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Thread: Twin plug 2.5 on Ebay - JUICY

  1. #1

    Twin plug 2.5 on Ebay - JUICY

    Kenik
    - 1969 911S
    - 1965/66 911
    - S Reg #760
    - RGruppe #389

  2. #2
    Senior Member Rico's Avatar
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    Mar 2005
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    Fort Lauderdale, FL
    Posts
    492
    The description says its not a destroked 2.7.
    What car came originally with a 2.5 twin plug?
    Steve

  3. #3
    I think 'not a destroked 2.7' means it has the super rare 89mm mahles on a 70.4mm crank like the ST and not a 90x66 short stroke.


    Wheres the ignition? In the one blurred pic that shows the distributor it looks like a standard dizzy, right? Most of the stuff that is making up that motor is not real easy to find.
    #711 - expires 12/05
    1972 911T - Sepia 3.2 - For Sale

  4. #4
    I think the 89 mm pistons were used with a 66 mm stroke to get 2.466L. The other version the factory used was a 86.7 x 70.4 which produced 2.492L. This engine must be using the 66mm crank.

    Gib Bosworth

  5. #5
    So, we're talking a long stroke 2.5 here? The torquey 2.5?
    Paul D. Early S Registry #8 - Cyclops Minister of West Coast Affairs
    "Now, to put a water-cooled engine in the rear and to have the radiator in the front, that's not very intelligent." -Ferry Porsche (PANO, Oct. 1973)

  6. #6
    Quote Originally Posted by Shuie
    Wheres the ignition? In the one blurred pic that shows the distributor it looks like a standard dizzy, right? Most of the stuff that is making up that motor is not real easy to find.
    The missing 12 plug dizzy would easily add another $3-4k to the final price of the engine.
    Anyone approximate what the compression ratio and HP output would be on this engine?

  7. #7
    I live in Tucson and if any one is real interasted in this engine I will look at it, Although I am not real fond of the person selling it, his shop had done alot of work on my car for the previous owner and I am spending alot of time and money now to make it right.

  8. #8
    Senior Member
    Join Date
    Oct 2002
    Posts
    442
    Sounds like there us a story here that could benefit some of us.....after this sale is completed - maybe you can fill us in on the details of the work being redone.

  9. #9
    Is the motors at Chuck's shop? Don't know much about Redline's reputation.
    Phil

  10. #10
    Quote Originally Posted by gruen911
    Anyone approximate what the compression ratio and HP output would be on this engine?
    The factory 2.5 short stroke engine was made in 1972 (after the long stroke 2.5) and was used in the ST race cars. The 2.5 with MFI made 275 HP. Assuming no additional head work has been done, the compression ratio should be 10.3:1. The factory port size on these was somthing like 41I and 41E. This would be a killer race engine, but a little too high strung for the street IMHO. Even if you were to switch in a milder cam, the ports are too big to flow well at low RPMs. Of course this is all assuming it actually is built to the factor 2.5 short stroke spec.

    Brooke
    Brooke
    1969 911 ST w/ 2.8SS
    1973 911 RS tribute with 3.3 turbo
    1970 914-6 w/ 2.2S (sold)
    1972 BMW M2 (sold)
    R Gruppe #338
    S Reg # 855

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