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Discussion in '"Stock" Alpine' started by skywords, Apr 19, 2007.

  1. skywords

    skywords Donation Time

    Can anyone explain what Holbay is? I see parts for sale that are Holbay such as a rocker cover with Holbay instead of Sunbeam on it. Was this an aftermarket company or Racing parts? Is this stuff better of worse?

  2. Wombat

    Wombat Donation Time

    Holbay was a British builder of racing engines. They built for Rootes a twin weber version of the 1725. This engine was used in the 1968 London to Sydney Marathon winning Hillman Hunter and fastback Sunbeam Rapier H120. I am not sure which the engine was originally developed for. It was also used in the Hunter GLS (UK only).

    The engine had a different head with inlet ports that were smaller(!!) than stock and a different combustion chamber shape that looks as though it would breathe better. The engine also had different flat top pistons, heavier valve springs, higher compression, longer duration cam, the webers, headers and no doubt other items as well.

    Better?? maybe, but I am sure that similar performance could be obtained by other mods. Ther was some debate on the old board about the relative merits of the Holbay head compared to stock.
  3. alpine_64

    alpine_64 Donation Time

    the holbay motor also ran:

    finned alloy sump
    oil filter base with temp sender
    different dizzy
    different cam though there seems to be 2 versions, the production on and the development one (e128?)

    the holbay engine is also a slant mounted motor, so it wont bolt dirrectly to an alpine. you need to swap timing covers and also modify or get a new inlet manifold.

    The smaller runners were to help with low end torque apparently.
  4. skywords

    skywords Donation Time

    Thanks guys
    E-bay UK under sunbeam alpine is a holbay rocker cover polished very nice and one of those oil filter adapters if anyone is interested, ships worldwide. No bids yet.


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