Results 1 to 20 of 20
  1. #1
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Rebuilding rear of engine - couple of questions

    Afternoon chaps – after a bit of help/advice if possible

    Am in the middle of stripping and rebuilding the rear end of the engine in my raider (carb, inlet, exhaust manifold, turbo, pipework, air filter, intercooler, header tank etc) its been rebuilt previously but is a bit rough round the edges, Ill start a blog when I get 5 mins but currently all of my time is taken up cleaning engine parts!

    Anyway I have a few questions (though im sure this will grow!) based on comments/pictures Ive seen on here but need to clarify exactly what I do

    Firstly, there is a breather pipe coming off the side of the lobster back with a one way valve inserted which leads to a metal pipe that goes into the back of the turbo – is this pipe needed? I cant see it fitted to other people’s cars as I can see that people blank off that pipe on the lobster back. Also if I don’t need this pipe any advice on what I can use to block the hole on the turbo?

    Secondly, I notice from pictures that people buy silicon hoses without the overboost switch on the hose leading from the Turbo – Do I not need this switch? I need to order new hoses so shall I order without? If I don’t fit the switch what would you recommend doing to the wires for it – can I remove them or is it better to hide them away. Trying to tidy the bay up a bit – there are pipes and wires everywhere!

    Lastly, Im removing the pipework that comes off the side of the anti-perc fan – im also then removing the sensor/valve thing that the hose goes on to – this again has a wire leading to it. So my questions are, will this cause any running problems? What does it do? Can I again remove the wires?

    Thanks in advance for any help!

    Cayman

  2. #2
    Non-member Goobie's Avatar
    Join Date
    Mar 2002
    Location
    East Sussex
    Posts
    1,670
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    I'm guessing the pictures of other people's engine bays you've seen are running the cup mod set up.

    You don't need to have the one way valve set up really, unless you going for the 100% original look. As for the valve, you can just put a short bolt into the back of the turbo elbow, maybe put a bit of exhaust sealant on the thread before screwing it in just to be sure its sealed if you feel the need.

    Over boost switch, again not needed unless your going for the factory look. Just neatly tape off each end of the wire connectors so they can't short them selfs on anything and cable tie them out the way safely and same goes for the Perc fan wires if you decide to remove that to.

    The job of the Perc fan is to blow cool air over the carb and into the main boost hose to help the fuel sitting in it from evaporating in the heat and hot weather to solve the hot starting problems they suffer from in the summer months, but a few good pumps on the throttle when turning the engine over helps solve this.

  3. #3
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    thats great - really appreciated

    sorry - I didnt explain the perc fan bit very well - I meant what is the purpose of the valve thing mounted onto the bulkhead that the pipes lead to?

    Have you got any pics of the Cup Set up or any info about it?

  4. #4
    Non-member Goobie's Avatar
    Join Date
    Mar 2002
    Location
    East Sussex
    Posts
    1,670
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    I don't have a picture to hand but can dig one out later unless some one got one to hand and wants to post it up.

    Ok, I know the section you mean, it has a pipe coming off it going into the boost hose.

    It's locked shut till the engine off and the Perc fan kicks in, then opens to allow the cool air to be more directly blown into the boost pipe to flow into the carb inlet elbow for the same reason I've said above buddy.

    Little tip, thats usually the first place to check if you get a boost leak as that section can be a common problem.

  5. #5
    Non-member Wallace's Avatar
    Join Date
    Jan 2009
    Location
    herts
    Posts
    1,199
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    I can't see if the pictures are there or not cause using my phone, but hope this helps

    https://www.rtoc.org/boards/showthread.php?t=4756

  6. #6
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Ah cheers lads - that's a great help

    How do you usually block the unused carb outlets?

  7. #7
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Got another question - anyone have any pics of the turbo support brackets - my car hasn't got any and when the previous owner fitted a rainless manifold it cracked within days - I'm fitting the manifold but obviously don't want it to crack again so need to support the turbo correctly - any advice would be great

  8. #8
    Non-member Wallace's Avatar
    Join Date
    Jan 2009
    Location
    herts
    Posts
    1,199
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Forgive me if I'm not understanding properly - but turbo brackets?

