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Thread: 2.4 TV to 2.7 RS - "Leo Kinnunen tribute"

  1. #1
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    2.4 TV to 2.7 RS - "Leo Kinnunen tribute"

    Hi,

    I am a big fan of Leo Kinnunen and already almost a year ago decided to build a replica of his `73 RS .

    Car already has:

    - Factory 911 RS rear arches
    - Plastic gas tank
    - Sport recaros
    - Originally Blutorange colour
    - Matching 2.4 Vergaser engine (German sold car)

    Collected parts:

    - Original 73RS rear bumpers
    - Ducktail and Whale tail both
    - 911 2.7 RS Mahle NOS pistons and cylinders
    - Correct large diameter steering wheel
    - 911 E MFI system complete
    - 911 RS Fuchs
    - Stainless steel full exhaust
    - 911 RS glass fiber front bumper but this does not have high enough quality.
    - All NOS lights
    - Full oil cooler kit
    - 250km/h meter


    I have few questions for the forums specialists here:

    - 73T vs. `73RS Chassis differences other than rear arches and tunnel reinforcements in the back?

    - 2.4TV to 2.7RS Engine modifications. To my knowledge the block needs to be modified to fit the enlarged cylinders. I happen to have spare set of center lube Solex cams, would those be near the required specs?

    - MFI... Pump needs to be modified to RS quantities, is there anywhere info on the part numbers that are needed for the modification? Do the intakes need any modifications?


    https://photos.app.goo.gl/hFsd3L3XzTV6U5p48
    Last edited by Mikkoh; 01-05-2023 at 11:01 PM.
    911 1965 MY66
    911E 1972 Coupe
    911TV 1973.5 Coupe

  2. #2
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    MFI : You need an RS space cam for the pump , right now Bosch is not making any , so hard to find . If you can find one , buy it ! The stacks and throttle bodies need to be machined to RS or '72 , '73S specs , easy with the right tooling , find the right person .

  3. #3
    Hi,

    the German company Eisenbrandt Renn & Motorsport remanufactures new ones.
    Very specialized company. People (owner speaks English very well!)

    https://www.eisenbrandt.eu/2017/raum...hp?language=en

    I ordered a 2.2S space cam and a friend a 2.8 RSR cam.

    They are not cheap, however that is relative for parts NLA.....

    Good luck,
    Bart

  4. #4
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    Thank you! This is a great tip, can you share the price?
    911 1965 MY66
    911E 1972 Coupe
    911TV 1973.5 Coupe

  5. #5
    Cool project, unfortunatly your car don't have the real RS arches, not correct steering wheel (yours is standard 911) and not correct MFi stacks/pump model (Mag stacks vs plastic).
    You can try Classic auto clock in Poland for gauges conversion
    #rennfrog

  6. #6
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    Trailing arm reinforcements are another difference. Depends on how accurate of clone you want to make, and in what sequence of the ~1500 cars. The Konradsheim book is very helpful in detailing the differences and the cost a relatively small amount compared to the cost of your restoration. It is also a great book to read regardless.

    The car you linked to is quite a special one-off RS, so even that would have substantial modifications relative to a "normal" lightweight, e.g. the S/T flares rather than RS and the 3.0 spoiler. Further compounding matters, that car has been restored, so you're copying something that is not exactly the same as original. Either way, I'd suggest contemplating whether you want a "tribute" or "clone" which in theory is the difference between something which reasonably approximates the experience of driving the car you are after and something which is an exact replica and indistinguishable in driving. There are some great threads on here which illustrate the rabbit hole of getting the minutia right, e.g. the quantity of undercarriage protection in the wheel wells. Looking at the photos, it looks like a larger '74-'75 flag mirror - was that original, a period improvement, or done by a subsequent owner? Interesting questions, or a waste of time? It is for certain a beautiful car and will be rewarding to emulate!

    FWIW, the correct S TBs and stacks along with a 019 pump are for sale on one of the forums, I forget which. In the US, Eurometrix can convert your E stacks to RS specs. It isn't cheap!
    MBR #3926
    '71 911 T Targa "Rick White"
    '71 911 E "Karen"
    '10 E61 "Vomit Comet"

  7. #7
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    I notice you have a 2.2 E pump , cannot be converted to an RS pump , a 2.4 pump is needed for the conversion .

  8. #8
    Hi Mikkoh (and others if interested...),

    I payed for 2.2S space cam +/- €650,- what is with the current exchange rate more or less the same in $$$

    Cheers,
    Bart

  9. #9
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    Quote Originally Posted by Richy View Post
    I notice you have a 2.2 E pump , cannot be converted to an RS pump , a 2.4 pump is needed for the conversion .
    Can someone confirm this? I have also 911E where I can use the MFI set but probably will not be able to find spare 2.4 pump that easily.
    911 1965 MY66
    911E 1972 Coupe
    911TV 1973.5 Coupe

  10. #10
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    2.4 T pumps are relatively easy to find . And why don't you believe me , an RS 3 dimensional cam does not fit in a 2.2 MFI pump .

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