Shaft mounted rockers?
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From: Carol Stream Il.
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
Staging Lane
Joined: Feb 2006
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From: St. Charles, IL
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).
much better in every way,it will be a few bux more expensive than just doing rockers,7/16 studs.
as mentioned above,less frequent valve adj.on mech camshaft,keeps the geometry in line with less flex...many more pros than cons!
as mentioned above,less frequent valve adj.on mech camshaft,keeps the geometry in line with less flex...many more pros than cons!
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From: Carol Stream Il.
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.