    Unless there is something out there that I don't know about (quite likely)

    There is a bracket for the manifold as per pic, but other than that the turbo is fixed to exhaust manifold also as per pic (sorry not the best!)
    Attached Images Attached Images  

  9. #9
    Non-member Wallace's Avatar
    Join Date
    Jan 2009
    Location
    herts
    Posts
    1,199
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    .....
    Attached Images Attached Images  

  10. #10
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    cheers wallace

    I recieved one of the downpipe support brackets yesterday from CGB

    CGB also advise though that there are 3 other brackets - 1 mounts to the air box (havent got an airbox fitted though so forget that one)
    1 mounts to a heat shield and the final one is the turbo support bracket - they said its very rare that a car comes in with one of these fitted as usually they have been disgarded by previous owners when working on the engines - they are looking for one for me now - last thing I want is the weight of the turbo causing the manifold to crack again

  11. #11
    Non-member Brigsy's Avatar
    Join Date
    Sep 2008
    Location
    Redcar
    Posts
    4,138
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Assuming you have an original cast manifold, you wont need the turbo support bracket. No body runs them unless totally o.e, the manifold wont crack without it.

    My tungy has one on and it makes turbo removal a ball breaker.

  12. #12
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    That's the problem - I've got a stainless tubular manifold going on and don't want it to crack again - admittedly there was no down pipe bracket fitted previously whereas I will be fitting that.

    So if fitting a turbular manifold do you think that support bracket is required?

  13. #13
    Non-member Brigsy's Avatar
    Join Date
    Sep 2008
    Location
    Redcar
    Posts
    4,138
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Just bin the tubular manifold mate the standard turbo support wont be enough anyway.

  14. #14
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Seriously??

    Surely it can't be that bad? Is there any way round it then? Uprated mounts etc? CGB said they have had one fitted for about 6 years without any issues

  15. #15
    Non-member Brigsy's Avatar
    Join Date
    Sep 2008
    Location
    Redcar
    Posts
    4,138
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    As far as im aware nobody has seen massive gains, if any at all with a tubular manifold - the only time i would use one is if your radically modifying the engine - i.e. efi, massive turbo and huge power goals. All i hear are tales of cracked manifolds, and even slower spool time in some cases lol

  16. #16
    Non-member Goobie's Avatar
    Join Date
    Mar 2002
    Location
    East Sussex
    Posts
    1,670
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    They may of had one fitted for that long, but doesn't mean it was driven anywhere in that time

    Jokes aside, your need to get creative and make up a support bracket to take the weight of the turbo charger then there will be less stress pulling down on the manifold.

  17. #17
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Well Ive ordered all of the brackets - there are quite a few of them!





    Also in the picture above of the downpipe support there is also supposed to be a metal bar that attaches to block which I havent got so Ive ordered that too

  18. #18
    Non-member Wallace's Avatar
    Join Date
    Jan 2009
    Location
    herts
    Posts
    1,199
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions



    I knew 1 of the 3 existed


    Go for it bracing it can only be a good thing

  19. #19
    Non-member
    Join Date
    Mar 2013
    Posts
    259
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Bob at cgb is adamant that I now have all of the brackets and that there is no way the exhaust or turbo can move about so I'm gonna fit the stainless manifold - if it cracks after all this then sod it ill remove it

  20. #20
    Non-member
    Join Date
    Apr 2011
    Posts
    1,214
    Post Thanks / Like

    Re: Rebuilding rear of engine - couple of questions

    Quote Originally Posted by caymanr26 View Post
    Bob at cgb is adamant that I now have all of the brackets and that there is no way the exhaust or turbo can move about so I'm gonna fit the stainless manifold - if it cracks after all this then sod it ill remove it
    this is what I'll do with mine. I made a bracket that bolts from the elbow down to a gearbox bolt. Good luck

Posting Permissions

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