Street Performance:
The Street Performance hydraulic lifters are made from a cold formed body with a clipped axle and have a 6500 rpm capability. These lifters have .120″ plunger travel and have an 80% fill rate with the test oil. The lifter wheels in this series are .700″ diameter.
Recommended Spring Pressure:
100-180lbs Seat Pressure
280-380lbs Open Pressure
Performance:
The Performance hydraulic lifters are made from a billet body with a clipped axle and have a 7000 rpm capability. These lifters (4602,5206,4603,6087) have a .750″ diameter roller wheel. These liftes have a .120″ plunger travel and have an 80% fill rate with the test oil.
Recommended Spring Pressure:
100-200lbs Seat Pressure
280-400lbs Open Pressure
Hi-RPM Series:
The Hi-RPM Series hydraulic lifters are made from a billet body and have a clipped axle. These lifters have a 7000 rpm + capability with a .120″ plunger travel and have an 80% fill rate with the test oil. These lifters (5044,5468,5294,5472,5045,5470,5879,6083,5891,6085,6072,6074) have a .750″ diameter roller wheel for the .842″ & .875″ diameter lifters and a .810″ diameter roller wheel for the .903″ diameter lifters. The internal tolerances are much tighter in this series. Do not use oil heavier than 5w40!!
Recommended Spring Pressure:
100-225lbs Seat Pressure
350-550lbs Open Pressure
HLT Series:
The HLT also know as the Limited Travel Lifters have a clipped axle and are inteneded for us in stock car classess where some plunger travel is required. These lifters (4789,5850,4795,6402,5327,5329) have between .015″-.030″ plunger travel before going solid. Due to the short plunger travel on these lifters there is some valve train noise that can be associated with them.
Recommended Spring Pressure:
100-250lbs Seat Pressure
285-650lbs Open Pressure
Installing and Adjusting Morel Hydraulic Roller Lifters:
- Do not wash in any solvent. Wipe the parts off with a lint free towel.
- Use 10W30 oil and lube the O.D. of the body and wheel.
- Make suer the lifter-to-bore clearance on cast iron blocks is: .0015″-.0017″, On Aluminum blocks that oil the lifter (LS Series) the clearance is .0014″-.0016″. Both of these measurments are at 70 Deg F. The aluminum block will have a higher rate of expansion and that is whey the clearance is tighter.
Adjusting the Zero-lash setting of the lifter:
- I always like using the firing order to set the valves. Put the engine on #1 cylinder.
- What we want is the Intake and Exhaust to be on the base circle of the camshaft
- Adjust the rocker until the push rod just starts to get tight while taking the pushrod and rolling it between your thumb and finger. Once you feel drag, this is what we call Zero-lash.
- You are now ready to tighten down on the adjuster using the following method:
- It is important to know the thread pitch, in threads per inch, of the adjuster nut, because one complete turn of the nut will move a distance of one complete thread. Therefore, verify the thread pitch of the adjuster nut, because racing rocker manufactures use different nut sizes and thread pitches.
- If your adjuster nut is 7/16×20 threads per inch, then divide 1 inch by 20 threads per inch. One complete turn down on a 7/16 x 20 adjusternut will move .050″
- Next, divide .050″ divide by 4 to calculate the distance for a quarter-turn of the adjuster nut (.050″ / 4 = .0125″)
- For a 3/8 x24 adjuster nut, the caculations are: 1″ / 24 TPI = .042″ per full turn and .042″ / 4 = .0105″ per quarter turn.
- Use the chart below to determine how many quarter turns to tighten the adjuster nut after Zero Lash
Cast Iron Block and Cast Iron Head = .020″-.025″
Cast Iron Block and Aluminum Heads = .030″-.035″
Aluminum Block and Aluminum head = .045″-.050″
5. Repeat these adjustments for each cylinder runnig through the firing order.
This article was written by John Callies, Inc.
