Author Topic: BMW Boxer engine.. (Read 1439 times)

shark_za · « **Reply #20 on:** April 05, 2007, 10:49:42 am »

Thinner casing allows more internal noise to be heard.

Welsh · « **Reply #21 on:** April 05, 2007, 11:01:30 am »

Quote from: "shark_za"

Thinner casing allows more internal noise to be heard.

Quite right, the addition of balance shafts reduces vibration, this allows thinner sections to be used, whilst still having a satisfactory fatigue life. Plus modern casting techniques allow the minimum sections to be achieved more accurately. This means the noises generated on the inside are not damped as much as they pass to the outside through the thinner casings.

Welsh

IceCreamMan · « **Reply #22 on:** April 05, 2007, 11:12:56 am »

Quote from: "African Welsh"

Quote from: "shark_za"
Thinner casing allows more internal noise to be heard.

Quite right, the addition of balance shafts reduces vibration, this allows thinner sections to be used, whilst still having a satisfactory fatigue life. Plus modern casting techniques allow the minimum sections to be achieved more accurately. This means the noises generated on the inside are not damped as much as they pass to the outside through the thinner casings.

Welsh

Excuse my obtuseness here , is that a good thing (from a db level) that this noise escapes from the motor? does this increase or decrease db levels?

Welsh · « **Reply #23 on:** April 05, 2007, 11:41:19 am »

Quote from: "IceCreamMan"

Quote from: "African Welsh"
Quote from: "shark_za"
Thinner casing allows more internal noise to be heard.

Quite right, the addition of balance shafts reduces vibration, this allows thinner sections to be used, whilst still having a satisfactory fatigue life. Plus modern casting techniques allow the minimum sections to be achieved more accurately. This means the noises generated on the inside are not damped as much as they pass to the outside through the thinner casings.

Welsh

Excuse my obtuseness here , is that a good thing (from a db level) that this noise escapes from the motor? does this increase or decrease db levels?

Anybody ever told you that this lateral thinking is the sign of a sick mind, bloody interesting question though.

From a dB perspective I would say that it would depend in which octave band we are discussing and whether we are talking SPL or PWL measurements and at what distance. As at certain octaves the conversion from noise to heat in the transfer through the engine casings is different. In other words no varking idea

Welsh

Never argue with an idiot, they will bring you down to their level and beat you with experience.

Kev · « **Reply #24 on:** April 05, 2007, 11:50:40 am »

Quote from: "African Welsh"

From a dB perspective I would say that it would depend in which octave band we are discussing and whether we are talking SPL or PWL measurements and at what distance. As at certain octaves the conversion from noise to heat in the transfer through the engine casings is different.

Interesting... is there any relation between the noise then, and vibration? If the noise can pass through easier, will it reduce vibration because it does not get trapped?

Quote

In other words no varking idea

:shock: So much for my ponderings then!

lecap · « **Reply #25 on:** April 05, 2007, 12:14:01 pm »

Vibration causes noise - when the bits vibrate off and hit the ground.

Grootseun · « **Reply #26 on:** April 05, 2007, 12:20:28 pm »

Quote from: "lecap"

Vibration causes noise - when the bits vibrate off and hit the ground.

Nope.. that would be the KLR engine.. this is the BMW engine thread...

(oops i may have inadvertently caused another 20 pager..now if only that chimp gets human rights..so it can get finance in order to buy a beemer..)

Lootch67 · « **Reply #27 on:** April 05, 2007, 12:28:28 pm »

I think BMW should go the Moto Guzzi way - V twin mounted sideways. Better ground clearance and you still have the cylinder heads accessible for easy servicing.

I'm sure the Moto Guzzi has problems of it's own but I do think it's a much "sexier" engine than the Boxer.

IDR · « **Reply #28 on:** April 05, 2007, 12:31:58 pm »

Quote from: "Lootch67"

...but I do think it's a much "sexier" engine than the Boxer.

I hope you put the "sexier" in quotes because you were being sarcastic... absolutely NOTHING sexy about a boxer motor... :?

At least not compared to this:

toucan · « **Reply #29 on:** April 05, 2007, 12:46:28 pm »

Quote from: "InsiderDirtRider"

Quote from: "Lootch67"
...but I do think it's a much "sexier" engine than the Boxer.

I hope you put the "sexier" in quotes because you were being sarcastic... absolutely NOTHING sexy about a boxer motor... :?

At least not compared to this:

could be uncomfortable on long rides though...

Welsh · « **Reply #30 on:** April 05, 2007, 12:47:34 pm »

Quote from: "Lootch67"

I think BMW should go the Moto Guzzi way - V twin mounted sideways. Better ground clearance and you still have the cylinder heads accessible for easy servicing.

I'm sure the Moto Guzzi has problems of it's own but I do think it's a much "sexier" engine than the Boxer.

