The facts.
| Part number | SGMA14 |
|---|---|
| Type | Bent pipe |
| Material | AISI 304 stainless steel |
| Dimensions | Ø 60 → Ø 40 mm, 110 mm long |
| Fitment | Universal |
| Road approval | None — track use only |
| Origin | Made in Italy |
| Manufacturer | Spark Exhaust Technology, Mantova |
| Manufacturer description | Conic adapter tube d.60>40 l.110 |
DescriptionThe whole story▼
A hundred and ten millimetres of stainless cone that takes sixty millimetres down to forty. An inexpensive part instead of a fabricated transition.
Key Features
- Conic adapter tube, stainless steel.
- Ø 60 mm at one end, Ø 40 mm at the other.
- 110 mm long.
- Joins Spark's most common silencer inlet diameter to its most common link-pipe diameter.
- Spark part number SGMA14, made in Mantova, Italy.
The Two Numbers It Bridges
Sixty is the inlet of Spark's universal Force Evo, Konix Evo, Grid-O and Megaphone silencers. Forty is the diameter most link pipes and mid-sections are built at.
Between those two sits this cone. It is the single most likely transition a Spark-based custom build will need, which is why Spark makes it as a part rather than leaving it to the fabricator.
Why a Cone and Not a Step
A sudden change of diameter is a pressure step: gas that has been travelling at one velocity meets a different section and part of the energy reflects back up the pipe. A gradual taper does the same job without the reflection.
A hundred and ten millimetres over a twenty millimetre change is a shallow taper by any standard. That is the point.
Making the Transition Yourself
The alternative is a rolled cone, which means a flat pattern, a set of rolls, a lengthwise weld and a great deal of fettling to make both ends round. It is a genuine sheet-metal job and it takes longer than the rest of the system.
At its price, this article is not a compromise.
Welding It In
Both ends are plain tube ends, so both can be butt-welded or sleeved. Tack in four places, check the alignment down the bore before running a bead, and remember that the cone will pull the assembly out of line if the tacks are uneven.
Length Matters Here
A hundred and ten millimetres is not a lot of space to lose in a tight build, and the cone cannot be shortened without changing the diameters at its ends. Measure the run before ordering: if there is no room for a full-length transition, a stepped joint made from two tube sizes is the fallback.
Direction
It works either way round as a piece of metal, but gas flows better through a diffusing cone than through a contracting one. On a normal build the 40 mm end faces the engine and the 60 faces the silencer.
FitmentWhich bikes this fits▼
Universal product — Please check whether it fits your bike.
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