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Why Increase the Flow Through the CR500 Cooling System

CR500 phi Flow graph 3.10.19

July 6, 2023

We strongly suggest you consider increasing the flow rate of the coolant through the cooling system by installing an MSV Racing High-Volume water pump impeller if:

1: You have any cooling issues you want to solve after you know your cooling system is working to spec
2: If you want to extract the max performance from your engine. Dyno testing has proven that 2T engines whose core temperature goes above 95*F start to lose power.

The reason increasing the flow rate of coolant works is because the rate of heat transfer from the engine to the cooling system is directly proportional to the mass flow rate of coolant. It is based on the coolant in the system transferring heat on the principal of source (engine) to sink (radiator) differential and the exchange material’s transfer rate. This really comes down to the movement of electrons and how they transfer their energy to each other which in this case is through conduction and convection. According to Bohr’s model the electrons move at two million meter/sec. Let us agree that is amazingly fast.

This is thermodynamics jargon, but there are two key parts to consider.

1: How much coolant is flowing?
2: At what speed the coolant is flowing?

The more coolant that flows and the faster it flows will reduce the temperature difference between the point where the coolant enters the engine and where it exits.

This next part is not quite as intuitive.

When the temperature difference between the inlet and outlet is reduced, the average coolant temperature is lowered.

When the average coolant temperature is lowered the engine will run cooler.

This is why fitting an MSV Racing High-Volume water pump impeller, which increases the flow of coolant through the engine, improves cooling, can add power, and helps stave off heat soak.

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