Its like a boxer with a hard on

Welsh

shark_za · « **Reply #31 on:** April 05, 2007, 12:47:48 pm »

IDR, the only way that relates to sex is you will feel raped after riding it.

IDR · « **Reply #32 on:** April 05, 2007, 01:01:31 pm »

ENGINE... ENGINE!!!! sexier ENGINE...

I think I'm going to give up this posting thing today... I'm just getting uphill for it

But OK - here is the complete product:

Purdy enough, I'd say!

And a quote: "As soon as you release the clutch on the new Speed Triple, it is clear that every outing could end with jail time"

tsiklonaut · « **Reply #33 on:** April 05, 2007, 01:44:02 pm »

Quote from: "shark_za"

IDR, the only way that relates to sex is you will feel raped after riding it.

Well sayed Shark!

No inline 3+ cyl engine compares to twins or singles on riding comfort :thumbright:

After ridden over 50,000kms with inline-4 sport bikes and "upgraded" to flat twin, I personally now find hyper revvy inline engines the most useless/unpractical engines on motorcycles, in fact. Or I'm getting old

Stricly made for those guys who seriously need penis-enlargement

tsiklonaut · « **Reply #34 on:** April 05, 2007, 01:57:27 pm »

Quote from: "African Welsh"

Its like a boxer with a hard on

Welsh

Wot Welshie says,

Guzzis cylinders are unnaturally placed, it's like a size 10 tits, but they are using size 5 titholders that put them a way too much up, makes the tits look too small and too "cramped"

The following pictures should demonstrate how the tits reall have to look like, to look naturally good.

This is still the planet Earth's sexiest bike equipped with the World's sexiest engine ever existed in the history of history - the black colured crankcased boxer:

But it still looks the best in RED imho:

Still I wouldn't buy one tho, not practical in our third world conditions

Grootseun · « **Reply #35 on:** April 05, 2007, 02:06:21 pm »

there is seriously something wrong with the men in that second picture.. theyre all looking at the bikes.. :?

I like the idea of the R1200.. but i think the styling of the bike is all wrong..it's very bulky-looking..

saw a guy in the traffic with one the other day..he really struggled..it was a brand new bike, he was coming up the road from lyndhurst auto..i caught him at each corner.. and when lanesplitting..

wouldnt mind to test ride one tho..

Kev · « **Reply #36 on:** April 05, 2007, 02:34:24 pm »

Quote from: "African Welsh"

Quote from: "Lootch67"
I think BMW should go the Moto Guzzi way - V twin mounted sideways. I'm sure the Moto Guzzi has problems of it's own but I do think it's a much "sexier" engine than the Boxer.

Its like a boxer with a hard on

Welsh

Haven't laughed that hard for a long time! Thanks Welshie!

IDR · « **Reply #37 on:** April 05, 2007, 02:37:50 pm »

Quote from: "tsiklonaut"

Quote from: "shark_za"
IDR, the only way that relates to sex is you will feel raped after riding it.

Well sayed Shark!

No inline 3+ cyl engine compares to twins or singles on riding comfort :thumbright:

After ridden over 50,000kms with inline-4 sport bikes and "upgraded" to flat twin, I personally now find hyper revvy inline engines the most useless/unpractical engines on motorcycles, in fact. Or I'm getting old

Stricly made for those guys who seriously need penis-enlargement

Have you ridden a inline 3 though? I know it's always going to be a compromise between twins and fours... but you also get good points from both. I admit - inline 4s are not for me either - even though I own one (I was swindled into the deal, what can I say

), and my current one will be my last. I'll buy another triple any day though!

Welsh · « **Reply #38 on:** April 05, 2007, 02:39:24 pm »

Quote from: "tsiklonaut"

Quote from: "shark_za"
IDR, the only way that relates to sex is you will feel raped after riding it.

Well sayed Shark!

No inline 3+ cyl engine compares to twins or singles on riding comfort :thumbright:

After ridden over 50,000kms with inline-4 sport bikes and "upgraded" to flat twin, I personally now find hyper revvy inline engines the most useless/unpractical engines on motorcycles, in fact. Or I'm getting old

Stricly made for those guys who seriously need penis-enlargement

I got a problem here, I still get that "aroused" feeling when I think of the sound the early Laverda Jota made, with a 3 into one and wrung out, a bit like a Tom Cat with its balls in a Bear Trap.

Welsh :shock: :shock:

IDR · « **Reply #39 on:** April 05, 2007, 02:57:25 pm »

Quote from: "African Welsh"

I got a problem here, I still get that "aroused" feeling when I think of the sound the early Laverda Jota made, with a 3 into one and wrung out, a bit like a Tom Cat with its balls in a Bear Trap.

Welsh :shock: :shock:

Triumph with a good can does the same for me

Author Topic: BMW Boxer engine.. (Read 1439 times)

shark_za

Kev

shark_za

Kev