Pushrod Question
#31
10-05-2014, 11:12 AM
Therein lies the problem. With the rocker and adjustable pushrod installed, the roller tip of the rocker sits on the edge of the valve stem on the intake side. Extending the adjustable pushrod moves the roller to towards the center of the valve stem, where it should be. But it compresses the valve, resulting in the valve never being completely closed. This link shows the installation process by another manufacturer of a similar product. I've sent Hughes an email asking for clarification. It'll be interesting to see what they say.
How to install Yella Terra High Performance Rolle…:
Ken
How to install Yella Terra High Performance Rolle…:
Ken
#32
10-05-2014, 11:28 AM
#33
10-05-2014, 05:27 PM
What are you doing....?
Back away from the LS1 video, it's NOT how you install your Hughes Rockers, they are not similar in their installation at all, the LS1 rockers in the video are non adjustable rockers, your Hughes Rockers are adjustable.
Install the adj push rod, start with the old length, make a make on the valve stem, install the rocker and adjust the preload on the lifter, rotate the engine by hand two revolutions, pull the rocker and check the tip of the valve stem, if the mark is too close to the intake side of the motor the push rod is too short...if the mark is closer to the exhaust side of the motor it's too long, pull the push rod and correct the length, and do the above until the tip of the roller rides on the center of the valve stem.
You torque the bolts holding the rocker mounting shafts down to 30lbs, but the rockers themselves are adjusted like normal rockers, don't torque those down...adjust to 1.5 to two turns past zero lash.
Read the Hughes instructions, it's all there.
Back away from the LS1 video, it's NOT how you install your Hughes Rockers, they are not similar in their installation at all, the LS1 rockers in the video are non adjustable rockers, your Hughes Rockers are adjustable.
Install the adj push rod, start with the old length, make a make on the valve stem, install the rocker and adjust the preload on the lifter, rotate the engine by hand two revolutions, pull the rocker and check the tip of the valve stem, if the mark is too close to the intake side of the motor the push rod is too short...if the mark is closer to the exhaust side of the motor it's too long, pull the push rod and correct the length, and do the above until the tip of the roller rides on the center of the valve stem.
You torque the bolts holding the rocker mounting shafts down to 30lbs, but the rockers themselves are adjusted like normal rockers, don't torque those down...adjust to 1.5 to two turns past zero lash.
Read the Hughes instructions, it's all there.
Last edited by Adobedude; 10-05-2014 at 05:52 PM.
#34
10-05-2014, 05:47 PM
#35
02-01-2016, 01:39 PM
www.stores.hi-potek.com
offers push rods in .025 increments.
Most companies offer in .050 increments.
So when you need .030-.040 preload into the lifter these push rods will get you where you need to be.
I purchased an adjustable push rod from Hughes Engines to figure out my proper rocker arm geometry.
offers push rods in .025 increments.
Most companies offer in .050 increments.
So when you need .030-.040 preload into the lifter these push rods will get you where you need to be.
I purchased an adjustable push rod from Hughes Engines to figure out my proper rocker arm geometry.
