cooling question.

Discussion in 'Mech Tech' started by cabbieman, Aug 21, 2011.

  1. Honky

    Honky Administrator

    I think with buggies the owners just take the risk.

    When we first got our van 18 years ago we didn't know it was supposed to have the foam to seperate the hot and cool areas. We drove it like that for years.
     
  2. vw sent these things all over the world and spent alot of time hot and cold testing them , and a properly maintained engine will be fine if you want to leave it running in traffic or turn in off/on . If turning it off made the head temp rise dangerously then we would all have vw`s with the engine constantly running . they are a very robust engine and will take alot of stick , the porsche engine is no different to the type 4 engine as the fan is same location !!! if you timing is correct and all the tinware/seals are in place and the thermostat works you will be fine
     
  3. stop worrying about it - just drive it and dont turn the engine off during stop/start jams - it does'nt help at all. Just dont keep thrashing it in stop/start traffic!
     
  4. Moons

    Moons Guest

     
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  6. Wow what alot of different opinions!

    The simple fact is the VW engine SUCKS air in and then blows it over the heads, and then out undernieth past the exhaust. Whether the bus is moving of not makes very little difference. If you stand behind a VW when it's being reved you will feel the hot air being blown out under the engine. The Intake vents are mounted high up to ensure that the hot air being blown out under the bus is not sucked back in. (this is only really an issue in stationary traffic) therefore is you open the engine hatch, or have a poor fitting seal around the hatch there is a risk of the hot air being sucked back in and reducing the cooling effect.

    The simple solution is to keep the cooling stock. correctly tuned with ALL tin wear and seals in place and a functioning thermostat ( lets face it VW put it on for a reason after spending millions in research)

    The top half of the engine (what you see in the engine bay) is the cool side with intake manifolds, ht leads and electrics where as the underside is the hot side with exhausts. Just make sure that no air can get from the hot side to the cool side.
     
  7. rickyrooo1

    rickyrooo1 Hanging round like a bad smell

    i like debates like this - i do have a semi serious side belive it or not! being a novice on vw engines i'm finding this facinating,cheers so far for keeping my interest.
     
  8. Sorry I get a bit opinionated on this subject, ever since I stripped down my engine

    I was really impressed and surprised with how all the tin wear works. How it fits together. Before I always thought (like a lot of people) that air cooled VW's were a bit crude, but now I can safely say that i think the're great!

    Very well designed and put together and they work (most of the time!)
     
  9. Poptop2

    Poptop2 Administrator

    i did get pye eyed in Italy once and left my van running all night , i was more amazed by the fact it was still there in the morning than thinking about the damage done -- so maybe it makes no odds , i've always turned my engines off in long traffic jams even in my lorrys ,, save's fuel too ;)
     
  10. rickyrooo1

    rickyrooo1 Hanging round like a bad smell

    i wish i knew enough to look over mine a bit more, i know i have bits of tim missing/blanked off due to the exchangers being removed but i have no idea what effect this is having or indeed what the missing bits used to do.
     
  11. You could always post some pictures up here and let people advise accordingly :)
     
  12. Poptop2

    Poptop2 Administrator

    Nedfaux i think it was posted me the most fantastic detailed diagram of the whoe system on the old site , sorry nf if it was'nt you but someone did !!
    Just did a google cached thing and can't find it Rick ???
     
  13. Poptop2

    Poptop2 Administrator

     
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  15. rickyrooo1

    rickyrooo1 Hanging round like a bad smell

     
  16. If remember correctly you were missing some of the tin wear under the engine around the exhaust manifold. Although not as critical as the top ones, it does mean that you are not getting full cooling to the underside of the head, and in theiory the heat from the exhaust could build up.

    You really should get it replaced, if only for peice of mind
     
  17. rickyrooo1

    rickyrooo1 Hanging round like a bad smell

    yeah it is underneath, deffo some rectangle bits blanked by the bottom of the fan area and some bits at the rear, i also don't have a fan to the windscreen as all the heating is removed so all the pipe holes in the tin have been filled over.
     
  18. I have seen people take the tinware off when building buggies IMHO this is definitely the wrong thing to do. In a buggy you need that tinware even more.
     
  19. The air being directed for heating in the cab goes through the heat exhangers and will not have any effect on the air cooling the engine. That air is pushed forwards buy the motion of the bus moving forwards and relies on the positive presure in the engine bay. This is why the heater fan only runs when you're stationary
     
  20. rickyrooo1

    rickyrooo1 Hanging round like a bad smell

    maybe i'll get chance to look at a type 4 tin set up complete one day to see what i have missing, unless one of you lot know of a pic on the net showing it complete?
     

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