Why does a thermostat have an open bypass line?
However, the open bypass was not designed to limit flow when the thermostat was open. As a result, some hot coolant always recirculated through the bypass line. The only limitation on the volume of recirculated coolant was the small diameter of the tube.
What was the bypass on a Cadillac thermostat?
The bypass in this early Cadillac comprised a small tube leading from the carburetor water jacket to the pump inlet. This was sufficient to provide some circulation when the thermostat was closed, the clear intent being to encourage fuel vaporization. However, the open bypass was not designed to limit flow when the thermostat was open.
How does the Teddington thermostat bypass system work?
Teddington was a British company, operating under the name British Thermostat. Rather than controlling the bypass with a sleeve or valve, their thermostat used the top of the bellows to do double duty and stop bypass flow when it’s at full extension. There are several drawbacks to this system.
What happens when the thermostat is open in a car?
When the thermostat is open, static pressure throughout the system will be fairly uniform, so the bypass valve closes. Here are a few photos of the bypass valve: Eventually, this system evolved into the open bypass systems used in most American cars of the 1960’s. Open bypass will be discussed in the main chapter on bypass systems. Chrysler 1934
What is the purpose of the bypass hose?
A bypass hose is a specific hose with a specific function. That function is to bypass a limited flow of coolant through the engine before the thermostat has opened. On a 2nd gen Escort, that bypass function is provided by the rattly thing in the thermostat housing.
What does a thermostat bypass on an engine do?
Bypass Thermostats This design of thermostats uses a bypass system to speed engine warm up . When the engine is cool the thermostat is closed. This allows coolant to circulate through the engine by way of a bypass canal located directly below the thermostat. As the engine warms up, the thermostat begins to open allowing coolant to
What is engine coolant bypass hose?
The bypass hose is to allow circulation of coolant until the engine warms up enough to open the thermostat. When you remove the bypass hose, you have to have some type of recirculation to happen, or you will induce hot spots, air, etc., in the system causing temps to spike up and down erratically.
What is a coolant bypass pipe?
Dorman’s Engine Coolant By-Pass Pipe is engineered from high-quality plastic for long-lasting durability. Replacement protects the engine against loss of coolant, thereby helping to prevent overheating and possible extensive internal engine damage.