/stalling/hard to start problem? They look at the injectors - Are they clean? Fuel pressure good? If yes, test the gas and charge the customer if it's bad..
Dealerships can easily and cheaply get gas tested. Of course they will if that is a possible cause of whatever problem you've had and there are no other obvious reasons or the obvious reasons have already been disproven.
#292
there are no other obvious reasons or the obvious reasons have already been disproven
Last edited by Heaven; 05-01-2011 at 03:49 AM.
#293
go ahead and run whatever you want. Please post when you have to pay a repair bill so i can laugh at you.
#295
Higher oct is the temp that fuel burns a high compression engine causes more heat in the compression stroke the gas burns before the plug fires causing a knock and yes the computer changes timing to help out but some performance is lost Cleaners are added to fuel to keep your injectors clean not for a knock problem The higher the engine compression the higher the oct
rating that in needed
rating that in needed