Author Topic: Goodbye to the Big K  (Read 651 times)

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Offline TomL

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Re: Goodbye to the Big K
« Reply #15 on: November 14, 2019, 10:28:53 pm »
Hi Stevie. Did you get your bike from Reiten Motorrad?

I would have got my R1250GS from Reiten Motorrad but they could not offer me a trade in on the CCM. Our favourite ride heads out that way through Newport, Thaxted, Finchingfield, Weathersfield and Sudbury.

I'm well pleased with the 1250. So different to the early boxer engines. In a way with the shift cam it doesn't even feel like a boxer.
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Offline richtea

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Re: Goodbye to the Big K
« Reply #16 on: November 14, 2019, 11:05:57 pm »
OK, what's a shift cam?

Asking for a friend.

Offline Andym535

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Re: Goodbye to the Big K
« Reply #17 on: November 15, 2019, 07:36:52 am »
German English for VTEC.
If it matters what gear you’re in, the engine’s too small.

Offline richtea

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Re: Goodbye to the Big K
« Reply #18 on: November 15, 2019, 09:19:37 am »
Ah!

To paraphrase the presenter below, '...it's like the love child of a camshaft and a gearbox'!

Good explanation here, with swearing in (mostly) the right places:
https://www.youtube.com/watch?v=Z0tYMiAnQfU

A motor under each cam cover? Crazy....

Offline Andym535

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Re: Goodbye to the Big K
« Reply #19 on: November 15, 2019, 10:21:20 am »
The Honda version uses oil pressure to activate a separate cam follower under the high lift cam lobes. It's proved to be pretty bullet proof in millions of VTEC engines. I had an S2000 and the VTEC engine in that was superb.
If it matters what gear you’re in, the engine’s too small.

Offline Matt

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Re: Goodbye to the Big K
« Reply #20 on: November 15, 2019, 11:21:15 am »
Ah!

To paraphrase the presenter below, '...it's like the love child of a camshaft and a gearbox'!

Good explanation here, with swearing in (mostly) the right places:
https://www.youtube.com/watch?v=Z0tYMiAnQfU

A motor under each cam cover? Crazy....

Ah that video was great! Pretty impressive, and yes, surprising/worrying that there's a motor living in a motor!

Oh well, not like i'll ever run a BMW bike without warranty! :,(
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Brian c. 2019

Offline chriscanning

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Re: Goodbye to the Big K
« Reply #21 on: November 15, 2019, 11:56:49 am »
The Honda version uses oil pressure to activate a separate cam follower under the high lift cam lobes. It's proved to be pretty bullet proof in millions of VTEC engines. I had an S2000 and the VTEC engine in that was superb.

Used to have great fun with a mate who numerous VFR’s when travelling Europe on the motorways cruising close too 100mph cuz I knew the VTEC would be kicking in and out driving him nuts  ;)

See for what ever reason BM have decided not to fit such in the new X/R.
« Last Edit: November 15, 2019, 11:58:35 am by chriscanning »

Offline black-k1

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Re: Goodbye to the Big K
« Reply #22 on: November 15, 2019, 12:01:10 pm »
The Honda version uses oil pressure to activate a separate cam follower under the high lift cam lobes. It's proved to be pretty bullet proof in millions of VTEC engines. I had an S2000 and the VTEC engine in that was superb.

Used to have great fun with a mate who numerous VFR’s when travelling Europe on the motorways cruising close too 100mph cuz I knew the VTEC would be kicking in and out driving him nuts  ;)

See for what ever reason BM have decided not to fit such in the new X/R.

:D Now that sounds like a fun game. We need to know the speed at which the shift cam engages for a GS and an RS when in top. That'll be the perfect speed to set my cruise control!!! :D  8)
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Offline richtea

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Re: Goodbye to the Big K
« Reply #23 on: November 15, 2019, 12:14:22 pm »
See for what ever reason BM have decided not to fit such in the new X/R.

