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Old 10-24-2015, 12:33 AM   #1 (permalink)
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why has noone made a car engined bike

i ask..... as the peugeot 208 1.6 gets 97 or something mpg...... in a car.... supposedly

or even a vauxhall 1.3 hdti diesel which is fitted to more models of car then i can even remember can be got off ebay for not alot of money...... ive seen rear ended crash damaged write offs sell for like 600 quid for an 09... and i meant he entire car

i know car engines are big.... but ive seen bikes with all kinds of stupid sized engines in.....

i know the thunderstar diesel did... and the track ...

i dont understand why so few people have ever tried this, especially in the diy world that you lot all love

i wish i had a workshop...... and... spare money.... but mostly a workshop

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Old 10-24-2015, 09:27 AM   #2 (permalink)
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Honda CBR250R FI Single - '11 Honda CBR250R
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90 day: 60.68 mpg (US)

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90 day: 42.77 mpg (US)

Kawi Ninja650 - '07 Kawasaki Ninja650
90 day: 54.85 mpg (US)

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The best 206 on spiritmonitor is logging 69 mpgUS. An average Honda Innova gets 120. A PCX or CBR125R are over 100 mpgUS. A small diesel bike could break 200 mpgUS but the exhaust emissions are to high.
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Old 10-24-2015, 01:29 PM   #3 (permalink)
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For any company the question is "How many people will buy it?" Motorcycles are on the market with offerings from 50cc to 1600cc or whatever a big cruiser might sport. Do you want a commuter scooter, a sport bike, a cruiser, or a touring bike? The whole machine is designed for a purpose and to satisfy a customers desires. A gas engine compared to a diesel engine of comparable output will be lighter, cheaper, and less efficient. With a lighter vehicle such as a motorcycle the power to weight ratio is more critical. Does the price of fuel offset the gains in efficiency? Since a diesel engine may have twice the compression ratio the vibrations are more noticeable. In the Vetter Challeges we see the 250cc gas bikes can compete with the 650cc diesel entry. Whether a diesel powered trike is a good idea in terms of a marketable product will depend on fuel prices and regulations. Consumers will move to buy products of perceived value and convenience.
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Old 10-24-2015, 02:09 PM   #4 (permalink)
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Old 10-24-2015, 02:36 PM   #5 (permalink)
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Honda CBR250R FI Single - '11 Honda CBR250R
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90 day: 65.9 mpg (US)

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90 day: 60.68 mpg (US)

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Yeah, i should say, good numbers would be possible from a diesel motorcycle but not with any engine taken from a car. There are already some outstandingly nice and fuel efficient motorcyles available. Rather than reinventing the wheel again (50cc turbo thread) let's try to get more people to adopt what we already have. And for people that don't need more than 35 mph, start pushing ebikes forward now that battery tech is mature.
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Old 10-24-2015, 07:55 PM   #6 (permalink)
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i didnt really mean why does noone produce one to sell..... it would be expensive and noone would buy it

i meant in the diy world or people on here and the like..... if an engine can get that kinda millage.... it was 97 or whatever uk .... dunno what that is in us,,, its the same engine they used to set a 141mpg record..... that was probably set a steady 30mph on an oval but my point is the engine must be supper efficient .... seems like a good start for an streamlined bike or trike

also emissions dont even get tested for bikes over here
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Old 10-24-2015, 08:41 PM   #7 (permalink)
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Honda CBR250R FI Single - '11 Honda CBR250R
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90 day: 65.9 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 42.77 mpg (US)

Kawi Ninja650 - '07 Kawasaki Ninja650
90 day: 54.85 mpg (US)

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90 day: 103.38 mpg (US)

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What bike do you ride now?
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Old 10-24-2015, 09:05 PM   #8 (permalink)
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xjr1300.... quarter ton curb weight.... hence why this seems like a good idea to me
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Old 10-24-2015, 09:22 PM   #9 (permalink)
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Honda CBR250R FI Single - '11 Honda CBR250R
90 day: 103.51 mpg (US)

Ninja 250R SE Green - '09 Kawasaki Ninja 250R SE
90 day: 65.9 mpg (US)

2001 Honda Insight stick - '01 Honda Insight manual
90 day: 60.68 mpg (US)

2009 Honda Fit auto - '09 Honda Fit Auto
90 day: 42.77 mpg (US)

Kawi Ninja650 - '07 Kawasaki Ninja650
90 day: 54.85 mpg (US)

PCX153 - '13 Honda PCX150
90 day: 103.38 mpg (US)

2015 Yamaha R3 - '15 Yamaha R3
90 day: 81.28 mpg (US)
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Why not start with a CBR250R or PCX150 and join the ranks of the daily riders. The PCX gets 120 mpgUK with no mods or special techniques.
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Old 10-24-2015, 09:26 PM   #10 (permalink)
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For better/worse, much more automotive tech has been showing up in motorcycles in the past ten-ish years. Much of this has been driven by EPA and EU emission standards. EPA was pretty hands-off from 1980ish thru 2006 when they dropped the hammer which essentially requires catalytic converters for the larger bikes to meet.

http://www3.epa.gov/otaq/regs/roadbike/420f03044.pdf

In some sense, motorcycles are getting off easy, considering they are allowed to emit 10-20 times the controlled pollutants per mile than a new car. OTOH, the size and weight constraints present with bikes, would make meeting car standards impossible. Meeting emissions with diesel powered motorcycles would be doubly impossible for the same reasons.

While scooters and small bikes can get 75ish mpg pretty easily around town while meeting EPA requirements, all bikes run into an aerodynamic brick wall at highway speeds where one's lucky to get 50 mpg.

Too, while things recently have been changing, relatively few motorcycles are used daily for commuting in the USA, so the small-bike market here is limited. Honda probably makes more money on one Gold Wing sale than 20 of the ~250cc class. Cruisers and sportbikes being the most profitable here, higher-tech development has been largely confined to increasing horsepower and adding doodads, often well beyond the point of sanity. (How about a Ducati 1298(cc) weighing ~420 lbs with 205 hp, for example?) My 1978 Suzuki GS1000 (994cc) gets 43 mpg, my 1998 Ducati ST2 (944cc) gets 43 mpg and you'll struggle to find many large bikes that do any better today.

However, perhaps that is changing. Honda seems to be doing pretty well with a series based on 2 cylinders of a Fit engine which increases average mpgs by about 50%. It's a significant modality shift though, and it remains questionable whether these truly modern motorcycles will be accepted well enough to be widely adopted.

2012 Honda NC700X Review - Video - Motorcycle.com

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