Ford FE Engine Rocker Systems: Ultimate Guide
Aug 30, · This video covers the installation of roller lifters, roller rockers, and pushrods. It also covers how to align the rocker arms and set up pushrod guide plat. Jan 04, · Roller Rockers Install Guide - Armed And Ready How to install roller rockers. Sean Haggai Jan 4, Share. View Full Gallery. Excessive .
Factory-style rockers, whether original equipment or aftermarket replacements, are steel or ductile iron with either a ball or cup pushrod end and a radiused contact for the valve.
The factory non-adjustable how to develop an email marketing list system is a simple system that works for common street use. The end rockers are unsupported, which is fine for a stock rebuild or mildly built street engine. However, if a larger, aggressive cam and stiffer valvesprings are installed, the rocker system is susceptible to breaking. Factory rockers come in adjustable and non-adjustable designs.
Adjustable-style factory FE rockers have an you are what u eat threadadjuster screw on the pushrod end and use a cup-type pushrod, as compared to the ball end used with the non-adjustable rockers.
The interference thread is designed to remain in position when adjusted but often loosens in service after many adjustments have been made. The ratio for adjustable rockers is normally quoted as being 1. The rockers ride directly on the shafts with no bushings. If you see a set with bronze bushings, they have been reconditioned. While bronze is likely a better wear surface than steel alloy, the cross section and strength of the rocker itself has been reduced and it is more prone to break.
Factory rocker assemblies use springs between each rocker to keep them located on the shaft. The end rockers each have a spring washer, flat washer, and cotter pin for retention. The shaft-mounting pedestals on most FE engines are cast aluminum with a round passage for the shaft to slide through. On certain performance applications, the pedestals are steel with a horizontal split in the shaft passage, allowing the pedestal to clamp onto the shaft.
The additional clamping and support is important. The factory shaft setup has a tendency to fracture at the head-mounting hole because the end exhaust rocker is unsupported. The mounting hole on the factory pedestals is often larger or oblong in the section below the shaft to allow more oil to reach the shaft. The pedestals used in high-riser and tunnel-port applications are considerably shorter than the more common parts and cannot be interchanged.
Shafts are gun-drilled steel and have holes for the mounting fasteners as well as for oiling. Oil runs up through the second pedestal on each head, through the center of the shaft, and out the oil holes to the rocker. If there are oil holes on only one side of the shaft, they must face down, toward the cylinders during installation. Factory shafts have holes for cotter pins and cup plugs at each end. The cotter pins serve double duty—retaining the end exhaust rockers, and adding insurance that the cup plugs stay in position.
Instead, it bottoms out and gives a false torque reading. This can lead to catastrophic valvetrain failure. There were different-length OEM rocker bolts depending on the head and rocker pedestal used. The reduced-shankdiameter bolts such as these are used in the oil-feed location.
Note the length differences. The original FE rocker system is considered a weak point, and should be upgraded to match the specific high-performance build. Installing adjustable rockers is the most common initial upgrade so the engine is compatible with an aftermarket cam, modified or milled block, or heads.
A billet rocker stand set with end supports offers a good amount of insurance against shaft breakage at a modest cost. Detail of the popular Dove roller rockers, shims, and spacer set is used for valve tip alignment. Made of heattreated aluminum, these parts can handle valve lift up to around. Replacement or reproduction adjustable rockers are still available from multiple suppliers, and are a simple slide-on replacement for the factory non-adjustable parts.
The other change is required for the conversion is the use of different pushrods. Improved versions of the factory adjustable units were available from Crane now out of business and Iskendarian. These have flats machined into the rocker body, a longer adjusting screw, and a locknut—as opposed to the problematic interference threads found in factory parts. Aluminum roller tip rockers are a viable option as well, with costs being fairly similar how to build a fish tank from scratch the advantage of reduced practical journalism how to write news guide wear.
Horsepower differences are nominal. We recommend upgrading to the aluminum rollers at the hp or 6,rpm levels. Replacing the factory rocker spacer springs with aluminum bushings is an easy and inexpensive upgrade. Keeping the pieces together with the spacers reduces the amount of carnage in the event of a problem.
These OEM rocker bolts are what you should expect to find in the head. There should be ps3 how to fix ylod single longer, reduced-shank-diameter bolt for the rocker-oiling location and three shorter, standard-shank ones per head. The next upgrade should be in material and end supports for the rocker shafts. Heavier-duty shafts, made from better material with a reduced inside diameter, offer how to remove channels from tata sky online measure of increased durability.
Multiple suppliers offer systems to provide enough end support. The most how to reduce radiation in the home and least expensive is a U-shaped pedestal at each end of the assembly, which serves to capture the shaft and reduce flex.
