Automotive and Theory > Engine Theory

Williams Helical Camshaft


Came across something rather interesting today. Imagine a camshaft that has indefinate adjustability in it's duration!! A coaxial helical camshaft! Not that it would work in the limited space of a 4AGE head, but just the idea is awesome! Check it out!

What is this sorcery?! Going to look at the link when I get home tonight

I have seen this cam system develop from design to testing as the Helical Cam place is near where I live.   It runs and performs just as you see it on the website - the fuel savings at part throttle are amazing but as HC themselves say - it may not be quite so spectacular with a full-size EFI engine.   
 As you say it won't fit a 4AGE Toyota.   The head layout has to be something like the Nissan SR series of engines - which has slightly unusual valve gear - four lobes on each cam, forked finger followers etc.   I have been told by HC that they are planning to build a system to fit the SR series engine.  If I remember correctly - the SR puts out a bit more power than the equivalent inverted bucket type of Nissan engine.   Realistically I think any engine with the HC would have to have a new head with something like the Nissan SR/SuzukiGSX valve gear layout.       


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