Shaft mounted rockers?
#1
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Shaft mounted rockers?
So am I correct in understanding that when running shaft mounted rockers, it is easier on the valvetrain when going from a 1.6 ratio to 1.7? I think I read because of the different geometry there is less side load on the valve guides.
Plus something about this set-up giving the valve a slightly wider arc (if looking at a graph) while moving to full lift and back to the seat again. Anyone have experience with this. Thanks
Plus something about this set-up giving the valve a slightly wider arc (if looking at a graph) while moving to full lift and back to the seat again. Anyone have experience with this. Thanks
#2
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There is some truth to your statements, but from my experience, the real reason(s) to consider running shaft mount rocker arm system such as Jesel or T & D is:
1. Eliminate the need for a stud girdle if running a very high lift cam
2. Valve train stability when running extreamly high rpms or mildly high rmps over a long period of time
3. Required when using certain aftermarket heads due to changed valve location/angles
That's not to say that a shaft mounted system isn't a good investment, it's just more expensive than the conventional set-up and in a lot of cases, overkill.
Something to note-On a solid roller cam application .800" lift motor using a jesel system, checking the valve lash between every pass never required adjustment (after initial adjustment obviously).
1. Eliminate the need for a stud girdle if running a very high lift cam
2. Valve train stability when running extreamly high rpms or mildly high rmps over a long period of time
3. Required when using certain aftermarket heads due to changed valve location/angles
That's not to say that a shaft mounted system isn't a good investment, it's just more expensive than the conventional set-up and in a lot of cases, overkill.
Something to note-On a solid roller cam application .800" lift motor using a jesel system, checking the valve lash between every pass never required adjustment (after initial adjustment obviously).
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Thanks guys. I know it will be overkill, but I like having the option of increasing the lift and valve movement without changing cams. Plus I can use a slightly higher ratio on the exhaust side to help the nitrous a little.