Results 1 to 18 of 18
  1. #1
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default Temp control under the bonnet.

    Is anyone using a thermal wrap on the Turbo or any other methods for trying to keep the temp down under the bonnet?
    I know a lot of the Integrale boys like to partition off the air filter area to ensure that the engine draws in cold air, but has anyone done anything similar for the Q4 and if so have you seen a difference?
    Same goes for the turbo wrap as well, although I'm not a big fan of thermal wraps as they can trap moisture and increase corrosion.

    Steve
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  2. #2
    Join Date
    May 2007
    Location
    Australia
    Posts
    963
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Steve, I think that the turbo blanket things that you can get are great - they keep the heat in the turbo - not the engine bay. But they are expensive...much better than any 'wrap'. Ceramic coating works great for the headers/extractors - but its really only practical with stainless steel exhausts - and its also expensive.. also much better than any wrap!

    I also have a heat shield between the headers and the fan...


    http://www.driftworks.com/forum/part...o-blanket.html

    jim.

  3. #3
    Join Date
    Jan 2007
    Location
    Derbyshire, UK
    Posts
    3,082
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    0

    Default

    I'm not a fan of wraps either, they break down fairly quickly and, as you say, cause corrosion

    Have you thought about ceramic coating for the manifold?

    Bonnet vents...

    Edit: No idea about the turbo wrap....surely dissipating heat from the turbo is a good idea???

    wrinx
    My Q4 in the Garage

    www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk

  4. #4
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    If I were to be getting a new manifold I'd get it coated for sure. I guess from a reliability point of view taking the heat away from the turbo would be best to stop the oil in the turbo from coking up. But from a power point of view keeping the gasses as hot as possible and therefore as expanded as possible is best until they leave the turbo, then cool them down so they take up less space in the exhaust.

    As for bonnet vents, not keen on letting rainwater in at the top of the engine, and I'm not convinced about how effective they are. The bonnet tends to be a high pressure area as the air is squashed as it tries to get over the car, so might not allow as much of the hot engine bay air out as you think it would.
    The often quoted example of this is the Nissan Sunny GTiR rally car, slightly different set of circumstances as the intercooler for the engine is mounted on top of the motor.
    They found that when running in night stages with a lightpod on the bonnet they got a performance boost as the pod created a low pressure spot over the bonnet vent increasing air flow over the intercooler. As a result they ran the car with the light pod even in the daylight.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  5. #5
    Join Date
    Oct 2011
    Location
    Poland
    Posts
    223
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by wrinx View Post
    I'm not a fan of wraps either, they break down fairly quickly and, as you say, cause corrosion

    Have you thought about ceramic coating for the manifold?


    wrinx
    I've got ceramic coated mainfold and guess what happend today
    damping mat under the bonnet directly above mainfold started to burn
    a lot of fire and smoke,
    fortunately had fire extinguisher and sorted this out very quickly, almost no damages under the bonnet exept the mat.

    so ceramic coated is for sure not enough... or damping mat was really in bad condition,
    what do you think about this?
    how to protect better engine bay and keep away heat
    wrap on mainfold? turbo wrap?
    anyone using above setups ?

    best regards
    "Never take life seriously. Nobody gets out alive anyway."

  6. #6
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Do you mean the sound deadening mat that is fastened to the underside of the bonnet?
    I've never heard of that catching fire before, but I've removed mine just in case. What manifold do you have?

    I'm not a fan of manifold wraps as they can hold moisture and cause accelerated corrosion.

    I've thought in the past that it would be a good idea to have a central vent in the bonnet, similar to the integrale to allow some of the hot air above the Turbo/manifold to exit the engine bay.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  7. #7
    mpampis_'s Avatar
    mpampis_ is offline Running smoothly
    OP of the best thread of the year 2012
    Best Modified car of the year 2012
    Join Date
    Jan 2010
    Location
    greece
    Posts
    487
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    You can remove two sponge (left-right) and the engine area will refresh with cold air

  8. #8
    Join Date
    Sep 2008
    Posts
    208
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Just make gold shields for the space between what gets hot and what doesn't want to be

  9. #9
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Quote Originally Posted by 1NRO View Post
    Just make gold shields for the space between what gets hot and what doesn't want to be

