PTV check question
PTV check question when checking PTV what length pushrods should you use with the solid test lifters and check springs. Do you use an adjustable pushrod set to zero lash? In my case with solid lifters at zero lash it is 7.350". In my completed engine I'll be running 7.425" which will give me .075 preload. If i'm checking PTV with 7.350" pushrods but actually using 7.425" pushrods in the completed engine wouldn't the PTV closer that what i checked it at with the 7.350"? It seems like if the engine is running at high rpm and the lifter is pumped up with the 7.425" pushrods, the ptv could get really close. I'm a little confused on this part could someone explain this?
when checking PTV what length pushrods should you use with the solid test lifters and check springs. Do you use an adjustable pushrod set to zero lash? In my case with solid lifters at zero lash it is 7.350". In my completed engine I'll be running 7.425" which will give me .075 preload. If i'm checking PTV with 7.350" pushrods but actually using 7.425" pushrods in the completed engine wouldn't the PTV closer that what i checked it at with the 7.350"? It seems like if the engine is running at high rpm and the lifter is pumped up with the 7.425" pushrods, the ptv could get really close. I'm a little confused on this part could someone explain this?
I would use solid lifters to do this check. Take a couple old ones apart, remove the spring and stack the appropriate amount of washers in there and reassemble. Now, use your push rod length checker and adjust it out to zero lash with your rockers torqued down. You can now properly check P-V clearance.
I assume you are checking with clay. Use the solid lifters and a pushrod that provides zero lash when the lifter is on the base circle. You can also double check with a dial indicator. One thing you won't measure is the system flex you will get when the motor is running, which will increase PTV.
When you install the longer length with preload, the lifter plunger will set so that PTV will be the same.
When you install the longer length with preload, the lifter plunger will set so that PTV will be the same.
I've made two of my old lifters solid already. I used the clay method and was going to check with a dial indicator just to try the two different checks. I only asked this question because I was curious if the pushrod length difference would have any effect, and I see now the answer is no
Trending Topics
LS1 Tech Stories
The Best V8 Stories One Small Block at Time
6 Common C5 Corvette Failures and What's Involved In Repairing Them
Pouria Savadkouei
Retro Modern Bandit Pontiac Trans AM Comes With Burt Reynolds' Autograph
Verdad Gallardo
Top 10 Greatest Cadillac V Series Performance Models Ever, Ranked
Pouria Savadkouei
Top 10 Most Powerful Chevy Trucks Ever Made!
Hennessey's New Supercharged Silverado ZR2 Has 700 HP
Verdad Gallardo
Coachbuilt N2A Anteros Is an LS2-Powered C6 Corvette In Italian Clothes
Verdad Gallardo
Awesome K5 Blazer Restomod Comes With C7 Corvette Power
Verdad Gallardo
10 Camaros You Should Never Buy
10 LS Engine Myths That Refuse to Die
Verdad Gallardo It should be, but again it will be a little conservative because once you put in the real springs and the pushrod and rocker flex the PTV will actually increase on the running motor. Mine is a little under the accepted minumums on the intake side, but since the valve is chasing the piston I was less concerned then I would be if the exhaust were under since then you are depending on the valve spring to get the valve shut prior to the piston reaching the top.
