cam timing made easy? adjustable sprockets
 

I just stumbled across these.

http://cgi.ebay.com/911-930-RSR_W0QQitemZ4618854032QQcategoryZ10408QQcmdZViewI tem

Very slick. I wonder if they will hold timing. Certainly easy to adjust. I assume that you set torque on the cam fixing nut/bolt and then clock the sprocket with the 6 adjusting bolts to set timing.

what would really be nice is if you could adjust it on the fly!

Not a chance thats going into any Porsche I'm responsible for.
Timing is simple with existing cam sprockets.
My problem is all the extra parts spinning around and possibly coming loose.
I would not want a retaining screw and washer going through the cam drive, with all the havoc it would create.
This is not a improvement at all.
Maybe great for the Brit's, they love to tinker with their cars all the time.

These are made in the USA. Found them at JB Racing for $375.00 for the pair, same pictures and part numbers. What are the advantages of having the adjustable sprocket? I agree that there are more parts there but they also claim to be lighter than stock. Anybody used these?

Doug-

This kind of adjustable cam wheel has been around for years... I've not heard of many of them coming apart. Though, on most other makes they are external to the engine oiling system and might not cause severe havoc. Even so, isn't the clearance from sprocket surface to cam housing cover tight enough that the screw may not be allowed out?

Just an academic discussion, really, as I agree with you. We already have adjustable sprockets... in essance :)

Price is way out there too!

-Michael

Michael,
I don't know the answer whether the cam housing cover is close eough to catch a loose screw. Could be.....
I agree with you, the price is way out there.
I see this as another solution without a problem.
I would rather see a system that would automatically advance cam timing within a prescribed parameter.
I would also like a timing chain system for my '76 that uses a 964 and later type takeup for the idle side of the chains, rather than the sprocket wheel pushed against the chain with the tensioners.
Do these and you have my undivided attention.
Don't get me wrong, I like innovation. I just don't see it in this case.