Prius c
#6
06-14-2011, 02:04 AM
Looks good. But I don't like to worry about the life of the batteries and the cost of their replacement. Fit's engine is perfect, if a bit too big for my taste. I would really like a 1 liter powerplant... or the diesel.
#7
06-14-2011, 02:18 AM
Join Date: Sep 2010
Location: Chicago, Illinois
Posts: 4,424
Small displacement 3 cyl commonrail turbodiesel-electric is what I want to see.
Edit: In something that doesn't weigh two tons. With the motors mounted in-board to reduce unsprung mass.
Edit: In something that doesn't weigh two tons. With the motors mounted in-board to reduce unsprung mass.
Last edited by DiamondStarMonsters; 06-14-2011 at 02:21 AM.
#9
06-14-2011, 02:24 AM
Join Date: Sep 2010
Location: Chicago, Illinois
Posts: 4,424
I4 motors often have to use "silent shafts" weighted shafts that spins 180* out of phase at twice crank speed to reduce the associated secondary harmonics. Usually this is on larger than 1.8L.
As far as NVH is concerned, its a diesel, few consumers would be able to tell the difference. And since the diesel will run constant speed in a diesel electric setup you can use the softest conceivable mounts because it is connected to a generator head and not the drivelines.
Heavy counterweights are not a huge concern either because there is typically a damper on the timing case side and a flywheel on the bell housing side of most motors that weigh a ton anyways.
Last edited by DiamondStarMonsters; 06-14-2011 at 02:49 AM.
#11
06-14-2011, 09:24 AM
When this product is available...supposedly in about a year, I'll be interested. A Honda Fit "like" vehicle that get's 60+ mpg? With gas prices rising, and only likely to rise over the next 5 years...what's NOT to like?
This however, I believe is a picture of the prototype, concept. Recent heavily masked spy shots suggest the vehicle will be much more conservative in appearance, looking something like a Prius and a Honda Fit morphed.
This however, I believe is a picture of the prototype, concept. Recent heavily masked spy shots suggest the vehicle will be much more conservative in appearance, looking something like a Prius and a Honda Fit morphed.
#12
06-14-2011, 09:58 AM
Kinda the other way around actually.
I4 motors often have to use "silent shafts" weighted shafts that spins 180* out of phase at twice crank speed to reduce the associated secondary harmonics. Usually this is on larger than 1.8L.
As far as NVH is concerned, its a diesel, few consumers would be able to tell the difference. And since the diesel will run constant speed in a diesel electric setup you can use the softest conceivable mounts because it is connected to a generator head and not the drivelines.
Heavy counterweights are not a huge concern either because there is typically a damper on the timing case side and a flywheel on the bell housing side of most motors that weigh a ton anyways.
I4 motors often have to use "silent shafts" weighted shafts that spins 180* out of phase at twice crank speed to reduce the associated secondary harmonics. Usually this is on larger than 1.8L.
As far as NVH is concerned, its a diesel, few consumers would be able to tell the difference. And since the diesel will run constant speed in a diesel electric setup you can use the softest conceivable mounts because it is connected to a generator head and not the drivelines.
Heavy counterweights are not a huge concern either because there is typically a damper on the timing case side and a flywheel on the bell housing side of most motors that weigh a ton anyways.
Engines with more than two cylinders with characteristic balance problems include:
- I3 engines have a strong balance induced rocking motion
Also check here: http://www.autozine.org/technical_sc...ne/smooth1.htm
it describes the balancing challenges for 3 cylinder engines.
Last edited by john21031; 06-14-2011 at 10:08 AM.
#14
06-14-2011, 11:28 AM
Join Date: Sep 2010
Location: Chicago, Illinois
Posts: 4,424
It seems the 3 cylinder is always described as having inherent balance problems.
Engines with more than two cylinders with characteristic balance problems include:
Also check here: AutoZine Technical School - Engine
it describes the balancing challenges for 3 cylinder engines.
Engines with more than two cylinders with characteristic balance problems include:
- I3 engines have a strong balance induced rocking motion
Also check here: AutoZine Technical School - Engine
it describes the balancing challenges for 3 cylinder engines.
No widely used engine configuration is perfectly balanced for secondary excitation.
Every engine has secondary harmonics. The closest to "inherently balanced" would be a I6/H6 or V12.
If 3 cylinders were so bad why would Daimler Benz use them in the Smart? Or VW with the Polo? Or any of the other 3 cylinder cars throughout history?
And again: in a diesel electric you can put the 3cyl on some super soft or even active engine mounts because it is attached to a generator head and not a transmission with a physical mechanic link to the ground. Aside from startup, the engine should be running at a constant speed anyways so you can pick an RPM point that doesn't produce undesirable NVH characteristics.
Last edited by DiamondStarMonsters; 06-14-2011 at 11:31 AM.
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