09-28-2020, 09:30 PM | #127 | |
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09-28-2020, 09:33 PM | #128 | |
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What country are you referring to ? |
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09-28-2020, 09:39 PM | #129 |
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The USA? lol. Where does it get below -30? I thought even Illinois or Minnesota don't really go below -30. You should be able to store a lithium titanate at -40F=-40C.
I've only lived on the East Coast for 2 years but the coldest I saw was -5F in NYC and -19F in Vermont in mid-January 2019. 2020 winter was much warmer than that. |
09-28-2020, 10:02 PM | #130 | |
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Tesla states in their manuals to not expose the vehicle to -20 or below for more than 24 hours. I would assume because it damages the batteries or puts too much strain on the heating elements attempting to keep the batteries warm enough to prevent damage. |
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09-29-2020, 12:25 AM | #131 | |
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09-29-2020, 12:46 AM | #132 | |
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09-29-2020, 01:16 AM | #133 | |
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I just did a little research, apparently Tesla's coolant freezes at -30C = -22F, but if you leave the car plugged in, it'll warm the coolant to keep it liquid. The batteries themselves can be stored safely at -40, but of course you have reduced power and no charging capability below 0C. Apparently they use propylene glycol instead of ethylene glycol, which stays liquid a few degrees colder. |
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09-29-2020, 02:05 AM | #134 | |
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Yes, Koenigsegg makes stuff magically lighter. One way they do this is through the use of exotic materials like titanium and carbon fiber. Another way is with 3D printing their turbos and other parts using a honeycomb structure like below, and also using variable geometry turbo that allows for a much smaller and lighter turbo than having a big turbo without the veins. In the case of the 3-cylinder, they are just using two small turbos sequentially I believe instead of one big turbo. Another way is with their Freevalve engines that lack cams, cam chains, cam gears, etc. and eliminates the need for a wastegate, precat on the exhaust manifold, throttle body and other things.
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09-29-2020, 02:34 AM | #135 | ||
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I think I said earlier in the thread to purchase stock in extension cord companies. The future with plug in ev's is going to be hilarious. |
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09-29-2020, 04:38 AM | #136 |
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The RX8 had horrible fuel economy, but a rotary with higher rotor temperatures will dramatically reduce the unburned HCs and bring fuel efficiency near piston engines (at the cost of torque). It's been documented by Paul Moller's research. A mild hybrid system can make a hot running engine usable at low revs. If I ever have too much money, I'm going to have some aluminum side housings and zirconia coated titanium rotors made for the Renesis and run it at 11000rpm XD
Do you really think Koenigsegg Freevalve is much lighter than a cam driven system? There are separate actuators over each valve (which are very powerful because they need to open the valve in 1ms), plus the air source consumes a huge amount of power. He says "we can remove the throttle body to save weight", but throttles were never heavy to begin with. Likewise, do you really think the 3d printed turbo is that light? It's still a huge amount of steel. Also notice the crankcase isn't even carbon fiber. The 70kg claim is probably the long block + the turbo + intercooler. It almost certainly does not include accessories, motor-generator, radiators, or the exhaust. Anyways, yes electric motors should be able to get near 10hp/kg like Lucid Motors says with very high speed motors. Motorcycle engines do around 4hp/kg. Rotaries can do around 6hp/kg. If you need a very large amount of power, electric motors will be lighter. If you need a modest amount of power, then gasoline can still win since the fuel tank is so light. Last edited by serialk11r; 09-29-2020 at 05:11 AM. |
09-29-2020, 08:31 AM | #137 |
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09-29-2020, 09:28 AM | #138 | |
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https://www.sciencemag.org/news/2018...without-carbon |
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09-29-2020, 09:32 AM | #139 |
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Why is that?
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09-29-2020, 09:53 AM | #140 | |
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All the exhaust of the 3 cylinders via 3 exhaust valves is going to one turbo at low rpms then all the exhaust via 6 exhaust valves goes to both turbos at high rpms. This is one of the benefits of Freevalve, which is the ultimate control of the system without the need for butterfly valves or other complicated actuators.
https://www.koenigsegg.com/gemera/ti...-giant-engine/ Quote:
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