Pushrod Rotation

[sdcbowler]

Hi Members,

I have watched some vids of engine rebuilders adjusting their valve trains. They indicate the pushrods rotate during engine operating. It would seem that even with hydraulic lifters the rods would spin while on the low part of the cam lobe but not so much when the lifter is on the crown of the cam lobe. However, the duration is just a millisecond and happens so frequently that it appears the pushrod is in continuous motion. I also assume this is the case for both adjustable and non-adjustable pushrods.....is this the case, or am I way off?

Thx

 

[Xcudame]

Adjustable pushrods are only used to determine the correct length of the pushrods needed for a given engine. Different length pushrods are needed when deviations are made from stock or near stock parameters. Now there are adjustable rockers which are a must for solid camshafts and will work well on hydraulic cams too!

Valves turn, lifters turn, pushrods turn.
"Everything turns, turns, turns" by the Byrds in 1959 I think!

 

[Ricks72Chlgr440]

Adjustable pushrods are only used to determine the correct length of the pushrods needed for a given engine. Different length pushrods are needed when deviations are made from stock or near stock parameters. Now there are adjustable rockers which are a must for solid camshafts and will work well on hydraulic cams too!

Valves turn, lifters turn, pushrods turn.
"Everything turns, turns, turns" by the Byrds in 1959 I think!

From Ecclesiastes chapter 3! Yes SBCBOWLER, the lifters MUST turn or the associated cam lobe & lifter will be damaged. I always thought the taper was at the nose of the cam lobe which made the lifter rotate.

 

[sdcbowler]

Adjustable pushrods are only used to determine the correct length of the pushrods needed for a given engine. Different length pushrods are needed when deviations are made from stock or near stock parameters. Now there are adjustable rockers which are a must for solid camshafts and will work well on hydraulic cams too!

Valves turn, lifters turn, pushrods turn.
"Everything turns, turns, turns" by the Byrds in 1959 I think!

OK,

Got it.

 

[pschlosser]

From Ecclesiastes chapter 3! Yes SBCBOWLER, the lifters MUST turn or the associated cam lobe & lifter will be damaged. I always thought the taper was at the nose of the cam lobe which made the lifter rotate.

Thine OP ask-eth of the pushrods must be a rotate-eth. it is foreseen the lifters must be a rotating to a-polish the camshaft lobe. behold, the pushrod be-eth another matter. wo, unto those who fret that the pushrod motion be in continuous motion, for it matter-eth not, me think-eth.

 

[Chryco Psycho]

Except roller cams !! if the roller rotates you have a very big problem !

 

[MoparCarGuy]

Pushrod rotation is incidental to the lifter's rotation and nothing more. There is no benefit from rotating pushrods on the E-body engines.

 

[tonysrt]

Way off with 1959 with the Byrds, more like late 60's.

 

[Xcudame]

Way off with 1959 with the Byrds, more like late 60's.

Turn! Turn! Turn! - Wikipedia

en.m.wikipedia.org

Written in 1959!

 

[Challenger RTA]

My turn! Someone went down in a burning ring of fire! Sorry tonysrt.
I always wonder if the was a message for Johnny from June in the song, Burning Ring Of Fire?
So few words but so many meanings.

 

[tonysrt]

The Byrds song came out in 1965. May have been written in 59, but probably not aired at that time, especially not the Byrds.

 

[toolmanmike]

Hi Members,

I have watched some vids of engine rebuilders adjusting their valve trains. They indicate the pushrods rotate during engine operating. It would seem that even with hydraulic lifters the rods would spin while on the low part of the cam lobe but not so much when the lifter is on the crown of the cam lobe. However, the duration is just a millisecond and happens so frequently that it appears the pushrod is in continuous motion. I also assume this is the case for both adjustable and non-adjustable pushrods.....is this the case, or am I way off?

Thx

The lifters spin so why not the pushrods? (unless it's a roller cam)