Hello, I would like some help with identifying camshafts that are in a 1979 Ferrari 308 (2 valves per cylinders with carburetors). The measurements that we have taken below are taken with 0.5mm valve clearance. Intake: Opens 45° before top dead center Closes 60° after bottom dead center Total duration 285° Exhaust: Opens 55°before bottom dead center Closes 34° after top dead center Total duration 269° Based on this does anyone know what camshaft is in the engine and what the right timing that should be applied (opening and closing times)? We checked the timings with the standard European and North American camshaft specifications but we couldn't find a match. Thanks in advance.
If the camshafts are original Ferrari parts, they should have the part number forged into each camshaft. Have you rotated the cams to see if the original numbers are present. It would also be good to measure the lobes of the cams to see what the valve lift is to see if it matches the specifications in the manual. From your timing specifications, I would say that you have aftermarket performance cams or regrinds of original Ferrari cams.
The 2 valve 308 GT4 (only 308 manual I have) has the following specs:: Inlet: opens before TDC 34º closes after BDC 46º Exhaust: Opens before BDC 36º closes after TDC 38º My guess (GUESS) is that the exhaust is factory and the intake has been ground.
Those are big durations bordering on what others have posted for the factory P6 cams -- for example: https://www.ferrarichat.com/forum/threads/p6-cam-timing-and-setup-advice.10839/#post-156199 You might get some recommendations by reviewing other "P6 cam" threads, but, for street use, they may be a little troublesome (i.e., lacking in low end torque).
That's what is perplexing me. The intake is similar to P6 but the exhaust is something different. So it's difficult to know a good base setting for when setting up the cams.
A good base setting would be to replace them with known good street cams. 80 degrees of overlap is not what you want.
