Comments on: BMW Hydrogen 7

By: ysyslys

ysyslys — Tue, 31 Oct 2006 21:59:46 +0000

ohhhhhh My God. W4e need to inserting "black Snack" during filling. the filling hose feel heavyyyyyyyyyyyy.

By: rexis

rexis — Tue, 31 Oct 2006 09:21:08 +0000

BTW, it is very nice to see that Paul is posting information about green cars. Appreciate it. Good job.

By: rexis

rexis — Tue, 31 Oct 2006 09:19:32 +0000

With all due respect, indeed, FCX is a concept, and hydrogen-7 is production ready, but not a single word about how much it will cost? So does it necessary, who will buy it erxactly? Lets not discuss where do we get all the hydrogen and will it solve our global warming problem. Burning pure energy fuel in an extremely inefficient V12 burner is simply a waste of resources and cash. No? You see, 6000cc of 260hp, is really pitifully little, and its only get 200km range on H2. NGV taxi with bigger tanks can go further then that.

Pro tuners can easily squezz 500hp or more out from a 2000cc engine.

Anyone who interested how the liquid hydrogen tank works, refer below:
http://www.greencarcongress.com/2006/09/bmw_annou…

By: protonGL

protonGL — Tue, 31 Oct 2006 03:34:41 +0000

regardless what type of fuel they use,

7 series is a waste, 5 people the sit in still have to stretch legs, stupid isntit,

prefer the MPV than this Big Massive Wasteful ,not so beautiful, 5 seater.

if feels more first class with the MPV.

By: SoMeOnE

SoMeOnE — Tue, 31 Oct 2006 01:55:35 +0000

260 hp?..i get more in a tubo charged straght 4!!!!!! and its a v12…..i know its for economy..but why a v12 then?

By: holy_cow

holy_cow — Tue, 31 Oct 2006 01:16:31 +0000

rexis, you're not factoring in that the FCX is a concept (a highly conceptual concept, at that) utilising expensive fuel cell technology that, while more efficient than hydrogen combustion, is still not production-ready. The Hydrogen 7 is a production car, let's not forget. I've read that the best application for liquid hydrogen combustion will be in fleets, where use and refuelling of the vehicles are constant and regular – due to boil-off and other related issues. As far as I know, that's exactly the application BMW has in mind for the Hydrogen 7 – it's being marketed as a fleet car for governments and businesses.

I'm curious about one issue that rexis raised, though – how exactly did they build the tank for this thing and keep it cost-effective?

And szw, the alleged overheating gearboxes are not BMW's fault, it's all because of global warming, so once they solve global warming with the Hydrogen 7, everything will be ok again. Do you think I'm talking nonsense? Well, it was the only way I could possibly conceive of your comment being relevant to Paul's post.

By: szw

szw — Mon, 30 Oct 2006 21:13:56 +0000

760li gearbox sux, very easy to overheat wan .

By: DG

DG — Mon, 30 Oct 2006 17:40:52 +0000

yup thats a "HUGE AND LONG ELEPHANT TRUNK YOU MIGHT CALL IT!"

By: whodz

whodz — Mon, 30 Oct 2006 14:44:55 +0000

wow, that is a scary pump hose.

By: rexis

rexis — Mon, 30 Oct 2006 09:15:47 +0000

4G63T, it is correct, hydrogen has more energy then gasoline per mass basis, therefore 8kg for 200km is reasonable if you burn the hydrogen in a gas burner.

Honda FCX is capable of achieving 70miles per kg of H2 on a fuel cell. So this BMW hydrogen 7 is seriously considered a gas guzzler and a waste of valuable resources.

Paul, did you forgot to mention that the tank full of liquid hydrogen will boil off mostly after 2 weeks of no usage? And dont forget to talk about the cutting edge technology that BMW used to make that liquid hydrogen tank.

By: 4G63T DSM

4G63T DSM — Mon, 30 Oct 2006 08:11:43 +0000

Goes 200km with 8kg of liquid hydrogen? Thats pretty amazing considering hydrogen has far less energy per mol compared to petrol. Even compact cars with small engines would have problems getting that sort of numbers running with 8kg of petrol…. sure there isn't a typo somewhere?

Would be more likely to be 80kg than 8.