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Tesco Momentum99

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  • Paradigm
    Paradigm Posts: 3,656 Forumite
    Part of the Furniture 1,000 Posts Name Dropper Combo Breaker
    benham3160 wrote: »
    I could explain it, but this post would run into pages and probably wouldn't be understood by quite a few users, as you need to have a pretty good knowledge of cars to comprehend why a harder to burn fuel increases performance, but most cars will not take advantage of this.

    Oh go on, explain it to us thickys ;) Why it would run into pages I don't know.. a couple of paragraphs would suffice surely?
    Always try to be at least half the person your dog thinks you are!
  • Paradigm wrote: »
    Oh go on, explain it to us thickys ;) Why it would run into pages I don't know.. a couple of paragraphs would suffice surely?

    It's explained on wikipedia here. Good luck ;)
  • Paradigm
    Paradigm Posts: 3,656 Forumite
    Part of the Furniture 1,000 Posts Name Dropper Combo Breaker
    It's explained on wikipedia here. Good luck ;)

    Read it before & it's neatly summed up in two paragraphs which is why I posted "Why it would run into pages I don't know.. a couple of paragraphs would suffice surely?"
    Always try to be at least half the person your dog thinks you are!
  • droodle
    droodle Posts: 22 Forumite
    From what i have learned at college studying mechanical engineering, the higher the RON number the less chance of detonation of the air/fuel mixture, which can cause server damage to pistons and crankshafts, etc etc. Cars require a controlled burn. Also its not just a case of RON, its also about the additives added to the petrol, such as detergents, etc for cleaning carbon deposits and the like. Theres a reason Ferrari use shell vpower and not Tesco's equivalent, same as why ford recommend BP
  • Paradigm wrote: »
    Read it before & it's neatly summed up in two paragraphs which is why I posted "Why it would run into pages I don't know.. a couple of paragraphs would suffice surely?"
    But it doesn't actually explain the ins and outs of ignition timing.

    Which must be understood to completely comprehend what is explained there, sorry I didn't explain it. I'll write out a full answer overnight shall I?

    Regards,
    Andy
  • anewman
    anewman Posts: 9,200 Forumite
    Part of the Furniture 1,000 Posts Combo Breaker
    edited 20 August 2010 at 12:30AM
    I'm sure even my old 1994 Skoda Favorit Glxie with Bosch Monomotronic fuel injection had a knock sensor on the gearbox bell housing, with electronically controlled ignition. I believe the earlier models had a vacuum controlled advance/retard mechanism on the timing and the timing could no doubt could have been adjusted by rotating the distributor in the retaining shaft.

    Some reading here anyway http://en.wikipedia.org/wiki/Ignition_timing
    and
    http://en.wikipedia.org/wiki/Octane_rating
    droodle wrote: »
    ford recommend BP
    I am sure Ford recommend BP because there's money in it for them. There'd be hell to pay if Ford refused warranty repairs due to using Morrison's fuel etc.

    Also on the Thorney motorsport testing of Tesco's fuel, as someone on Pistonheads points out, Thorney gets cash from Tesco in sponsorship, so they're hardly going to release a report to say the stuff is junk.
  • anewman wrote: »
    I'm sure even my old 1994 Skoda Favorit Glxie with Bosch Monomotronic fuel injection had a knock sensor on the gearbox bell housing, with electronically controlled ignition. I believe the earlier models had a vacuum controlled advance/retard mechanism on the timing and the timing could no doubt could have been adjusted by rotating the distributor in the retaining shaft.

    Some reading here anyway http://en.wikipedia.org/wiki/Ignition_timing


    I am sure Ford recommend BP because there's money in it for them. There'd be hell to pay if Ford refused warranty repairs due to using Morrison's fuel etc.
    No idea why you'd have a knock sensor on the bell housing, what an odd place to put it? Maybe because of the low grades of fuel that engine would have had to run on in some markets?

    Knock sensors are still relatively modern, or novel though. Still lots of "new" cars floating about that don't have them, just a set ignition curve.

    Regards,
    Andy
  • tomstickland
    tomstickland Posts: 19,538 Forumite
    10,000 Posts Combo Breaker
    edited 20 August 2010 at 12:20AM
    benham3160 wrote: »
    Fuel octane is not a measurement of "power" of the fuel, it's infact how difficult the fuel is to burn. The higher the number, the more difficult the fuel is to ignite. So 95 RON fuel (standard unleaded) burns more easily than 99RON fuel.
    The Octane number measures the auto ignition properties of the fuel. ie: the ability of the fuel to ignite due to pressure and temperature rather than from the spark.

    Because this was such a difficult job to measure then fuel is compared with a set of reference fuels.
    Actually, read this, it explains it all:
    http://en.wikipedia.org/wiki/Octane_rating

    Edit: already linked by another poster.

    Regarding ignition timing, high octane fuels usually allow an engine to have the optimum spark timing. As engines start to knock (pink) then the timing has to be !!!!!!, and this causes a power drop.

    Almost everything now has knock sensors, so higher Octane could help. However, there is some evidence that unleaded fuels lose their Octane rating over time.
    Happy chappy
  • Almost everything now has knock sensors, so higher Octane could help. However, there is some evidence that unleaded fuels lose their Octane rating over time.
    I'll second this, one of the cars I look after is laid up for several months of the year, (MX-5, timed for 98RON) and it always pinks like !!!!!!y on it's first run of the summer.

    Regards,
    Andy
  • Inactive
    Inactive Posts: 14,509 Forumite
    I would not trust any bumph put out by Tesco, and I certainly wouldn't buy their fuel, whatever silly name they choose to give it.
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