Want to read Slashdot from your mobile device? Point it at m.slashdot.org and keep reading!

 



Forgot your password?
typodupeerror
×

Comment Re:Golf Diesel (Score 1) 576

I take offence to this. There are plenty of cars both in Europe and the States (and beyond) that are low powered by anyone's definition. The choice is there, and a reasonable statement is that a lower powered car will be cheaper. People can choose these cars if they wish. However, if they don't why does this amount to gross denial - and who are you to dictate someone's requirements to them? It's a perfectly valid argument that a more powerful car makes certain situations safer - this doesn't amount as you say to someone arguing that they can't drive on the freeway.

Also a Euro is a unit of currency, when you call me one it conjures an image of a die-hard republican spouting about commies - except the polar opposite. Although no less ignorant.

Comment Re:How? (Score 1) 317

A certain amount of negative camber is actually beneficial in the situation you describe. As you hit the brakes, the front of the car squats, which compresses the suspension which changes it's geometry. Generally under compression, this geometry change results in positive camber, or the tyres tops pointing outwards. If the tyres were cambered negatively beforehand, under squat the tyres approach a parallel state with the road below (assuming it's level).

Designing suspension geometry is an exercise in compromise. The question here is do you want your tyres parallel with the road under compression or not. Since under compression you're generally in a situation where you're testing the tyre's grip, it seems to me that a degree or 2 of negative camber is actually ideal.

Biotech

First Halophile Potatoes Harvested 117

Razgorov Prikazka writes "A Dutch-based company from Groningen is trying to create a potato race that is able to survive in a saline environment. The first test-batch was just harvested (English translation of Dutch original) on the island Texel and seem to be in good shape. The company states that rising sea-levels will create a demand for halophile crops. I do wonder if one still has to put salt on ones potatoes when they are grown in salt water."

Comment Re:Innovation! (Score 1) 525

Who on earth modded this informative????

A V allows you package more displacement in to smaller overall volume or to have less car to package around given in engine. Weight savings from a V engine boosts handling performance and economy. Yet an inline engine will be cheaper than a V, due to one, block, single manifolds, two camshafts instead of four.

Since a v engine has twice as many heads how can it possibly weigh less or have more displacement for it's size?

V engines don't have the length of an inline engine, and are more cube shaped which tends to suit application to more engine bays.

Difference in power may come from firing order, and the path intake charge and exhaust gas take and a small reduction in friction in a Inline 4 or 6. Inline 6s can have a good cross flow set up for top end power when mounted longitudnally in a front engined car (short straight intake runners and 6 into 1 headers, make a good turbo platform. BMW, Nissan and Toyota have exploited this to great effect in racing and in road cars. Aftermarket Nissan Skyline motors with 6-1 turbo manifolds make whopping power.

I don't think I've ever seen a non-cross-flow v-engine. They're at least as suited to a cross-flow head as an inline engine.

Turbo engines are "suited" to 6-1 manifolds because there's very little advantage in tuning the exhaust of a turbo'd engine. The 6-1 manifold is chosen because of this and because it takes up less space. If pulse tuning was any use on a turbo engine, they'd all be 6-2-1 as in an n/a application you could tune the engine to produce torque as the turbo spools.

I'd also wager that Skylines make whopping power because of the "whopping" turbo.

In the end, V8s rose to greatnews because it was probably the best balance between a number of cylinders, dimensions, displacement etc. A four cylinder block is about as long as you want to go. Big displacement engines need a greater number of pistons to stop the piston speeds getting out of hand along with smoothness reasons. Eight cylinders is just right, for big power or a big engine.

Nonsense, you can counteract piston bore with the stroke of the engine to have whatever speed you wish. Eight cylinders were chosen probably more because this leads to a more suitable ratio between engine dimensions.

A inline 6, and a 90 degree V12 and a boxer six are probably the three ideal engines, having perfect balance. The greatest engine of them all on the balance of all considerations, including, cost, complexity and packaging is the inline four. That's why V8s are made out of two of them:

Wrong again. An inline 6 has primary and secondary harmonic balance - about as good as any engine could hope to have, but not perfect. A boxer 6 does not have this, usually a boxer is chosen for a low centre of gravity/space saving to slap a bunch of turbos on top. A v12 has the same balance as an inline 6 no matter what the angle is, 90 or otherwise. It's a little smoother because of the increase in fires per revolition.

American V8s most often really are just two inline four engines stuck together. Right down to the split-plane (cross-plane) crankshaft. Yes there are hack mechanics who have lopped off one bank of cylinders to make a inline four, it works. Unfortunatley cross-plane crankshafts have a lot of drawbacks including difficult to control vibration, unbalanced piston movement, poorer exhaust scavanging in certain exhaust configuartions and need for counterweights that add rotational inertia. Yes every American V8 you drove had a dirty kludge under the hood.

Inline 4's invariably have flat-plane cranks, so you've got that backwards too. Crossplane crank v8's have secondary balance, which actually means they're better balanced than flatplanes - Maybe you heard that flatplane's rev higher so thought this may be the reason they're better balanced? Not so, the reason for this is because of the lack of need for the large counterweights a crossplane has.

IMHO, a real V8 has a flat plane crankshaft. Truly the correct format for a V8, better firing order, more power, more balance and even better sound :)

Better is subjective, but the burble people love from v8 engines is only present in crossplane cranks. You can have this one though, because of v8 Ferrari's (although we all know the real Fezza engine is a v12).

Comment Re:Of course, there is another solution (Score 1) 721

Speaking as a christian, I absolutely agree with this point of view. I'm not going to disagree that my views are blatantly unscientific and radical, however I will disagree that I may be wrong. I don't say this to be confrontational, condescending or brash, the only reason I say it is to show the distinction (in my reasoning) between my scientific and religious views.

I wouldn't view myself as an unreasonable person, but events in my life and a very real relationship leave me in no doubt that what I believe is true - absolutely true. It's not scientific, but it's logical (to me at least).
Security

Submission + - SPAM: Facebook under fire over privacy settings

ZeeNews writes: "The latest news for all social media lovers is that the Popular social networking site Facebook is being criticised for planned changes to its privacy settings.

The Facebook officials plan to "simplify" the process so users only have to set them once, instead of for each individual feature.

The change will help people share more information with one another.

However, critics insist that the new settings can persuade members to share too many personal details — their date of birth for example.

"I'm a little bit worried about the settings recommended by Facebook because as far as I can see it's actually sharing quite a lot of information with quite a few people," the BBC quoted Tom Royal, from Computeractive magazine as saying.

"That's not something we'd advise people to do. We'd very much recommend people choose the ''limited'' option instead.

"For example, just your date of birth can be a security question for lots of internet applications," he added.

Meanwhile, Facebook execs say that the ''one size fits all'' approach will make things more straightforward for users.

"The effect of more and more settings has made controlling privacy on Facebook too complicated," said site's chief privacy officer Chris Kelly.

"It's also phasing out regional networks like London and Manchester because Kelly says "they don't adequately reflect a world where people choose the audience they want to share with," he added."

Link to Original Source

Slashdot Top Deals

BLISS is ignorance.

Working...