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Winona Van Norman VSG4720
Newen Fixed-Turning, Contour-BB
Serdi 100 HD
T&S Machine The System 2000XL
Valve Seat & Guide Equipment Selection
In order for a valve to seat correctly, for efficiency and power, engine builders must replace or bring back to spec all valve seats and guides
By Brendan Baker
Cylinder head work is one of the mainstays of any engine building operation, and these components often require valve guide and seat work to restore them for service or to improve performance. In order for a valve to seat correctly, for efficiency and power, engine builders must replace or bring back to spec all valve seats and guides.
Seats that are cracked, loose, sunken or destroyed in some manner must be replaced with new. Drilling, reaming, replacing valve guides, removing worn, loose or damaged valve seats, cutting new seat counterbores and machining valve seats are all part of the reconditioning process that your shop must be able to handle as efficiently as possible and with precision and accuracy.
There are a few different kinds of seat and guide machines available today to fit most budgets. The first kind of machine is not much more complex than a drill press and is often referred to as such. In these seat and guide machines the tooling sets in a solid column and the table floats to move from guide-to-guide. These are very basic seat and guide machines that have some limitations compared to more advanced machines, however, there are still some small shops and hobbyists that use this style of machine. A small shop may not be able to justify the larger, more expensive machines, and many of these small shops simply don’t have the volume to be concerned about doing hand grinding and lapping.
The second level of seat and guide machines is the floating powerhead system. These machines have become the industry-standard for many engine builders today. This equipment, according to the manufacurers we surveyed for this article, run in the price range of about $18,000-$30,000, depending on the options and manufacturer you choose. On these machines, the cylinder head is stationary underneath a floating powerhead. The powerhead floats above on flat ways that adjust front-to-back and side-to-side.
The powerhead weighs much less than the cylinder heads, so when you center the powerhead, a procedure similar on most models, it floats and centers with the pilot. Once it is centered over the pilot, you let off the foot pedal to lock it in place. This setup gives you a very rigid platform.
Modern cylinder heads often have canted valves so on an older-style machine you have to tilt the fixture to machine canted valve seats and guides. The fixture is relocated and set for each guide. When using a modern seat and guide machine, the powerhead tilts, allowing you to adjust the powerhead for whatever angle you need. Once you’ve set the powerhead angle you can go up and down the line with the same tilt angle for each valve seat. Some machines can accommodate up to 15 degrees of rotating tilt.
Today’s valve seat and guide machines also use three-blade carbide cutters with three-angles or more. These cutters, or form tools, give you a very consistent profile and concentricity because the profile is built into the tooling. Manufacturers vary with the type of tooling each offers, but all are essentially a form tool with built-in angles.
The third style seat and guide machine is the “live pilot” design. Whereas a “dead pilot” design remains stationary in the guide as the tooling rotates, a live pilot spins with the tooling in the guide. You have to be very precise when fitting live pilots into guides otherwise too much play could result in a seat that isn’t completely round. Some live pilot machines have a single blade carbide cutter that can adjust while it spins to create almost an infinite number of profiles.
Electronic Level Built-in, 360 Deg. Cradle,
Toolbox, Vacuum Tester Built-in
One-year on machine and tooling
Maximum Tilt (either side of zero):
Maximum Cylinder Head Length (with diesel fixture):
25˝L x 53˝W x 80˝H
208/208/ 220-volt, single phase, 15 amp
Company: Rottler Manufacturing
Universal 360 Rollover Fixture, Tool Storage Rack, Built-in Cabinet
Fast, easy installation of valve guide inserts; Spot facing of valve guides and bosses; Cuts valve insert pockets (aluminum or cast iron); Simultaneous multi-angle cutting of valve seats; Drilling and tapping for threaded studs or removal of broken exhaust studs; Bronze guide liner installation and reaming
Company: Sunnen Products Company
Metric wrench set with hex keys
3-angle insert tooling
Drill chuck (#3 Morse Taper)
Dead pilot system
Drills and reamers
Variable speed spindle
Digital RPM readout display
360-degree rotation air table
Rugged, heavy duty column
Company: Peterson Machine Tool
Winona Van Norman VSG4720
90˝ L x 34˝ W x 77˝ H
818084 Tooling Package, Fast Mount Bar, Head Mount Plate, Hex Key Set, Standard, Electronic Level .01 deg. Res., Leveling Pads, Adapter, Alignment Rod, Canted Valve Alignment Bar
Boring Head Tilt 15 deg. (30 Total), Serdi Style Spindle Taper, Air Float Boring Head, Hydraulic Boring Head Clamping System, Fine Feed for precision machining
Company: Winona Van Norman
Newen Fixed-Turning(R) Contour-BB(TM)
220-240V/20 Amps/1 Phase/ 50/60 Hz
Spindle Tilt (Rotation):
One single tool to machine any profile, any valve seat diameter, any valve seat material … All FIXED-TURNING® machines allow machining as small as one hundredth of a millimeter (.00039˝) on an entire profile, regardless of its length, while providing perfect geometry of the seat (circularity, angle, concentricity). The numerical control automates depth adjustments within + or - .01mm or .00039˝
Serdi 100 HD
The new SERDI 100 HD has a combination workhead on double air cushion, equipped with an upgraded high-torque spindle, which is operated by a 2.2kw motor, and a highly rigid bed that can carry heavy cylinder heads with an easy travel front to back on air cushion table and pneumatic clamping. This new model is 216 percent more powerful than the previous Serdi 100 heavy duty model.
Company: Serdi Corporation
T&S Machine The System 2000XL
T & S Machine’s System 2000 cylinder head center is a machine that can handle all of the your shop’s cylinder head work, whether your work is general automotive, high performance, or diesel. The System 2000 is simple, versatile, rugged and fast. Offered with one of the most complete tooling packages in the industry.
Company: T & S Machines and Tools
To find more information about these and other Valve Guide and Seat Machines, click on the Buyers Guide tab for more manufacturers of this type of equipment.