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PostPosted: Thu 25. Sep 2003 12:31 
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Formúlubílstjóri

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Rakst á þetta á M5 spjallrásina hjá yahoogroups. Nokkuð ítarlegar upplýsingar:

Facts and figures on BMW's P83 F1 engine

It packs more than 900 bhp, weighs less than 90 kilograms and has a
maximum engine speed of 19,200 rpm. The BMW P83 engine with which the
BMW WilliamsF1 Team is pitching for the 2003 Formula One World
Championship title will be put out to pasture after the final race –
the Japanese Grand Prix – in three weeks' time.

Up to now, no more than broad skeleton data on this power pack from
the Munich Formula One factory have been released. Ahead of the last
two races of the season in Indianapolis (28 September) and Suzuka (12
October), its profile is now fleshed out.

Who would have guessed, for example, that 1,950 CAD drawings were
made for this engine? Printed out and laid end to end, they would
cover a distance of 1.3 kilometres.

Facts and figures:
• Output of the BMW P83 is over 900 bhp.
• Maximum engine speed is 19,200 rpm.
• In a race, engine speed is limited to 19,000 rpm.
• Idle speed is 4,000 rpm.
• The engine weighs less than 90 kilograms.
• It completes a distance of 500 kilometres before undergoing
revision.
• Total production of the BMW P83 is 200 units, ten of which the
team takes to each race.

• Before being phased out the engine will have received 1,388
upgrade modifications.
• It comprises around 5,000 individual components, 1,000 of them
different.
• The air intake volume is 1,995 cubic metres per hour.
• Maximum piston acceleration is 10,000g.
• Piston speed peaks at 40 metres per second and averages 25 metres
per second.
• Exhaust temperatures of up to 950 degrees are reached.
• Maximum air temperature in the pneumatic system is 250 degrees.
• The ultra-high-speed 130R turn at Suzuka with its lateral load of
4g poses the greatest challenge to the oil system.
• The BMW P83 endured the highest full-throttle proportion on the
Monza circuit at 73 per cent per lap.
• At the Monaco Grand Prix, the transmission and engine have to
withstand an average 3,100 gear changes.
• The engine block and cylinder head are made of cast aluminium and
are manufactured at the BMW Formula One foundry in Landshut using a
special thin-wall casting method.
• BMW Munich handles, among other things the manufacture of the
crankshaft (steel), camshaft (case-hardened steel) and camshaft
covers, as well as processing of the cylinder head and crankcase. The
oil system and engine electronics also stem from BMW Munich.

BMW 83 engine timeline from concept to culmination:
• Concept: November and December 2001
• Design: January through May 2002
• Model construction at the BMW foundry in Landshut: March through
May 2002
• Components manufacture: April through July 2002
• Initial assembly: July 2002
• First bench test: 31 July 2002
• Test phase development stage 1: August 2002 through January 2003
• First deployment in car: 18 September 2002
• Development to race readiness: October 2002 to mid-February 2003
• Further development: mid-February to season's final in October 2003

In the meantime the test phase for the BMW P84 engine was launched.
Following successful bench tests, it was already being tested on the
track in its 2004 season specification at Monza on 4 September 2003.

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PostPosted: Thu 25. Sep 2003 12:57 
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Meðlimur Meðlimur
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Snilld! :clap:

Ef 500km ending og 4000rpm idle væri my cup of tea væri þetta alveg rakið ofan í E46. ;-)

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PostPosted: Thu 25. Sep 2003 17:25 
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Formúlubílstjóri
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Líka það að þeir eru byrjaðir að þróa nýju vélina


Mínir fara allaveganna
7250 / 60 = 121rpm á sekúndu
85,9mm per slag x 4 = 343,6mm per snúning
343,6mm x 120rpm = 41232mm/sek = 41,232m/sek

