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Thread: Mazda design petrol engines without spark plugs which increase fuel efficiency by 30%

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    Mazda design petrol engines without spark plugs which increase fuel efficiency by 30%

    Mazda claims to have designed a vehicle that will largely eliminate the need for spark plugs in petrol engines, increasing fuel efficiency by as much as 30%. The development also increases the existential threat facing diesel engines because its fuel economy could match dieselís performance without high emissions of nitrogen oxides or sooty particulates

    Mazda said it would sell cars from 2019 with a newly developed petrol compression ignition engine, a technology that automotive manufacturers, including deep-pocketed rivals such as Daimler AG and General Motors, have been chasing for decades. The engine ignites petrol through compression, removing the need for spark plugs and increasing fuel efficiency.

    But Mazda said its Skyactiv-X engine would have spark plugs that would be used in certain situations such as at low temperatures.

    Mazda boosts petrol engine efficiency in fresh blow to diesel | Business | The Guardian

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    well they were the only ones to perfect the rotary were the first to get Atkinson cycle to work on an otto cycle and now the first to make compression ignition work.
    the good news is but they can use it to revive the rotary

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    What did that bloke say ''tell him he's dreamin''. Pat

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    Quote Originally Posted by lyonsy View Post
    well they were the only ones to perfect the rotary were the first to get Atkinson cycle to work on an otto cycle and now the first to make compression ignition work.
    the good news is but they can use it to revive the rotary
    What rotary did they perfect and what engine had Atkinson cycle?. Pat

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    from the 13b on they have had the rotary sorted and reliable so long as you let them warm up and didn't do short commutes everywhere
    kjzem 2.3L v6 that was fitted to the eunos 600 mazda 929's of the early to late 90's where the first manufacture to use variable valve timing to create a atikison cycle effect in a otto cycle engine.

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    Mazda simply held the inlet valves open passed bottom dead center to reduce pumping losses,that does not make it an Atkinson cycle engine.Rotaries are a design dead end,the reason no other manufacture bothered with them. Pat

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    Quote Originally Posted by PAT303 View Post
    Mazda simply held the inlet valves open passed bottom dead center to reduce pumping losses,that does not make it an Atkinson cycle engine.Rotaries are a design dead end,the reason no other manufacture bothered with them. Pat
    Pat,
    Dead end or not, the comment was that Mazda perfected them ( as far as possible to perfect any engineering concept) . Warming them up was indeed the trick, certainly tested my patience back in the 70's..
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    I was taught that compression ignition is by definition "dieseling"......some cars did this after a hot long run after the ignition was turned off...I think it was reasonably common in the "new" high compression Vanguards.

    Wouldn't that make this "new" engine a diesel?

    Mazda did the Miller cycle engine.....I had not heard of the Atkinson, has it been used successfully in a production vehicle?

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    I don't know what is so special about using petrol for a diesel function - turn the ignition off on my old Subaru and I could keep it running quite happily with a bit of throttle .

    It was NSU, not Mazda that brought the rotary to production - Mazda just refined the concept and took out some but not all of the flaws.

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    Quote Originally Posted by PAT303 View Post
    Mazda simply held the inlet valves open passed bottom dead center to reduce pumping losses,that does not make it an Atkinson cycle engine.Rotaries are a design dead end,the reason no other manufacture bothered with them. Pat
    yes which is creating an Atkinson type cycle on an otto cycle engine that yes does reduce pumping losses which improves engine efficiency and if you want a fuel miser na engine that's what you do, just ask Toyota with their 1.5L Prius engine, if you do it with boost it then becomes a miller cycle on an otto cycle engine

    the nsu was flawed and rushed out to beat Mazda to the market with the engine essentially still in prototype stage while Mazda's 10a was more production ready but until the masses got hold of them that was when more flaws became know and then due to only mazda continuing to go with the rotary took until the 13b to get enough mechanics to know how to work on them (no google back then)

    Atkinson cycle is similar to miller cycle but with out boost

    as for design dead end most major car manufactures had production ready engine's ready to go and then the 73 oil crisis hit and due to their fuel usage they all pulled the pin apart from Mazda, so to achieve what they have with it for only one company doing all the r&d on it they have done remarkable well, it also gave Mazda something to set it apart from all other Japanese manufacture's.

    with direct fuel injection Mazda should have an engine that is now more economical and able to meet new emission laws as well it should also mean they can run much higher compression ratio's for greater performance.
    will it ever make low down torque like a big piston engine maybe if you made it have a larger elliptical crank (btw this is what Mercedes and gm had done) to allow more torgue or you build it as a very efficient high rpm air pump which is what they have been doing so far with their halo cars in the rx7 and rx8

    as for whats special about it its the first time something as volatile as petrol has been able to controllable combusted with compression ignition

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