BMW R1250 GS Yeni Boxer Motor 2-stage cam timing animation

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BMW R1250 GS Yeni Boxer Motor 2-stage cam timing animation

Postby spacey1 » Fri Sep 14, 2018 3:15 pm

Pretty slick engineering... not variable valve timing per se, but, on the inlet valve camshaft only there is 2-stage valve lift and 2-stage valve timing.

Quite clever in it's execution. It looks to optimize air flow velocity into the cylinder at part and wide open throttle.

The engineering looks like it could prove robust over time too...

Himalayas Royal Enfield Tour 2017; Camp Cook-Off Winner 2017; Kennedy Ranges; Three Oceans Tour Australia; Hyden-Norseman Breakaways; R1200 series final drive repair; Mt Augustus; Bimbijy Station; Around Oz
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Re: BMW R1250 GS Yeni Boxer Motor 2-stage cam timing animati

Postby spacey1 » Fri Sep 14, 2018 4:15 pm

Alpha Racing Variable Valve Timing for BMW R1200 boxer engine.

Alpha Racing Power Boxer: https://vvl.alpharacing.com/en/

Here's another version referred to as Variable Valve Lift from Alpha Racing that produces 146 ps.

It looks like it only operates on the inlet valves too. Another interesting feature is that there is no 'throttle butterfly' in the throttle.

This setup uses inlet valve lift and duration to control the air flow going into the engine.

Removing the throttle butterfly should equate to more wide-open-throttle power due to the fact that there is no impediment to air flow at the throttle.



Himalayas Royal Enfield Tour 2017; Camp Cook-Off Winner 2017; Kennedy Ranges; Three Oceans Tour Australia; Hyden-Norseman Breakaways; R1200 series final drive repair; Mt Augustus; Bimbijy Station; Around Oz
spacey1
 
Posts: 559
Joined: Tue Aug 10, 2010 8:08 pm


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