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Head gaskets don't match on water jackets?!?!?!?

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    #1

    Head gaskets don't match on water jackets?!?!?!?

    Hi replacing my head gaskets again after last rebuild 800 miles ago, have heads off and im using the same gaskets as last time the thicker type from paddocks non payen type. Noticed that the gaskets have small holes rather than full sized water jackets im sure this is correct and to slow down flow or something. Are the payen gaskets different? If this is the norm then i will put it back together, couldn't find any other treads on this and can't remember what the original gaskets were like.

    Thanks in advance

    Paul


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    #2
    imported post

    Hi Paul

    As far as i can remember the original gaskets have a small hole over a large water gallery on certain cylinders and this was, as you say, to control the water flow around the head, as to it's merits i can't comment but from my limited knowledge of thermo dynamics coolant flow is managed by using a series of baffle holes that allow or restrict coolant flow retaining the optimum engine temperature - so in my opinion don't modify them and ensure they are as per original specification!

    But i am open to contradiction

    Quote from Rally Design

    And a note of caution! Enlarging gasket water-way holes will not improve cooling efficiency. The size, number and position of these holes has been finely calculated by the engine and gasket designers and any alteration may propagate localised overheating and premature engine failure.

    http://www.rallydesign.co.uk/cylinderhead.php

    Gary

    Comment

      #3
      imported post

      GTJones wrote:
      The size, number and position of these holes has been finely calculated by the engine and gasket designers
      I can just imagine Triumph's designers poring over the fag packet now

      Dave
      Dave
      1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

      Comment

        #4
        imported post

        DJT wrote:
        GTJones wrote:
        The size, number and position of these holes has been finely calculated by the engine and gasket designers
        I can just imagine Triumph's designers poring over the fag packet now

        Dave
        Hi Dave

        Smokey back room in some pub in Longbridge - same place they designed the "Easily removable Hard Top"

        Gary

        Comment

          #5
          imported post

          Hi Paul

          I replaced mine recently and I used Payen. They did have a few round holes where the holes in the block / head were oval, so your gaskets sound fine.

          Brian
          Drive a Stag every day... it's wonderful!

          Comment

            #6
            imported post

            GTJones wrote:
            Smokey back room in some pub in Longbridge - same place they designed the "Easily removable Hard Top"
            Not much in Longbridge now it seems. I was in Birmingham last weekend and drove through Longbridge. Bl**dy great open space there now where the factories used to be.

            Several years ago I had to attend a course at a factory unit on what used to be the old MG Abingdon works , and last week I had to order some chemicals from a company that is on Herald Way, Coventry, part of the old Triumph factory site.

            Depressing isn't it?

            Dave
            Dave
            1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

            Comment

              #7
              imported post

              DJT wrote:

              and last week I had to order some chemicals from a company that is on Herald Way, Coventry, part of the old Triumph factory site.

              I think there is a Spitfire Close, Herald Ave, Dolomite Ave, and Vitesse something in Canley.

              ...........Andy

              Comment

                #8
                imported post

                Andy Rundell wrote:
                DJT wrote:

                and last week I had to order some chemicals from a company that is on Herald Way, Coventry, part of the old Triumph factory site.

                I think there is a Spitfire Close, Herald Ave, Dolomite Ave, and Vitesse something in Canley.

                ...........Andy
                Add to that Toledo Close, Renown Ave and Vanguard Ave

                Comment

                  #9
                  imported post

                  Andy Rundell wrote:
                  Andy Rundell wrote:
                  DJT wrote:

                  and last week I had to order some chemicals from a company that is on Herald Way, Coventry, part of the old Triumph factory site.

                  I think there is a Spitfire Close, Herald Ave, Dolomite Ave, and Vitesse something in Canley.

                  ...........Andy
                  Add to that Toledo Close, Renown Ave and Vanguard Ave


                  MK 3 GT6 Crescent, Martin.

                  Comment

                    #10
                    imported post

                    Martin Stevenson wrote:



                    MK 3 GT6 Crescent, Martin.
                    Is that a postcode?
                    ZF 4 spd box, Datsun shafts, SS exhaust, 38DGMS weber 158.9bhp, BMW MC Tomcat seatssigpic

                    Comment

                      #11
                      imported post

                      Cheers guys just as I thought! Will put it all back together, just have to find out why they blew in the first place! oh the joys of stag ownership

                      Cheers

                      Paul


                      Comment

                        #12
                        imported post

                        Gentlemen,
                        There's a distinct danger of offending some of us true blue Coventrians here. Clearly the Stag was designed at Triumph's Engineering Centre at Canley, Coventry not at the Longbridge, Brummidgeham site belonging (at that time) to Rover Cars Ltd.
                        The Canley site does indeed have it's roads now named after Triumph models, including Herald Avenue but interestingly not a sign of a Stag. Herald Way is actually on the other side of Coventry (Binley) on another industrial estate built whilst the car was still in production (I think) on the site of what was a coal mine. There is a whole Stag Industrial Estate in yet another part of the city.

                        Adie
                        Non-historian, anally retentive, Triumph detail conscious...... Coventry born and proud of it!

                        Comment

                          #13
                          imported post

                          adieturner wrote:
                          Herald Way is actually on the other side of Coventry (Binley) on another industrial estate built whilst the car was still in production (I think) on the site of what was a coal mine. There is a whole Stag Industrial Estate in yet another part of the city.
                          I stand corrected, Adie. No offence intended.

                          Dave
                          Dave
                          1974 Mk2, ZF Auto, 3.45 Diff, Datsun Driveshafts. Stag owner/maintainer since 1989.

                          Comment

                            #14
                            imported post

                            adieturner wrote:
                            Gentlemen,
                            There's a distinct danger of offending some of us true blue Coventrians here. Clearly the Stag was designed at Triumph's Engineering Centre at Canley, Coventry not at the Longbridge, Brummidgeham site belonging (at that time) to Rover Cars Ltd.
                            The Canley site does indeed have it's roads now named after Triumph models, including Herald Avenue but interestingly not a sign of a Stag. Herald Way is actually on the other side of Coventry (Binley) on another industrial estate built whilst the car was still in production (I think) on the site of what was a coal mine. There is a whole Stag Industrial Estate in yet another part of the city.

                            Adie
                            Non-historian, anally retentive, Triumph detail conscious...... Coventry born and proud of it!
                            Hi Adie

                            Perhaps name a no through road after some stag waterways.

                            Mark

                            Comment

                              #15
                              imported post

                              absolutely none taken Dave......I just thought you might want the accurate version:P

                              Comment

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