These work quite well in milder applications, and are a good option for budget-oriented builds. Buying each rocker system part individually costs about as much as buying a complete rocker system. Therefore, buying a complete system is often simpler and more cost effective. Because all the parts are designed to work together, the systems offer better performance and compatibility than separate parts assembled as a complete system.
On the good ones, the geometry is right, the spacers and shims if required are in the correct positions, and the package has been proven to install and function with a minimum of added effort. Popular systems follow one of two strategies. They are either an upgraded package that shares the factory-design architecture and features a single shaft with spacers and stands or they are a complete design departure from the factory stuff, with multiple shafts and an adapter mounting plate.
For example, the kits from Dove, Harland Sharp, and Erson follow the first approach. The Erson rocker system is my personal favorite. Erson combined two of the pedestals, an end support, and a spacer into a single aluminum block, simplifying the system considerably while adding rigidity and strength. In comparison, the system by TD Machine Products uses a mounting plate and four individual shafts, with two rockers per shaft. Five long upper-cylinder-head bolts included in the kit fasten the mounting plate to the head for a much more robust assembly than stock.
However, if you use the TD setup on a factory or Edelbrock cylinder head, you must machine down the factory-style rocker mountings level with the upper row of head bolts. Note: This how to get from seville airport to city the heads unusable with any other rocker system—a significant commitment. Dove offers aluminum roller rockers for, and FE engines, and can build special application rockers. These FE rockers are slideon replacements for adjustable or non-adjustable factory parts.
Dove FE heavyduty rocker shafts are more durable than stock parts, but should still be used with an end-support system. On an FE the end exhaust rocker is unsupported and prone to flex. An end stand provides a measure of added support and prevents failure. The FE is unique because of the pushrod arrangement.
Pushrods install through tubes cast or machined into the intake manifold. It is far easier to measure for pushrod length and check for geometry issues before installing the intake because the rocker system still needs to be removed before the intake is mounted. The key items covered here are: rocker-shaft height relative to the heads, adjuster settings, and lyrics protect me from what i want position on the valve tip—both lateral and in contact pattern.
There are multiple schools of thought on the optimum rocker geometry. One philosophy focuses on minimizing the width of the contact pattern on the valve tip, another concentrates on getting the rocker parallel to the valve at the mid-lift point, and yet another targets maximum possible lift. The process of measurement and inspection is equally, if not more, important than the chosen methodology or theory because all methods yield similar results on street or moderate strip use engines.
The Erson rocker system uses the unified pedestal and spacers. You must use the supplied small-diameter AN washers when installing the rocker kit so adequate clearance is attained.
TD rocker system readily bolt ups to the Blue Thunder heads. This is the TD how to install roller rockers system for Edelbrock heads. Longer upper head bolts are required and provided to install the system on the Edelbrock heads, and you need to recognize that head studs are not compatible with this system. Picture showing a rocker tip properly centered on the valve and some that are off to the side. For proper alignment, rocker tips should be centered over the valve.
At the very least, ensure that the roller tip is completely on the valve tip and not off to the side. The only way to change the pivot geometry is to alter shaft height relative to the head or to move the mounting holes, either of which is how to install roller rockers major job. The factory-installed spring height is 1. Minimizing the width of the contact pattern probably produces the best reward on a factory-style rocker system where scrubbing occurs as the rocker travels across the valve tip.
Reducing the travel intuitively reduces side loads and improves how to install roller rockers life. But on an FE the valve contact pattern cannot be easily altered, assuming that the shaft pivot height has been corrected as necessary. If the contact pattern is off-center from the valve, try a different set of rockers.
A rocker that is too short or too long, as measured from the shaft centerline to the contact tip or roller tip, cannot be compensated for. This problem was evident with the Crane rocker system—where the rocker arms were not dimensionally correct. Unfortunately Crane went out of business before the issue could be addressed. Checking and adjusting rocker alignment with Erson rockers is similar to that of other FE valvetrain combinations, but the shims are unique due to the smaller-diameter shafts.
This roller rocker is properly aligned and shows proper valve-tip contact. To achieve correct valve-tip alignment, the rocker on the right side should be shimmed to the left a how to install roller rockers. Depending on your rocker setup, you may need a variety of shim thicknesses in order to align it.
You are looking at the valve-tip position on TD rocker Blue Thunder heads. Note the straight line through the roller axle. Proper geometry reduces the load on parts and ensures durability at high RPM, and under high spring loads.
