Engine temperature

[wiggy]

I've just fitted an exhaust temp alarm/gauge to my VP2020D, after 1/2 hour at 2600rpm the temp was only 26 deg C. The top of the heat exchanger was hot to the touch, like a hot but not really hot radiator. Is this normal, I just expected higher exhaust temperature.

 

[VicS]

I've just fitted an exhaust temp alarm/gauge to my VP2020D, after 1/2 hour at 2600rpm the temp was only 26 deg C. The top of the heat exchanger was hot to the touch, like a hot but not really hot radiator. Is this normal, I just expected higher exhaust temperature.

½ hour at 2600 rpm under load or no load ?

 

[superheat6k]

I fitted Willhi temp monitors to the exhausts on a metal elbow about 300mm downstream of the injection inlet, and these tend to run between 28-35 c. I have set the alarm to 40c, which is wired to illuminate the otherwise unused glow plug warning lights, as my TAMD60c s don't have these.

I expect the alarm may require increasing, if we ever get Summer worth having. I figure if the seawater stops flowing the temp will increase in short order, but I don't intend to undertake a test.

When I first fitted them the temp barely rose above 21c but that was in early March. Seem reliable enough, and if they perform all season without issue, then a winter job will be to properly install them into the dashboard.

 

[Plevier]

On my 2020D the exhaust elbow never gets significantly warm. There is a lot of water flow.
The heat exchanger casing on top is just a bit too hot to keep your hand on but you can touch it briefly. The outlet pipe back to the engine - tucked away underneath the casing - is warm rather than hot.

 

[earlybird]

I've just fitted an E-bay temperature gauge/alarm on my Beta exhaust elbow downstream of the water injection point. Typical reading is between 25 and 30 deg. C.
The heat exchanger holds the fresh-water coolant which runs at 80 deg. plus.

 

[cryan]

Firstly 26 degrees will not feel particularly hot to the touch so I suspect your gauge is not calibrated correctly. Secondly, The reason you put the water manifold around the exhaust manifold is to reduce the exhaust manifold temperature to a safe level so as not to burn things surrounding it so what your feeling is not the exhaust temperature.

A rule of thumb I was taught as a engine cadet is that if you can grip something for 4-5 seconds before it becomes uncomfortable then that thing is approx 60 degrees celcius. It's actually a surprisingly accurate guide.

After water is sprayed into the exhaust it can drop its temperature dramatically so 25-30 degrees after the water injection would not be uncommon. But at the manifold before the water is mixed with gas would be.

 

[wiggy]

½ hour at 2600 rpm under load or no load ?

In gear tied to pontoon.