United States
Environmental Protection
^1	Agency
Office of Transportation and Air Quality
E PA-420- B-19-020
April 2019
U.S. EPA-NVFEL Small SI Engine Setup
All documentation sent to EPA must be written in English
1.	Please supply a location or port for the following thermocouples:
•	Cylinder Head temperature
•	Inlet Air temperature
•	Engine Oil temperature (not applicable for 2-stroke engines)
•	Exhaust temperature - if port is supplied, should be Vi" female iron pipe
size (IPS) threads
2.	The engine must be supplied with any necessary external cooling, if applicable.
3.	The engine must include either a recoil or electronic starting system and starting
instructions. A pulley with a rope is not considered a starting system, and EPA
will not accept this type of engine.
4.	The manufacturer should supply all oil needed for testing in a labeled container
separate from the engine (i.e., may be one shipment consisting of two containers).
If oil is shipped to EPA, the manufacturer must also supply the relevant MSDS
Sheets.
5.	The engine must include all throttle-related components used for engine testing.
If the engine is equipped with an electronic throttle, the necessary components
may include modules, cables, rods, wiring diagrams, instructions written in
English, and an electronic engine shut-down switch.
6.	A procedure to disable the governor must also be supplied (i.e., governor control
system).
7.	EPA's lab provides the 12 Volt and Ground contacts for an electronic ignition
system. The manufacturer must supply a dry contact relay for the engine shut-
down switch.
8.	The test engine must have an installed and functioning hour meter. The hour
meter must have 1/10 resolution and accurately depict the engine's operating
hours.
9.	The engine must be supplied with the operator's manual, written in English.
10.	The direction of crankshaft rotation must be marked on the outside of the engine.
11.	The engine must be equipped with a muffler, air cleaner, all emissions
components consistent with the certification applications, and any other
components needed to run the test.

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12.	The manufacturer must supply a complete fuel system if the engine is sold with a
fuel system. If the engine is not sold with a fuel system, then the appropriate fuel
system information must be supplied.
13.	Nonhandheld engines only - Manufacturer must supply an engine that can be
installed on a standard one-inch shaft. If the driveshaft is tapered, the
manufacturer must supply an adapter that converts the driveshaft to a standard
one-inch straight shaft. See the drawing below for details.
2
14. Handheld engines only - A typical string trimmer installation is depicted below.
EPA will install the engine by clamping the Shaft Housing into a Fixture. The
Engine's output must accept a 5mm Flexible Drive Shaft for attachment to the
Dynamometer.
Dimensions of the Shaft Housing must meet the following requirements:
•	Inside Diameter = not less than 0.75 inch
•	Outside Diameter = 1.00 inch
•	Length = Extend 3 inches from nearest edge of engine case
•	Shaft Housing must be well secured to the Engine as to prevent rotation/slippage
during testing.

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If your engine's configuration prohibits this installation, contact Julia Giuliano
(Giuliano iulia@epa.gov) or your certification representative immediately. Engines that
cannot be clamped onto EPA's fixture will be considered a failed emission test, unless
prior EPA-approval to ship the engine in a different configuration is received.
NOTE: The Fixture and Flexible Drive Shafts depicted below will be supplied by
EPA. The manufacturer is responsible for the Engine and Shaft Housing.

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