How to calculate ambient clearance in a canopy for an engine?

[merryengineer]

Hi,

how do i calculate the ambient clearance for an engine in a canopy?

[wellandpower]

**** I make no warranty on this, if it is very critical, then you should hire an engineer to assist you ****
You need a 'K' type thermocouple and meter.

Jam the thermostat open (don't break it!) and then put the thermocouple in the hose from the engine to the radiator.

Run the unit on full load and measure the temperature of the outlet water until you get a stable reading.

When it is stable, take the measurement and:

Workout the difference between the outlet temperature of the water and the current ambient.
Then take this figure away from the maximum top tank temperature.

For example. A 404D Perkins engine has a maximum top tank temperature of 110 degrees C. The current ambient is 16 degrees.
Using the K type probe, a measurement of 81.9 degrees was recorded.

Therefore:

81.9 - 18 = 63.9
110 - 63.9 = 46.1 degrees.

Worldwide ambient clearance is said to be 46 degrees.
Temperate ambient clearance is said to be 41 degrees.

This example therefore is suitable for worldwide use.

Note that if the unit is installed in a building and airflow is therefore further restricted, these measurements will no longer apply.