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E_T_V E_T_V is offline

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  1. E_T_V
    19-11-2008 20:00 - permalink
    Grr I wrote a big long post as an answer but the forum ate it!.

    In short yes you can improve things, however porting a derv is different to porting a diesel in some respects.

    Triple angle valve seats or even radiused valve seats will help improve flow.
    Remove any casting marks and open out ports on the intake side to match the gaskets. Leave any steps on the exhaust side as they are there on purpose. Also leave any swirl creating bits in the intake valve pockets as swirl is important to give an efficient engine. I've put up some pics of what I did to my old prima somewhere. If you can't find them let me know and I'll dig them out.
  2. ziobobby
    19-11-2008 19:30 - permalink
    Hi Dan,got some more Q's for
    So,here they come:
    -since i'm quite sure the head gasket has gone i'm thinking about buying another head and modifying it...i've been told that maybe you've already done this kind of thing before so....what can i do?
    Gasflow it?Port matching?
    I was also thinking about changing the profile on the valves (suggested from Donny),but i wouldn't know where to get this done or the costs.

    I also have a spare intake manifold and i was thinking about getting it laser cut in two pieces to have better access to the internals so i can gasflow and port it as good as i can then reweld it worth it or not?

    So let's put it this way:While fitting the new head gasket,what can i do to improve the head/manifold?

  3. E_T_V
    19-11-2008 19:11 - permalink
    To be honest if you are only replacing the diff then I'd not worry too much about shimming the gearbox as the diff bearings rarely alter the amount of play there. It is usually the input shaft that changes the most when you rebuild a gearbox. I've got the rebuild manual somewhere around here if you need the figures to shim it up.

    There are two (well ok 3 if you include the quaife ones) types of LSD. Aside from the bearing journals shearing off of the type A diffs they are usually pretty reliable. It'll be obvious when you look at a type A diff when it is out of the gearbox if the bearing journal is sheared off.

    If you get stuck then let me know as I've rebuilt a few boxes.



    (sorry message was too long originally!)
  4. E_T_V
    19-11-2008 19:10 - permalink
    LUK clutches are good, I fit them to most of my cars as they are cheaper than OE but usually excellent quality. They aren't OE though, however they may be the same clutch in a different box but I can't tell you for sure whether this is the case or not.

    LUK may offer sport clutches but I'm not sure you'd have to check the part number to be sure if this is the case.

    There are two thicknesses of input shaft used on the T16. The U spec ones have the thicker shaft, and the intercooled diesels all got the U spec gearbox. Some T16's did and some didn't, but it usually isn't an issue. If you are just swapping the diff then the input bearings won't need changing anyway unless they are noisy.

    The bearings are:
    input shaft :3/MJ28 & 3/LJ28
    main shaft :RJ2024 & 3/LRJA25 + 43/LJ25
    diff :6208 x two
  5. DrEvo
    19-11-2008 18:42 - permalink
    Hi Dan,

    A couple of quick questions for you about my gearbox and clutch rebuild.

    First, I received the clutch this week and it is LUK. Is this the standard OE clutch?

    Second, do you know the bearing codes for the uprated diesel box? The guy, Gazza, I'm having him to build the box thinks my box has a thicker input shaft than the T16.

    Three, is it worth taking the box to get built? I was just planning on swapping the dif, but you said that the bearings need to be shimmed. I have not a clue about how to do this.

    The other issue is that I dont know how to tell if the LSD that I actually bought is any good. How can you tell?

    Thanks for you help.


  About Me

  • About E_T_V
    Where did you hear of this site?
    What make of car do you drive?
    Maestros, 200, 600, ZTT
    Any modifications to your car?
    Too many to list here.
    Your Country
    United Kingdom
    Under a car near scunthorpe
    Cider and women
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