Adjusting my valves?
#1
TECH Fanatic
Thread Starter
iTrader: (2)
Join Date: Apr 2008
Location: Born/Raised North East, MD Lived in VA, NC, MI Back in Yorktown, Va
Posts: 1,170
Likes: 0
Received 1 Like
on
1 Post
Adjusting my valves?
hey guys im trying to do more **** to my own car. me and my dad have always done old school motors SB & BBC. so i understand the basic concept of how to do it. but since our motors are roller motors ( CORRECT? ) do the valves get adjusted to No Lash? or is there a GO/NO GO system used for these? if so what are the peramaters?
If it matters, my motor is a stock head stock intake, LT4 Hotcam, 383. hypereunetic pistons and H-Beams.
Can someone please send some insight my way.
If it matters, my motor is a stock head stock intake, LT4 Hotcam, 383. hypereunetic pistons and H-Beams.
Can someone please send some insight my way.
#2
TECH Regular
iTrader: (8)
Join Date: Mar 2009
Location: Maryland
Posts: 475
Likes: 0
Received 0 Likes
on
0 Posts
What rocker arms do you have?
If you already know how to adjust flat tappet hydraulic cam motors you should be fine, its basically the same thing as far as which valve to adjust when, you typically do zero lash then another 1/4 to 1/2 turn. Zero lash is when you feel resistance on the pushrod while spinning it as you tighten the rocker down.
shoe box has a good write up its about 1/2 way down this page.
http://shbox.com/1/4th_gen_tech2.html#adjust_valves
If you already know how to adjust flat tappet hydraulic cam motors you should be fine, its basically the same thing as far as which valve to adjust when, you typically do zero lash then another 1/4 to 1/2 turn. Zero lash is when you feel resistance on the pushrod while spinning it as you tighten the rocker down.
shoe box has a good write up its about 1/2 way down this page.
http://shbox.com/1/4th_gen_tech2.html#adjust_valves
#3
TECH Senior Member
iTrader: (3)
Join Date: Oct 2006
Location: Decatur, TN (N-W of Athens)
Posts: 7,564
Likes: 0
Received 3 Likes
on
3 Posts
What rocker arms do you have?
If you already know how to adjust flat tappet hydraulic cam motors you should be fine, its basically the same thing as far as which valve to adjust when, you typically do zero lash then another 1/4 to 1/2 turn. Zero lash is when you feel resistance on the pushrod while spinning it as you tighten the rocker down.
shoe box has a good write up its about 1/2 way down this page.
http://shbox.com/1/4th_gen_tech2.html#adjust_valves
If you already know how to adjust flat tappet hydraulic cam motors you should be fine, its basically the same thing as far as which valve to adjust when, you typically do zero lash then another 1/4 to 1/2 turn. Zero lash is when you feel resistance on the pushrod while spinning it as you tighten the rocker down.
shoe box has a good write up its about 1/2 way down this page.
http://shbox.com/1/4th_gen_tech2.html#adjust_valves
RRs change things though, if you have the whole Hotcam package (springs, cam and roller rockers). Not done them, not looked into it either, so I can't offer any advice :\
#4
Village Troll
iTrader: (2)
Here's one method:
http://www.youtube.com/watch?v=VPOaAsuzhsE
You can find a few more on shoebox's page:
http://shbox.com/1/4th_gen_tech2.html#adjust_valves
I've always been a fan of the TDC/adjust this and that valve/turn 360* and adjust the rest. Has always worked well for hyd. roller setups.
http://www.youtube.com/watch?v=VPOaAsuzhsE
You can find a few more on shoebox's page:
http://shbox.com/1/4th_gen_tech2.html#adjust_valves
I've always been a fan of the TDC/adjust this and that valve/turn 360* and adjust the rest. Has always worked well for hyd. roller setups.
#5
TECH Resident
Join Date: Feb 2005
Location: Valdosta Ga.
