RE: New R1250 engine

R1200RS + R1250RS Forum � 1200 RS technology � Exhausts and Engine � New R1250 engine

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#16 | RE: New R1250 engine datum

Fri Sep 21, 2018 11:18 am

Zitat von Richard230 im Beitrag #14
Did you notice that the new engines use a HiVo type toothed-drive system for the cam shafts? This type of chain was used by the Japanese on some of their motorcycles during the late 1970's and early 1980's. It was supposed to be very reliable. I always wondered why they dropped that sort of chain and returned to a roller chain to drive the cams and clutches. Cost, perhaps?

I also found it interesting that the new engines have two knock sensors so that they can use fuel with octane below 91 in the U.S. and 95 RON, elsewhere. Like the RS already does?

My workshop told me that the LC engine has no knock sensor. I had the problem on my last trip to Czech, Slovakia and Hungary, which is the first time in 60.000 km's i've had any trouble with that. And i've done a lot of km's in easter european countries. But funny thing though - just before departure i had it in for service, where the did an software update - and the sound when popping on downgearing has changed a little bit from normal. When i got home from vacation i had it in for service again - and there was a now software update. Now the popping are back to normal.....

these members like the post: duccrazydave and Richard230

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#17 | RE: New R1250 engine datum

Fri Sep 21, 2018 4:14 pm

No knock sensor? I can't believe that. BMW has been installing knock sensors on their motorcycle engines for quite some time, ever since they started having to deal with very lean fuel mixtures to meet emission standards. Plus, this article mentioned that BMW has added an "additional" knock sensor to the new engine.

Current motorcycle collection: 2002 Yamaha FZ1; 2005 Triumph Bonneville T-100; 2011 Royal Enfield Bullet 500; 2009 BMW F650GS; 2016 BMW R1200RS; 2011 Zero S 16.6 kWh

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#18 | RE: New R1250 engine datum

Fri Sep 21, 2018 5:20 pm

Zitat von Richard230 im Beitrag #17
No knock sensor? I can't believe that. BMW has been installing knock sensors on their motorcycle engines for quite some time, ever since they started having to deal with very lean fuel mixtures to meet emission standards. Plus, this article mentioned that BMW has added an "additional" knock sensor to the new engine.

I would be quite surprised if you're right. My workshop has been authorised BMW workshop for 23-24 years. But if anyone in here knows if they are wrong, please let me know ....

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#19 | RE: New R1250 engine datum

Sat Sep 22, 2018 1:00 am

My 98 and 00 R1100S would detonate at low revs, high throttle and anything under 98 octane (Oz measurement).
I learned to ride around the issue.
The RS is fed 95 octane and will accept 91. No audible detonation with it. It must have a sensor IMHO.
My 81 Yamaha XV 1000 R H was so undemanding that during a "petrol strike" (this concept will be foreign to most of the world these days) and there was no fuel to be had, I was able to ride to a BP station and fill it up with BP Zoom 2 stroke lawn mower fuel. It ran fine on it and gave me another week's commuting. It was a low compression motor and of simple 2 valve SOHC design running carburetors and electronic ignition. No fancy engine management or polution gear on it.

I would like to apologize to anyone I have NOT offended. Please be patient. I will get to you shortly.

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#20 | RE: New R1250 engine datum

Sat Sep 22, 2018 2:37 am

The 1100 oilhead did not have a knock sensor. Pretty sure when the 1200 came out in 2005 to had one.

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