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Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Fri Jun 26, 2026 7:03 am
by weeksy
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Fri Jun 26, 2026 1:25 pm
by Mr Moofo
I once rode a Brick. I hated how it handled - not too sure I can quantify. It was like it had a hinge behind the headstock
But they are not lookers - no matter how people try ....
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Fri Jun 26, 2026 1:35 pm
by Count Steer
I had a bike with one of those K series engines (1200) and I'd liken them to the engine in a Moggy Thou. Solid chuggers.
In a bike - Sporty? No. Suitable for a big tourer? Yes. (The later K is a far more
beast).
That one ^^^ is 7 sorts of ugly. The bar end mirrors are the
pièce de résistance - the final ugly cherry on the top.
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Fri Jun 26, 2026 1:54 pm
by Horse
The only good part about a K100 is its engine. Smooth delivery of torque almost from tickover. Really easy to ride.
So to try and make something 'sporty' from one is a stretch ...
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Fri Jun 26, 2026 2:11 pm
by KungFooBob
That's a K1100 it's got twice as many valves as the K100
There's been a few very well developed Brick race bikes in the BHR B.E.A.R.S class, most of them made by BSK Speedworks.
https://www.bskspeedworks.co.uk/bmw.html
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Fri Jun 26, 2026 9:27 pm
by mangocrazy
Dominance over what, precisely? Reason and good taste, perhaps?
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Sat Jun 27, 2026 7:10 am
by Le_Fromage_Grande
Isn't the K engine based on a Peugeot car engine
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Sat Jun 27, 2026 10:44 am
by Horse
Le_Fromage_Grande wrote: Sat Jun 27, 2026 7:10 am
Isn't the K engine based on a Peugeot car engine
Half a point
Google says:
The original concept prototype for the motorcycle's engine was built by adapting an inline-four engine from a Peugeot 104.In 1977,
BMW engineer Josef Fritzenwenger mounted a liquid-cooled Peugeot engine completely on its side longitudinally into a motorcycle frame. This specific layout (later dubbed the "flying brick") lowered the center of gravity and aligned perfectly with BMW’s traditional shaft drive.
While the concept proved the layout was viable, BMW designed the production K-series engine from scratch . They binned the Peugeot block in favor of developing their own highly advanced, double overhead camshaft (DOHC) inline-four engine for the production K100.
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Sat Jun 27, 2026 11:10 am
by Count Steer
Horse wrote: Sat Jun 27, 2026 10:44 am
Le_Fromage_Grande wrote: Sat Jun 27, 2026 7:10 am
Isn't the K engine based on a Peugeot car engine
Half a point
Google says:
The original concept prototype for the motorcycle's engine was built by adapting an inline-four engine from a Peugeot 104.In 1977,
BMW engineer Josef Fritzenwenger mounted a liquid-cooled Peugeot engine completely on its side longitudinally into a motorcycle frame. This specific layout (later dubbed the "flying brick") lowered the center of gravity and aligned perfectly with BMW’s traditional shaft drive.
While the concept proved the layout was viable, BMW designed the production K-series engine from scratch . They binned the Peugeot block in favor of developing their own highly advanced, double overhead camshaft (DOHC) inline-four engine for the production K100.
The thing that sticks in my mind was, after the bike had been standing for a while, on starting there was always a little puff of smoke from the exhaust. I think that because of the orientation there was a little bit of oil seeped past the rings if given time. It wasn't enough to ever worry about constantly checking the oil level.
Re: Asserting Dominance: Powerbrick’s Radical K1100RS Streetfighter
Posted: Sat Jun 27, 2026 2:40 pm
by Horse
Count Steer wrote: Sat Jun 27, 2026 11:10 am
The thing that sticks in my mind was, after the bike had been standing for a while, on starting there was always a little puff of smoke from the exhaust.
I heard the same explanation.
Thing that struck me with this one was that they have lost the comfy angled-out footrests
