Measuring cam lift without removing cam - Camaro5 Chevy Camaro Forum / Camaro ZL1, SS and V6 Forums

jbassking · 07-02-2018, 08:38 PM

I want to double check the lift of my cam but don't want to take it out. I figured if I remove a valve cover and measure the height of the spring when the valve is closed and subtract the height when it's fully open, I should get the overall lift but the numbers just aren't even close.

Am I missing something here?

go_go_gadget88 · 07-02-2018, 08:44 PM

I did the same thing. When engine is off the lifter isn't pumping up and bottoms out. So you have to add in the lifter travel x the rocker ratio and add that to your valve lift. If I understood correctly.

jbassking · 07-02-2018, 08:49 PM

How would I know the lifter travel?

jbassking · 07-02-2018, 09:06 PM

I think the standard is .050 but I could be wrong.

go_go_gadget88 · 07-02-2018, 09:14 PM

I wanna say total lifter plunger travel to bottom is .200 for a stock ls3 lifter

I could sure be wrong so do some looking. Its more than .050 for sure. I have more preload than that so I'd be bottomed out lol.

07-02-2018, 08:38 PM	#1
jbassking Drives: 2012 SS Join Date: Aug 2017 Location: Lake Worth, FL Posts: 99	Measuring cam lift without removing cam I want to double check the lift of my cam but don't want to take it out. I figured if I remove a valve cover and measure the height of the spring when the valve is closed and subtract the height when it's fully open, I should get the overall lift but the numbers just aren't even close. Am I missing something here?

07-02-2018, 08:44 PM	#2
go_go_gadget88 Drives: 2010 Camaro 2SS/RS ABM 6M Join Date: Jul 2017 Location: Kansas Posts: 617	I did the same thing. When engine is off the lifter isn't pumping up and bottoms out. So you have to add in the lifter travel x the rocker ratio and add that to your valve lift. If I understood correctly. __________________ 2010 ABM 2SS/RS LS3 6 Speed -- Rotofab CAI \| Speed Engineering 1 7/8" Longtubes w/ cat Delete \| Magnaflow competition catback \| TSP 231/246 cam\| TSP/PAC .660" Spring Kit \| TSP CNC Ported Heads \| Bo White PTB \| GPI Ported/RM Intake \| 3.91's \| BC Catch Can \| MGW Shifter \| BMR 1" Drop Springs \| BMR Trailing arms/Toe Rods/Rear UCA Bushings \| Pegasus Subframe Mounts

07-02-2018, 09:14 PM	#5
go_go_gadget88 Drives: 2010 Camaro 2SS/RS ABM 6M Join Date: Jul 2017 Location: Kansas Posts: 617	I wanna say total lifter plunger travel to bottom is .200 for a stock ls3 lifter I could sure be wrong so do some looking. Its more than .050 for sure. I have more preload than that so I'd be bottomed out lol. __________________ 2010 ABM 2SS/RS LS3 6 Speed -- Rotofab CAI \| Speed Engineering 1 7/8" Longtubes w/ cat Delete \| Magnaflow competition catback \| TSP 231/246 cam\| TSP/PAC .660" Spring Kit \| TSP CNC Ported Heads \| Bo White PTB \| GPI Ported/RM Intake \| 3.91's \| BC Catch Can \| MGW Shifter \| BMR 1" Drop Springs \| BMR Trailing arms/Toe Rods/Rear UCA Bushings \| Pegasus Subframe Mounts

07-02-2018, 08:49 PM	#3
jbassking Drives: 2012 SS Join Date: Aug 2017 Location: Lake Worth, FL Posts: 99	How would I know the lifter travel?

07-02-2018, 09:06 PM	#4
jbassking Drives: 2012 SS Join Date: Aug 2017 Location: Lake Worth, FL Posts: 99	I think the standard is .050 but I could be wrong.