cam advice for a 360
I use a set of solid lifters and adjustable rocker arms when checking a cam that has been installed into a engine already.
I use a dial indicator set on the valve reatainer taking care to keep the dial indicator as parralel as possible to the valve.
I zero out the slack in the valve train first by tightening the rocker so that the dial indicator just starts to move and then set the dial indicator to zero.
The cam is set on the base circle to start ,and then i rotate the engine to get the max lift reading.
When i checked my new 318 that has a .474 mopar cam in it,i could only get a maximum reading of .465 lift.
You never really see your max lift with a camshaft due to the other parts that are in the valve train taking a little away here and there.
One of the biggest looses is due to lifter bleed down at high rpm.
Here is some info from ray bartons sight that will help you understand where i am coming from a little better.
:read2: LINE NUMBER 2.
I use a set of solid lifters and adjustable rocker arms when checking a cam that has been installed into a engine already.
I use a dial indicator set on the valve reatainer taking care to keep the dial indicator as parralel as possible to the valve.
I zero out the slack in the valve train first by tightening the rocker so that the dial indicator just starts to move and then set the dial indicator to zero.
The cam is set on the base circle to start ,and then i rotate the engine to get the max lift reading.
When i checked my new 318 that has a .474 mopar cam in it,i could only get a maximum reading of .465 lift.
You never really see your max lift with a camshaft due to the other parts that are in the valve train taking a little away here and there.
One of the biggest looses is due to lifter bleed down at high rpm.
Here is some info from ray bartons sight that will help you understand where i am coming from a little better.
:read2: LINE NUMBER 2.
Schubeck Lifters
Flat Solid & Hydraulic Lifters
Proprietary steel composite inserts pressed into both solid and hydraulic lifters stop wear and reduce friction. Non Ceramic. No breakage worries
After putting the cam wear problem behind us, you get to enjoy two additional benefits with Schubeck “Zero Lash” Hydraulic lifter technology:
1. An RPM increase, because they will not pump-up. We all know that lifters pump up, causing the valves to hang open, which in turn, puts a lid on the engine's rev ability. The Rev limit usually starts around 6,000 RPM.
Schubeck “Zero Lash” Hydraulic drag racing lifters are a drop-in prevention for the pump-up problem because Zero Lash means no preloading of the hydraulic travel. Preloading sets the stage for lifters to pump up, which is like an RPM governor. You set the them as you would a solid lifter, but as close to "0" lash as you can get with a tight a tight .002 feeler gage. The engines' rpm limit will be higher, just like having solid lifters.
2. A power increase, because they will not leak down. Valves lose lift when leakdown occurs. Loss of power from "Leak down” occurs when the valves lose lift because the lifters fail to support the open valve under the spring pressure. This is caused by oil bleeding past the hydraulic piston in the lifter. When multiplied by the rocker arm ratio, as much as .100 or more in valve lift can be lost. You never know when it occurs or how bad you may have this power robbing engine cancer, but we do know how it can be prevented. Schubeck "Zero Lash Technology lifters restrict plunger travel, limiting the leak down to between .012-.015; if it occurs at all.
After putting the cam wear problem behind us, you get to enjoy two additional benefits with Schubeck “Zero Lash” Hydraulic lifter technology:
1. An RPM increase, because they will not pump-up. We all know that lifters pump up, causing the valves to hang open, which in turn, puts a lid on the engine's rev ability. The Rev limit usually starts around 6,000 RPM.
Schubeck “Zero Lash” Hydraulic drag racing lifters are a drop-in prevention for the pump-up problem because Zero Lash means no preloading of the hydraulic travel. Preloading sets the stage for lifters to pump up, which is like an RPM governor. You set the them as you would a solid lifter, but as close to "0" lash as you can get with a tight a tight .002 feeler gage. The engines' rpm limit will be higher, just like having solid lifters.
2. A power increase, because they will not leak down. Valves lose lift when leakdown occurs. Loss of power from "Leak down” occurs when the valves lose lift because the lifters fail to support the open valve under the spring pressure. This is caused by oil bleeding past the hydraulic piston in the lifter. When multiplied by the rocker arm ratio, as much as .100 or more in valve lift can be lost. You never know when it occurs or how bad you may have this power robbing engine cancer, but we do know how it can be prevented. Schubeck "Zero Lash Technology lifters restrict plunger travel, limiting the leak down to between .012-.015; if it occurs at all.