Results 1 to 11 of 11
  1. #1
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default Cam Shaft Pulleys

    The current pulleys that are fitted are solid but I have some others from another head which have holes in them...they are Lancia/Fiat parts too.

    Any advantage in swapping them?

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

    Default

    Seriously doubt it. If you are going to go to the trouble of swapping cam pulleys, you may as well buy and fit some vernier ones.
    1994 Alfa Romeo 155 Q4: Dozeing in the garage.
    2009 Audi A4 tdi: Everyday drive.
    1994 Alfa Romeo 155 , 1995cc Std Standard Black

  3. #3
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Quote Originally Posted by Steve Webb View Post
    Seriously doubt it. If you are going to go to the trouble of swapping cam pulleys, you may as well buy and fit some vernier ones.
    I didnt think so either. I am always curious as to why they give little things design changes. Always think they must of had good reason

    Vernier pulleys, very nice but not for now.

  4. #4
    Join Date
    Jun 2006
    Location
    Buenos Aires, ARGENTINA
    Posts
    464
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    I have the ones with holes fitted in my camshafts but I just think its an inertia issue. Although I don't think that this will make any noticeable performance change.

  5. #5
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Thanks. Best I do not touch them then

  6. #6
    Join Date
    Jun 2006
    Location
    The Netherlands
    Posts
    819
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by AlfaJack View Post
    Vernier pulleys, very nice but not for now.
    They are also on my to do or whis list

    Greetings,
    Marc
    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

  7. #7
    Join Date
    Dec 2006
    Location
    halfway to the 'ring
    Posts
    232
    Mentioned
    0 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    lafa, and maybe lancia has well, have the habit of doing things properly at first (like crossdrilling pulleys), and then give up on those things to save a few ?? on manufacturing.... this has been like that since WW2 at least...

  8. #8
    Join Date
    Feb 2007
    Posts
    622
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Quote Originally Posted by AlfaJack View Post
    The current pulleys that are fitted are solid but I have some others from another head which have holes in them...they are Lancia/Fiat parts too.

    Any advantage in swapping them?
    If they are lighter (which they must be) and you have them on the shelf then yes fit them, it's only a very mild mod, but if you have them already then it is worth doing. Just make sure they are not from an N/A engine or check the timing marks on them incase they are any different (I don't know whether they will be or not). Also check the tooth profile as there was a very early type used on the 'grale which was weak, recalled and discontinued.

    Solid ones are early type, with holes in are later type so things did improve....

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

    Default

    Thank you. I will post a photo of them and do a comparison. But given that I will not know if these are the early weak type I may give it a miss.

  10. #10
    Join Date
    Feb 2007
    Posts
    622
    Mentioned
    1 Post(s)
    Tagged
    0 Thread(s)
    Rides
    0

    Default

    Sorry - I meant that the belt that used this type of tooth form was weak, not the pulleys themselves. If your (trapezoidal type) belt fits these pulleys (and the difference is huge) and they have the same locating marks (both timing and dowel hole) then you will be ok. The weak belt type which is a square tooth was recalled and binned from only the early 16v 'grales which was probably around what, G or H plate?

    As we are talking about different tooth types, if you look closely at your belt it has a very small groove or channel on each tooth, this is so the air can escape from each one as it hits it's opposite number on the pulley, if it didn't it would have a tendency to float slightly at high RPM.

  11. #11
    Join Date
    Jun 2006
    Location
    London
    Posts
    2,677
    Mentioned
    9 Post(s)
    Tagged
    0 Thread(s)
    Rides
    1

    Default

    Interesting stuff. I would never had considered that a belt could float like that. More design work than you would think.

    Cheers!

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
  •