Hydrualic Roller VS. LLR VS. Traditional Solid Roller
Your wording still seems backwards. An all aluminum engine will “GROW” the lash about ten
If Crane wants 22 hot then room temp is twelve. Different cam companies shape their lobes to safely run with specific clearances
Steve is only referencing tight lash. Which are quiet stable and easy on valve train parts.
And there is no blanket yes or no to your magic “more” question
Manipulating the lash specs can simply change the rpms where it makes its torque. Too far either direction can wreak havoc on parts and usually points towards the wrong grinds specs for the build
If Crane wants 22 hot then room temp is twelve. Different cam companies shape their lobes to safely run with specific clearances
Steve is only referencing tight lash. Which are quiet stable and easy on valve train parts.
And there is no blanket yes or no to your magic “more” question
Manipulating the lash specs can simply change the rpms where it makes its torque. Too far either direction can wreak havoc on parts and usually points towards the wrong grinds specs for the build
Assuming, the parts shrunk together, that is the steel push rods and lifters as well as the block and heads, the lash would increase anyway since the steel contracts less than the aluminum, So, on cold start up the sticks would really clatter, while the LLSL set up shrinks to zero. Interesting. When I mentioned this to Cranes back then, I was instructed that that amount of lash was needed and that the lash section of the heel would take it up. This immediately made me realize the cams are obviously ground differently. Second, Cranes at that point had never heard of a low lash cam set up.
Anyway, Cam Motion found a way to offer a solid camshaft without the cost of adjustable rockers. Interesting.
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This rises from the dead. I did not understand what some forum members were driving at, at the time. My question concerned why the lash was set at zero cold for low lash solids. Answer. It grows to .010 when hot due to aluminum expansion. OK. So, it operates at .010 instead .022 when hot. What was lost at the time, is that .022 hot lash was Crane's hot lash spec for their cams. An aluminum motor would shrink (contract) about 10 thousandths from that setting when cold. So ,the cold lash would be closer to.032 after shinkage, which I thought was alot.
Assuming, the parts shrunk together, that is the steel push rods and lifters as well as the block and heads, the lash would increase anyway since the steel contracts less than the aluminum, So, on cold start up the sticks would really clatter, while the LLSL set up shrinks to zero. Interesting. When I mentioned this to Cranes back then, I was instructed that that amount of lash was needed and that the lash section of the heel would take it up. This immediately made me realize the cams are obviously ground differently. Second, Cranes at that point had never heard of a low lash cam set up.
Anyway, Cam Motion found a way to offer a solid camshaft without the cost of adjustable rockers. Interesting.
Assuming, the parts shrunk together, that is the steel push rods and lifters as well as the block and heads, the lash would increase anyway since the steel contracts less than the aluminum, So, on cold start up the sticks would really clatter, while the LLSL set up shrinks to zero. Interesting. When I mentioned this to Cranes back then, I was instructed that that amount of lash was needed and that the lash section of the heel would take it up. This immediately made me realize the cams are obviously ground differently. Second, Cranes at that point had never heard of a low lash cam set up.
Anyway, Cam Motion found a way to offer a solid camshaft without the cost of adjustable rockers. Interesting.
You still don't get it.
This rises from the dead. I did not understand what some forum members were driving at, at the time. My question concerned why the lash was set at zero cold for low lash solids. Answer. It grows to .010 when hot due to aluminum expansion. OK. So, it operates at .010 instead .022 when hot. What was lost at the time, is that .022 hot lash was Crane's hot lash spec for their cams. An aluminum motor would shrink (contract) about 10 thousandths from that setting when cold. So ,the cold lash would be closer to.032 after shinkage, which I thought was alot.
Assuming, the parts shrunk together, that is the steel push rods and lifters as well as the block and heads, the lash would increase anyway since the steel contracts less than the aluminum, So, on cold start up the sticks would really clatter, while the LLSL set up shrinks to zero. Interesting. When I mentioned this to Cranes back then, I was instructed that that amount of lash was needed and that the lash section of the heel would take it up. This immediately made me realize the cams are obviously ground differently. Second, Cranes at that point had never heard of a low lash cam set up.
Anyway, Cam Motion found a way to offer a solid camshaft without the cost of adjustable rockers. Interesting.
Assuming, the parts shrunk together, that is the steel push rods and lifters as well as the block and heads, the lash would increase anyway since the steel contracts less than the aluminum, So, on cold start up the sticks would really clatter, while the LLSL set up shrinks to zero. Interesting. When I mentioned this to Cranes back then, I was instructed that that amount of lash was needed and that the lash section of the heel would take it up. This immediately made me realize the cams are obviously ground differently. Second, Cranes at that point had never heard of a low lash cam set up.
Anyway, Cam Motion found a way to offer a solid camshaft without the cost of adjustable rockers. Interesting.
Different systems I suppose.
So, you are saying the block shrinks .010 but the pushrods don't shrink at all. They contract at a lesser rate than aluminum, but no shrinkage at all? Also you are setting the lash at zero when cold. When hot that would open to about .010. Cranes suggests .022 when hot and that the lash section of the cam will take it up. These Cam Motion cams must have different lash grinds for it to work. When I talked to Cranes, they explained the valve train needed the lash and that they did not know what Cam Motion was doing. They did not say it was wrong, but that their cams would not work with such tight lash adjustment.
Different systems I suppose.
Different systems I suppose.
Extreme cold conditions and/or extremely hot engines will have more variation. It does not matter who's camshaft that you use, these are the expansion rates you can expect on a typical production, standard-deck LS engine. Tall deck blocks or larger engines will experience more growth.
Lash adjustments recommended by the camshaft manufacturer are based on the lobe design. It is best to follow the manufacturers recommended lash setting for their design to start. Small adjustments can be made to lash in an effort to fine tune the performance of a given engine. However, loosening (increasing) the lash too much can create harsh conditions and cause damage to the valve train. Consult the manufacturer on the maximum lash range for a given lobe design for your particular application if you intend to deviate from the recommended lash to help avoid damage to your valve-train.
Let me know if you all have any questions on this and I will try to answer them. ~ Steven
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