Pushrod Length With Johnson 2116
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Joined: Mar 2014
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Pushrod Length With Johnson 2116
Curious to see what pushrod lengths are being ran with Johnson 2116LSR lifters and factory LS7 compression. I had measured to 7.94" and I have concern they are too long after my less than stellar dyno session and the car not starting the greatest after it's been running (lifters pumping up keeping valves open?)
thanks!
thanks!
Safety Car
Joined: May 2016
Posts: 4,654
Likes: 1,837
From: Erlanger, Kentucky
Curious to see what pushrod lengths are being ran with Johnson 2116LSR lifters and factory LS7 compression. I had measured to 7.94" and I have concern they are too long after my less than stellar dyno session and the car not starting the greatest after it's been running (lifters pumping up keeping valves open?)
thanks!
thanks!
I am sure that Johnson designed their lifters so that it is a simple swap if you are replacing stock lifters.
Assuming your only change was going to the 2116LSR lifters, your pushrod length should be the same as before.
Drifting
Joined: Dec 2004
Posts: 1,295
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From: Oshawa Ontario
I spent what felt like forever, carefully measuring the pushrod length I would need after my Mamo head / cam swap project (Mamo LS7 build), running 2116LSR lifters, and when all was said and done, I ended up putting the factory LS7 PR's back in, despite having bought & paid for a set of (shorter by 0.020") Manton PR's. I did initially run them, but when torquing them down, only got maybe ~1/4 turn past the "zero lash" point on every single one. With the stock PR's, I got ~1/2 turn, which seems to be what everybody recommends as "text-book".
Trying to find the "consequences" of PR's that are too short is a lot harder than finding the (more obvious) consequence of too long. But valve float I think becomes a concern, and loosening tolerances as the engine heats up.
FWIW, my factory PR's measured around 7.825". Not sure what the tolerance is, but that's what I came up with. The rods I ordered were 7.805", which I became concerned, were putting me too far below the 0.035" +/- 0.010" tolerance for the Johnson lifters.
Trying to find the "consequences" of PR's that are too short is a lot harder than finding the (more obvious) consequence of too long. But valve float I think becomes a concern, and loosening tolerances as the engine heats up.
FWIW, my factory PR's measured around 7.825". Not sure what the tolerance is, but that's what I came up with. The rods I ordered were 7.805", which I became concerned, were putting me too far below the 0.035" +/- 0.010" tolerance for the Johnson lifters.
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Joined: Mar 2014
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I have Johnson 2110R's in my Grand Sport. I think the 2116LSR's are the link bar version of those. When I measured for pushrod length going from a stock LS7 lifter to the Johnson's, it was the same pushrod length needed.
I am sure that Johnson designed their lifters so that it is a simple swap if you are replacing stock lifters.
Assuming your only change was going to the 2116LSR lifters, your pushrod length should be the same as before.
I am sure that Johnson designed their lifters so that it is a simple swap if you are replacing stock lifters.
Assuming your only change was going to the 2116LSR lifters, your pushrod length should be the same as before.
Melting Slicks
Joined: Nov 2011
Posts: 3,174
Likes: 259
From: Virginia
I have Johnson 2110R's in my Grand Sport. I think the 2116LSR's are the link bar version of those. When I measured for pushrod length going from a stock LS7 lifter to the Johnson's, it was the same pushrod length needed.
I am sure that Johnson designed their lifters so that it is a simple swap if you are replacing stock lifters.
Assuming your only change was going to the 2116LSR lifters, your pushrod length should be the same as before.
I am sure that Johnson designed their lifters so that it is a simple swap if you are replacing stock lifters.
Assuming your only change was going to the 2116LSR lifters, your pushrod length should be the same as before.
rather than asking for what pushrod length to use it’s more important to know what preload to use and then measure, which will give you the correct pushrod length.
Instructor
Joined: Jan 2006
Posts: 223
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From: Rocky Mountains USA
2116LSR here
OEM LS7 pushrods are nominal 7.80 but end to end measure 7.825
I measured every lobe and got a range of 0.012" with the longest being 7.889 Shortest I cant remember, but I ended up with 7.850 LT1 OEM length rods. The engine runs fine. But I have a couple of cylinders a little noisy with a tick. These ones really should have 7.865 nominal I think, or an extra 0.015" to give closer to the 0.045 suggested by some builders.
This is because the block etc will stretch 0.015 or so when hot, so my preload will drop to only 0.010 or so.
So long story short, Im going to order a few slightly longer ones to put on the cylinders that tick. Im hoping this cures the ticks.
So yeah, for me the best length without cam change was to go from OEM 7.80 to 7.85 which is OEM C7 LT1 length. That being said I did swap heads at the same time, so YMMV.
OEM LS7 pushrods are nominal 7.80 but end to end measure 7.825
I measured every lobe and got a range of 0.012" with the longest being 7.889 Shortest I cant remember, but I ended up with 7.850 LT1 OEM length rods. The engine runs fine. But I have a couple of cylinders a little noisy with a tick. These ones really should have 7.865 nominal I think, or an extra 0.015" to give closer to the 0.045 suggested by some builders.
This is because the block etc will stretch 0.015 or so when hot, so my preload will drop to only 0.010 or so.
So long story short, Im going to order a few slightly longer ones to put on the cylinders that tick. Im hoping this cures the ticks.
So yeah, for me the best length without cam change was to go from OEM 7.80 to 7.85 which is OEM C7 LT1 length. That being said I did swap heads at the same time, so YMMV.
