The facts.
| Part number | G9102 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | 45°, Ø 40 × 1.0 mm |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Bended tube 45° - d.40 x 1,0mm |
DescriptionThe whole story▼
Fünfundvierzig Grad bei vierzig Millimetern. Wenn ein Aufbauer genau einen Auspuffbogen besitzt, ist es statistisch dieser.
Key Features
- Dorngeformter 45°-Bogen, Edelstahl AISI 304.
- Ø 40 mm außen, 1,0 mm Wandstärke.
- Gerade Enden an beiden Seiten.
- Passt zu Sparks 40-mm-Geraderohr, Artikel G9001.
- Spark-Artikelnummer G9102, gefertigt in Mantova, Italien.
Mit einem rechten Winkel kombinieren
Ein 90°-Bogen ab Sammler, gefolgt von einem Fünfundvierziger in die Dämpferposition, ist die Standard-Zweibogen-Strecke und deckt einen erstaunlichen Teil aller Eigenbauten ab. Der Neunziger dreht dort, wo der Platz am knappsten ist; alles danach richtet aus.
Ein gerades Stück dazwischen macht aus zwei festen Winkeln eine verstellbare Geometrie: verlängern, und der Schalldämpfer wandert nach hinten; kürzen, und das ganze Heck rückt ein.
Mit der Säge halbieren
Fünfundvierzig ist der Winkel, den man auf Lager legt, weil er sich reduzieren lässt. Halbiert ergibt er zweiundzwanzig Grad, um ein Drittel gekürzt dreißig. Umgekehrt geht es nicht — das Argument dafür, im Zweifel den größeren Winkel zu kaufen.
Nehmen Sie die Länge aus der Krümmung, nicht vom geraden Ende: Das gerade Ende ist es, woran Sie spannen und schweißen.
Was ohne Dorn schiefgeht
Die innere Ferse faltet. Eine Quetschbiegemaschine presst das Rohr in einen Winkel, ohne es von innen zu stützen, und bei vierzig Millimetern in einem Millimeter Wand knickt das Material, statt sich zu strecken. Ergebnis: eine Falte, eine kleinere Bohrung genau dort, wo das Gas drehen muss, und ein Teil, das sich nicht geraderichten lässt.
Unrundheit nach dem Umformen
Auch ein guter Bogen ist am Übergang leicht oval. Für eine Stumpfnaht spielt das selten eine Rolle, für eine enge Steckverbindung oft. Zwei Messschieberwerte im rechten Winkel zueinander dauern zehn Sekunden und retten eine Verbindung, die sonst nicht zusammengeht.
Reserve
Kaufen Sie mehr, als die Zeichnung sagt. Anpassen verbraucht das gerade Ende, ein falsch verdrehter Bogen ist meist Ausschuss, und der Unterschied zwischen einem fertigen Wochenende und einer Woche Warten ist ein Ersatzbogen im Regal.
Bestellen
Ein Bogen je Artikel. Spark baut 30°, 45° und 90° in diesem Durchmesser.
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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