Identify cam shaft in engine

jhelgesen · 07-31-2007, 08:22 AM

I have a mystery 3.0, came with weber 46's, carrera oil sump cover and a euro no vacuum distributor. Tried to identify the pistons with a bore scope, but just saw black. Next item to clarify are the cams.

Will there be a marking on the end of the cams if I pull the chain covers, or is there a number on the shafts somewhere under the valve covers?

Thanks!

304065 · 07-31-2007, 08:48 AM

There may be a mark on the end ("930") but it won't be very specific and I think one would be hard pressed to see the part number on the cam while still installed. Instead, I would measure the valve lift in overlap TDC like you are setting the cam timing BEFORE pulling the engine apart, compare it to the known values for factory cams.

Ken911 · 07-31-2007, 02:15 PM

If they have ever been out of the engine the could have been reground so the id numbers might not mean anything. I have ssc cams in my turbo but they were reground fron stock 930 cores.

DW SD · 08-03-2007, 02:32 PM

measure empirical data (lift vs. angular rotation, lobe separation angle) and cross reference to known cams.

Doug

Rusty Heap · Rusty Heap's Garage

Here are the cam markings as shown on my cams for sale on ebay, just as a reference to you on what to look for in casting/stamping numbers.

Do an ebay search on item: 250152305632

camgrinder · 08-10-2007, 11:31 AM

Those cams look like stock SC cams to me.

Are you wanting $150 for the each side, or do you have two sets of these cams?

Henry Schmidt · Henry Schmidt's Garage

Most cam grinders stamp the end of the cam opposite the chain.
The best way to find out what you have is to put a dial indicator on the number one intake and check lift and duration.
You can cross reference those numbers with stock cams and if it matches a stock cam you shouldn't have to check the exhaust. If it doesn't cross reference then you should check the exhaust and post what you find. At that point John can tell you what you have.
A Carrera sump cover indicates that the engine has had a pump change. That means the engine have been apart and the cams could be anything.

If you have a bore scope you can look at the pistons and if they are a squish camber dome your cam options are limited.

jhelgesen · 08-13-2007, 04:30 AM

Thanks Henry,

I tried the bore scope, but its light was limited and there was a bit of carbon on the pistons, best I could tell at this time is the pistons were standard 3.0's. I'll probably pick the motor up from storage in a week or two so I can do more exploratory work.