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Old 10-21-2010, 06:12 PM   #1 (permalink)
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Turtle Two Cylinders better than 3/4 ? (discussion of Fiat Twin Air 900cc 2-cyl engine)

I want to start a discussion on the efficiency of these engines based on Fiat 500's Twin Air engine as well as the proposed two-cylinder BMW engine (according to Dr. Klaus Draeger, BMW development chief Link

Fiat's 500 Twin Air is quite a remarkable little car. It's 900cc turbo0charged engine sports 85HP and a healthy 155 Nm (115 lb·ft) @ 2000rpm. Aided by this "beast" of an engine...more of a gremlin ...the car goes from 0-100km/h in 11s and can reach 107 MPH. And the most important aspect, Fuel Economy....4.0 l/100 km (about 60MPG). It even sounds great as well
Listen to it here

As for the proposed BMW, it would have a 1000cc engine, same 2-cyl. configuration and between 80-100HP. Knowing BMW and their meticulousness they should be able to squeeze more power with possibly better FE.


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Last edited by Laurentiu; 10-21-2010 at 06:21 PM.. Reason: added image
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Old 10-21-2010, 06:24 PM   #2 (permalink)
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sounds interesting, like the opposed two cylinder, even if they have separate throws. I think typically less cylinders = more efficient.
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Old 10-21-2010, 08:28 PM   #3 (permalink)
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...sounds like a motorcycle engine, but without the "ringy-dingy" sound.



...and, Fiat should've painted the number (43) on the sides to go along with the Petty Blue color (wink,wink)!

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Old 10-21-2010, 08:32 PM   #4 (permalink)
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FINALLY! I've been waiting for such things for a looooong time. Wonder if they'll make it N. America before I croak.
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Old 10-21-2010, 09:39 PM   #5 (permalink)
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Well, Fiat 500 will soon (early 2011) be delivered in the US. Let's just hope they'll bring this engine over as well, sooner or later...

More info: Here
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Old 10-21-2010, 09:54 PM   #6 (permalink)
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Quote:
Originally Posted by Laurentiu View Post
Well, Fiat 500 will soon (early 2011) be delivered in the US. Let's just hope they'll bring this engine over as well, sooner or later...

More info: Here
My subaru is a twin 2 cycle air cooled

My estimate is you would have to buy a motor in europe and ship the darn thing here to swap into a US made car.

Like the smart the US 500 will probably get 20mpg less than the one in Europe.

Cheers
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Old 10-22-2010, 01:57 AM   #7 (permalink)
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Two cylinder engines are not as well balanced as four bangers, the Fiat 126p's rear would shake and dance like a bee in its hive. Balancing might be easier if it's a two-stroke with the pistons travelling in opposite directions.
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Old 10-22-2010, 07:57 AM   #8 (permalink)
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Oh, gosh, it was rattling about a lot, huh ? but Fiat has worked hard to eliminate vibration on the TwinAir.

126p engine sound/rattling about


Quote:
Originally Posted by rmay635703 View Post
My subaru is a twin 2 cycle air cooled

My estimate is you would have to buy a motor in europe and ship the darn thing here to swap into a US made car.

Like the smart the US 500 will probably get 20mpg less than the one in Europe.

Cheers
Ryan
Which model do you have ? The Sambar , R2 or the 360/450 ?

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I guess ultimately someone could bring the engine over and have it swapped.
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Old 10-22-2010, 08:59 AM   #9 (permalink)
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what they've done is a eliminate the transfer of NVH from motor to the occupants. if you opne the twin's bonnet with the motor running, the motors actually Rocks on its mounts !!! and thats with a balancer shaft!

love the idea and already booked a test drive!
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Old 10-22-2010, 11:21 AM   #10 (permalink)
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Quote:
Originally Posted by robchalmers View Post
the motors actually Rocks on its mounts !!! and thats with a balancer shaft!

love the idea and already booked a test drive!

Have you seen it live , in action ?

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