Sýnir hvað er hægt að hægja á stimplunum með styttra stroki á háum hraða,

það er með þessu hægt að reikna strokið í vélinni,
19200rpm/60sek = 320rpm/sek
40000mm / 320rpm = 125mm/per snúning / 4 = 31,25mm stroke,

Með þessu er svo hægt að reikna vélarstærð eða mjög nálægt,

stroke = stærð / (pi/4 x bore^2 x stimpla fjöldi)

svo útfærum við þetta aðeins

cyl vol = pi/4 x bore^2 x stroke

(cyl vol / stroke / pi/4) = bore^2

300cc / 31,24 / 0,7853 = bore^2
11mm = bore

Það sést að þessi vél er með alveg klikkað mikið bore miðað við stroke, sem er það sem þarf til að komast í 19200rpm
en aftur á móti kemur að stimpill með 11mm bore og 3,124mm stroke er ekki í góðri stærð, meira stroke og minna bore er betra, þess vegna eru þeir ekkert að snúa þeim meira því að stimplarnir þola það ekki,
það væri hægt að fá miki meira power úr 12cyl 3lítra vél með 3,124 stroke því að stimpil rýmið væri betra

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PostPosted: Thu 25. Sep 2003 17:33 
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Formúlubílstjóri

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Gunni þú ert óþrjótandi viskubrunnur og með endalausar pælingar um allt sem við kemur vélum. HÚRRA fyrir þér...

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PostPosted: Thu 25. Sep 2003 19:54 
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Go-kartbílstjóri
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Gunni: Ekkert bögg í mér, bara 2 hlutir sem ég átta mig ekki á í útreikningunum hjá þér:

1.Af hverju viltu margfalda með 4 til að reikna út færslu stimpilsins per snúning?
2.Hvaðan fékkstu töluna 40000mm ?


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PostPosted: Fri 26. Sep 2003 00:53 
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Formúlubílstjóri
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1: Því að stimpillinn fer 4 sinnum upp og niður per snúning,
1 sog slag
2 þjöppu slag
3 sprengislag
4 afgas slag

Allt gert í hverjum snúning

2: Þetta á eiginlega að vera 40000mm er 40metrar ég fékk það úr textanum um P83 vélina

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PostPosted: Fri 26. Sep 2003 01:37 
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Formúlubílstjóri

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gstuning wrote:
1: Því að stimpillinn fer 4 sinnum upp og niður per snúning,
1 sog slag
2 þjöppu slag
3 sprengislag
4 afgas slag

Mér finnst þetta svolítið eins og þetta gæti misskilist,
en það sem gunni meinar eflaust er að stimpillinn fer fjórum sinnum þessa vegalengd, tvisvar upp og tvisvar niður :)

Ég a.m.k. las þetta einhvernveginn eins og stimpillinn færi 4 x "upp og niður".
Sogar á leið niður, þjappar á leið upp, sprengir á leið niður, og pumpar út afgasi á leið upp.

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PostPosted: Fri 26. Sep 2003 02:41 
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Go-kartbílstjóri
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Glæsilegt, takk fyrir góð svör! Ykkur hefur tekist að kenna mér 4ja þrepa sprengiferlið! :D
Gunni: Ég áttaði mig ekki á niðurstöðunni þinni áður en ég fór yfir útreikningana, í niðurstöðunni er kommuvilla og stendur þar 3,124mm slaglengd.
gstuning wrote:
en aftur á móti kemur að stimpill með 11mm bore og 3,124mm stroke

Fannst frekar erfitt að kyngja því, en áttaði mig þegar ég skoðaði milliskrefin :lol:


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PostPosted: Fri 26. Sep 2003 10:02 
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Formúlubílstjóri
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Já ég sé þetta :)

Bore er 11cm og stroke 3,1245cm

11mm kom af því að ég notaði 3,1245mm í stað cm,
my bad

Árni já þetta var ein ein villan hjá mér :)
Á að vera náttúrulega 4 ferðir 2 niður og 2 upp

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