(inches of lash)/(turn of nut)
#1
(inches of lash)/(turn of nut)
For my new lifters CC gave me the lash in inches, which makes sense for them. However, what works for me is now much of a turn. How many inches is a turn of the rocker arm nut? Factory stock studs. Thanks
#2
Re: (inches of lash)/(turn of nut)
Originally posted by natZ
For my new lifters CC gave me the lash in inches, which makes sense for them. However, what works for me is now much of a turn. How many inches is a turn of the rocker arm nut? Factory stock studs. Thanks
For my new lifters CC gave me the lash in inches, which makes sense for them. However, what works for me is now much of a turn. How many inches is a turn of the rocker arm nut? Factory stock studs. Thanks
Is that a solid roller? If it's hydraulic roller set it running and hot, they might have given you prelim numbers.
#4
The number they gave is a range for the lash 0.02-0.06" This is just by memory so it could be off by an order of magnitude. I know I've seen people state the (inches of lash)/(turn of rocker nut) for factory stock heads. When I put them in I went 1/4 turn past lash while hot and running. I haven't had any immediate problems, I just wanted to follow up and make sure that a 1/4 turn was within the range CC gave. Thanks
#6
Originally posted by BUBBA
Hydro cam, 1/2 past 0. JMHO
Hydro cam, 1/2 past 0. JMHO
#8
0 lash is when you just feel a slight drag when you twirl the push rod between your thumb and index finger with the valve closed.
ONE way of adjusting preload.
Coil wire off.
Bump engine til Ex just starts to open. Adjust Int.
Bump again til INT opens fully and is on way to roughly half closed. Adjust EX.
Start with either bank and work your way around.
You might want to warm engine up. Start with one bank. When complete. Warm engine up again and remove valve cover on remaining bank and complete that one. (If you remove both v covers at the same time, the second bank will have cooled down before you get to it).
You probably don't have to adjust them hot, but it would'nt hurt to have all the lifters nicely primed. JMHO.
ONE way of adjusting preload.
Coil wire off.
Bump engine til Ex just starts to open. Adjust Int.
Bump again til INT opens fully and is on way to roughly half closed. Adjust EX.
Start with either bank and work your way around.
You might want to warm engine up. Start with one bank. When complete. Warm engine up again and remove valve cover on remaining bank and complete that one. (If you remove both v covers at the same time, the second bank will have cooled down before you get to it).
You probably don't have to adjust them hot, but it would'nt hurt to have all the lifters nicely primed. JMHO.
#9
Originally posted by BUBBA
0 lash is when you just feel a slight drag when you twirl the push rod between your thumb and index finger with the valve closed.
ONE way of adjusting preload.
Coil wire off.
Bump engine til Ex just starts to open. Adjust Int.
Bump again til INT opens fully and is on way to roughly half closed. Adjust EX.
Start with either bank and work your way around.
You might want to warm engine up. Start with one bank. When complete. Warm engine up again and remove valve cover on remaining bank and complete that one. (If you remove both v covers at the same time, the second bank will have cooled down before you get to it).
That's some good info to get me started. Hopefully I'll have to put it to use soon.
You probably don't have to adjust them hot, but it would'nt hurt to have all the lifters nicely primed. JMHO.
0 lash is when you just feel a slight drag when you twirl the push rod between your thumb and index finger with the valve closed.
ONE way of adjusting preload.
Coil wire off.
Bump engine til Ex just starts to open. Adjust Int.
Bump again til INT opens fully and is on way to roughly half closed. Adjust EX.
Start with either bank and work your way around.
You might want to warm engine up. Start with one bank. When complete. Warm engine up again and remove valve cover on remaining bank and complete that one. (If you remove both v covers at the same time, the second bank will have cooled down before you get to it).
That's some good info to get me started. Hopefully I'll have to put it to use soon.
You probably don't have to adjust them hot, but it would'nt hurt to have all the lifters nicely primed. JMHO.
#10
Re: (inches of lash)/(turn of nut)
Originally posted by natZ
For my new lifters CC gave me the lash in inches, which makes sense for them. However, what works for me is now much of a turn. How many inches is a turn of the rocker arm nut? Factory stock studs. Thanks
For my new lifters CC gave me the lash in inches, which makes sense for them. However, what works for me is now much of a turn. How many inches is a turn of the rocker arm nut? Factory stock studs. Thanks
1 flat on the nut is 1/6 *.050 or .0083. Figure .008/flat.
If you are adjusting hydraulics, BUBBA's method for finding zero lash is good, and you are then compressing the lifter.
#11
So if Comp Cams says that they should be preloaded to 0.006" while the engine is hot. That number came with the lifters and is posted on their website. That would be (0.006")/(0.05"/turn), or about 1/8 of a turn past lash. I know I've heard that the "R" lifters are supposed to be adjusted to about an 1/8 of turn past lash but I didn't think that the Pro Magnum were also. I'm going to adjust my valves to this, so somebody please let me know if I'm doing something wrong. It worries me a little that the range of adjustment is actually 0.002"-0.006", where the loose end works out to 1/25 of a turn, can that be right? It's got to be pretty tough to determine zero lash within 1/25 of a turn in order to be able to make that adjustment properly.
Thread
Thread Starter
Forum
Replies
Last Post
NewsBot
2010 - 2015 Camaro News, Sightings, Pictures, and Multimedia
2
04-11-2015 11:44 AM
formula79
Automotive News / Industry / Future Vehicle Discussion
26
08-05-2002 12:21 PM