Mk2 2l 8v red hot / flames

Discussion in 'Engines' started by 2golfs, Dec 5, 2004.

  1. 2golfs Forum Member

    Oct 23, 2003
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    OK, my friend got my new engine running today, but the exhaust manifold is glowing cherry red and there are occasional flames out of the exhaust (!).

    Is this just because the timing is off and because the engine is running lean?

    Spec: 1989 Mk2, p&p digi head, 2l bottom end, GS2H cam + vernier, 4-branch manifold + supersprint system. No mods to fuelling yet.

    I have considered fitting a power boost valve to richen up the mixture. Which is least bad - running rich or running lean? I will be getting a tune-up next week so want to know what to do in advance, i.e. do i need a PBV because PB fuelling must otherwise be altered via the chip??

    Advice / suggestions most welcome!!!! :)
    Edited by: 2golfs
  2. GVK

    GVK Paid Member Paid Member

    Oct 23, 2003
    Likes Received:
    Is it running ok? If it's strugling to rev and the ex mani is glowing, it'll be retarded timing.
  3. greg s Forum Member

    Oct 24, 2003
    Likes Received:
    United Kingdom
    It's safer to set an engine up slightly on the rich side. Rather than
    potential detonation problems you'll get potential bore washing problems
    and high fuel consumption. Neither's ideal though so you'd be best to get
    it tuned as soon as you can.

    I'm sure TSC will give you advice on how to get the Digifant to handle the
    fuelling but I'd have thought a good setup by most garages would sort it
  4. chrismc Forum Junkie

    Oct 22, 2003
    Likes Received:
    I use a remapped chip & a 3.5bar FPR to handle the fuelling....

    If the head is only a P&P with no change to valve sizes then the fuelling wont need drastically it wont be breathing a massive amount better.

    Id have it set up a tad rich to keep it all safe (2% CO at idle), & have the ignition timing set around stock (6-8 degrees BTDC @ 2000-2500rpm with blue temp sender disconnected)
    Edited by: chrismc

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