    Like a McLaren F1

  10. #10
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Also goes to show how important it is to have a fire extinguisher in the car. I always make sure I've got one to hand.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  11. #11
    Join Date
    Oct 2011
    Location
    Poland
    Posts
    223
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by Steve Webb View Post
    Do you mean the sound deadening mat that is fastened to the underside of the bonnet?
    I've never heard of that catching fire before, but I've removed mine just in case. What manifold do you have?
    took some pictures


    take it out away



    zoom



    cooked bonnet (or especially for my friend hood)



    ceramic coated stainless steel mainfold



    and cleaned bonnet(hood) - not too much damage at all - luck



    of course i have checked tooday in same conditions and the bonnet is now very very hot , so it must be protected somehow
    i've ordered aluminium matt to replace the old one, hope it will help for now.

    Quote Originally Posted by Steve Webb View Post
    Also goes to show how important it is to have a fire extinguisher in the car. I always make sure I've got one to hand.
    it's required by the law in Poland to have one in car, otherwise you will not pass the yearly MOT.

    regards
    "Never take life seriously. Nobody gets out alive anyway."

  12. #12
    Join Date
    Jan 2007
    Location
    Derbyshire, UK
    Posts
    3,082
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    0

    Default

    Lucky escape!

    I always carry an extinguisher in the Q4....can't think why

    wrinx
    My Q4 in the Garage

    www.alfaromeo155.co.uk ............................ □□□-V-□□□ .................................. www.ilmostro.co.uk

  13. #13
    Join Date
    Jun 2006
    Location
    Buenos Aires, ARGENTINA
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Sorry, but I don?t think that wraps will hold moisture, not if the car is periodically run (please, no jokes with Q4+peridically+runing)

  14. #14
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Very true Juan, but in the UK and other parts of Europe, the climate means that the engine bay gets damp even without the car moving, if the manifold is wrapped, the wrap will absorb the moisture and keep it damp even after the rest of the engine bay has dried out.

    Oh and Suzu, if you remove the two foam parts that are pointed out in the pic below, it should help airflow through the engine bay.

    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  15. #15
    Join Date
    Jun 2007
    Location
    Romania
    Posts
    665
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by wrinx View Post
    Lucky escape!

    I always carry an extinguisher in the Q4....can't think why

    wrinx
    It's understandable and it's safe, Wrinx.
    I have a strange feeling too when thinking at electric part. I don't like surprises.

    Also, when my Q4 remains in garage for few days or more I use to disconnect the battery. Is this allright with the electrics (ECU, etc..) ?? Thank you!

    Cheers,
    C.
    Alfa Romeo 155 Q4 WB '95
    Alfa Romeo per sempre !

  16. #16
    Join Date
    Jun 2006
    Location
    The Netherlands
    Posts
    819
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by Suzumushi View Post
    took some pictures


    take it out away



    zoom

    That looks very familiar.
    I hhave had the same problem with the isolation under the bonnet.
    Though it looked very nice in the dark when it happend
    Also very very hot.....
    In a world full of compromise...
    ...some don't.
    ___________________________
    Opel Astra Sports Tourer 110HP 2017
    Alfa 147 1.6 16V 120HP
    Alfa 155 Q4 2.0 16V turbo

  17. #17
    Join Date
    Oct 2011
    Location
    Poland
    Posts
    223
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by Steve Webb View Post
    Oh and Suzu, if you remove the two foam parts that are pointed out in the pic below, it should help airflow through the engine bay.
    Thanks Steve for an idea, done it already and some temporary solution to protect hood below.



    and in the near future i want to make some vents in the bonnet, but first i will get spare one for cutting and welding tests


    <edit>
    some interesting infrared photos









    regards
    Last edited by Suzumushi; 21-01-12 at 13:01.
    "Never take life seriously. Nobody gets out alive anyway."

  18. #18
    Join Date
    Apr 2006
    Location
    Bournemouth UK
    Posts
    4,782
    Mentioned
    2 Post(s)
    Tagged
    1 Thread(s)
    Rides
    1

    Default

    Were those thermal images taken after you had been out driving the car?

    Its interesting to see on the shots of the bonnet how hot the area just above the plenum is. Looks like it is nicely warming the air that has just been cooled by the intercooler.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •