BMW Engines Which one ?

[Wargames]

Ok, did some reading on this issue. here goes.

Insert as per http://www.bmwmotorrad.co.za/Web/Motorc ... spx?bid=84

F650 GS

The F 800 GS’s little sister, the F 650 GS, which also has a straight two cylinder engine, is aimed at people who do not need quite as much spring travel and are looking for a little less adventure. With its lower seat height, it is an outstanding all-rounder; it is easy to control, provides plenty of power combined with economy, and is ideal for everyday use.

The new F650 GS differs from its big sister in its lower seat height, lower weight and reduced engine power. It is thus ideal for newcomers to the genre or as a sturdy all-round motorcycle for all eventualities. Compared with its predecessor, the F 650 GS with single-cylinder engine, the new model is an improvement in every way. Despite its designation, which apparently refers to the engine size, the F 650 GS has the same 800 cc straight two-cylinder engine as the F 800 GS.

With a slightly reduced engine power (71 instead of 85 HP), the focus for the F 650 GS is on the high torque at lower engine speeds and excellent economy. And yet it offers over 20 HP more power than its predecessor. The F 650 GS thus also guarantees driving enjoyment wherever it goes.

To recap: the 650gs engine is actually an 800cc engine with 71hp and 2 cylinders.
So now again, reading that, the better engine would obviously be the 85hp one. But the weight issue is still on us. Then you can just as well install a 1150.

[neandertaler]

[...] To recap: the 650gs engine is actually an 800cc engine with 71hp and 2 cylinders.
So now again, reading that, the better engine would obviously be the 85hp one. But the weight issue is still on us. Then you can just as well install a 1150.

Not to forget that it's difficult to get rid of the 650's gear box...

Cheers,

Oliver

[justin.schoeman]

[...] To recap: the 650gs engine is actually an 800cc engine with 71hp and 2 cylinders.
So now again, reading that, the better engine would obviously be the 85hp one. But the weight issue is still on us. Then you can just as well install a 1150.

Not to forget that it's difficult to get rid of the 650's gear box...

Cheers,

Oliver

I wonder how strong that gearbox is. I know on some of the big Honda bike engines, the guys remove the unnecessary gears, and weld it up permanently in 1st or 2nd gear. Then swing the prop directly off the output shaft... Doubt you could so it with this one though!

[Rudix]

[...] To recap: the 650gs engine is actually an 800cc engine with 71hp and 2 cylinders.
So now again, reading that, the better engine would obviously be the 85hp one. But the weight issue is still on us. Then you can just as well install a 1150.

Not to forget that it's difficult to get rid of the 650's gear box...

Cheers,

Oliver

I wonder how strong that gearbox is. I know on some of the big Honda bike engines, the guys remove the unnecessary gears, and weld it up permanently in 1st or 2nd gear. Then swing the prop directly off the output shaft... Doubt you could so it with this one though!

I have often wondered why you cannot just use the bike gearbox locked in a gear. I understand you need a thrust bearing but a plan can be made with that, a longer output shaft with an extra thrust bearing should do the job, will also take care of gyroscopic forces that you don't have on a bike.

Bike gearboxes are strong, I have raced many bikes with hectic power changes and never had gearbox problems.... I believe other than the thrust bearing issue plane gearboxes have a easier life than bike gearboxes.

Fly safe,
Rudi