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Porsche 917

Uploaded by: lovegt40
Video Description:
Incredible video of the greatest Porsche of every time. Dedicated to Graham, Fran and all the www.gt40s.com :)

Tags for this video: 917 gulf lemans Porsche

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No, you're wrong! A ... ( 2 months ago by lolle18)

No, you're wrong! A boxer engine has a crankshaft with 1 exclusive crankpin for every con rod. The crankpins of 2 opposed pistons are shifted by 180 degrees, this means, the 2 pistons move in opposite directions - the 911 has such an engine. In a flat 12 engine like in the 917 or in all Ferrari "Boxers", including the Testarossa (in fact, these Ferrari engines aren't boxers!), 2 opposing pistons share THE SAME crankpin, just like in every V-engine - both pistons move into the same direction.

You should read the ... ( 2 months ago by lolle18)

You should read the Wikipedia articles on "Flat engine" and "Flat 12" to understand the topic. A flat engine isn't automatically a boxer engine.

the boxers, ie bmw ... ( 2 months ago by sensinyou)

the boxers, ie bmw motorcycles, use that two crankpin setup,because they would fly apart...but my guzzi uses only one crankpin, and its a lot torquier than a boxer,, but seriously, 917 is approaching 40, and FIA could see even then that the big engined cars were beyond the then current technology to keep them safe and remotely affordable to race.

Nice, but what's ... ( 2 months ago by lolle18)

Nice, but what's got your Guzzi to do with the topic? If it uses one crankpin for two opposing pistons and has 180° between the left and right cylinder, then it's not a boxer engine. But as far as i know Guzzi uses 90° V-engines, right?

hmm i think my ... ( 2 months ago by sensinyou)

hmm i think my original question was whether the flat 6s are related to the flat 12s, apparently they are, and its a a valid question. secondly, i find that net/wikipedia spouting car folks know less than they think, it's just the internet, kid, get over yourself. ive actually seen a 917 run, have you?

A boxer, no matter ... ( 2 months ago by lolle18)

A boxer, no matter how many cylinders it got, looks the same as a flat or 180° V-engine, when looked at it from external. That's the only similarity and relation. The internals are totally different - crankshaft, ignition order, oscillation behavior, mass-forces.
The description in the mentioned Wikipedia texts is right (get any book on engine construction you can get and proof me wrong); i'm engineer and studied this stuff long enough.
Plus, having seen a 917 doesn't qualify as
Having seen

an expert. I've ... ( 2 months ago by lolle18)

an expert. I've seen several 917s too, and driven a couple of 911 and Ferraris - now, does this make me an expert in something?

Hi Sensinyou, the ... ( 2 months ago by gcmc2)

Hi Sensinyou, the 917 engine is related to the 911 engine sort of once removed. Forerunner to the 917 was the 908/909 series which used a flat 8. It was effectively an extended 911 in magneseum. The 917 was a new block design with a 2 piece crank. In original 4.5 ltr from it also used the 911 piston/rod. Once the 917 engine had been expanded to 4.9/ 5.0 ltr there was no physical link to the 911 The lineage in design is still there.
The flat 6 engine then returned in the 936, 956 & 962

lolle18 does offer ... ( 2 months ago by gcmc2)

lolle18 does offer the correct definition of a boxer engine. It is also true to say that many engines are mistakenly referred to as boxers. Ferrari for instance as I think has been said, never made a boxer engine for a road car. They used boxer engines only in racing. They key to a true boxer is that the crankjournals are all in one plane and so referred to as flat plane or single plane crank. If you remove the crank and sit it on the bench all Journals (main and rod) lie flat on the bench.

So, in a true boxer ... ( 2 months ago by gcmc2)

So, in a true boxer at TDC/BDC, all crank journal centres AND cylinder bore centres are in the same plane.
The boxer term relates to the pugilist but is also misunderstood. Some think it represents two boxers facing each other and making sort of reciprical punching movements. It actually compares the movement of just the 2 pistons of 2 opposing cylinders to the the habit of 1 boxer punching his two gloves together often seen prior to start of a bout in a sort of "priming" ritual.

Array ( 2 months ago by metalJBC)

Awesome!
I can't believe this beast has an air cooled engine x_X

Yes, metalJBC, ... ( 2 months ago by gcmc2)

Yes, metalJBC, neither did Enzo Ferrari believe it could work but he found out otherwise the hard way !

The 5.374 litre 12 ... ( 1 month ago by baaaaaoneaaaaah)

The 5.374 litre 12 cylinder (90.0 x 70.4 mm) twin-turbocharged engine could produce 1,560 bhp (1,160 kW) with twin turbochargers run up to full boost, a simply astonishing 39 psi, though it usually raced with around 1,100 bhp (820 kW) at 7,800 rpm to preserve the engine. The 917/30 dominated the Can-Am series during the 1973 season. The 917/30 could go from 0-60 mph (97 km/h) in 1.9 seconds, 0-100 mph (160 km/h) in 3.9 seconds, 0-200 mph (320 km/h) in 10.9 seconds, and on to a top speed of257mph

hmmmmmm way too ... ( 1 month ago by doctorshivargo)

hmmmmmm way too much chin stroking in these messages. Can we just sit back and enjoy the view, and that SOUND! nice!

yahoo news voted ... ( 1 month ago by adispleh)

yahoo news voted this car the 3rd ugliest car ever made hahaha

poor .... really ... ( 1 month ago by JesseAronGaron)

poor .... really poor
Think yahoo news staff got more competence in computers and all the stuff around. Cars like that are not made that freaks give comments on it.

Awesome vid, thanks ... ( 1 month ago by kloppiej)

Awesome vid, thanks for sharing !!

Racecars aren't ... ( 1 month ago by TheLordofShell)

Racecars aren't made to be pretty.

true ( 3 weeks ago by adispleh)

true

Really?? Dickheads. ... ( 3 weeks ago by claudio917K)

Really?? Dickheads...

Yes you could say ... ( 3 weeks ago by WBD86)

Yes you could say that. Those are designed with pure innovation and performance

Thank you so much ... ( 3 weeks ago by jonbotdotcom)

Thank you so much for uploading that video, really a treat to watch!

Brilliant video! ... ( 1 week ago by 3000ST1)

Brilliant video! Enjoyed watching that, when I see a 917 in Gulf colours I'm always reminded of Steve McQueen.

Yeah 3000ST1 it ... ( 1 week ago by vatraljski)

Yeah 3000ST1 it reminds me on Steve McQueen too!Downloading the le mans right now...