The Ametek Lamb 11611001 is a two-stage bypass vacuum motor with peripheral discharge, built for 220 to 240 volt operation. Bypass construction routes cooling air through a separate path from the working airstream, which is what allows this class of motor to be used in wet and dry recovery machines and central vacuums where the suction air is not clean enough to cool the armature. It is bought almost entirely as a replacement motor by service techs rebuilding a central vacuum power unit or an extractor, and at close to 20,000 RPM with roughly 355 air watts it puts a machine back to the output it had when it was new.
Use Cases
- Rebuilds 220-240 volt central vacuum power units using a 5.7-inch two-stage motor
- Restores carpet extractors and wet recovery machines after motor failure
- Replaces motors in commercial canister vacuums on 240 volt single-phase supply
- Powers recovery equipment where the working air is too dirty or damp to cool a motor
- Serves as a shelf spare for shops servicing 240 volt central vacuum equipment
Specifications
- Blower stages: 2
- Fan diameter: 5.7 in
- Voltage: 220-240 V AC, 50/60 Hz
- Airflow system: bypass
- Air discharge: peripheral
- Maximum air watts: approximately 355
- Sealed vacuum (water lift): 97.8 in
- Maximum airflow: 102.7 CFM
- Speed: 19,767 RPM
- Bearings: double ball bearing
- Listed weight: 4.8 lb
- Agency: UL recognized, PRGY2, file E47185
Figures deliberately omitted
Published sources for this part disagree on the amp draw and, in one case, on the fan diameter. Rather than pick one, neither disputed figure is stated above. If current draw is critical to your build, contact us and we will try to confirm it against Ametek documentation before you order.
Fits
Supplier cross-reference tables for this motor family list a number of central vacuum power units, but those tables are published against the base part number rather than this exact suffix, and they conflict with other sources on core specifications. No compatibility list is published here for that reason. Confirm fitment against your machine model number, and against the physical dimensions and discharge orientation of the motor you are replacing, before ordering.
Frequently asked questions
Why does a bypass motor matter on a wet recovery machine?
In a bypass motor the working air never touches the windings; a separate fan draws clean air to cool the motor. That is why moisture in the recovered airstream does not immediately short the motor. A thru-flow motor exhausts the working air straight across the windings and will fail the first time water reaches it.
What does peripheral discharge mean?
The exhaust air vents evenly around the perimeter of the motor housing rather than exiting through a tube on the side. Machine housings are built around one arrangement or the other, so a peripheral motor has to replace a peripheral motor for the exhaust path to line up.
Can this run on 120 volts?
No. It is wound for 220 to 240 volt operation. On 120 volts it would spin far too slowly to develop useful suction. North American household equipment needs a 120-volt motor of the same body size and configuration.
Why is the current draw not listed?
Because published sources disagree on it for this part number, and one source also disagrees on the fan diameter. Rather than pick a figure and present it as fact, both disputed values are left out. Contact us if the amperage matters for your circuit and we will try to confirm it first.
Discount Cleaning Products is an authorized dealer for Ametek Lamb vacuum motors and stocks replacement motors, carbon brushes and service parts for commercial and central vacuum equipment. Orders are supported by a US-based team that works with these motors every day, so if you are unsure which body diameter, stage count, discharge style or voltage your machine takes, ask before you order.
