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Car Forum / MINI / September 2003Erratic performance, pt 2
Some of you might remember my previous post about erratic performance. I thought the problem was solved, but interestingly, it reappeared today: I have been running 95 octane unleaded successfully for a while, and it was on switching back to 98 octane the problems re-started: the engine performance seems to go in a 1 second cycle of performing and dropping in performance when going 50-70 mph -? only to be alleviated by pulling the choke out, after which the engine runs perfectly The problem is obvious: My car has a problem with 98 octane petrol. However, I was under the impression that the main difference between 95 and 98 was that 98 was supposed to deliver higher performance? What gives? Should I do anything, or just keep filling 95 octane and forget about it? sincerely, Haje > However, I was under the impression that the main difference > between 95 and 98 was that 98 was supposed to deliver higher > performance? Not even that. Both fuels will have similar energy content. The different is in their combustion characteristics, with the higher octane fuel burning more slowly. Using a fuel of a higher octane rating than is required in an engine will not give more power and should not make any difference. All you need is a high enough octane for the engine. Too low and you have to retard the ignition, reducing power. what model is your car? if its injected and runs the computer it will usualy take a tank ful or two for it to "reset" its self. I run my MPI and carb vehicles on 98 and get much better economy. The MPI dosnt perform any better but does run smotther, whilst the carb cars all seem to have better response and performance. Tim > Some of you might remember my previous post about erratic performance. I > thought the problem was solved, but interestingly, it reappeared today: [quoted text clipped - 14 lines] > > Haje > what model is your car? if its injected and runs the computer it will usualy Injector? I'd be so lucky. It is a 1988 Mini City Automatic. 'HJ i would say definatley to run it on 98 octane, Lis, thats my better 1/2, has a MG Metro powered Mini which is basicaly the same engine as in your 88 car...give or take a few things, and has proven itself to be much better on the 98. Cleaner running, better economy and whislt not more powerful as in BHP/ Acceleration etc has better staying power on the hills...which we have a lot of in NZ! A lot of club memebers have also bought second hand imports from Japan of Mayfairs and Cooper Models, a lot of them Auto, and they are also finding that the 98 is much better. Takes a tank or two to become apparent however so dont put it in and expect instant improvement. Tim > > what model is your car? if its injected and runs the computer it will > usualy > > Injector? I'd be so lucky. It is a 1988 Mini City Automatic. > 'HJ hey tim is it hard to get latish auto motors over there in the land of the long white cloud ??? if so what do they cost ??? also are you coming over for bathurst ??? makka > i would say definatley to run it on 98 octane, Lis, thats my better 1/2, has > a MG Metro powered Mini which is basicaly the same engine as in your 88 [quoted text clipped - 13 lines] > > Injector? I'd be so lucky. It is a 1988 Mini City Automatic. > > 'HJ hiya would the carb be getting too hot and making the fuel vaporise in the carb before it gets to the engine ? Have you fitted an LCB type exhaust manifold without any heat sheilding fragged > Some of you might remember my previous post about erratic performance. I > thought the problem was solved, but interestingly, it reappeared today: [quoted text clipped - 14 lines] > > Haje > would the carb be getting too hot and making the fuel vaporise in the carb > before it gets to the engine ? > Have you fitted an LCB type exhaust manifold without any heat sheilding I have the factory-installed air filter and carb. Haven't done anything in particular to the engine. HJ  Signaturevisit the Mini Link Repository! http://www.minirepository.com You're lucky mate. The highest you can get in Canada without filling up at the airport is 94! > Some of you might remember my previous post about erratic > performance. I thought the problem was solved, but interestingly, it [quoted text clipped - 16 lines] > > Haje > You're lucky mate. The highest you can get in Canada without filling up at > the airport is 94! Ermm... Find that difficult to believe... "standard" unleaded is 95, if I am not terribly mistaken. HJ Signaturevisit the Mini Link Repository! http://www.minirepository.com Not here mate, the "Regular" is 87 RON, then you get 90, then 92 is the highest most have. Mohawk has 94 cus of all the ethanol they put in it. I can take a picture of a petrol pump if you want! :D Yes, standard unleded in the UK is 95. Probly why so many people gawp at me when I tell them it's equivalent of $1.80 Canadian a liter... >> You're lucky mate. The highest you can get in Canada without >> filling up at the airport is 94! [quoted text clipped - 3 lines] > > HJ > Not here mate, the "Regular" is 87 RON, then you get 90, then 92 is the > highest most have. Mohawk has 94 cus of all the ethanol they put in it. I > can take a picture of a petrol pump if you want! :D > > Yes, standard unleded in the UK is 95. Probly why so many people gawp at me > when I tell them it's equivalent of $1.80 Canadian a liter... Hmm.. I am vaguely surprised by that. I know that Canada has a similar climate to Norway, where I used to live. I lived briefly up north as well, and most of my friends swore to running their scooters on the highest possible octane, as they said it ran hotter and helped get the engine up to temperature. Dunno about the veracity of this, but after having lived up in the snow and cold, I took their word for it. Ah well. Another difference learned about ;) HJ |
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