Engines

About

• 2-strokes have 3-9 hp at 50 cc. See cc to hp - [1]
• Ex - Stihl MS 660 is 7 hp and 91 cc

50 cc with Electric Start

• $209 -[2]

3hp

• $40 - [3]

6.5 hp

• For the $/hp ratio, the 212 cc range appears as good as the 16 hp range. 420 cc for 2 - cheaper than any 440 cc.
• Predator HF $150 160 cc - [4]. Performance review is solid [5]
• With electric start - 212 cc - $119 [6]
• Honda GX160 clone - $110 - 6.5 hp [7]

20 hp Range

Selection

OSE's 2020 choice for an engine is the Poulan 19 hp x4 for 74 hp - [8]

Gas

The threshold for relatively inexpensive engines is 19 hp.

• 27 hp - $980 - $36/hp - [9]. And needs muffler.
• 24 hp - $870 - $36/hp [10]
• 22 hp - Briggs - $29/hp - [11]
• 20 hp - Kohler $700 - $35/hp + muffler - [12]
• 19 hp Poulan - - $20.5/hp - $390 - [13]
• 16 hp - $350 - Poulan - [14]. No gas pump, gravity feed gas. But, doesn't come with muffler. Has 15A charging. Muffler - [15]
• 16hp - $330 - Duromax, $20.6/hp - [16]
• 7 hp - $159 - $22/hp - but no electric start - [17]
• 18hp Duromax $18/hp - has muffler, but not charging - such as for a fan - [18]

Diesel

• 30 hp Kubota $5000 - $166/hp [19]
• 33 hp Kubota - $6500 [20]
• 65 HP - $6300 - $100/hp [21]
• 200 hp - $55/HP - $11k - Cummins - [22]
• 360 HP Mack used - $10/HP - $3600
• 300 hp [23] $7500 [24]

Considerations

• Until an open source engine becomes a reality, engine repair is expensive. $50/hr, easily comes to the new engine price for the $300 gas engine. This indicates that small engines are essentially disposable goods.
• For the large diesel engine, parts are expensive.
• Until the advent of the open source diesel engine, engine costs remain 10x as high as they should be.
• Until the OS engine, disposable engines are a suboptimal but acceptable strategy to keep costs of engine systems low.
• It is an immediate priority of OSE to develop open source small engines, $11B market (see Market Size) and larger ones are more like 200 billion

Engine Links

1. 500 &U 1000 hour lifetime for small engines - [25]
2. 2000-4000 year life of car engines [26] - 150k miles
3. Tractor engines - 5-10k hours [27]
4. Pellet-fired stirling engine buggy - see PDF file
5. Several links to various engine types including Sterling, Wankel, Steam, etc. [28].