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Thread: Bobbybrown's New Nova - It's Arrived!!

  1. #601
    Euro-Nova Founder bobbybrown's Avatar
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    I’ll post the results of the test on Monday.
    Also can’t rule out the ignition switch, so if the jumper wire is successful I’ll then try bypassing the ignition switch and see which is at fault.

  2. #602
    Senior Member Phill's Avatar
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    Quote Originally Posted by bobbybrown View Post


    Iíve also removed the heat exchangers this engine came with but Iím left with the pipes shown in the photo, one each side.
    What should I be doing with these?


    Thanks all!
    This could be what's causing the bad missfire - As Alistair said these feed hot exhaust gas up to the carb inlet to stop freezing. If they're not blanked off you will have an air leak on the inlet side which causes a missfire. Regarding the starter issue make sure you have a good earth from the gearbox to the floorpan as the gearbox mounts act as an insulator and if the earth strap from gearbox to floor pan is missing or making a bad connection this could be causing the high resistance.

    A cheap source of heavy duty wiring from the battery to the starter solenoid is to use the cable used on electric welders
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  3. #603
    Euro-Nova Founder bobbybrown's Avatar
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    Thanks Phill.
    What would I be looking for to blank them off? Do they have a specific name?

    I knew when firing it up yesterday it was by no means totally ready to go, such as these pipes, but itís at least confirmed the engine will run and the engine wiring is more or less on the right track.

  4. #604
    Senior Member Phill's Avatar
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    "The most beautiful kit car in the world - Motor"

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  5. #605
    Senior Member Phill's Avatar
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    Actually I might be wrong in my assumption that the heat risers feed hot gas into the inlet manifold itself. I think it may simply pass the gas near the inlet pipe (heating it up to stop freexing) but not actually putting hot exhaust gas into the inlet manifold. This being the case then they would not cause an air leak if left open after all? Perhaps someone else could confirm if this is or is not the case?

    A full explanation about heat risers here:- http://www.vw-resource.com/heat_risers.html
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  6. #606
    ***Euro-Nova Supporter*** BlueNova's Avatar
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    I recently fitted new heat risers to my inlet manifold and they don’t actually feed hot exhaust gases into the manifold. They simply transfer heat to the manifold.

  7. #607
    Senior Member Phill's Avatar
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    Quote Originally Posted by BlueNova View Post
    I recently fitted new heat risers to my inlet manifold and they donít actually feed hot exhaust gases into the manifold. They simply transfer heat to the manifold.
    Thanks for clarifying that Alistair. I thought you'd know the answer
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  8. #608
    Euro-Nova Founder bobbybrown's Avatar
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    Ah great, so they can be left alone then

  9. #609
    Euro-Nova Founder bobbybrown's Avatar
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    So, next query...
    this is a photo of the new engine, Iíve circled something in green. Is this a fuel overflow/return?
    I can see the one outlet on the fuel pump thatís free which is the connection from the tank, the other fuel pump connection is going to the top of the carb, so what about this extra one....the twin carb set up was so different so Iím finding myself in uncertain circumstances with some of this.


  10. #610
    ***Euro-Nova Supporter*** Peter's Avatar
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    That's whwere the throttle positioner fits on early engins but I'm not so sure that is what that is, you can remove it.
    Get a grommet in the distributer as well.

    What letter is before the 'D' on the engine number?

    page 37 item 19 Autobooks mnaual.

    VW carb.jpg
    Last edited by Peter; 10-10-2020 at 04:51 PM.
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