fits year: 1936–1940.

( Brand: Thompson ), ( Manufacturer Part Number: S780 ), ( Type: Exhaust Valve ), ( Ipn: Tol90136c ), ( Oe/oem Part Number: 90136c, C90136c, 90136-c ), ( Country/region Of Manufacture: United States ), ( Vintage Part: Yes )
The Thompson S780 exhaust valve is a crucial component for the Waukesha BK, BM, and BZ engines used in various applications between the years 1936 and 1940. This documented New Old Stock (NOS) part is a direct replacement for the original valve, ensuring the accurate restoration or maintenance of these vintage engines.
This exhaust valve is meticulously engineered from high-quality steel material to provide durability, strength, and extended operational life. Each valve undergoes rigorous inspections and stringent quality control measures to ensure precision in dimensions, weight, and other essential specifications. The valve's sturdy construction makes it an ideal choice for handling high thermal loads in your engine.
The S780 exhaust valve features a strategically designed squish-band geometry, designed to ensure a consistent seal and optimal performance under various engine conditions. The valve's stem diameter, seat area, and guides are manufactured to the exacting original specifications for guaranteed compatibility and optimal engine function.
Additionally, the exhaust valve's face is precision-cut and hardened for a longer wear life, ensuring longevity and superior performance in your engine. Its shallow seat design enhances the exhaust valve's durability and helps prevent hot gases from blowing past the valve seat.
By opting for the Thompson S780 exhaust valve, you'll not only maintain the authenticity of your Waukesha BK, BM, or BZ engine but also safeguard its optimal performance. This replacement valve is an essential investment for both hobbyists seeking a perfectly restored engine or professionals requiring premium-grade components for their clients' projects.
Thomson S780 Exhaust Valve for Waukesha BK, BM, BZ Engines (1936-1940): Pros and Cons
The Thomson S780 exhaust valve is a replacement option for Waukesha BK, BM, BZ engines manufactured between 1936 and 1940. This valve is a new old stock (NOS) part that can be beneficial for restoring or rebuilding these vintage engines. In this article, we will discuss the pros and cons of buying a Thomson S780 exhaust valve for Waukesha BK, BM, BZ engines.
Pros:1. Authentic and Original: Thomson S780 exhaust valves are new old stock (NOS), which means they are original to the period and maintain the authenticity of the engine. They are made from high-quality materials and meet the original specifications, ensuring the best possible performance and appearance.
2. Proper Functioning: New exhaust valves ensure proper combustion chamber ventilation, which helps these engines run efficiently and effectively. The new valves eliminate the need for constant adjustments and potential issues that can arise from worn-out valves.
3. Durability: Thomson S780 exhaust valves are built to last and are designed to resist corrosion and other forms of wear. This durability ensures that the valves will function correctly for a long time, saving you the cost and hassle of frequent replacements.
Cons:1. Cost: Thomson S780 exhaust valves may be more expensive than modern, aftermarket exhaust valves or even rebuilt original valves. The higher price tag can be a deterrent for those working on a budget or looking for a more cost-effective solution.
2. Installation Complexity: Installing new exhaust valves requires specialized tools and skill. The procedure can be time-consuming and complex, especially for those who are not experienced with engine rebuilding. Having a professional mechanic or engineer perform the installation may add to the overall cost.
Conclusion:Thomson S780 exhaust valves offer several advantages for Waukesha BK, BM, BZ engines, including authenticity, proper functionality, and durability. However, their high cost and the complexity of installation can be drawbacks for some. Ultimately, the decision to purchase new Thomson S780 exhaust valves depends on your priorities as a restorer or rebuilder, as well as your budget and available resources.
Recommendation:For those seeking the best performance and authentic look for their vintage engines, Thomson S780 exhaust valves are an excellent investment. However, if you're working on a tight budget or not confident in your ability to install them, you may want to consider alternative options, such as rebuilding existing valves or using aftermarket replacements. Ultimately, it's essential to carefully consider the pros and cons before making your decision.
NOS exhaust valve by Thompson for: 1936-1939 Waukesha BA BL valve, 1936-1938 BM 1935-1938 BK exhaust, 1936-1940 BZ.