Recent content by JRR

Hi Mark I must apologise for hijacking your thread.As soon as I find out how to remove it I will do so. Please do not think I did deliberately.Now I know I should have start my own thread. John

Hello George' I have no idea how to take my posting down. As you can see computing is not a natural with me I really did not realise I had intruded on Mark's site. I thought it was just a general posting. When this is sorted I will begin a new thread. John

I am astonished at the response I have had to my Holt 75 post. I didn’t realise I would tread on anyone’s toes.I just built it and posted as I have done before. John

Hi George I finished the Holt 75 yesterday.Many thanks for a fine design although I did make a few changes as you will no doubt spot.After I fixed an air leak in the intake manifold it started straight away and ran well , responded well to the governor and had a lovely exaust sound. Thanks also...

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?

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

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

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...

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...

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...

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...

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

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...

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

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