Saturday, January 23, 2016

The cam the myth the concept

I have the engine in my Ford Model A coupe apart to hunt down a scary noise and also do some work I didn't have time for when I built it. The noise proved to be a blown head gasket so no big deal.

But what I wanted to show here is the cam I'm running. Looks innocent at first glance but there is something unusual about it.

It's a high lift cam to say the least, compared to a stock Model A/B cam

Yes the lobes are in fact so tall the cam cannot be mounted thru the cam bearings. It's a trick split cam. I was discussing camshafts and the possibility to grind tall lifts on stock cores with a guy I know. My Idea was to bore the cam bearings larger and somehow insert bushings after the cam was in place or make a new core with bigger bearing journals (which is now available by the way). But my friend came up with this neat split cam solution. I think it's lovely in many ways. It has given me the option to run a more modern high lift cam profile with reasonable short duration. There was no need to modify the engine block. Well that's not really true, but the modifications is made because of the combination of components I used. But one of the most interesting things about this cam is the engineering and machining. I think it's a masterpiece. A new solution for an old problem.

This is how it looks apart

It has held up good for the 5-6000 km I have used it. I did fail to run it in properly sine the engine wouldn't run good on first start up. Also in combination with super stiff Iskenderian Flathead valve springs, oil with to low zinc content and possibly lifters of low quality. So the nose of the lobes got a beating. But since then nothing has happened.

Here's two short clips of me drag racing. The roadster had an overhead conversion Ford Model B engine. I use a flathead Model B with this cam.

Go to if you want your own split cam. But don't order one wilder than mine. I don't want anyone being faster.

OK! Wrench and repeat.

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