Checking PTV confusion
Checking PTV confusion I have a feeling I will hear crickets on this one....
Ok, I read a thread about checking PTV clearence with a sold lifter.
My question....How do you use your stock pushrod? If my pushrods are measured with zero lash + .05-.08 pre-load, with a solid lifter, my valves will be pushed open that much reducing the measured clearence.
Does that make sense? Seems to do this right, you need different (Shorter)pushrods?
Ok, I read a thread about checking PTV clearence with a sold lifter.
My question....How do you use your stock pushrod? If my pushrods are measured with zero lash + .05-.08 pre-load, with a solid lifter, my valves will be pushed open that much reducing the measured clearence.
Does that make sense? Seems to do this right, you need different (Shorter)pushrods?
TECH Addict
Joined: Sep 2009
Posts: 2,481
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From: PA/MD
You are looking for a MINIMUM of .080" on intake, and .100" exhaust, so if you get your measurement in the clay and add your preload of .050-.080" to it that should give you your ptv.....to be safe I'd only add the minimum of .050" to your clay measurement.
Any tips on where to buy a single or pair of solid lifters?? (Cheap)
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TECH Senior Member
Joined: Mar 2004
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From: BFE
I have a feeling I will hear crickets on this one....
Ok, I read a thread about checking PTV clearence with a sold lifter.
My question....How do you use your stock pushrod? If my pushrods are measured with zero lash + .05-.08 pre-load, with a solid lifter, my valves will be pushed open that much reducing the measured clearence.
Does that make sense? Seems to do this right, you need different (Shorter)pushrods?
Ok, I read a thread about checking PTV clearence with a sold lifter.
My question....How do you use your stock pushrod? If my pushrods are measured with zero lash + .05-.08 pre-load, with a solid lifter, my valves will be pushed open that much reducing the measured clearence.
Does that make sense? Seems to do this right, you need different (Shorter)pushrods?
bingo that is your p-rod length desired.
Sometimes I use 2 size p-rods if the cam is dual lobed. So intake will be different than exhaust.
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Interesting! On my last build I noticed that the intake looked like it wanted a .025 longer PR but I thought I was crazy and used the same on both. I will be making some changes to that motor in the next few weeks maybe I will order the longer ones for the intake.
