Major problems with 1.85 ratio rock and spring installation
Thread Starter
11 Second Club
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From: North East, MD
I am hoping it is just a bad plug as I just bought some to change them (fingers are crossed it isn't a valve). I must have one weak lifter as it didn't lash good at 3/4 but took one full turn to quite down. Is this common?
I am in the middle of my H/C/Clutch/Brake/Suspension install and have Jesel 1.85 shaft mounted rockers to install. This is my first LS1 H/C install so cannot give expert advice but I would replace all your plugs and see if you still have a misfire. Its simple and cheap to eliminate one possibility.
.0833 at the middle of the rocker on the polylock pushes the pushrod cup down about 2.85/1.85 or 1.54 ratio in that direction as it's not 1 to 1 unless that was an adjuster right over the pushrod. This equals about .128 preload or almost bottomed out depending on the lifter.
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
If you have a 1 to 1 rocker it means you have 1 unit of length from the pushrod cup to the trunion and you have 1 unit of length from the trunion to the roller tip.
If you tighten the middle down with the valve end fixed the ratio now becomes the overal length of both numbers at 2 units vs the 1 unit of length from the tip to the middle of the rocker or 2/1 or 2.0 ratio that direction. Basically when you are preloading the lifter you are pivoting on the valve tip end which stays motionless and pressing down in the middle or where the polylock is and then the pushrod cup end moves down even more or in this case twice as much.
.083 tighter on the polylock anotherwords is more than that at the pushrod cup because of the motion ratio. If you have an adjuster at the end of the rocker right over the pushrod and you tighten it down .083 you have also added exactly that much preload. Tightening down the polylock or rocker arm hold down bolt though adds more than that amount of preload at the lifter.
If you tighten the middle down with the valve end fixed the ratio now becomes the overal length of both numbers at 2 units vs the 1 unit of length from the tip to the middle of the rocker or 2/1 or 2.0 ratio that direction. Basically when you are preloading the lifter you are pivoting on the valve tip end which stays motionless and pressing down in the middle or where the polylock is and then the pushrod cup end moves down even more or in this case twice as much.
.083 tighter on the polylock anotherwords is more than that at the pushrod cup because of the motion ratio. If you have an adjuster at the end of the rocker right over the pushrod and you tighten it down .083 you have also added exactly that much preload. Tightening down the polylock or rocker arm hold down bolt though adds more than that amount of preload at the lifter.
Thread Starter
11 Second Club
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From: North East, MD
Update
So the one lifter is about 2 turns and all the rest 3/4. After changing the plugs it purred like a Kitten. It is SO MUCH quiter than the non-adjustables now. Don't use two turns fellows!
After changing the fouled plugs we didn't get the code and the miss is gone so it looks like I dodged all the bullets!
So the one lifter is about 2 turns and all the rest 3/4. After changing the plugs it purred like a Kitten. It is SO MUCH quiter than the non-adjustables now. Don't use two turns fellows!
After changing the fouled plugs we didn't get the code and the miss is gone so it looks like I dodged all the bullets!
Thread Starter
11 Second Club
iTrader: (24)
Joined: Mar 2008
Posts: 2,554
Likes: 2
From: North East, MD
I don't know how much it gave me but it feels a like it has more pep. It also fires up different. It is like insta-start now instead of cranking a 1/4. Scares me actually and so very quite.
If you have a 1 to 1 rocker it means you have 1 unit of length from the pushrod cup to the trunion and you have 1 unit of length from the trunion to the roller tip.
If you tighten the middle down with the valve end fixed the ratio now becomes the overal length of both numbers at 2 units vs the 1 unit of length from the tip to the middle of the rocker or 2/1 or 2.0 ratio that direction. Basically when you are preloading the lifter you are pivoting on the valve tip end which stays motionless and pressing down in the middle or where the polylock is and then the pushrod cup end moves down even more or in this case twice as much.
.083 tighter on the polylock anotherwords is more than that at the pushrod cup because of the motion ratio. If you have an adjuster at the end of the rocker right over the pushrod and you tighten it down .083 you have also added exactly that much preload. Tightening down the polylock or rocker arm hold down bolt though adds more than that amount of preload at the lifter.
If you tighten the middle down with the valve end fixed the ratio now becomes the overal length of both numbers at 2 units vs the 1 unit of length from the tip to the middle of the rocker or 2/1 or 2.0 ratio that direction. Basically when you are preloading the lifter you are pivoting on the valve tip end which stays motionless and pressing down in the middle or where the polylock is and then the pushrod cup end moves down even more or in this case twice as much.
.083 tighter on the polylock anotherwords is more than that at the pushrod cup because of the motion ratio. If you have an adjuster at the end of the rocker right over the pushrod and you tighten it down .083 you have also added exactly that much preload. Tightening down the polylock or rocker arm hold down bolt though adds more than that amount of preload at the lifter.
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So the one lifter is about 2 turns and all the rest 3/4. After changing the plugs it purred like a Kitten. It is SO MUCH quiter than the non-adjustables now. Don't use two turns fellows!
After changing the fouled plugs we didn't get the code and the miss is gone so it looks like I dodged all the bullets!
So the one lifter is about 2 turns and all the rest 3/4. After changing the plugs it purred like a Kitten. It is SO MUCH quiter than the non-adjustables now. Don't use two turns fellows!
After changing the fouled plugs we didn't get the code and the miss is gone so it looks like I dodged all the bullets!
FormerVendor
Joined: Nov 2001
Posts: 3,065
Likes: 6
From: Houston, Tx.
When you tighten this rocker arm hold down bolt or polylock down the pushrod end goes down even more.
If you had a solid lifter then the valve would move down instead of the plunger in the lifter and the valve would open and be held open.
The valve spring is stronger than the plunger spring inside the lifter and that's how the slack is adjusted for by the plunger and the spring underneath it.
Then when oil fills in under the plunger it acts as almost a solid and lash goes to zero and all is quiet.
