BMW k1200rs or other bike engines

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Re: BMW k1200rs or other bike engines

Postby Duncan » Thu Mar 16, 2017 8:26 am

Hurtzberg wrote:I would like a faster A35.

If Peter Brock could get an A30 going faster (well quite a bit faster) between 1967 & 1970, I'm sure we can do similar if not better in 2017. I quite like the saying "there's no substitute for cubic inches" :whistle:
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Re: BMW k1200rs or other bike engines

Postby Dave Clark » Thu Mar 16, 2017 10:19 pm

Measuring the engine and box in my car is more difficult because of the supercharger installation but there will,definitely be no height problem, as Steven says.

The gearbox is quite compact so it is unlikely to need much in the way of trans tunnel mods other than the hole for the gear lever.Certainly no more than for a Type 9.

It will be necessary to do quite a bit of hacking to allow for the engines width, allowing for manifolds, especially the induction side.

The weight penalty may be significant, but , with suitable suspension mods it need not be a big problem on a road going car -racing is different - in many ways.

MX5 and RX8 boxes have the same bell housing arrangement and I strongly suspect that they are very similar in other ways, perhaps even identical, at least dimensionally. Ratios might be another matter.
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Re: BMW k1200rs or other bike engines

Postby Big Daddy » Thu Mar 16, 2017 11:38 pm

Duncan wrote:I quite like the saying "there's no substitute for cubic inches" :whistle:

Never has a truer word been spoken... :thumbs:
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Re: BMW k1200rs or other bike engines

Postby Big Daddy » Thu Mar 16, 2017 11:46 pm

Dave Clark wrote:The weight penalty may be significant, but , with suitable suspension mods it need not be a big problem on a road going car -racing is different - in many ways.

On a fast road car, good dynamics are still very important. That's why manufacturers such Lotus, Aston Martin and even Mazda (with MX5) strive for balanced weight distribution. A35 has intrinsic disadvantage of engine position spanning front axle centre-line (unlike MG Midget which is behind). Making matters worse by installing an even heavier engine is not a good idea.
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Re: BMW k1200rs or other bike engines

Postby Hoppend » Fri Mar 17, 2017 7:54 am

On a side note, all this talk about engine and hacking to make a bigger one fit. Did you see the latest Furze video:

https://youtu.be/tEQopnaHipo
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Re: BMW k1200rs or other bike engines

Postby Hurtzberg » Fri Mar 17, 2017 10:26 am

I love the projects that Colin Furze does.

From what I've read, A series engine weighs ~ 245 lbs. Mx5 engine weighs ~ 265lbs is that a big enough difference to care about?

Mx5 gearbox - It was my understanding that the mk1 and mk2 gearboxes are very different to the mk3 gearbox.

In the mk3, the engine is closely related to the Duratec. The width of the bellhousing is a fair bit wider than the mk1 and 2. The gearbox from an RX8 bolts straight onto duratec too, I believe (But check before buying one!!)

So in a A35, the mk1 or 2 gearbox would fit much easier as Dave said. I have a vague memory that Dave's is a mk2.
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Re: BMW k1200rs or other bike engines

Postby Countryboy » Fri Mar 17, 2017 11:35 am

Hoppend wrote:On a side note, all this talk about engine and hacking to make a bigger one fit. Did you see the latest Furze video:

https://youtu.be/tEQopnaHipo


That looked like a perfectly good motor cycle / carpet

I feel for this guys neighbours ! :lol:
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Re: BMW k1200rs or other bike engines

Postby Big Daddy » Fri Mar 17, 2017 11:39 am

Hurtzberg wrote:I love the projects that Colin Furze does.

:iagree: Amazingly talented guy... :thumbs:


Hurtzberg wrote:From what I've read, A series engine weighs ~ 245 lbs. Mx5 engine weighs ~ 265lbs is that a big enough difference to care about?

Yes because you are making an existing problem worse, but you could get away with it. Illustrates just how heavy an A-series really is... :whistle:

Be careful with quoted engine weights - it's a minefield because ancillaries can be included or omitted. Just found a figure for Duratec 2.0L of 92.8kg* but that's without clutch or alternator. Duratec 2.3L will not be much heavier.

* 92.8kg = 205lb which is 40lb lighter than an A-series (ref Hurtzberg) at 2.0L capacity... :thumbs:
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Re: BMW k1200rs or other bike engines

Postby Big Daddy » Fri Mar 17, 2017 11:45 am

Countryboy wrote:I feel for this guys neighbours ! :lol:

colin furze.jpg
colin furze.jpg (44.96 KiB) Viewed 165 times


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Re: BMW k1200rs or other bike engines

Postby Big Daddy » Sat Apr 08, 2017 1:15 pm

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Re: BMW k1200rs or other bike engines

Postby Hoppend » Sun Apr 09, 2017 5:50 am

Would have thought that it would go a bit faster... mind you, I would be terrified at that speed in a dodgem.
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Re: BMW k1200rs or other bike engines

Postby Big Daddy » Sun Apr 09, 2017 9:43 am

Hoppend wrote:Would have thought that it would go a bit faster...


I thought 107 mph (not km/h) was fairly impressive for a dodgem... :thumbs:
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Re: BMW k1200rs or other bike engines

Postby Dave Clark » Sun Apr 09, 2017 10:16 am

And a pretty impressive speed in shirt sleeves too !
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Re: BMW k1200rs or other bike engines

Postby Big Daddy » Sun Apr 09, 2017 10:56 am

And without a crash helmet :!: Hope Colin Furze doesn't come to a sticky end... :whistle:
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BMW k1200rs or other bike engines

Postby Hoppend » Mon Apr 10, 2017 5:40 pm

I did the actual conversion just now... faster than I thought it was... oops
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