Quote:
Originally Posted by patrickt
Here's the second lesson I've learned with my FE with the SFT cam: The "gap two valves with 90 degree turns from TBC" method does not work when your cam has 324 degrees of duration seat to seat. The only method that works for me reliably is the EOIC method. When I tried the 90 degree method the results where off as I was not on the heel of the lobe. Now, it wasn't off a whole lot, but it was off. 50 years ago that probably would have been close enough.  |
EOIC is the best method. Exhaust Opening (about 50-90 BBDC), adjust intake valve. Inlet Closing (about 50-90 ABDC), adjust exhaust valve. When doing like this, the engine is generally from 90-110 BTDC or 90-110 ATDC.
But you only do one valve at a time according to the EOIC principle.
Still works with cams of 340 degrees, since the other 380 degrees or so, each valve is closed.
Now working as a mechanic for 40 years, if I come across a solid camshaft that can be adjusted with the engine running, then I will stand corrected.
Until then, I think Fred's engine had a hydraulic cam that was run at near zero lash (zero preload, not a typical 1/2 turn after zero lash). I have run my own hydraulic cams at "zero lash".
From the Corvette forum, for solid lifter camshafts. The 30-30 Duntov is no different to any other camshaft.
https://www.corvetteforum.com/forums...djustment.html