![Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin](https://external-preview.redd.it/NcDeOXA8cBHxB07Wa7TPuxObNh14M58mujckixnvA2w.gif?format=png8&s=71f1fbe6070e85f7c390845cb45cae154ad3eae7)
Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin
Where is the camshaft in a radial engine? I've seen radial engines that have cam followers engaging a cam on the crank, but that would open the valves on every rotation -
![Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin](https://thekneeslider.com/images/2010/04/xr600-radial-master-link-rods.jpg)
Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin
![Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin](https://external-preview.redd.it/DdV-c227njZa39OXIYfmROtRzjOwfcscUZDZrQE5W7c.png?format=pjpg&auto=webp&s=9ab635e568a806caecb366a607cdee2805c53a20)
Radial engine timing and cam mechanism. Note the 1-3-5-2-4 firing order and how the upper piston has a master rod with a direct attachment to the crankshaft, while the other pistons pin
![7-cylinder radial engine built from air-cooled VW parts - The Technical Forum - The Autosport Forums 7-cylinder radial engine built from air-cooled VW parts - The Technical Forum - The Autosport Forums](https://i83.servimg.com/u/f83/18/18/99/77/bristo10.jpg)