What affects pushrod length?
If you are assembling a new performance engine equipped with non-standard parts like 0.100-inch longer intake valves or lash caps, these components directly affect the pushrod length. Other variables that affect pushrod length would be changing from a flat tappet to mechanical or hydraulic roller lifters.
Can you change the length of a stock pushrod?
If your motor is all stock, the answer is no. Your stock pushrods are designed to be within the acceptable length range even in the worst case tolerance stack-up situation. Changing the height of the cylinder head changes height of the rocker arm relative to the cam, and therefore it needs to be factored into the needed pushrod length.
When do you need an adjustable pushrod for a lifter?
Now sure, there are situations where adjustable pushrods are required. When you need to set your lash or your lifter plunger preload precisely, as is done for solid lifters or travel limited hydraulic lifters, an adjustable pushrod is the only reasonable way to accomplish it.
Where are the pushrods on a Harley twin?
Tighten down the rocker box and then adjust the pushrods by finger only until all of the slack is taken up. Make sure of course that you do this with the engine properly positioned at or near TDC on compression (not overlap TDC!), and that the upper end of each pushrod is sitting in the pocket on the rocker arm.
How does height of cylinder head affect pushrod length?
Changing the height of the cylinder head changes height of the rocker arm relative to the cam, and therefore it needs to be factored into the needed pushrod length. In particular, it’s very common to “deck” a head to raise compression in a high performance motor.
If your motor is all stock, the answer is no. Your stock pushrods are designed to be within the acceptable length range even in the worst case tolerance stack-up situation. Changing the height of the cylinder head changes height of the rocker arm relative to the cam, and therefore it needs to be factored into the needed pushrod length.
Now sure, there are situations where adjustable pushrods are required. When you need to set your lash or your lifter plunger preload precisely, as is done for solid lifters or travel limited hydraulic lifters, an adjustable pushrod is the only reasonable way to accomplish it.
Tighten down the rocker box and then adjust the pushrods by finger only until all of the slack is taken up. Make sure of course that you do this with the engine properly positioned at or near TDC on compression (not overlap TDC!), and that the upper end of each pushrod is sitting in the pocket on the rocker arm.
What causes push rods to bend after use?
Lifters collapsed within a couple hundred miles of use. Causing push rods to bend and having to do everything all over again. Might be cheap but that’s what you’re going to get. Pages with related products. See and discover other items: Best Rated in Automotive Replacement Engine Push Rods