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 Post subject: Pushrod length
PostPosted: Sat Feb 24, 2018 1:51 pm 
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Joined: Tue Oct 30, 2012 6:01 pm
Posts: 237
Location: Massachusetts
Was wondering if someone could explain how to determine the proper way to achieve the correct pushrod length when using a hydraulic roller lifter. Since all of my past engines have been solid flat tappet, this new motor Brent is doing the short block for me is my first hydraulic roller lifter. Do I need a solid roller lifter to get the right length? and how do you compensate for the preload that is needed for the hydraulic roller.


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 Post subject: Re: Pushrod length
PostPosted: Sat Feb 24, 2018 2:03 pm 
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Joined: Mon Oct 29, 2012 9:05 am
Posts: 2385
Unfortunately, you can't use a solid because the majority of the solid roller lifters are different length than the hydraulic rollers.

The way I do it is like this:

I bottom the plunger out in the lifter with the adjustable pushrod so that you're essentially making it solid. You then adjust the length of the pushrod to get the rocker arm pattern that you want. Once you get it where you want it, you leave the poly lock in the same place so that the rocker arm doesn't lose its position on the stud, and adjust the length of the pushrod until you get the amount of preload that you want in the lifter. So you're basically leaving the rocker arm in the same spot, but you're adjusting the pushrod length until the plunger starts to come back in the lifter and gets to about .050-.060" from underneath the circlip.

Clear as mud?

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brent@lykinsmotorsports.com


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 Post subject: Re: Pushrod length
PostPosted: Sat Feb 24, 2018 2:27 pm 
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Joined: Tue Oct 30, 2012 6:01 pm
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Location: Massachusetts
No, I get it, but is the spring in the plunger stronger than the checking spring on the valve? Or maybe you don't use a checking spring?

I was looking at this video the other day......
https://www.youtube.com/watch?time_cont ... 5is9BsH5OU


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 Post subject: Re: Pushrod length
PostPosted: Sat Feb 24, 2018 2:45 pm 
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I don't use a checking spring.

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