Posts: 900
Likes: 0
Received 0 Likes
on
0 Posts
I've always adjusted mine with the engine off. Never had a problem. After you do it a few times its easy. I really dont see how so many people have so much trouble with it.
#7
TECH Regular
iTrader: (8)
Join Date: Mar 2009
Location: Maryland
Posts: 475
Likes: 0
Received 0 Likes
on
0 Posts
After you adjust them a few times you get a "feeling" for it and don't need to do either of the methods (I've had some practice lol) and you get very fast at it. Its also a lot quicker if you are just adjusting them compared to installing them b/c you will knowtice the intake/exhaust valve movement.
The LT4 actually had a torque spec, but most people adjusted them in a conventional method.
The LT4 actually had a torque spec, but most people adjusted them in a conventional method.
Trending Topics
#9
Launching!
Join Date: May 2007
Location: knoxville tn
Posts: 216
Likes: 0
Received 0 Likes
on
0 Posts
i adjust them till they stop clicking. then tighten the polly lock up. that usually adds 1/4 to 1/2 turn. its just like the old school motors. lsx's are the only ones who are different
#10
TECH Regular
iTrader: (8)
Join Date: Mar 2009
Location: Maryland
Posts: 475
Likes: 0
Received 0 Likes
on
0 Posts
No, the LT4's actually had a torque rating from the factory to adjust their RR's. I didn't believe it at first, because I find a set torque rating would be difficult to adjust the rockers, but that is what they call for.
#13
TECH Regular
iTrader: (8)
Join Date: Mar 2009
Location: Maryland
Posts: 475
Likes: 0
Received 0 Likes
on
0 Posts
http://www.texasfbody.org/TorqueSpecs/
Down the page under LT1/LT4, I didn't believe it at first either and still wouldn't adjust mine that way if I owned one.
Down the page under LT1/LT4, I didn't believe it at first either and still wouldn't adjust mine that way if I owned one.
#14
Launching!
Join Date: May 2007
Location: knoxville tn
Posts: 216
Likes: 0
Received 0 Likes
on
0 Posts
i thought thats what i said i did. i run it loosen them up and tighten till it stops making noise. then tighten the set screw. then tighten the lock down. theat helps keeping them from coming loose. and by the time you get them tight its about 1/4 of a turn. their hydraulic so its not real critical. i take more pricision in doing my solid roller race car motor.
#15
Village Troll
iTrader: (2)
http://www.texasfbody.org/TorqueSpecs/
Down the page under LT1/LT4, I didn't believe it at first either and still wouldn't adjust mine that way if I owned one.
Down the page under LT1/LT4, I didn't believe it at first either and still wouldn't adjust mine that way if I owned one.
Last edited by SS RRR; 04-03-2009 at 02:54 AM.
#16
TECH Fanatic
Thread Starter
iTrader: (2)
Join Date: Apr 2008
Location: Born/Raised North East, MD Lived in VA, NC, MI Back in Yorktown, Va
Posts: 1,170
Likes: 0
Received 1 Like
on
1 Post
alright wow thanks for all the help guys. BTW i dont have RRs just plain old stock rockers stock valves stock pushrods and all for now atleast
so i can do it like the old school carbed SBC right? have oil clips on it, run it back the nut off till it clicks, take it back down untill it stops clicking, and then no more then 1/4-1/2 a turn after that and set everything? am i correct in thats what everyone is saying? i have read shoeboxes page yet. or any of the links yet. but just for a quick check so i understand we all are on the same page.
so i can do it like the old school carbed SBC right? have oil clips on it, run it back the nut off till it clicks, take it back down untill it stops clicking, and then no more then 1/4-1/2 a turn after that and set everything? am i correct in thats what everyone is saying? i have read shoeboxes page yet. or any of the links yet. but just for a quick check so i understand we all are on the same page.
#17
Village Troll
iTrader: (2)
Yes. LT1's share the same firing order as any SBC therefore adjusting valves will be exactly the same, but as you stated, using the running method especially with stock rockers would probably be easiest.
Good luck and don't burn yourself.
Good luck and don't burn yourself.