When you have cylinders sticking out the side you've got more room to play with, maybe?
I imagine there's a bit less space in a straight four for that bloomin' leccy motor in the head. Crazy, but mighty impressive.

I daren't think of the cost if (when?) it goes wrong. Normally these things are driven mechanically or, like Andy says, by some fluid, and that's something you can look at and say 'the seal needs replacing', 'the bearings are worn - replace them', etc. Electricity is a step beyond - it works or it doesn't. Maybe it's a replaceable part - a new leccy motor every 30k or something. Or there's a failsafe position for the pins.

Anyway, Stevie is going to give it a thorough test for us.  ;D

Offline chriscanning

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Re: Goodbye to the Big K
« Reply #24 on: November 15, 2019, 12:38:40 pm »
I presume with above logic you drive A35 then  :)

Oh and shift cam is already in the RR.

Offline richtea

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Re: Goodbye to the Big K
« Reply #25 on: November 15, 2019, 01:00:09 pm »
One of these tyre-shredders, you mean?


There's probably someone out there that has squeezed a VTEC to one!
Here's a Mini with one - it's tight - tighter than a leccy motor inside a cam cover:
http://car-from-uk.com/sale.php?id=212291&country=uk





> Oh and shift cam is already in the RR.
Well spotted. So there is room in a tight 4.
« Last Edit: November 15, 2019, 01:03:14 pm by richtea »

Offline steviejuk

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Re: Goodbye to the Big K
« Reply #26 on: November 15, 2019, 01:01:30 pm »
It most certainly did come from Reiten - They offered me strong money on the K and  have been great to deal with. I can't reccomend them highly enough. They are lucky to be in the middle of some lovely riding roads. As for the shift cam, I believe its proven car tech thats trickled down - also, it is engaged by the ECU determined by engine speed, throttle angle, day of the week(!) etc, so its not at a predeterimed point. It seems to work - it goes like no boxer Beemer motor I've ever ridden. There may be some fly by wire throttle magic going on but the bottom and mid punch is surprising. I hope the only testing I do of it is to prove how reliable it is.........

Offline chriscanning

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Re: Goodbye to the Big K
« Reply #27 on: November 15, 2019, 01:11:13 pm »
The elephant in the room is the TUV it’s because of that we get all these things look in MotoGP(currently watching) or WSB and there’s very little although BM have it in their RR but currently unable to get it to last the required number of races.

Offline Matt

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Re: Goodbye to the Big K
« Reply #28 on: November 15, 2019, 02:35:22 pm »
See for what ever reason BM have decided not to fit such in the new X/R.

When you have cylinders sticking out the side you've got more room to play with, maybe?
I imagine there's a bit less space in a straight four for that bloomin' leccy motor in the head. Crazy, but mighty impressive.

I daren't think of the cost if (when?) it goes wrong. Normally these things are driven mechanically or, like Andy says, by some fluid, and that's something you can look at and say 'the seal needs replacing', 'the bearings are worn - replace them', etc. Electricity is a step beyond - it works or it doesn't. Maybe it's a replaceable part - a new leccy motor every 30k or something. Or there's a failsafe position for the pins.

Anyway, Stevie is going to give it a thorough test for us.  ;D

Though at least labour will be cheap as the cylinders don't need much moving to get access... and yeah, surely when it does die it fails nice and not explosionee!
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Offline TomL

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Re: Goodbye to the Big K
« Reply #29 on: November 15, 2019, 04:14:42 pm »
Ah!

To paraphrase the presenter below, '...it's like the love child of a camshaft and a gearbox'!

Good explanation here, with swearing in (mostly) the right places:
https://www.youtube.com/watch?v=Z0tYMiAnQfU

A motor under each cam cover? Crazy....
The explanation was okay until he started to say how they should have designed it.
As I have grown older, I've learned that pleasing everybody is impossible, but pissing everyone off is a piece of cake.