Pushrod length HELP
As others pointed out, finding the difference in cam base circle radius and adjusting the pushrod length accordingly would work. BUT, only if the pushrod was setup correctly in the first place on the original cam.
In this case, it sounds like the that was never done correctly, so seems the pushrod length for the new setup just needs to be determined with a pushrod length checker from scratch to do it correctly.
In this case, it sounds like the that was never done correctly, so seems the pushrod length for the new setup just needs to be determined with a pushrod length checker from scratch to do it correctly.
TECH Regular
Joined: Jul 2011
Posts: 452
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On a stock setup with stock pushrods, lifters, and stock cam. When all you are changing to begin with is a cam with a smaller base circle than im pretty sure all you have to do is measure the stock cam base circle and the aftermarket cams base circle and you have the magic pushrod number. I seen Pat G use this method in another thread and it makes alot of sense. Now I just need to figure out how exactly to measure the base circle on the cam.
I was talking about the OP in this thread about not having the correct setup on the pushrods in the first place, so using the base circle radius method wouldn't work if setup that wasn't already correct. In your case, if you are starting with bone stock cam and valve train, then yes the base circle radius method should be an accurate way to do.
I chimed in on your thread about measuring the base circle on the cam.
Last edited by ZeeOSix; Jul 22, 2011 at 01:58 AM.
True ... you can do that, but it's the base circle radius, not diameter you need to use.
I was talking about the OP in this thread about not having the correct setup on the pushrods in the first place, so using the base circle radius method wouldn't work is using a baseline that was already not correct. In your case, if you are starting with bone stock cam and valve train, then yes the base circle radius method should be an accurate way to do.
I chimed in on your thread about measuring the base circle on the cam.
I was talking about the OP in this thread about not having the correct setup on the pushrods in the first place, so using the base circle radius method wouldn't work is using a baseline that was already not correct. In your case, if you are starting with bone stock cam and valve train, then yes the base circle radius method should be an accurate way to do.
I chimed in on your thread about measuring the base circle on the cam.
I've got a pushrod length checker I've just all ready got it together and from pulling the cover I seen this and i didn't know if that was a way of telling if they were close to being correct length or not. The reason i just ordered a set based off other people was because he wasn't sure how to measure. When he measured i ended up with a shorter than stock rod and everyone else ended up longer so i knew it wasn't right. I know when using the pushrod length checker (comp cams) every turn is .050. But all this about zero lash and preload and base circle just confuses the hell out of me. With the checker what do i need to do to check it properly.
Note that there are several ways to verify the pushrod length and each will provide similar results.
