Hi all I wanted to share a project that is a long time coming.

This all started back in high school. A buddy of mine had come across a company that had a design for rotary valve heads for a small block ford with some impressive claims. I always thought it was pretty cool. Years go by but I never forgot about it and periodically spent long hours searching the end of the internet looking at rotary valve head designs and checking on the latest developments of that company. I then go to college for an engineering degree and managed to talk the school into doing a directed study for which I would design a rotary valve cylinder head for credit to satisfy some technical elective credits for my degree. I went out and bought 4hp horizontal shaft engine and designed a cylinder head for it. In another class I designed and built a engine test stand dyno for the engine. I worked in the student machine shop at the school and was able to get most of the machine work on the new head design done but was not able to get it finished before I graduated. After graduating I bought a used small Grizzly knee mill that was converted to CNC and a manual lathe. After much work I had a prototype that started and ran but left much to be desired. During this time I exchanged some emails and phone calls with the company that had the rotary valve head design. I was very interested in being a part of bringing the technology to market and eager to work with them. I told them I wanted to see a working prototype I could test out and they were not interested in that. They told me non-exclusive US only patent rights was going to be on the order of several million dollars. After a few more emails with them trying to get them to work with me I gave up on them. Personally I think the whole company is a scam but I was still intrigued by the idea of rotary valve. I then changed direction in occupation which landed me overseas for a year during which time I had no shop to work on the new prototype. Since then the patents I was interested in expired so I figured game on! My plan was to work on the small engine some more or go straight to doing a car engine. Two different co-workers I made friends with convinced me the 4G63 engine would be a great candidate for such a design. I took their advice and bought a used head off of ebay and spent the next year drawing up the stock head in CAD and the new rotary valve head design.

Fast forward a year and I got back to the US and started setting up a shop. I built a furnace and started learning how to cast aluminum. bought a full size knee mill I converted to CNC that was big enough to do the machine work for the new head design. After tying to balance a marriage and a long commute to my day job and long hours as an engineer I convinced my wife to take a year off from work to work full time on the project. It was really tough going and a really steep learning curve but I finally see the light at the end of the tunnel. So now over a year later and having taken longer than estimated and costing a small fortune; my eighth head casting, so far seems to be usable and is just about ready to start up for the first time.

Here is the cylinder head casting next to the sand molds



Here is the head installed just about ready to go but with all the wiring.



There are more pictures here
Adam Goldenstein (@goldenfabllc) • Instagram photos and videos
Goldenstein Engineering and Fabrication LLC - Photos | Facebook


and I have made some videos of the design casting process here https://www.youtube.com/playlist?lis...n9nTqobBVVkN9j