How to Improve LXi Engine Cooling Performance

[davidbrady]

(11-23-2013 21:16)Hisham Amaral Wrote:  David
Try to run the engine at Idle and see what will be the temps and how long does the cooling fan run. The only reason we used shroud is to disallow re circulation of air into the and around the cooling fan.
I agree that the system will run cooler and fan does not engage as often as it would when there is a shroud. Better airflow path. Be sure you get the engine to temperature before you run the idle test.
Hish

Thanks Hish, I very much value your experience and input on this. From what I've seen bus manufacturers have taken steps over the years to restrict hot air recirculation (HAR). When I spoke with Youngs Trasportation and Tours (my transit bus operator here in Asheville) they said Prevost used to hang a neoprene curtain down to almost road level to stop HAR. In this thread we spoke about an air cylinder powered louver which could be as simple as a slotted plate in tracks used to cover over the louvers in the lower shrouding. The question on my mind is, "will louvers in the lower-radiator shroud be worth it; will they perform adequately"? And, we'll get to that at in a moment.