After 20K miles on the 1250 GS & 1250GS ADV - A honest review
- Thread starter Boxerlust
- Start date
No, the HP2S is 12 years old and still the most powerful twincam boxer BMW have produced. The other HP2 models Enduro and Supermoto uses the older 1200 hexhead engine.
The basics of any IC engine stays the same where the most common factor is the Otto 4 stroke principle. When the engine is designed for a purpose or specific configuration then the engineering behind it is different to other engines. The main reason being the unique characteristics of the design and the engineering development to make it suitable for everyday use and confirming to legislation. By purely guessing because an engine looks the same and thus should perform like another is ridiculous. It is not impossible to make an engine perform better but the more power you chase the less returns you get. Better to start from scratch and design it into the engine than modifying it and risk engineering in reliability, fuelling, breathing and exhausting and oil supply issues.
Materials used in engine production are so much better that reliability should not be a problem up to a point but the restriction is usually breathing and exhausting and fuel supply. You can starve the oil supply by running higher rpm or if the load (torque) on the engine journals increase you can actually force the oil out and have metal to metal contact. You can induce unwanted vibrations in either the primary components or the ancillaries which presents another issue to be dealt with. Clutches and flywheels have to be adapted to suit etc etc. I have been down that road and at some point you realise that you will lose by continuing with the mods. It is fun but also a pain.
BMW has openly said that they are not in a hp race with other manufacturers. If that is what you want then you should look at other manufacturers and make your bed. The touring and street bikes are unique in design and fills a niche. The fact that we have more engine configurations amongst motorcycles is to be celebrated because it is getting limited amongst cars while we can still saviour bike tourers with lots of torque, screaming 4 cylinder sports bikes, good old single cylinder thumpers and everything in between.
But claiming this or that without substance is what the internet is all about and much of it evident on here.
Tanneman not all you said is wrong but let me explain to you the new watercooled Harley motor is no V-twin because it has 2 crankpins and not a single one like the old Harleys do....
Ermmm.... so a motor with 2 cylinders arranged in a V formation with a common crankshaft is not a V twin...... Well, well, well, I never knew that. So by the same measure, a motor with 2 cylinders arranged in a 180 degree, horizontally opposed formation on a common crankshaft is not a flat-twin either? This is the most educational thread that I have ever read! I can see the next revelation now, “all it needs is 17” wheels, 160 bop and be able to cruise at 155mph with full luggage... blah, blah blah! What a Cnut!
I have read some crap in my life but you are right up thereAnyway it has been some form of entertainment while I'm on compulsory leave.
Have you been caught shagging the cleaner at work again ... ??
Actually, ....erm, to tell the truth. He tricked me into it
If I don't take this annual leave I will lose it. So it was either me getting paid out or take a month off. I chose the latter.
You quoted HP2 (not HP2S), not me. I just did a quick web search and didn't find a twin cam one. Pls post a link as I'm genuinely interested.
It was also you who suggested looking for the similarities. Out of interest, of the mechanicals, what are not similar?
I never suggested that if an engine looked the same, then it should perform like another - looking at the images you produced for comparison would give you no idea of cam timing etc.
I'm also aware that Boxerlust's constant desire for a bike he's never going to get is tiresome, but that doesn't automatically make him wrong in every instance - most yes, but not all
Not the whole of my reply was to you.
Here is an old MCN review. https://www.motorcyclenews.com/news...3/january/jan1413-the-ultimate-bmw-hp2-sport/
Once again the bike that was used in the endurance races where not the same as the one sold to the public. Different front suspension as in forks (Marzocchi I believe), not telelever, and the engine was a more powerful.
Yes I am ! ..No milk float and nothing electric
So what do you drive professionally ?
I still wonder where the similarities start and end between Porsche flat 6 and BMW boxer. The only similarity is that it is a horisontally opposed engine. By your reasoning the Subaru has probably more in common with the BMW boxer and the Honda Goldwing should be a rocket ship.
Look at the picks below and tell me what is similar between a 997 NA flat 6 and a 1250 boxer?
I very much doubt that the 1250 engine would be able to reliably push past 150 bhp without same major consideration being made to the engine balance ie vibrations (rocking couple), breathing and exhausting, rpm limit for such a big piston and oil supply. The twin cam HP2 couldn't be engineered to handle more hp without modifying the oil pump to be reliable in the long run.
Talking HP and displacement is pub talk ie bullshit. By that reasoning I should be able to drag race and win any car with a Scania V8 for example and a Unimog 5023 would be a piece of shit but yet there are few vehicles that can do what it does. Just piss off with such ridiculous unsubstantiated statements.
The new goldwing IS a rocket ship (compared to older versions). I've had mine up to 70mph.....Honest officer !
