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Discussion Starter · #1 ·
Dear all,

I am after a bit of advice regarding radiator sizing. My intended power plant is a 9okW Hyundai motor with AC inverter, both are fluid cooled, sharing the same coolant system and pump.

I originally reckoned on being able to significantly reduce the size of the rad due to the increased efficiency of the motor. I was hoping that I could use an oil cooler slung underneath and block up the grill for added aerodynamics.

However, I have heard people advising that due to the lower temperature tolerance of the inverter electronics the radiator size needs to be pretty much unaltered.

That would be a bit of a pain and require a rethink of the layout.

Does anyone have any advice?

Many thanks,

Alec
 

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Discussion Starter · #3 ·
Hi again Duncan. Thanks for getting back.

I did run the numbers ;) and that is what got me looking at a few mocal oil coolers until I saw some advice (maybe here but I don't remember now) from someone who had gone through the process themselves.

Generally, I do tend to put a lot of trust into my spreadsheets but I am very aware that I am only really dipping my foot in here, with little practical experience.

I suppose the most important thing is to make sure that the coolant pump is up to snuff. However, as an electrical item that could fail (rather than a mechanical pump that will only stop if the engine does too) I imagine that it would be a good idea to have some passive cooling capacity in reserve.

Or maybe a monitor on the pump status/coolant temp that will cut off the motor power if necessary.

Thanks again for your insights as ever.

Alec
 

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Discussion Starter · #6 ·
Duncan, Yabert,


Thanks for the insights I did reply yesterday on the train but it seems to have got lost in the ether.


That is good news that you manage to get away with such minimal heatsinking. I am thinking that in the worst case I could cut a small hole in the fibreglass belly pan I have made and mount a small rad edge, flush with the outer surface so it is open to the outside world but not disrupting airflow too much.


Or alternatively trail the ipes around the batteries too keep the chill off in winter.


By the way, in your setups do your motor and inverter share the same coolant system?


Many thanks.


Alec
 
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