This video shows a 1920 Napier six-cylinder running engine. This engine is running with a two-piece aluminum billet water cooled replacement cylinder head. The billet cylinder head is a complete B&T “in-house build.” Roberts auto design consultants did all the billet cylinder head CAD design work. The original cylinder ports, head-bolt pattern and cooling passages are all asymmetrical.
Rick Roberts redesigned the intake and exhaust ports. Rick made all the ports symmetrical. He made the new water cooling passages symmetrical. Think about that. Rick’s CAD model has the original locations for the boltholes, valve train ports, etc. The original “intake manifold” and plenum are a poor design. The new two-piece billet cylinder head has a good intake plenum design. Rick sent a “complete single cylinder” to Darren @ LS brackets. (Darren is XRV10 LS engines.) Darren made a blue plastic 3D printing of the new Napier single cylinder “model.” This 3D plastic model is an exact copy of a single Napier cylinder. I digitized all sections of this plastic model. I used this “code” to machine the two billet halves. I assembled both halves. The two-piece billet cylinder head pressure tests to 125 P.S.I.
Roberts Automotive Design Consultants supplied C.F.D.-generated valve job specs. Paul Tester did all the valve seat and guide work. I’ll post more 1920 Napier billet cylinder head pics and videos. I can build anything you want. What can I build for you?