QUOTE(Elliot Cannon @ Mar 22 2017, 11:45 PM)
The Bkool unit works about 1 1/2 to 2 hours. You can carry extra ice in the front trunk (if you have one) to replenish the ice you have already used. This is actually a pretty good system and yes, pilots use it primarily for take off and landing or any time they are on the ground in a hot climate. You can turn it off when at altitude because it is usually much cooler once you are in the air. I used a home made system not unlike the Bkool system and I could get about an hour of really cool air with a much less efficient system with a much smaller ice chest. The limiting factor is how much ice you can carry. I think it has a great potential and I might try the Bkool myself this summer.
Elliot - now you're REALLY not helping me. I called Bkool today and talked to Bob (Bob is Bkool) for about 30 minutes. The only reason I did not order one right there was I was walking the dog and didn't have my wallet. Seriously he seems like a great guy to deal with. He is also a long-time Porsche owner, currently driving a Macan.
He said it will work great in a car as long as it's blowing directly on you and you don't mind stopping every 2 hours for ice. I don't mind frequent stops and in a 914 it would be hard to not have the air blowing on me. He said block ice lasts 2 hours and cubed or crushed lasts an hour and a half. I'm leaning towards the Bkool versus messing around with a homemade contraption. The high in Phx was only 69F today so AC is not a priority.