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| 98 or 95 fuel https://ausmini.com/forums/viewtopic.php?f=2&t=98098 |
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| Author: | 69Cool [ Wed Dec 26, 2018 2:22 pm ] |
| Post subject: | 98 or 95 fuel |
Merry Christmas everyone. I have relocated & my local servo does not sell 98 fuel which is what I have always been advised to use in my 69 Cooper S. Is there any reason not to use 95? |
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| Author: | Harley [ Wed Dec 26, 2018 3:01 pm ] |
| Post subject: | Re: 98 or 95 fuel |
In the absence of 98, 95 should be fine unless you have a crazy high compression ratio. |
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| Author: | 69Cool [ Wed Dec 26, 2018 3:20 pm ] |
| Post subject: | Re: 98 or 95 fuel |
Thanks for the reply. It is only going to be a one off as I am low on fuel & it is 50 minutes drive to the closest 98 supplier. I will keep a supply here at home for the future now that I am aware. |
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| Author: | fuzzy-hair-man [ Wed Dec 26, 2018 6:07 pm ] |
| Post subject: | Re: 98 or 95 fuel |
I figure if it runs on 95 without pinging then there is no reason to run 98, except perhaps a margin of safety if you get some dodgy fuel? They may advise you to use 98 because it's the safest option, it's less likely to ping but unless your car is tuned for it, it won't make a performance or economy difference IMO. |
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| Author: | drmini in aust [ Wed Dec 26, 2018 9:04 pm ] |
| Post subject: | Re: 98 or 95 fuel |
If it's a real Cooper S with its 9.75:1 C/R I would only use 95 in an emergency. They NEED 98. Back in the day we used to add methyl benzene or benzol to 97 octane leaded Super fuel to stop them pinging....! Exception- IF you have put a big cam in it, it's then less likely to ping. |
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| Author: | fuzzy-hair-man [ Wed Dec 26, 2018 9:08 pm ] |
| Post subject: | Re: 98 or 95 fuel |
drmini in aust wrote: If it's a real Cooper S with its 9.75:1 C/R I would only use 95 in an emergency. They NEED 98. Back in the day we used to add methyl benzene or benzol to 97 octane leaded Super fuel to stop them pinging....! Exception- IF you have put a big cam in it, it's then less likely to ping. Fair enough. |
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| Author: | Matt I [ Wed Dec 26, 2018 11:23 pm ] |
| Post subject: | Re: 98 or 95 fuel |
My 1275 is somewhere in the region of 9.8-10:1 and has a decent cam... It tolerates 95 in an emergency if driven carefully, but really needs 98 unless there is no other option as the Doc says. |
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| Author: | TOZOOM [ Thu Dec 27, 2018 6:17 am ] |
| Post subject: | Re: 98 or 95 fuel |
Like the rest of the guys 95 should be ok put if you hear it pinging you need to back off and drive it to the conditions. Ive been in that situation my self and it was ok. Rob D. |
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| Author: | deluxe67 [ Thu Dec 27, 2018 1:58 pm ] |
| Post subject: | Re: 98 or 95 fuel |
My engine has 11:1 comp ratio (big cam tho as Doc pointed out) and used for 5 years with 98 RON fuel. On occasions I've had to top up with 95, no detonation cruising around. Even in Indonesia I had no problems (96 RON from memory). I carry some octane booster but never used it. As an aside, Toluene or Xylene are very cheap, easily available and both have RON's above 120 and are excellent octane boosters. Commonly sold as paint thinners, do not splash it on the paintwork! |
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| Author: | 9YaTaH [ Thu Dec 27, 2018 4:27 pm ] |
| Post subject: | Re: 98 or 95 fuel |
https://www.choice.com.au/transport/car ... in-repairs https://www.sciencedirect.com/topics/ne ... ce/toluene |
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| Author: | deluxe67 [ Fri Dec 28, 2018 2:09 am ] |
| Post subject: | Re: 98 or 95 fuel |
And your point is..? |
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| Author: | 9YaTaH [ Fri Dec 28, 2018 7:30 am ] |
| Post subject: | Re: 98 or 95 fuel |
deluxe67 wrote: And your point is..? https://www.choice.com.au/transport/car ... in-repairs https://www.sciencedirect.com/topics/ne ... ce/toluene |
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| Author: | Toy444 [ Sat Dec 29, 2018 6:10 am ] |
| Post subject: | Re: 98 or 95 fuel |
69Cool wrote: Thanks for the reply. It is only going to be a one off as I am low on fuel & it is 50 minutes drive to the closest 98 supplier. I will keep a supply here at home for the future now that I am aware. Hi 69Cool...I'd keep a check on the duration of how long your going to store the 98 Octane at home as the octane rating (especially 98...) will start to lose its RON over a short period of time if you don't use it in your car. |
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| Author: | brett [ Sun Dec 30, 2018 8:37 am ] |
| Post subject: | Re: 98 or 95 fuel |
98 octane fuel lasts approximately 3 weeks before the particles that create the "kick" start to diminish. I've running my S on 95 octane starts much easier if left for some time and has no issues |
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