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Om glæden ved en 90 graders v-twin
Skrevet af den legendariske engelske guzzi-mekaniker Pete Roper:
There are a swag of reasons why no two different engine designs will *feel* or behave the same. there are no simple explanations, sorry. The main reason why a 90 degree motor like a Guzzi and a flat twin like a BMW feel so different and sound so different is simply the firing interval. Being a 4 stroke engine means that you only get one power stroke every 720 degrees of crank rotation, (Two spins.). With a flat twin the pistons don't share a common crank pin, they are either *out* together or *in* together. Each time the pistons reach TDC one cylinder will fire giving a power stroke while the other is at the end of the exhaust, beginning of the induction stroke. So every 360 degrees of rotation you get a power stroke, hence the even, flat, boring, noise and very even power delivery of a flat twin at anything above very low RPM.
With a 90 degree twin like a Guzzi where the rods move on a shared crank pin when one piston is at TDC the other one will be somewhere else in the stroke, (Not, incidentally, half way down the bore as you might imagine!). But what this means is that the firing intervals are unevenly spaced. Now the crank rotates clockwise as viewed from the front and what happens is that if the right hand cylinder, (As viewed.) fires then the crank will turn through 270 degrees, (360 minus 90) before the left cylinder fires. After this though the crank has to turn through 450 degrees, (360 plus 90) before the right cylinder once again comes to the point in it's cycle where it fires.
It is this irregularity of the firing that gives a 90* twin it's lilting cadence and it's somewhat more *lumpy* power delivery at lower RPM as you get a 'Bang-Bang', pause, 'Bang-Bang' rather than the farting parson BMW racket.
If you want to go into engine characteristics more deeply you have to start looking at bore/stroke, rod/stroke ratios, rod lengths, cams and cam profiles, valve operating mechanisms and a whole host of other stuff that is not only fairly complicated but is also, essentially, shit-boring unless you want to actually design and build your own motor.
Look, at the end of the day just accept that a BMW twin is about as exciting a being whipped with a wet lettuce whereas 90 * twins feel good and sound wonderful!
BMW vs. Guzzi
Forklaret af den udødelige guzzi-mekaniker Pete Roper:
Norbert Noguz wrote:
MG will follow BMW along in motor development, as they have since the 60's.
Gag! Splutter!!!! Wash your mouth out with soap! Guzzi have NEVER EVER followed BMW, if anything the opposite is true! The problem is that the boxheads still haven't learnt the lessons they need to, they still build a cheap, crappy gearbox, weedy frames and stupid, fracture prone seat supports. I will give them respect for addopting a weird front fork which is a sort of half-arsed attempt at getting rid of telescopic forks, (Which are an abbomination!) but to say that Guzzi ever *followed* BMW is plain stupid, they are as different as chalk and cheese. BMW's have always, (well since the early '70's) been cheap-shit built down to a price horrors. Up until quite recently Guzzis have been over-engineered and built to last!
Italiensk for begyndere
Jep, Crash går lidt stille med det, men det her er i virkeligheden, hvad han går og drømmer om...
Læg også mærke til Low Fuel, der står og kigger op for at se, hvornår den due, han har stun-talked, falder ned...
Grundigt forklaret af den herostratiske engelske guzzi-mekaniker Pete Roper:
Oh dear. Ducati? Superb? What with clutch baskets that are a 'Consumable' ridiculously short belt change intervals and servicing costs that would cripple the ecconomy of most third world nations! Gimme a break All products have problems from time to time, motorbikes, from any manufacturer, are no exception.
I certainly don't think Guzzi's slate is particularly clean, they ahev over the last decade or so let some really poorly produced crap out of the factory but I can asure you some of the problems with the Japanese manufacturers would have you pooping your dacks if you heard about 'em.
Og et relevant spørgsmål:
Why any sane factory should persist with desmodromic valve gear and its onerus maintenance regime when modern valve springs allow sky-high revs anyway, is well beyond my understanding. At least Guzzi's low-tech approach makes the bikes largely bullet-proof and pretty easy for average mortals to maintain.
Heldigvis kan Pete Roper også svare på det:
They persist with it because it's the Ducati *trade mark* and allows them to continue to sell their preposterous poorly made and over-engineered shitheaps for much more than the opposition!
I know that Ducati have a certain *allure* I also think that on looks alone the 916 is one of the most drop-dead gorgeous looking motorbikes of all time, that doesn't mean that as an every-day proposition, or even as a performance toy, they are a brilliant motorbike. The Otto-Valvole models are, IMHO, horrible and have a raft of nasty QC and design issues that render them irrelevant as a *real* or everyday vehicle.
Now if you're cashed up to the max and need to have some sort of 'This Years Model' (for whatever purpose?) and can afford to pay absurd bills for maintenance, if you live in the well serviced parts of the 'First World' and consider riding a motorbike as simply an adjunct to your slick and sophisticated *lifestyle* then I can see the attraction of something like a Ducati, especially if whenever it needs anything doing you take it to a 'Little Man' who will fix your problems and accept being patronized in exchange for cash. I don't live in that world, I live in a small rural community in the back of beyond at the arse end of the earth. There are prescious few Otto Valvoles in my neck of the woods, (even though there is a bloody good Duke specialist in Canberra 50Km away.) For why? because most of us out here in the sticks ain't that rich, we value the fact that we own bikes that we can do the vast majority of the work on ourselves and if little things, (Like exhaust brackets!) break, we fix 'em and get on with life. You'll find the same attitude in places like NZ and many parts of the USA, it's not a matter of accepting 'Second best' it's about using the correct tool for the job. For my, and many other peoples' purposes the tool that fits the job is a Guzzi, not because it's fast, or high tech or the *best*, (Quantify *best* please?) but because it does everything we want. I think the Griso is one of the most individual and horny looking bikes to have been sold in the last 20 years, but looks are secondaty to me, they are the icing on the cake. The reason I bought one is because I know that it will be fundamentally well engineered, robust, will likely last out my lifetime and it can be mended with a lump hammer, some barbed wire and a couple of cable-ties.
Even the FI isn't very hard! I accepted that if I was going to work on it I'd need the tools, the Axone cost me $3,500 or thereabouts but it comes with factory back up and I can use it on a host of bikes. If you use the Technoresearch gear that John uses I'm sure the cost is a lot lower, (?John?) but that still would be a cost that would be negligible compared to three *major* services on an 'Otto-Valvole'! If a small bracket breaks on my Griso? I'll fix it! It's not an issue to me. If it's an issue to anyone else that's fine, but I guess I'll still be riding my Griso, in the same way I still ride my other 20 year old bits of shit now, in 20 years time and the amount of the worlds limited resources I use, the amount of my own personal *wealth* I spend and the amount of heartache I experience will, I will gaurantee, be less than that of the owners who chop and change their machines as soon as the magazines tell them what they are riding is old hat!
That's me, I don't expect everybody else to work on the same principles as me, good God the world would be a boring place if we were all the same, but chucking a huge hissy-fit and badmouthing a good product simply because of a couple of dodgy welds strikes me as being the reaction of a spoilt, childish brat. YOMV.