Eberspacher BN4 installation

Discussion in 'Mech Tech' started by Molteni Mike, Jan 4, 2014.

  1. Paul I think I have the wiring diagrams as I have one too which I am hoping to fit at some stage, I will try and find them and get them over to you.
     
    Paul Weeding likes this.
  2. if anyone finds a switch for the BA6 let me know it's the only bit I'm missing :(
     

  3. Look to me like your missing the exhaust pipe, inlet pipe, thermostat control cable and re-circleating air vent and cover that fix's the snorkel in place. Other than that it look pretty complete. The only way you will get the re-cycleating part to work is if you mount it where its designed and if you do this, there will be no space for another battery as the exhaust and inlet pipe vent though that panel.
     
  4. Let me know what it looks like cause I have a few here and one may well be a BA6 switch
     
  5. bluething likes this.
  6. bluething likes this.
  7. Ouch... :eek:

    Is it the clockwork and thermostatic switch? As I can imagine it being that sort of money!!
     
    Alex VW Heritage and bluething like this.
  8. if you do Icepug would you consider selling??? Cheers Alex, I'll see what icepug comes back with
     
    Alex VW Heritage likes this.
  9. that's the one Paul. it's the only bit missing from my system
     
  10. yeah, i don't need it!!! I will have to check the part number on it later on for you.
     
  11. Just done a "Bench test" of my Eberspacher BN4 petrol heater prior to installation.

    Ran it for quite a long while to fully test the system in a safe environment. There's no control wire for the thermostat, but it's stuck in a position which safely cuts out. It can be adjusted at a later date for fine tuning.
    I first calibrated the fuel metering pump to give the recommended 13-15ml per 200 "clicks".
    No fuel leaks and the hot air has no smell of fuel or fumes. The exhaust is also nice and clean.

    Fuel economy by stopwatch and calibrated measure was about 0.55lt per hour - ie around 70p per hour.

     
    Paul Weeding likes this.
  12. PSG

    PSG

    nice and hot though arent they. awesome.
     
  13. Buy a bigger pipe.... ;)

    You might get away with a reducer to drop it to 24mm :thinking: but it really depends if your exhaust for it was 42mm straight through, or whether it went into a silencer first, and was then reduced to a smaller size!!
     
  14. theBusmonkey

    theBusmonkey Sponsor

    Try this. I think it's the ID your after but best to phone them & confirm.....Paul has a point, sometimes there would have been a silencer box.

    http://sales.butlertechnik.com/exha...-or-webasto-exhaust-pipe-40mm-36061381-371394
     
  15. Good point! At first, I'd have been nervous of reducing a 42mm exhaust flange to 22mm (back pressure). But thinking about it, the engine uses fuel at a far greater rate and the exhaust tailpipe is no larger. The bench test showed the exhaust to be very quiet, so I won't bother with a silencer, just need to find a reducer now ;)
     
    Last edited: Jan 19, 2014
  16. theBusmonkey

    theBusmonkey Sponsor

    Try Espar at Harleyford Marina, they hold obsolete parts etc.
     
  17. Zed

    Zed Gradually getting grumpier

    Mine has 22mm exhaust but I wouldn't describe it as quiet! Maybe once you reduce it your's will get noisier?
    Plenty of room for the battery if the wheel well's gone + on an early early there's just one panel above the wheel tub and you're into the rear. Since the picture I fiited an oil filter under the battery tray and span the battery round 90 degs to make more room for the pipework.
    [​IMG]
     

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