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W126Club.nl • Knal en mijn middendemper spatte open? : Techniek
Pagina 1 van 1

Knal en mijn middendemper spatte open?

BerichtGeplaatst: 28 sep 2016, 23:55
door Jean Pierre
Hoi iedereen,

Daarstraks trok mijn 280SE op gas niet meer en ging kwakkelig draaien, knop om en op benzine hij trok even door en toen hield hij weer in (alsof ik een paar bougie's stuk had?) en dan .... KNAL ! en de middendemper aan stukken !!! :blush:

Het is géén backfire geweest.
De dop van de radiator lag er af en het water was weg?

Na een 10tal minuten kon ik gewoon starten, rijden, op gas en benzine???
Geen nare reuk of bijgeluiden.
Normaal stationair toerental
Wel een kabaal van jewelste maar buiten dat alles ok ?

- Wat denken jullie? - kan de uitlaat verstopt geraken en dan knallen? (erg oude opgelapte!)
- of de onsteking met ophoping van brandstof in de uitlaat?

Zal morgen foto's plaatsen

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 29 sep 2016, 07:17
door 126
Die ontploffing kan alleen gebeuren door een ophoping van brandstof in je demper.Denk in eerste instantie aan benzine.
Gas zal sneller de uitlaat verlaten samen met uitlaatgas .

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 29 sep 2016, 07:29
door Douwe
Ik vind de combinatie met geen koelwater en een ontplofte demper wel heel vreemd.
Dat de uitlaat door verstopping kan exploderen dat heb ik al eens eerder mee gemaakt.
En dat was een prachtige nieuwe demper.
Maar geen koel water en een motor die net daar voor slecht wou trekken en klinkt alsof hij op minder cilinders liep.
Dat klinkt als een warm loper.
Alleen kan ik dan die ontplofte demper niet verklaren.
Ik vermoed dat het andersom was.
Door een verstopte demper een slechte doorspoelen van de cilinder en hier door een slechte ontbranding .
Waardoor je dus een verschrikkelijk rijk mengsel krijgt in de uitlaat.met een mogelijke explosie tot gevolg
En een hete motor door de slechte doorspoelen kan resulteren dat hij hier door aan de kook raakt waardoor je dop er is afgeknapt en het koelwater er is uit gekookt.

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 29 sep 2016, 19:57
door Jean Pierre
Demper vervangen - koelvloeistof bijgevuld -
Testrit onder verschillende omstandigheden - snel optrekken - rustig - autoweg 120 - binnenwegen...
Dikke 50km gereden alles prima?
Toerental, geluid, koelvloeistof blijft op pijl - trekt normaal op...
Mijn vermoeden = verstopte demper met alle gevolgen van dien !

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 29 sep 2016, 20:00
door Douwe
Dan mag je heel gelukkig zijn dat het zo is afgelopen.
Het had ook heel anders kunnen aflopen :handgestures-thumbup:
Ik ben blij voor je dat het is opgelost

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 29 sep 2016, 20:10
door Jean Pierre
Mercikez, ben zeker blij dat het zo afgelopen is ! groetjes iedereen. :grin:

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 29 sep 2016, 21:41
door Leeflang
Wauw, dat was wel een serieuze knal.

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 29 sep 2016, 22:00
door Douwe
Je kan gerust stellen een dreun.
In de tijd gebeurde bij mij een soort gelijke explosie met een splinternieuwe demper in de garage van 4 bij 8.
Mijn oren hebben aardig lang na gepiept

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 29 sep 2016, 23:19
door Jean Pierre
@Douwe,
Dat is een serieuze prijzenslag geweest dan of had je die nog kunnen herstellen?

Re: Knal en mijn middendemper spatte open?

BerichtGeplaatst: 30 sep 2016, 06:23
door Douwe
Ik had geluk bij mij was de velsnaad open gescheurd.
Dus die kon redelijk eenvoudig weer dicht gemaakt worden.
Bij mij had de explosie ook een andere oorzaak.
En het was bij een W123 coupe.
Ik had het lucht filter daar af gehad en bij de montage in mijn onwetend heid een slang van het inlaatspruitstuk gedrukt.
Daarna wou de motor een dag later niet meer aan slaan.
Niet wetend wat het probleem was en wel elke keer proberen te starten.
Was de uitlaat gevuld met allemaal onverbrand brandstof zo wel benzine als LPG.
Met uiteindelijk een explosie tot gevolg.