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Thread: Engine Sizes for SWB 911's in Competition

  1. #1
    Senior Member
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    Engine Sizes for SWB 911's in Competition

    A friend of mine asked me this question.. and I wasn't sure. It's not something you generally find in the literature.

    We know Porsche ran quad cam engines in 911R's and R&d or promotional sportomatic transmissions, but is there evidence of swb's running larger engines either in period (65-68) or after this?

    If they did, when and where?

  2. #2
    The factory or we cretins? 'Cause I've seen some silly stuff crammed into a SWB car. 2.0 would be the limit for vintage racing.

    Tom
    Early S Registry #235
    rgruppe #111

  3. #3
    Senior Member
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    In period, by either the factory or privateers using readily available Porsche parts.

  4. #4
    Usually the organizers and fellow competitors took a dim view of running larger than 2.0 liter engines in the 2.0 liter class. However, and this may come as shock to you, but racers have been known to cheat However they usually don't advertise what they did!
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  5. #5
    Say it ain't so...

    Tom
    Early S Registry #235
    rgruppe #111

  6. #6
    Assuming rules and engines were stretched, how big could engines get considering 66mm cranks were the only option? Offset grinding big ends will only get a small increase. I can't imagine many privateers having the capacity to produce their own longer stroke crank. How big can you bore a sixties era cylinder and still retain original external appearance?

    It's clearly easier to mix and match later stuff now to get a capacity increase but 2.2, 2.4, 2.7, 3.0 etc parts weren't available in the 60s. Surely we can get some old school secrets out now without risking law suits or protests to race results.

    It seems the factory focused on higher revs and stayed within the 2.0l capacity. High profile races were likely subject to more protests and strip downs and I doubt Porsche would have wanted to be caught cheating.
    Jeff Eelkema
    69E (project)
    S Reg #1431
    Aust TYP 901 #132

  7. #7
    I owned a 2.3 '67 engine. Was it a cheater motor? Maybe...could be...probably was.

    Tom
    Early S Registry #235
    rgruppe #111

  8. #8
    If you were running in a 2.0 liter class then I'd say no question, yep, you were 'cheatin' Of course some only considered it cheatin if you got caught!!
    Early S Registry member #90
    R Gruppe member #138
    Fort Worth Tx.

  9. #9
    I won't disparage the good name of the man who originally owned it. He cannot defend himself. I don't think the 2.31 was an unusual modification.
    Early S Registry #235
    rgruppe #111

  10. #10
    Senior Member t6dpilot's Avatar
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    If yer not cheatin', yer not tryin'.

    I wonder when that 2.3L was built Tom?
    Scott H.
    1969 Coupe LtWt
    1973.5 911T

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