The facts.
| Part number | G9012 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Dimensions | Ø 48 × 1.0 mm, 500 mm long |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Tube l.500mm - d.48 x 1,0mm |
DescriptionThe whole story▼
Achtundvierzig Millimeter. Jenseits des Punktes, an dem ein Rohr ein Verbindungsrohr ist, und hinein in die Durchmesser für Sammlerabschnitte und die Strecke dahinter.
Key Features
- Gerades Auspuffrohr, Edelstahl AISI 304.
- Ø 48 mm außen, 1,0 mm Wandstärke.
- 500 mm lang.
- Halbzeug, ungeschnitten geliefert.
- Spark-Artikelnummer G9012, gefertigt in Mantova, Italien.
Sammlerbereich
An einem Vierzylinder treffen sich die Krümmerstränge in einem Sammler, und alles danach trägt das Gas von vier Zylindern. Dieser Abschnitt liegt typischerweise zwischen fünfundvierzig und sechzig Millimetern, und achtundvierzig sitzt für einen Mittelklassemotor bequem in diesem Band.
An einem großen Twin funktioniert es als gesamte Strecke ab der Krümmerzusammenführung.
Innen entgraten
Jeder Schnitt hinterlässt an der Innenkante einen Grat, und an einem 48-mm-Rohr sitzt dieser Grat direkt im Gasweg. Er kostet Strömung, sammelt Ruß, und an einer Steckverbindung verhindert er, dass die beiden Teile sauber zusammengehen.
Eine Rundfeile und dreißig Sekunden beheben es. Es ist der Schritt, der am häufigsten ausgelassen wird, und der, der sich später als nicht sitzende Verbindung zeigt.
Wärmebewegung
Edelstahl dehnt sich um etwa siebzehn Mikrometer je Meter und Grad. Über einen halben Meter Rohr von kalt auf fünfhundert Grad sind das mehr als vier Millimeter Zuwachs — deshalb reißt eine Anlage, die an beiden Enden starr verschweißt ist, und deshalb nutzt Spark gefederte Steckverbindungen.
Eine gleitende Verbindung je Strecke einplanen, und das Problem verschwindet.
Unrundheit
Rohr kommt rund an und hört auf, rund zu sein, sobald es hart eingespannt wird. An einem dünnwandigen 48er zählt das an den Verbindungen: Ein ovales Ende geht in keine runde Hülse. Auf einem Dorn oder in einer hölzernen Prismenaufnahme spannen, nicht im Schraubstock.
Schellengrößen
Sparks eigene Schellen sind mit 43,5, 47,5, 53,5 und 63,5 Millimetern gelistet — Größen, die um eine Verbindung schließen und nicht zu einer Nennweite passen. Ein 48er Rohr in einer 52er Hülse sitzt in der 53,5er Schelle; die 47,5er geht direkt um blankes 48-mm-Rohr.
Bögen in dieser Größe
Spark bietet 48 mm als fertigen 30°-, 45°- und 90°-Bogen. Einen 180°-Bogen gibt es in diesem Durchmesser nicht — nur 45 und 50 werden so weit gebogen.
Bestellen
Ein 500-mm-Stück je Artikel, kein Zuschnittservice.
FitmentWhich bikes this fits▼
Universalprodukt — Bitte prüfen Sie, ob es an Ihr Bike passt.
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Measure your head circumference about one centimetre above your eyebrows and compare it with the size chart on this page. Between sizes? Choose the smaller one — the padding beds in with use.
Yes — it’s tested and approved to the current ECE 22.06 standard and road-legal across the EU.
Most of our touring and sport helmets are Pinlock-ready and many include the insert. Check the ‘What’s in the box’ section on this page for this model.
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Take out the washable lining and hand-wash it in lukewarm water. Clean the shell and visor with a soft cloth and water only — never solvents.
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