It's actually not too bad. Because the rockers have to be bored for the bushings anyway, they can put those bushings right where they need them, correcting for both rocker sweep and ratio at the same time.
Which rocker arms would you run?
- Thread starter oliver
- Start date
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It's actually not too bad. Because the rockers have to be bored for the bushings anyway, they can put those bushings right where they need them, correcting for both rocker sweep and ratio at the same time.
In reality there is no real straight answer to bushing a rocker to make it right,since to actualy make it right it needs to be done custom on each rocker and to each valve on each head.
The reason is that a less than perfect sweep comes from a whole bunch of tolerances stacking up.
Rollertipped rockers has an advantage in that even if they are alitle of center on the valve they are not trying to push or pull the valve anywhere from friciton.
To the op,check what rockers clears your springs and retainers,dont take this for granted just check it,you dont even need to rotate the engine to see it,just lay the shafts in the stands,the point of contact is usualy betwen the retainer and underside of the rocker in the corner where rockerarm meets the shaft. who knows you may be able to shorten your list of possible rockers by just doing this.
Im still a Crane golds fan.
The reason is that a less than perfect sweep comes from a whole bunch of tolerances stacking up.
Rollertipped rockers has an advantage in that even if they are alitle of center on the valve they are not trying to push or pull the valve anywhere from friciton.
To the op,check what rockers clears your springs and retainers,dont take this for granted just check it,you dont even need to rotate the engine to see it,just lay the shafts in the stands,the point of contact is usualy betwen the retainer and underside of the rocker in the corner where rockerarm meets the shaft. who knows you may be able to shorten your list of possible rockers by just doing this.
Im still a Crane golds fan.
Wyrmrider
Well-Known Member
yr said "not always" oops answering a page 1 comment - oh well
and you can have two problems that cancel each other out and thus appear to be ok
IF your shafts are TOO LOW for proper geometry (valves too long, roller tip rockers)
You get MORE LIFT (but problem is you can get fling/ float over the nose) also more chance of rocker hitting retainer and more side leverage on the closed valve with iron rockers
There are trade-offs shaft high or shaft low- both progressively worse the further off you are I've never seen Shaft High
However Bottom Line- you get more area under the curve with the mid lift method
and you can have two problems that cancel each other out and thus appear to be ok
IF your shafts are TOO LOW for proper geometry (valves too long, roller tip rockers)
You get MORE LIFT (but problem is you can get fling/ float over the nose) also more chance of rocker hitting retainer and more side leverage on the closed valve with iron rockers
There are trade-offs shaft high or shaft low- both progressively worse the further off you are I've never seen Shaft High
However Bottom Line- you get more area under the curve with the mid lift method
Wyrmrider
Well-Known Member
you can make them "more right" move the bushing over closer to the adjuster
put in FORD adjusters and move them closer to the bushing
weld up the adjuster threads and move them
Been there- done that
Many iron rockers are less than 1.5 and it takes some work to even get to 1.5
put in FORD adjusters and move them closer to the bushing
weld up the adjuster threads and move them
Been there- done that
Many iron rockers are less than 1.5 and it takes some work to even get to 1.5
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