For the few guys who have a clue and not clueless misconceptions...Both engines Porsche GT3 and BMW Sfitcam are opposed piston.Both have 2 different cam lobes.Both have the same bore but the Porsche 4 mm more stroke.So theoretically the BMW boxer/flat 2 can make MORE hp than the Porsche boxer/flat 6 because the BMW has LESS piston speed so theoretically can rev higher...The only limiting factor would be vibration on the crank which easily could be solved with a 3rd crank bearing like the R18 Big Boxer uses because of the huge pistons/weight that is moving.
But as it is the 1250 shift cam boxer does not need it because it has the SAME redline as the Porsche 911 GT# engine that is 9000 rpm...All BMW has to do is increase bore or stroke or Both slightly which is very easy to do to bring up the displacement to 1332 cc ( + 78 cc ) and do some headwork to make top hp @ around 8500 rpm and voila you would have reliable 165 hp and 155 nm Torque...That would be finally enough to have a fun and entertaining motorcycle engine for road riding for many seasons to come
Put that in a R1350XR which would be a GS optimized for pure back-road riding as also a R1350S a bike as sexy and good looking like the R1100S still is and also capable for backroad riding,touring and the occasional track day
That would be awesome if the next Boxer-generation out in a couple of years brings these bikes to celebrate 100 years of BMW Motorrad in great fashion...
We fans,loyalists and boxer lovers,believers ands diehards deserve nothing less
And of course TELELEVER
No stinking forks or chaindrive !
But as it is the 1250 shift cam boxer does not need it because it has the SAME redline as the Porsche 911 GT# engine that is 9000 rpm...All BMW has to do is increase bore or stroke or Both slightly which is very easy to do to bring up the displacement to 1332 cc ( + 78 cc ) and do some headwork to make top hp @ around 8500 rpm and voila you would have reliable 165 hp and 155 nm Torque...That would be finally enough to have a fun and entertaining motorcycle engine for road riding for many seasons to come
Put that in a R1350XR which would be a GS optimized for pure back-road riding as also a R1350S a bike as sexy and good looking like the R1100S still is and also capable for backroad riding,touring and the occasional track day
That would be awesome if the next Boxer-generation out in a couple of years brings these bikes to celebrate 100 years of BMW Motorrad in great fashion...
We fans,loyalists and boxer lovers,believers ands diehards deserve nothing less
And of course TELELEVER
No stinking forks or chaindrive !
Still waiting for an answer, and maybe even photos.
I think you forgot to draw the other piston and cam followers?
After 20K miles on the 1250 GS & 1250GS ADV - A honest review
She’s probably unhappy because we buried her 18 months ago ! (Ex wife)
Arsey I hope that this is not your peniz...Otherwise I understand why your wife is so un-happy...Obviously Not because you bought her a fake chinese Benelli...
She’s probably unhappy because we buried her 18 months ago ! (Ex wife)
yofi...I thought Arsey had more class but probably lots of practice drawing his junk on bathroom stalls... Anyways back to the main topic after a misguided detour of a clueless Harley and Africa Twin rider that obviously suffers from small rod syndrome...
And one more thing for the googlers and wikipedias...The HP boxer is still the highest horsepower aircooled twin no matter what configuration but a 1250 shift-cam puts out more hp and way more torque as also BMW like Porsche and maybe Ferrari knows like no other manufacturers how to build the highest specific hp and torque engines...Look at the S1000RR compared to the Honda CBR1000RR-R....The Honda makes from 13800 to 14200 about the same hp as the BMW S1000RR but everywhere else the BMW makes way more horsepower and torque ! In combination with the tall gearing Honda accomplished with the new Fireblade to make the worlds first 1000 superbike that is slower in roll-on than a CBR600RR which already felt weak as a clogged vacuum...
yofi I hope your BOS sounds as good as a Bose...
Anyways back to the main topic after a misguided detour of a clueless Harley and Africa Twin rider that obviously suffers from small rod syndrome...And one more thing for the googlers and wikipedias...The HP boxer is still the highest horsepower aircooled twin no matter what configuration but a 1250 shift-cam puts out more hp and way more torque as also BMW like Porsche and maybe Ferrari knows like no other manufacturers how to build the highest specific hp and torque engines...Look at the S1000RR compared to the Honda CBR1000RR-R....The Honda makes from 13800 to 14200 about the same hp as the BMW S1000RR but everywhere else the BMW makes way more horsepower and torque ! In combination with the tall gearing Honda accomplished with the new Fireblade to make the worlds first 1000 superbike that is slower in roll-on than a CBR600RR which already felt weak as a clogged vacuum...
yofi I hope your BOS sounds as good as a Bose...
I'm sorry Arsey...I buy you a beer or 2 at the Suppenkuche when the weather gets warmer...Kali sucks right now with cold weather and snow...Global Warming - we need it desperately
But don't be a dick
But don't be a dick
Still waiting for an answer box of rust
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