Miser Engine photo
Click image for larger view.
Miser Low Temp Stirling Cycle Engine Plans

The Miser engine type is the best conversation piece ever invented.  It will run on a cup of warm coffee, the warmth of your hand, or even an ice cream cone! Here is an engine that you can actually operate in bed with no danger of setting the sheets on fire!

This modified Heinrici stirling cycle engine doesn't need a fire to operate it. It has no valves, ignition system, carburetor, or exhaust. It will run on any heat source such as on top of a cup of warm water (coffee), from the heat of a light bulb if placed on top of a lamp shade, in full sunlight, on a TV, VCR, and a zillion other sources. It runs at about 90 RPM when held in the palm of a hand and much faster with the other heat sources. It will also operate in reverse from a cold source such as ice or snow. As can be seen, the possibilities are almost endless.

Folks who are not ordinarily interested in engines of any kind are always curious about this one. Unlike other low temperature engines, I designed Miser to actually look like an engine! Isn't that a novel idea! It is not as hard to build as it may look, but you can simplify the styling if you are in a hurry to get yours running.

Miser is built mostly from aluminum alloy bar stock and plate, while most of the smaller parts are of brass or steel. A few parts that can't be metal because they need to be good heat insulators are made from clear acrylic (so the works can be seen) or delrin. The HTF (Hard-To-Find) Materials Kit below contains the needed materials that may be difficult for most builders to obtain otherwise. They would also cost more when obtained from separate multiple sources even if the minimum order amount was not a problem. The plans are also available separately - see below.

The plans set consists of 10 sheets of quality laser printed CAD drawings and 2 sheets of construction and assembly notes.

Specifications: Flywheel Diameter: 5.2", Cylinder Bore: .600", Piston Stroke: .625", Overall Height: 7.4" Experience Level: 10

Additional Items Available for Miser:     (see photos at

Miser Metal Set:
Rough metal to build Miser (except screws & drill rod).  19 pieces, 5lbs.  (available USA only)

Graphite & Bearings Set:
(1) 5/8" OD x 1.4" long graphite rod to make piston; (2) 5/32" ID x 5/16" OD x 1/8" thick, flanged precision ball bearings; (1) 3/8" OD x 1.9" long Delrin rod for displacer bushing & crosshead.

6" OD x 5.5" ID x 1.06" H Plexiglas Miser Displacer Ring:  Extruded Plexiglas Tubing cut at the factory to 1.06" height.  You will need to trim these down to 1".   

Miser Polystyrene Displacer:  6" square x 0.6" thick polystyrene to make the displacer disk.

All items sold separately.  Order these items below.

"Your Miser engine looks good, not like some half finished scientific experiment." - Mal Horsfall (Quakers Hill, NSW Australia)

     View Plan Sample   All Customer Comments    You Tube Videos
Buy Now $21.00, Save 25% and No Shipping Cost!

Or for standard U.S. Postal Service shipping, select 'Add to Cart'  below:

[Shipping & Conditions]  [Mail in Orders]  [View Shopping Cart]  [Shopping Cart Help]

Miser Engine Plans
Miser Rough Metal Set
Miser Graphite & Bearings Set
Miser Displacer Ring
Miser Displacer Disk Polystyrene

Mini Miser 1/2 Size (Hard to Find Materials)

Follow full-size Miser plans except reduce all dimensions by half. Contains piston and crosshead alternative plans, and notes on construction/operation differences.

Materials Set: (1) .95" length of 3/8" dia graphite; (2) 3/32" ID x 3/16" OD x 3/32" thick flanged, shielded ball bearings; (1) 3/32" x 1-1/4" drill rod; (1) 2-7/8" square of 1/2" thick polystyrene foam; (1) 1/2" slice of 3" OD x 2.75" ID plexiglass tube; (2) 4" length of 1/8" dia delrin, (1) 7/8" length of 1/4" dia delrin.

1/2 Size "Mini Miser" Parts Set
Item ID: 1/2MISER-KIT 

Plans & Parts | Ignition Systems | Bearings | Misc. Items | Boehm Engine Kits
Contact Us | Catalog | Comments | Links | Forum | Model Engineering Tips  | On the Road | Tribute to Jerry

Copyright 2010 Outpost Enterprises LTD.  All Rights Reserved.