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Roller lifter side load: pushrod angle vs offset pushrod seat

General engine tech -- Drag Racing to Circle Track

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BradH
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Roller lifter side load: pushrod angle vs offset pushrod seat

Post by BradH » Tue Oct 08, 2019 12:54 pm

On another forum there was a discussion on using offset rocker arms with standard (centered) vs offset-pushrod-seat roller lifters.

Someone asked if the side load on the lifter is worse if the pushrod seat is centered w/ a more angled pushrod or when the pushrod seat is offset w/ a less angled pushrod.

My simplistic perspective is the lifter's going to get side-loaded regardless, but don't know the physics behind the question to understand which is the more problematic config. Thanks - Brad

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Stan Weiss
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Re: Roller lifter side load: pushrod angle vs offset pushrod seat

Post by Stan Weiss » Tue Oct 08, 2019 2:18 pm

Maybe Mike has a simplistic answer I have never found one.

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Re: Roller lifter side load: pushrod angle vs offset pushrod seat

Post by BobbyB » Tue Oct 08, 2019 2:27 pm

BradH wrote:
Tue Oct 08, 2019 12:54 pm
On another forum there was a discussion on using offset rocker arms with standard (centered) vs offset-pushrod-seat roller lifters.

Someone asked if the side load on the lifter is worse if the pushrod seat is centered w/ a more angled pushrod or when the pushrod seat is offset w/ a less angled pushrod.

My simplistic perspective is the lifter's going to get side-loaded regardless, but don't know the physics behind the question to understand which is the more problematic config. Thanks - Brad
More pushrod angle will cause more lifter sideload. However, this does not mean the lifter can't handle the sideload. I don't think you can necessarily say either way is better than the other.

Walter R. Malik
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Re: Roller lifter side load: pushrod angle vs offset pushrod seat

Post by Walter R. Malik » Tue Oct 08, 2019 3:40 pm

A roller lifter with an offset pushrod button will exhibit less side load but, a certain amount of twisting force will be introduced.
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CamKing
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Re: Roller lifter side load: pushrod angle vs offset pushrod seat

Post by CamKing » Tue Oct 08, 2019 3:49 pm

An offset pushrod seat is better for the pushrod.
A centered pushrod set is better for the lifter.
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BradH
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Re: Roller lifter side load: pushrod angle vs offset pushrod seat

Post by BradH » Wed Oct 09, 2019 8:43 am

Good replies; thanks - Brad

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