Hispano Suiza V8

Quote from: RReidBack on page 6 of this thread is a brief discussion of the clever and patented H-S adjustable valve tappet assembly, and whether I could or should try to replicate it in my build. In the end I settled on a good suggestion from Mike (Vixen) that is much simpler to make and more robust at this size, while still retaining a reasonably accurate appearance.

Must be winter (or end of summer chores) coming in your parts too LOL.
Its not quite clear to me how the parts function, can you elaborate. I see a threaded portion on the steel top cap, but how is it retained rotationally in the valve? Is the brass cup some kind of sliding bushing? ... that also retains the spring?

Hello AVTUR, CNR, and Mike - good to hear from you all, and Thanks!

Hello Peter - The threaded top cap represents the adjusting cap of the full size originals. In my case it is screwed down hard, so rotation is not a concern. The spring cup does ride partly within the valve bore, thereby absorbing the side load as the cam sweeps across.

I started making those notches using a slitting saw, since that was on hand. But it's no longer as sharp as it once was (like me), so I will order some 0.032" end mills to do that job with. I also need to order a fresher 1-72 threading die. So with that I've switched to making up some valves.

Glad to see you back on this build  The valves and cam followers look good   

Very happy to see new progress on this Amazing Project   

Per           

Interesting project!

Offtopic, last week visit National Military Museum in Soesterberg NL. First time saw the a huge Hispano engine not the V8 but a V12, and a Merlin and rotary and radial engines.

Fascinating display!

Hi Roger, Hi Per. Thank you both!

Thank you for those photos, Alex. The V-12 was a logical development derived from the V8, and the family resemblance clearly shows in those pictures.