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Heat risers??

Discussion in 'Engine & Transmission' started by Jason Smith, Feb 23, 2019.

  1. Jason Smith

    Jason Smith Member

    Messages:
    142
    Location:
    Wynnum West, Brisbane
    hi again, I have 2 of these under the van. The heater blower has been removed, heater ducts in engine bay blocked off.
    Do I need to block these off under the bus?
     

    Attached Files:

  2. tintop

    tintop Well-Known Member

    Messages:
    986
    Location:
    Canberra
    the engine fan will still blow air through these (and if you include the missing bits - into the van). the heater blower was just there to assist

    there's quite a few kombis driving around without the heater connected...but if you want the missing bits, let me know and i'll have a look in the shed for something sellable
     
  3. Jason Smith

    Jason Smith Member

    Messages:
    142
    Location:
    Wynnum West, Brisbane
    Nah mate it’s alright. Should I blank them off or are they alright to leave as they are?
     
  4. cbus

    cbus Well-Known Member

    Messages:
    13,519
    Location:
    sunshine coast
  5. Jason Smith

    Jason Smith Member

    Messages:
    142
    Location:
    Wynnum West, Brisbane
    Not sure if the lower ducts have been blocked off mate. Will find out.
    Cheers
     
  6. cbus

    cbus Well-Known Member

    Messages:
    13,519
    Location:
    sunshine coast
    A discussion point...
    Air is blown thru heater boxes from lower fan housing to cool heater boxes . this is vented via the "mushroom heads" normally on front of heater box, when heater not operating.
    This is to cool boxes and reduce heat to heads.
    ( this is part of why I suggest blocking riser hole )

    *It would be better to maintain this cooling air.
    *QN, is there enough air pressure from front to restrict this flow from fan. I don't think its significant given pressure from fan.

    * if cooling air not maintained then heat shields between heater boxes / head rocker covers a good option.
    Ceramic coating full heater boxes and exhaust manifolds even better.

    *I don't expect that blocking lower vents to heater boxes increases flow to heads given design of shroud and fan.
    Thoughts ?
     
  7. Jason Smith

    Jason Smith Member

    Messages:
    142
    Location:
    Wynnum West, Brisbane
    To be honest matebthis is above my head sorry
     
  8. cbus

    cbus Well-Known Member

    Messages:
    13,519
    Location:
    sunshine coast
    Don't stress.
    A general invite for comments by others :D

    Just blank off the riser holes in heater box and tinware in meantime.
     
  9. tintop

    tintop Well-Known Member

    Messages:
    986
    Location:
    Canberra
    yeah, my initial thoughts were that leaving it as is you would catch air from the front which would be competing with the air from the cooling fan...I've only seen disconnected heaters which still have the risers and heater flaps up top...that's the way I'd go.

    I wouldn't block the fan end either - that bit of extra air running over the exhaust is probably useful. You don't have it if you have J pipes but they are out in the open.

    In any case I'd make sure the pipes into the van are blocked off to stop fumes (and rodents) coming through the vents
     
    TeeBee likes this.
  10. Jason Smith

    Jason Smith Member

    Messages:
    142
    Location:
    Wynnum West, Brisbane
    Hey tintop
    Now I am actually thinking about connecting heater back up and have put a post up with what I need or think I need haha. Can you see if you have any of the items on the list that is sellable?
     
  11. tintop

    tintop Well-Known Member

    Messages:
    986
    Location:
    Canberra
    just replied to your other post...PM me if you are interested in any of it
     

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