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  1. JRR

    Socket heads or hexagon heads

    I am building George Britnell’s Holt 75. In order to keep it as close as possible to the original design my question is were socket cap screws or hexagon heads used in its construction?
  2. JRR

    Holt tractor engine

    G’ Day George I am also interested in purchasing a set of drawings for the Holt. Please add my name to the “gunner buy” list. Regards John Bannockburn Vic Australia
  3. JRR

    Vee 8

    I have but it’s of poor quality.I will do another next time I run it John
  4. JRR

    Vee 8

    Since I recently finished building a quarter scale Merlin I was looking for the next project and came across this vee 8 in the English Model Engineer. The only problem was it was too small for me so I built it twice the size . It was only after I had finished it I found out that the Model...
  5. Wheelcase Merlin
  6. JRR

    Merlin V12

    Hi Terry You are quite right I have no details of the valve springs , so I wound mine up out of .035 dia wire with a pitch of .1 & a length .625, it worked for me. That was a challenge making the timing change cover ,even more so when you come to thread in the chain with a length of string...
  7. JRR

    Merlin V12

    Hi Terry I am pleased you liked the hex on the camshaft, you won't regret doing it . Just make it a little bit longer. As for the camshafts, I think you should make them in one piece, although I can understand your reluctance to milling them on a conventional dividing head as the chances of a...
  8. JRR

    Merlin V12

    Hi Terry I am pleased you liked the hex on the camshaft, you won't regret doing it . Just make it a little bit longer. As for the camshafts, I think you should make them in one piece, although I can understand your reluctance to milling them on a conventional dividing head as the chances of a...
  9. JRR

    Merlin V12

    Hi Terry I see that you are going to start on the camshafts . Might I suggest that you mill a hexagon on the end of each shaft ,it will make it easier to set the timing as you need to rotate the shaft before you lock up the screws on the sprockets. John
  10. JRR

    Merlin V12

    Terry, I put the valve seat directly into the head and I think I used the 30/45 angles,it makes a lot of sense when you think about it because it will give a very narrow seat. I have made a tool using a round India stone dressed with an angle of 45 bonded to a length of .125 drill rod about 2...
  11. JRR

    Merlin V12

    Hi Terry This was my solution to the carby on the Merlin and my alteration to the slip clutch. I have put some pictures of my engines in photos. John
  12. BENTLEY BR2
  13. Just some of the engines I have built

    Just some of the engines I have built

    DH CIRRUS
  14. Just some of the engines I have built

    Just some of the engines I have built

    KINNER 100cc
  15. Just some of the engines I have built

    Just some of the engines I have built

    JEMMA 137cc
  16. Just some of the engines I have built

    Just some of the engines I have built

    HODGSON 18
  17. Just some of the engines I have built

    Just some of the engines I have built

    BARR & STROUD Motorcycle engine 11.3 cc Sleeve valve
  18. Just some of the engines I have built

    Just some of the engines I have built

    WRIGHT J5 125cc
  19. JRR

    Merlin V12

    Greg Yes this my engine.It was posted by a friend of mine.I didn't know he had sent it until he introduced me to HMEM. I am very pleased he did. John
  20. JRR

    Merlin V12

    Terry I've taken on boarded all what you say, it all makes a lot of sense . I had though of making some changes to the position of the radiators so I think I will have to remove it from the "to hard basket " and change things around. I would love show you some picture of my engines ( I wouldn't...
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