Thanks to this forum and Bruce Longman, I am pleased to report that my iron 4g now runs and although not yet used under load, has consumed a few pints of petrol over a number of runnings and seems to be freeing up nicely. I used the =+ 0.060 AE16179 pistons previously mentioned in front bores with 0...

I forgot this one and is also about the orientation of components. The connecting rods on my iron 4g are the later with the shell bearings. Are there any thoughts which way round they should be fitted to the crank in relation to the shell indents on rod and cap, which are on the same side of each as...

Following my post back in july re pistons for my iron 4g, that had been bored and little ends re bushed, to take + 040 BMC pistons and then left to rust, I located a set of nos + 060 BMC pistons after months of searching. Got them from Bruce Longman (why did I not try him sooner) together with other...

Thanks Roy. Standard bore size as you know for the square 4 is 65mm. Some BMC A series engines are 64.5mm, the 0.5mm difference equating to approximately 20 thou. As I see it, even if I use +.060 BMC pistons, I am still at + .040 on the "Ariel" size, leaving another rebore to +.060 "A...

Hello, this is my first post. Last August I took over a VERY long term project, being a 1947 rigid/teles 4G. This is my first Ariel and now looks like a motor bike again. A good deal of the engineering work such as crank regrinding and reboring had originally been done, but unfortunately the cylinde...