Investigation of the Effect of Changes in Coolant Pressure on Local Boiling in Engine

Ghasemi Zavaragh, Hadi; Rahmatinejad, Bahman

doi:10.48301/vjtve.2026.517582.1112

Investigation of the Effect of Changes in Coolant Pressure on Local Boiling in Engine

Articles in Press

Document Type : Original Article

Authors

Hadi Ghasemi Zavaragh ¹

Bahman rahmatinejad ²

¹ Department of Mechanical Engineering, National University of Skills (NUS), Tehran, Iran

² Department of Mechanical Engineering, National University of Skills (NUS), Tehran, Iran.

10.48301/vjtve.2026.517582.1112

Abstract

The cooling system is essential for the optimal operation of internal combustion engines. Regular maintenance and monitoring can enhance its performance and extend the engine's lifespan. This study examined the effect of changes in coolant pressure on local boiling in the Ford MVH418 engine. Tests were conducted at eight different speeds and two loads of 15% and 30%. A Cussons dynamometer was used to measure load and torque. Coolant pressure was measured at three points: the inlet and outlet of the radiator and the engine inlet, using an MPS500 pressure sensor. Results indicated that at high RPMs and heavier loads, engine warm-up time is reduced. Additionally, the greatest pressure difference observed in all tests was between the radiator inlet and outlet, which increases with higher RPMs and applied loads. For example, at a load of 30%, this pressure difference reached a maximum of 10.6% at 1500 RPM and 38.3% at 3000 RPM.

Keywords

Engine

Cooling system

Local boiling

Pressure changes

Subjects