The facts.
| Part number | G9118 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Spark weight | 0.2 kg |
| Dimensions | 45°, Ø 28 × 1.5 mm |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Bended tube 45° - d.28 x 1,5mm |
DescriptionThe whole story▼
Forty-five degrees at twenty-eight millimetres. The smallest sharp corner in Spark's range, in the only small diameter it builds with a heavy wall.
Key Features
- Mandrel-formed 45° bend, AISI 304 stainless steel.
- Ø 28 mm outside, 1.5 mm wall thickness.
- Straight tangents at both ends for cutting and welding.
- Matches Spark's 28 mm straight tube, article G9010.
- Spark part number G9118, made in Mantova, Italy.
Forty-Five Is the Working Angle
Of the three angles Spark stocks, forty-five is the one most systems are actually built from. It turns a corner properly without the flow penalty of a right angle, and two of them make a ninety with an offset built in — which is what most real routing problems need.
A shallow bend corrects. A right angle turns. Forty-five does both, which is why a fabricator's rack holds more of them than anything else.
Small Bore, Tight Spaces
Twenty-eight millimetres exists for the plumbing around the main gas path: balance pipes between headers, drain and breather runs, link sections on a 125 or a small single. Those are all jobs done in confined space, where a sharper angle is what fits.
Why the Wall Is Heavier Here
A tube's resistance to collapsing under a bender falls away rapidly as diameter drops. At twenty-eight millimetres a one millimetre wall crushes on the inner heel; a millimetre and a half survives it.
That extra half millimetre is also why this is the one small article in the range that shrugs off being stood on in a workshop.
Two Bends, One Right Angle
Weld two 45° bends together with a short straight between them and you have a ninety degree turn that is also offset sideways. Vary the length of the straight and the offset changes with it.
It flows better than a single tight ninety and it fits around obstacles a single bend cannot dodge. The cost is one extra joint.
Cutting to a Smaller Angle
A 45° bend trims down to anything shallower. Cut through the curve rather than the tangent and both halves stay usable — on a build needing several small corrections that is two parts from one article.
Deburring a Small Bore
At twenty-eight millimetres a burr left on the inside edge occupies a meaningful fraction of the bore. A round file reaches it; a rolled-up strip of abrasive on a rod finishes it. Check with a fingernail before welding, because afterwards you cannot.
Ordering
One bend per article. Spark builds 30°, 45° and 90° at this diameter.
FitmentWhich bikes this fits▼
Universal product — Please check whether it fits your bike.
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