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All components of both engines are designed full scale.

I haven't posted anything for a while. I got a little burned out when I was doing the animation that I posted on youtube. Here is a view of the 12 Cyl SOHC engine based on the 911 heads and valvetrain. I haven't done much on it lately, but I'm going to get back into it now. Mark

In answer to some questions about my earlier post about the perfect 917 engine for a replica: I evaluated many many different options for the engine layout including a close replica to the original, cam drive in the middle with chains, and SOHC with cam drive and power take-off on the ends of...

This is my idea of the ideal engine for the RCR917. It is based on Porsche 2.7L components, Heads, Cylinders, Connecting Rods. Most other components are custom. It could displace between 4.9 and 5.4L. 500 Hp should be no problem. I'm about 75% done with the design. Hopefully someday I will be in...

Hi Patrick, You are absolutely correct. An engine based on a 911 would be more practical if not historically accurate. In fact, I originally started this project by adapting parts from the 2.7 liter engine, and I have quite a bit of that engine designed. It uses the 2.7L heads, has chain...

I finished the animated engine and posted the video of it on YouTube. Follow the link below to view it. YouTube - PORSCHE 917 ENGINE ANIMATION

Here are two more rendered images showing the Camshaft Housing. The first is of the raw 'casting', the second shows the machined finished part.

In response to the question of whether this engine could be built, the answer is yes. All the components that are shown in the renderings were created in SolidWorks, and the 3D models could be used directly to produce machined components such gears and camshafts, or used to produce the patterns...

Here is the latest image of the 3-D model of the 917 engine. It's fairly complete at this point. I have decided to create an animation of the engine, showing the internal components in motion, that's why the engine is cut away. When it's done I will post it here. I am also going to render this...

I haven't had hands-on access to any parts for the 917 engine. It was all done mostly from pictures from various sources. I do have a 60's 911 engine that was useful for getting some details of the design from. Things such as bore spacing and cooling fin detail on the heads were referenced from...

Here are a couple more rendered images of the 917 engine. One is the head assembly the other is a head cross section. Mark

I thought some of you might be interested in this. The 917 engine has always intrigued me, so several years ago I began modeling the engine using 3D design software. This is an rendering of a portion of that solid model. This is a result of quite a bit of research, including a trip to Stutgart...