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Pašreiz BMWPower skatās 102 viesi un 10 reģistrēti lietotāji.
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Tēma: E39 M5
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Speed3  | |  Kopš: 04. Jun 2002
No: Rīga
Ziņojumi: 12719
Braucu ar: a/m BMW
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2005-12-20 18:36, edzulis rakstīja:
Šī džeka postus var laist garām ausīm 
Varbuut vispaar mani izbano.
Paldies! Varbuut sapratiisi.
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IHTIS |  Offline | | |
SEMIGALL  | |  Kopš: 10. Apr 2005
No: Rīga
Ziņojumi: 4693
Braucu ar: 3.2DID
| Vai kads gadijuma nevaretu iemest linku,ja nu ir atrasta detalizetaka informacija par M62 Nicasil cilindru parklajumiem to ipatnibam,tehniskajiem + un - un tt. | | Offline | | |
| SEMIGALL | | Kopš: 10. Apr 2005
No: Rīga
Ziņojumi: 4693
Braucu ar: 3.2DID
| Parakstijos S62  | | Offline | | |
| PERFS | |  Kopš: 13. May 2002
No: Rīga
Ziņojumi: 13608
Braucu ar: 21/43
| S62 vaitad nebija AluSil paarklaajums? Hmm. | | Offline | | |
| SEMIGALL | | Kopš: 10. Apr 2005
No: Rīga
Ziņojumi: 4693
Braucu ar: 3.2DID
| AluSil var but tapec ar jautaju kaut ka aizmirsies | | Offline | | |
| PERFS | | Kopš: 13. May 2002
No: Rīga
Ziņojumi: 13608
Braucu ar: 21/43
| ...lai kaa arii tur nebuutu, Aluil vs. Nikasil ir izdiskuteets krustaam shkjeesaam gan sheit, gan aarzemju forumos - google it.
Mazliet info -
The BMW M60 V-8 and BMW M52 6-cylinder engines (the M52 Nikasil engine never went to the USA) with Nikasil cylinder bore linings are particularly vulnerable to fuel (gasoline or petrol) with a high sulfur content.
The sulfur in the fuel breaks up the Nikasil lining in the cylinders, thus causing a loss of compression. Once the lining is damaged, excessive bore wear of the soft, underlying alloy occurs very quickly. Some Nikasil engines have failed in as little as 30,000 miles. And the effect is cumulative, so if the engine has ever been run on high sulfur fuel, the damage may already have been done and premature bore wear may result.
Some symptoms of the Nikasil problem are rough running at idle and difficult cold starting, both due to loss of compression. In severe cases, the loss of compression is so bad that the engine loses power. Oil consumption increases dramatically as oil is sucked up the side of the leaky pistons. In extreme cases, the compression decrease is so severe the car will not start in cold weather, especially M52 6-cylinder engines.
Over the years, BMW has provided replacements with steel, cast-iron or Alusil lined engines, at considerable cost to the manufacturer. Often, disgruntled owners have borne the brunt of these replacement costs, and prospective buyers are at risk, too.
[..]
So why is there a problem? BMW reportedly did not discover the problem with Nikasil in their original testing because they used only high-quality fuel. Sulfur should be extracted from fuel before it is used, but since it is a costly process, oil companies may not remove as much as they should. Once BMW was aware of the Nikasil crisis, BMW replaced the cylinder blocks and also tried to ameliorate the problem by re-programming the DME to ensure higher combustion temperatures. | | Offline | | |
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