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Oct 25, · These are the S Harland Sharp Roller Rockers Made in the USA. These Harland Rocker Arms are good for 9 plus horsepower across the entire rpm curve. They. PLEASE READ THE FOLLOWING INSTRUCTIONS CAREFULLY PRIOR TO INSTALLATION!!! INSTALLATION INSTRUCTIONS (STUD MOUNTED AND BOLT-ON): Stud Mounted: Step 1: Rotate engine to number 1 cylinder TDC. Check distributor rotor to make sure it is at the number 1 cylinder terminal. Remove valve covers. Step 2: Remove old rocker arms for number 1 cylinder. If you are converting a pedestal type cylinder head,File Size: 54KB. May 09, · The instructions that come with the Rockers say (after cranking engine to correct position) " Adjust the rocker arm nut until it is at zero lash, with no lifter preload. Then turn the nut down 1/2 to 1 turn. Once you have adjusted, hold the hex nut and tighten the set screw to ft.-lb.
One of the most critical pieces of hardware in translations of cam instructions to valve events is the rocker arm. The ratios are staggered with 1. The resulting valve lift is almost a full inch at. Accuracy and repeatability is extremely important when designing a rocker that will ultimately be plotted in CAD for CNC manufacturing. This jig allows a technician to examine and potentially modify the rocker fo production. As a solution, many enthusiasts turned to fulcrum bearing rockers and screw-in studs, but that still came with a host of problems.
Then, after you got the rockers installed, you needed a girdle to keep them somewhat supported, which made servicing take longer. Studs versus shafts: aluminum versus steel. These rockers have proven their value in performance-oriented applications for decades. However, shaft rockers Right are superior in stability and custom compatibility. Steel rocker bodies also offer a significant strength increase with minimal added weight. This is critical in high performance applications where improper geometry can lead to bad timing events, premature wear, and in some cases, engine failure.
In our case, this is a very important distinction, as the Mast Mozez head is a canted valve head with significantly altered valve placement. Contrary to a standard inline head where the valves are parallel to each other, a canted head angles the valves away from their respective cylinder wall and points them towards the center of the bore.
In addition to reducing the shrouding effect, canting the valves allows the head to accommodate a large valve without running into cylinder wall interference. Many late model and exotic head packages require a different approach in roacker design. Left Shaft-mount rockers splayed about a Hemi casting. The net effect is a larger, more efficient air passage to the cylinder. However, this also means that the valves are arranged in such a fashion that many of the valvetrain components need custom fitment.
The flexibility in placement of a shaft-mounted rocker allows us to make less dramatic changes elsewhere in the engine. Sure, we could take some of our common [rocker body] extrusions, but for the most part, we have to start with the layout and design from scratch. On a small-block this extreme, an equally extreme rocker is required. Left Mast's Mozez heads that flow over cf. Left Our huge 60 mm Comp Cam compared to a stock core. For this process, they utilize a 3D printer in conjunction with their CMM software.
Together, the package allows them to draw, print, and then test-fit parts through one or more iterations before spending resources on tooling and material on parts that need a custom fit. The process also saves the company time in development, as the process of printing a part, testing fitment, and then moving some lines in AutoCAD and reprinting it is much quicker and cheaper than tooling up a CNC.
Left Joe Josing hones trunnion and tip holes on a shipment of big-block Chevy rockers while Jose Salgado Right helps whack billet aluminum chunks into Hemi stands.
These billets go from 40 pounds to 8. In our case, we were able to print custom stands to check fit before milling them from expensive steel. After digital mockup, new designs go to an in-house machinist that focuses on taking the virtual designs, converting them to real hardware, and then modifying the rocker in the real world to verify proper fitment before a new design can be loaded into the CNC machine and go into production.
A set of billet steel rocker stands are bolted to the head. Rockers mounted on shafts are then bolted to the stands. With shaft mount rockers there is no need for studs or girdles. What about the specs? We went with 1. Specifically, the math put us at. These rockers will be under tremendous amounts of pressure as they transmit cam movement across the valvetrain and through the spring.
In addition, the 1. With the multiplied lift and the countering spring pressure, race engine rockers are under a lot of stress and sometimes fail. A proprietary blend of aluminum alloys is used to form the billet stock that machined into a rocker body. Simply explained, if a rocker meant to run miles could last 1, miles, it can be lightened.
Equally, if a rocker meant to last miles only lasts to miles, it needs more strength and likely more weight. If you have a piece of aluminum running through a million cycles and then hundreds of heat cycles, you will eventually have problems.
A rocker is a pry bar. An overhead view of the shop and its many operating stations. Build your own custom newsletter with the content you love from Dragzine, directly to your inbox, absolutely FREE!
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