Dynatard

[mrsmackpaul]

16 hours ago, fjh said:

Guess I was pointing out the cam timing is fixed! 

I dunno if this is 100% correct

Yeah I know in the standard parts department this is correct

However on racing type motor for a car you can dial in the cam shaft to make sure it is exactly correct

The use of off set keys to shift the cam slightly is used

Can this be done with a Mack motor ? I dunno, I guess it probably could be

Why would this be important ? well I guess if the cam is slightly retarded it would mean the exhaust valve is opening to late 

Would this be a real issue ?

I dunno, but clearly there are really good and really really bad Dynatards 

Something or a combination of things have to be slightly out and combined make a big difference 

To me the weakest part of the design has to be the rockers that from memory have no O ring to seal the oil in there, this would mean little to no retardation as the hydraulic lash adjuster would struggle to fill with oil and expand 

If this happens the retardation would be at the wrong time 

Anyway, just some thoughts 

 

Paul

[Joey Mack]

Well Paul, since you asked..  As far a cam degrees goes,, it may work. I wonder if setting cam degrees for better performance came later,,  also,, worn parts to me is an issue. IE;  worn piston rings causing lower compression, or the slave Pistons as you mentioned, add in out of adjustment valves, and how about gear selection when engine breaking ? Sometimes I think that because we are driving faster now, and have been driving computer controlled engines for 25+ years, ( Mrs. Mack not included ) that maybe the older systems that worked good back then, basically just SUCK for todays driving needs..  Thoughts 🤔 💭...