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How important is a valve's role in your engine? As simple as it may seem, this is the doorway for all air being process in your engine. When we choose a valve for one of our race engines, there is much more than just picking a familiar name. How was it manufactured, what is the heat treatment process for the tip, what are the flow characteristics, does my valve manufacturer deliver a consistent product? How will it hold up to the abuse of high rpm and high spring pressures? For a turbo engine, how much heat can this valve take before it starts to distort and change shape? For an alcohol motor, is the material too brittle for cooler operating temperatures? If a head breaks off the valve, this little $15-20 piece can cost you an entire engine, and thousands of dollars. What about flow? If you ever read my tech article on head porting, you would have seen me mention that CFM gained in a cylinder port on a Honda can generate about 1 hp for every 2.5 CFM gained.....however, CFM picked up at the valve itself as opposed to other areas of a port can produce closer to 1 hp for every 1 CFM. Valve flow and controlling the motion of that valve is critical.
4 Piston Racing 37mm K20/K24 Intake Valve |
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Introducing the only off-the-shelf 37mm 50 degree intake valve for your K-Series engine. Other aftermarket valve designs actually flow less than the OEM Honda valve of equal size. This valve flat out flows! Up to 7 cfm gain per valve over the same size 45 degree off the shelf valves and 25 cfm more than a stock size 45 degree valve. This valve also features a dished head for reduced weight.
Many racers and engine shops are creating their own 50 degree valve starting with a 45 and cutting it down. When this is done the margin gets thin and the integrity of the valve is compromised. Our valve was designed in house and has been tested in our own engines for years with high spring pressures and high rpm. These valves are always in stock here at 4 Piston Racing.
These valves are discounted to existing 4 Piston cylinder head owners and when purchased as a part of our CNC Cylinder heads |
4PR-INT3750-1 |
single intake valve |
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4PR-INT3750-8 |
set of 8 intake valves |
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Ferrea 6000 Series Competition Valves |
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Ferrea Valves, the world’s leading manufacturer of racing valves, introduces the Sport Compact market into the already race-proven Ferrea 6000 Series Competition Valves. This Ferrea Valves Series is designed to provide excellent reliability in an environment of high RPM and high spring pressures, at a budget price. These valves have higher fatigue resistance and tensile strengths than our competitor’s best offering. The 6000 Series Competition Valves are specially designed for street, drag and rally racing applications. To manufacture the valves we use our exclusive two-step slow-forging process applied to the special alloys selected to suit intake and exhaust applications. We provide a unique heat-treatment and stress-relieving process, along with hard chrome stems and friction-welded hard tips. We finish the valves with a swirl-polished head. Ferrea Valves feature flow improvements to deliver the power needed for today’s sophisticated Sport Compact racing engines. |
F6073 |
35mm Intake (set of 8) |
$128 |
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F6074 |
36mm Intake (set of 8) |
$128 |
F6071 |
30mm Exhaust (set of 8) |
$128 |
F6072 |
31mm Exhaust (set of 8) |
$128 |
Ferrea 5000 Series Hi Performance Valves |
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The 5000 Series Valves have become the alternative for performance & street engine builder that use our competitors “street” or “performance valve”. These valves are produced in our state-of-the-art CNC centers allowing for tight tolerances and cost-effective design.
FEATURES
• ONE-PIECE FORGING STAINLESS STEEL
• PROPRIETARY HEAT TREATMENT PROCESS
• FLAT FACE
• HIGH COMPRESSION APPLICATIONS
• HARD CHROME STEMS
• FULLY CNC MACHINED
These valves provide customers with Ferrea quality at a Budget Price, and are designed for Street Performance engines, mildly modified applications.
We do not recommend these valves for drag racing or road racing engines. They are suitable for high performance street engines. |
F5510 |
35mm Intake (set of 8) |
$100 |
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F5511 |
36mm Intake (set of 8) |
$100 |
F5508 |
30mm Exhaust (set of 8) |
$100 |
F5509 |
31mm Exhaust (set of 8) |
$100 |
Ferrea Competition Plus Valves |
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This is Ferrea's top of the line valve for your Honda engine. This valve is suitable for all horsepower levels and especially engines that will experience extreme exhaust temperatures from forced induction. |
F1548P |
35mm Intake (set of 8) |
$176 |
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F1549P |
36mm Intake (set of 8) |
$176 |
F1546P |
30mm Exhaust (set of 8) |
$176 |
F1547P |
31mm Exhaust (set of 8) |
$176 |
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