Where to start valve lash
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
The only way IMHO is to start at #1 TDC.
Lash that cylinder.
Mark the balancer at 90 degree intervals......the next 90 will be TDC#8...then TDC#4 then go through the rest of the firing order.
All of the other method are either too tricky or not good enough.
Go to the track and see how they do it...
The valve HAS to be closed at TDC.....this is the definite basecircle of the cam.
Others have debated that the lash goes wider as it comes on to the ramp.....that is just not so....
I have ran many cams...roller or not...through a Cam Doctor for specs. The basecircle is the basecircle.
But lash how you see fit.....we are all men here
Peace,
Jebby
Jebby
Lash that cylinder.
Mark the balancer at 90 degree intervals......the next 90 will be TDC#8...then TDC#4 then go through the rest of the firing order.
All of the other method are either too tricky or not good enough.
Go to the track and see how they do it...
The valve HAS to be closed at TDC.....this is the definite basecircle of the cam.
Others have debated that the lash goes wider as it comes on to the ramp.....that is just not so....
I have ran many cams...roller or not...through a Cam Doctor for specs. The basecircle is the basecircle.
But lash how you see fit.....we are all men here
Peace,
Jebby
Jebby
Burning Brakes
Joined: Sep 2012
Posts: 818
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From: coon rapids mn
if you are on #1 cylinder ,#8 and #6 push rods will be up ,and #5 will have a push rod sitting low .if you are on cylinder #6 ,#1 and #5 will have both push rods up ,and #8 will have a push rod sitting low .if you are on #1 cylinder ,and your distributor rotor is correct ,you can mark the other cylinder positions on the base of the distributor .
Thread Starter
Advanced
Joined: Nov 2013
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And this is where I start getting confused. Lol.
Ok so if right now the marks are dot to dot where am I at? Btw like I mentioned the lifters on #1 are both down and the #1 cylinder is tdc. Would pics help?
I thought I understood it from billa but other input (which I appreciate) are kind of contradictory
Ok so if right now the marks are dot to dot where am I at? Btw like I mentioned the lifters on #1 are both down and the #1 cylinder is tdc. Would pics help?
I thought I understood it from billa but other input (which I appreciate) are kind of contradictory
Le Mans Master
Joined: Oct 2002
Posts: 7,098
Likes: 378
From: Las Vegas - Just stop perpetuating myths please.
And this is where I start getting confused. Lol.
Ok so if right now the marks are dot to dot where am I at? Btw like I mentioned the lifters on #1 are both down and the #1 cylinder is tdc. Would pics help?
I thought I understood it from billa but other input (which I appreciate) are kind of contradictory
Ok so if right now the marks are dot to dot where am I at? Btw like I mentioned the lifters on #1 are both down and the #1 cylinder is tdc. Would pics help?
I thought I understood it from billa but other input (which I appreciate) are kind of contradictory
If timing marks are dot to dot even though both #1 and #6 are at TDC, #1 is in overlap - meaning lifters are not on the base circle. While #6 is ready for compustion and both valves should be closed - those lifters are on base circle.
U dont seem to be able to recognize this for some reason. Maybe u put a Ford engine in your corvette? Did u buy the car with or without a motor? Have u ever driven this car?
cardo0
Last edited by vettebuyer6369; Dec 6, 2013 at 04:11 PM. Reason: unnecessary comment removed
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Dot to dot....TDC on #6
Both dots up TDC #1.
Cam rotates 1/2 crank speed and there are a square
number of cylinders.
Do #1 TDC first.
Rotate the crank every 90 degrees to get the next cylinder
1-8-4-3-6-5-7-2
In this order each successive cylinder will be at TDC.
It is easy and effective as you do both valves on that cylinder.
Lot less chance to miss one.
Oh...FYI....ever multi cylinder on the planet can be done the TDC method.
Anyone else who is doing it another way is thinking about it too hard.
It is even easier to do with the intake off...you can see the lifters.
Try it....if you do the procedure correctly....it is forever.
Jebby
Both dots up TDC #1.
Cam rotates 1/2 crank speed and there are a square
number of cylinders.
Do #1 TDC first.
Rotate the crank every 90 degrees to get the next cylinder
1-8-4-3-6-5-7-2
In this order each successive cylinder will be at TDC.
It is easy and effective as you do both valves on that cylinder.
Lot less chance to miss one.
Oh...FYI....ever multi cylinder on the planet can be done the TDC method.
Anyone else who is doing it another way is thinking about it too hard.
It is even easier to do with the intake off...you can see the lifters.
Try it....if you do the procedure correctly....it is forever.
Jebby
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Burning Brakes
Joined: Apr 2007
Posts: 1,039
Likes: 62
From: Kona Hawaii
Read this link I posted.http://www.centuryperformance.com/va...procedure.html
It will clear things up for you.It's a simple procedure not difficult at all. Crank dot at 12 o'clock cam dot at 6 will be cyl #6 firing position. Crank dot at 12 cam dot at 12 will be cyl #1 firing position,you will set your dist to fire # 1 position. When you spin the crank you'll see how the intake valve will close just before that cylinder is set to fire.This will follow the engines firing order, 1 8 4 3 6 5 7 2..Actually spark will occur before TDC,depends where you set your timing when tuning the engine..Hope this clears it up for u...
