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At the end I used a 0.08 preload with the 7.37 pushrods.
Now ive decided to get new lifers. Im at the point where I have to measure lenght again but this time the timing cover is on and I dont know where to start measuring or figuring out if im on the compression stroke when finding TDC.
I was wondering is it possible to figure out my new lenght with math alone??
I placed my old lifters on the table and stuck in the pushrod and measured overall lenght. I did this on all of them and they average at 9.685.
Did the same thing with the new morel lifters and they averaged 9.762.
So the difference is 0.077.
With the new morels id like to run 0.055 preload.
Is there a way we can find the right lenght by using this comparison??
Thanks
Last edited by Georgies; Jul 26, 2019 at 11:48 PM.
Id need some help to also figure out hop to be on the compression stroke. Im assuming its when the piston is on its way up and both lifters are at the lowest point??
What do you guys think about shortening pushrod checker and tightening rocker to 22ft then opening pushrod checker to get zero lash vs doing it snug and going in and out?
Watch your intake valve while turning the crank by inserting a pushrod on the intake lifter. When the intake opens and then closes (you will need to keep pushing the pushrod down to follow the cam) you are approximately 1/3 turn from TDC on the firing stroke. Once you get the piston to the top you are good to measure, just make sure you push the lifters down so you have good contact Not sure if you can see the piston, I have a borescope that shows the video on my iPhone that I can check position with. Some use a straw to feel for the piston. You can put a dab of paint at 12 o’clock on the harmonic damper for future reference once you get the piston positioned correctly if checking cylinder #1.
Watch your intake valve while turning the crank by inserting a pushrod on the intake lifter. When the intake opens and then closes (you will need to keep pushing the pushrod down to follow the cam) you are approximately 1/3 turn from TDC on the firing stroke. Once you get the piston to the top you are good to measure, just make sure you push the lifters down so you have good contact Not sure if you can see the piston, I have a borescope that shows the video on my iPhone that I can check position with. Some use a straw to feel for the piston. You can put a dab of paint at 12 o’clock on the harmonic damper for future reference once you get the piston positioned correctly if checking cylinder #1.
So kt does matter then. I thought it would make a difference where the piston is at since we are taking measurements from the cam... this is more confusing now.
Whats the difference between firing stroke vs compression stroke?
Compression stroke, especially with an aftermarket cam, may have some overlap such that the valves are partially open. That is why some use the method of watching one valve and measuring the other because it ensures the valve being measured is closed such as suggested by mykream in his post.
Compression stroke, especially with an aftermarket cam, may have some overlap such that the valves are partially open. That is why some use the method of watching one valve and measuring the other because it ensures the valve being measured is closed such as suggested by mykream in his post.
How can i tell if my MS4 cam has lots of over overlap or not?? Any specs on the cam card?
Last edited by Georgies; Jul 25, 2019 at 07:21 PM.
These are my results with the EOIC method with the pushrod checker measured tip to tip.
My cam has a 0.02 difference from intake base circle to exhaust base circle.
Something doesnt make sense... my previous measurements with stock lifters were very close to these... i should be much shorter from what i understand.
These are my results with the EOIC method with the pushrod checker measured tip to tip.
My cam has a 0.02 difference from intake base circle to exhaust base circle.
Something doesnt make sense... my previous measurements with stock lifters were very close to these... i should be much shorter from what i understand.
According to this with the .055 preload i want to run i averaged the size to 7.29. So that would make a total length of 7.345.
My old pushrods are 7.37. Should i get new rods or live with .08 preload?
Vettnuts, what length pushrods are you using with your setup?
You won't have the same length. I am using Yella Terra rockers and have shimmed them for a correct wipe pattern. As a result, my pushrods are longer than most.
Last edited by vettenuts; Jul 30, 2019 at 07:48 AM.
Pushrod measuring questions
