- Joined
- Jan 20, 2017
- Messages
- 799
- Points
- 173
Interesting use of a rotary :- https://www.engadget.com/2018/03/03/mazda-rotary-engine-returning-in-2019-as-ev-range-extender-exec/
Going electric
- Thread starter AndyRKett
- Start date
Currently reading:
Going electric
- Status
- Joined
- Mar 1, 2014
- Messages
- 4,579
- Points
- 828
Trust Mazda to do that, lol!
They've been working on it for years, there was a drivable prototype as far back 2013.
http://www.autoexpress.co.uk/mazda/2/84660/mazda-2-ev-gets-new-rotary-range-extender-engine
- Joined
- Mar 1, 2014
- Messages
- 4,579
- Points
- 828
Respect to them for daring to be different.
My understanding is that using a rotary as a generator makes far more sense than attaching it to a gearbox and driving the wheels. If it's run at a constant speed they are far more durable and the inherent smoothness, simplicity, small size and light weight makes it far more suited than a reciprocating engine.
- Joined
- Mar 1, 2014
- Messages
- 4,579
- Points
- 828
What about the thirst though? Wouldn't a rotary generator use a lot more fuel than a conventional piston engine generator?
As it's a rex not an engine it's not as much of an issue you just run it at it's most efficient rpm constantly. Also the entire point of a rex is that 99% of trips you don't use it it's only to provide a back up if the batteries are low.
If most of the time its dead weight small and light can be more beneficial than economy in use, lighter it is, less electricity you waste moving it, less likely you are to need it.
If most of the time its dead weight small and light can be more beneficial than economy in use, lighter it is, less electricity you waste moving it, less likely you are to need it.
- Joined
- Mar 1, 2014
- Messages
- 4,579
- Points
- 828
I see!
OP
OP
It may well be the perfect use for the rotary engine.
As you say constant rpm not under any heavy load and can be tuned for peak fuel economy, it might prove to be a far more reliable little engine than when used to drive the wheels directly.
A range extender generator will be an alternator and rectifier so the prime mover can run at any speed to suit the load and conditions with optimum fuel efficiency. This is a significant saving and why the "inverter" type portable AC generators are so much lighter and fuel efficient. The ultimate is a small gas turbine generator running on hydrogen with a storage battery and electric drivetrain.
I'm in the USA on business at the moment and they are advertising a new Honda plug-in hybrid with a headline 340 mile range. However when you read the small print the ev range is only 47 miles so it looks not that much better than a non plug-in. The one advantage is if you do a short trip to work plus regular longer runs you can use just one car.
Robert G8RPI.
I'm in the USA on business at the moment and they are advertising a new Honda plug-in hybrid with a headline 340 mile range. However when you read the small print the ev range is only 47 miles so it looks not that much better than a non plug-in. The one advantage is if you do a short trip to work plus regular longer runs you can use just one car.
Robert G8RPI.
- Joined
- Jan 20, 2017
- Messages
- 799
- Points
- 173
This is really going into production then. I hope it looks like this... https://www.topgear.com/car-news/geneva-motor-show/good-news-you-can-now-order-honda-urban-ev
It'll be interesting to see how that design translates into mass production, it's definitely one of the nicest looking cars IMO to appear recently. Certainly one of only a handful I could actually see myself driving.
Done over 2k miles in my Soul EV now - Spent less than £10 in paid for electric in that time.
Done my first long distance journey this weekend just gone, Norwich to Goole and back 170+ miles each way, 350 ish all in. Cost under a fiver
Done my first long distance journey this weekend just gone, Norwich to Goole and back 170+ miles each way, 350 ish all in. Cost under a fiver
- Joined
- Mar 1, 2014
- Messages
- 4,579
- Points
- 828
Out of interest, how did that work out with regards to charging?
Out of interest, how did that work out with regards to charging?
Remarkable easy tbh.
Planned the route before hand. Theres even an app (plugshare) where you put in your range between charges and start and destination and it'll pick a route with chargers on it.
I stopped twice each way. Start each end of the route on a full charge. On the way out hit the first charger with 50% still in the battery so only stopped for 10-15min. Second charge was 25-30min and I went for a McDonalds. Was done when I came out
I wasn't hanging about on parts of the route either.
Next long journey it in April, down to London for a Wedding, then to Chepstow for the weekend before coming back to Norwich.
- Joined
- Mar 1, 2014
- Messages
- 4,579
- Points
- 828
Nice! I must admit, there is aspects of owning an EV that do appeal, but at the moment, it wouldn't be viable for me.
I must admit, there is aspects of owning an EV that do appeal, but at the moment, it wouldn't be viable for me.
- Joined
- Mar 1, 2014
- Messages
- 4,579
- Points
- 828
At risk of asking stupid questions, how much do you find using the lights and heating/aircon affects the range?
On a full charge using the heating - which on the Soul is a very efficient airsource heat pump, reduces the indicated range by only 3-4 miles.
On cars like the early Nissan Leaf etc with eletric heating (think small Emerson heater setup with an element in coolant, it's crippling and will half your range!
Other electrics make no noticeable difference.
I think someone on the Leaf forum worked out the headlights will reduce your range by something silly like 200ft per charge lol.
On cars like the early Nissan Leaf etc with eletric heating (think small Emerson heater setup with an element in coolant, it's crippling and will half your range!
Other electrics make no noticeable difference.
I think someone on the Leaf forum worked out the headlights will reduce your range by something silly like 200ft per charge lol.
- Status