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It will clear things up for you.It's a simple procedure not difficult at all. Crank dot at 12 o'clock cam dot at 6 will be cyl #6 firing position. Crank dot at 12 cam dot at 12 will be cyl #1 firing position,you will set your dist to fire # 1 position. When you spin the crank you'll see how the intake valve will close just before that cylinder is set to fire.This will follow the engines firing order, 1 8 4 3 6 5 7 2..Actually spark will occur before TDC,depends where you set your timing when tuning the engine..Hope this clears it up for u...
[IMG]
[/IMG]
Last edited by iokepakai; Dec 6, 2013 at 03:59 AM.
Drifting
Joined: Jan 2002
Posts: 1,645
Likes: 11
From: Schaumburg IL
The only addition is yes the EOIC is a way to go where you are not worried about TDC, seeing the wrong mark on the balancer or risking which valve is what cyl and intake or exhaust are easy to find which one feeds or is fed by intake or exh manifold. This is helps someone that has not done this a lot of times.
I have used all methods successfully, but found taking an old valve cover and cutting a window out of the top and doing the valves with the engine running gets them right on. You can observe the valve action (hook up a timing light to a cyl and watch), see problems and it is not messy. If unfamiliar go to You Tube and search for adjusting valves and there are numberous videos on this task. Oh, I know the negatives of "you did not hear the clacking right or you turned too far" but it works fine for me.
I have used all methods successfully, but found taking an old valve cover and cutting a window out of the top and doing the valves with the engine running gets them right on. You can observe the valve action (hook up a timing light to a cyl and watch), see problems and it is not messy. If unfamiliar go to You Tube and search for adjusting valves and there are numberous videos on this task. Oh, I know the negatives of "you did not hear the clacking right or you turned too far" but it works fine for me.
Instructor
Joined: Apr 2007
Posts: 142
Likes: 6
From: Indianapolis, Indiana
[U]I have used all methods successfully, but found taking an old valve cover and cutting a window out of the top and doing the valves with the engine running gets them right on. You can observe the valve action (hook up a timing light to a cyl and watch), see problems and it is not messy. If unfamiliar go to You Tube and search for adjusting valves and there are numberous videos on this task. Oh, I know the negatives of "you did not hear the clacking right or you turned too far" but it works fine for me.
Last edited by 71454Chevelle; Dec 6, 2013 at 07:50 AM.
Administrator
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From: About 1100 miles from where I call home.
If we want the information being provided in this thread to continue, please cease the conflict and namecalling.
Any of each from this point forward will result in sanctions and a closed thread. thanks.
Any of each from this point forward will result in sanctions and a closed thread. thanks.
Le Mans Master
Joined: Mar 2008
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From: Oxford MA-----You just lost the game!!!!
Scott
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
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From: New Braunfels Texas
If you install the cam dot-to-dot, wouldn't it be better to start there? What I mean is, do the 3, 4, 6, 8 intakes and the 2, 5, 6, 7, exhausts, then spin the engine one revolution, so #1 piston is at TDC compression stroke, (dots at 12 o'clock and 12 o'clockand) and do the 1, 2, 5, 7 intakes, and the 1, 3, 4, 8 exhausts? It seems like you'd have to spin the engine one less time.
Scott
Scott
You are not going to hurt it turning it by hand.
If your balancer is not on.....use a long ratchet to figure your 90 degrees.....you have to be close but there are a few degrees to play with either way if you are not on the money.
Jebby
Team Owner
Joined: May 2001
Posts: 87,381
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From: Western NY
It's indeed "foolproof", but my preference, if possible, is to do things as easily as possible. 40 years of working on cars has taught me this. Therefore, I prefer to get the engine at TDC #1, and do half the valves, then turn it over ONE time, and do the remainder...
Le Mans Master
Joined: Jun 2004
Posts: 6,231
Likes: 65
From: Seattle WA
St. Jude Donor '14
I've personally found the companion cylinder method to be very reliable, consistent and easy. I do recognize that it can be inaccurate for wild cams, but I rarely if ever touch anything over about 1.2 HP/CID. That may be why there's so much passion around the EOIC method, since it *always* works.
No wrong answers; my only "no" would be doing it while the engine's running because I've seen that consistently lead to too much preload...and it's a PITA
Regardless, I hope the OP has had enough guidance on this and everything's sorted out
Thread Starter
Advanced
Joined: Nov 2013
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Haven't had a chance to get it done yet but there is indeed enough guidance here for me to accomplish it. As to setting it with the engine running, a friend of mine does it that way. I wouldn't want to deal with the mess on freshly painted parts. Lol.
Dr. Detroit
Joined: Mar 2012
Posts: 10,097
Likes: 4,027
From: New Braunfels Texas
Jebby