SuperTrapp Spark Arrestor Muffler Model 3S
Ideal for 2-50 horsepower engines
U.S. Forest Service approved spark arrestor No. T-100
Model 3S adapts to a wide range of engines from 2 to 50 HP. Recommended for engines to 10 HP where minimum exhaust noise is required and for larger engines where space is limited. Supplements an existing muffler where minimum exhaust noise is critical.
Easy to Install
Multi-Position Rated
Cooler Exhaust
Quiet & Compact
Optional Resonator for Maximum Silencing
Model 3S Specifications
• Silver plated stainless steel lock nut
• End cap and carbon collection chamber
• Funneled entrance directs sparks into collection chamber
• Number of diffuser discs required is proportional to engine size
• Exhaust path curves upward while noise is diffused radially
• Legal .023″ spacing gives back-up spark protection even if collection chamber fills to capacity
• Replaceable stainless steel center bolt
• Full range of threaded and clamp-on inlet sizes available
| FLOW RATING at 1 psi Back-pressure |
NUMBER OF DISCS REQUIRED vs. ENGINE SIZE |
INLET SIZES AVAILABLE | |
|---|---|---|---|
| Threaded (T) | Clamp-On (C) | ||
| up to 250 CFM (18 discs) |
1 DISC per 3 HP | 1/2" to 1 1/2" NPT* |
1" to 2" dia. |
| DIAMETER D | LENGTH | WEIGHT | ||
|---|---|---|---|---|
| LS Standard Configuration |
LR With optional Resonator |
Standard Configuration | With optional Resonator | |
| 3" | 3 7/8" + .08"/disc | 6 1/2" + .08"/disc | 9 oz. + 1 oz./disc | 19 oz. + 1 oz./disc |
* Measured by inside inlet size.
SuperTrapp Model 3S Applications
Use approximately 1 Disc per 3 HP on Model 3S. The following graph relates the number of discs used to the resulting back-pressure.
Using 1 disc per 3 HP insures that the back-pressure stays within the engine manufacturer’s recommendations. The resulting back-pressure will not significantly affect power. 4-cycle engines will tolerate a back-pressure considerably higher than 2 psi without endangering the engine.
The accessory Resonator (part no. 3S-5500) is recommended if further exhaust silencing is required (3 to 5 dBA added reduction). For critical noise applications reducing the number of discs used is suggested, however, some power loss may result. In addition, engine shielding or an engine enclosure will be required to reduce the other engine and mechanical noises to that of the silenced exhaust.
The number of discs used may need to be increased if the SuperTrapp is added to an existing muffler or if used on an engine rated below 2400 rpm. Engines with dual exhausts should divide the recommended number of discs.
Model 5S is recommended for engines from 10 to 100 HP where minimum exhaust noise is required and for engines to 200 HP where space is limited. The SuperTrapp is not recommended for engines with oily or sooty exhausts.
Model 3S Parts List
A complete 3S model consists of the ADAPTOR and DIFFUSER DISCS. These components are sold separately. For OEM use all models may be factory assembled. Additional sizes available for O.E.M. use.
* NPT measured by inside inlet size.
| Adaptor - Threaded (T=Male NPT) | SIZE T | PART NO. |
|---|---|---|
T = Male NPT
|
1/2" NPT * | 3S-0500T |
| 3/4" NPT * | 3S-0750T | |
| 1" NPT * | 3S-1000T | |
| 1 1/4" NPT | 3S-1250T | |
| 1 1/2" NPT | 3S-1500T | |
| Adaptor - Clamp - On | SIZE C | PART NO. |
C = Exhaust pipe O.D.
|
1" | 3S-1000 |
| 1.050" (3/4 NPT) | 3S-1050 | |
| 1 1/4" | 3S-1250 | |
| 1.312" (1" NPT) | 3S-1312 | |
| 1 1/2" | 3S-1500 | |
| 1.660" (1 1/4" NPT) | 3S-1660 | |
| 1 3/4" | 3S-1750 | |
| 2" | 3S-2000 |
| ITEM | DESCRIPTION | PART NO. |
|---|---|---|
| 3-PACK | Required – use with above Adaptors | 3S-6503 |
| 12-PACK | Required – use with above Adaptors | 3S-6512 |
| RESONATOR | Accessory – for 3 to 5 dBA additional noise reduction | 3S-5500 |
| END CAP | Replacement | 3S-3031 |
| CENTER BOLTS | Replacement – Standard length (with end cap) | 3S-7363 |
| CENTER BOLTS | Replacement – Resonator length | 3S-7575 |
Optional Resonator Accessory
SuperTrapp accessory part no. 3S-5500
Additional noise reduction of 3 – 5 dBA
The optional accessory Resonator is recommended if further exhaust silencing is required (3 to 5 dBA added reduction). Engine shielding or an engine enclosure will be required to reduce the other engine and mechanical noises to that of the silenced exhaust.
Also from SuperTrapp
Model 5S
U.S. Forest Service approved spark arrestor No. T-101
10-200 horsepower engines
The Model 5S is designed for engines from 10 to 200 HP. Recommended for engines from 10 to 100 HP where minimum exhaust noise is required and for larger engines where space is limited. Supplements an existing muffler where minimum exhaust noise is critical.