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
• 1 hp for $25 for simple small engines.
• 1000 hp are $25k for the largest tractor in the world.

50 cc 2 stroke

• Only 1.3 hp? $50 about. [2]

Large

• JD 9 series engine, 14.l, 450 hp - around $30k [3]

50 cc with Electric Start

• $209 -[4]

3hp

• $40 - [5]

6.5 hp

• For the $/hp ratio, the 212 cc range appears slightly better than the 16 hp range. 420 cc for 2 - cheaper than any 440 cc.
• Predator HF $150 212 cc - [6]. Performance review is solid [7]
• GX160 clone Walmart $134 [8]. Elect. start $70 more [9]
• Walmart $144 7.5 hp 212 cc Electric Start [10]
• With electric start - 212 cc - $170 [11]
• Honda GX160 clone - $160 - 6.5 hp [12]

20 hp Range

Selection

OSE's 2020 choice for an engine is the Poulan 19 hp x4 for 74 hp - [13]

Gas

Note: at $15-20/hp - if the engine is considered 'disposable', it is actaully a good choice. Old copies can be used for parts, as long as the same engine is used. If there are different engines with different parts, maintenance is onerous.

• $225 for 15 hp. Aliexpress US ship - $15/hp. [14]

The threshold for relatively inexpensive engines is 19 hp.

• 27 hp - $980 - $36/hp - [15]. And needs muffler.
• 24 hp - $870 - $36/hp [16]
• 22 hp - Briggs - $29/hp - [17]
• 20 hp - Kohler $700 - $35/hp + muffler - [18]
• 16 hp - $350 - Poulan - [19]. No gas pump, gravity feed gas. But, doesn't come with muffler. Has 15A charging. Muffler - [20]
• 16hp - $370 - Duromax, $23/hp - [21]
• 7 hp - $159 - $22/hp - but no electric start - [22]
• 18hp Duromax $18/hp - has muffler, but not charging - such as for a fan - [23]

420 cc

• $300 [24]
• $283 [25]
• $260 [26]

Diesel

• 30 hp Kubota $5000 - $166/hp [27]
• 33 hp Kubota - $6500 [28]
• 65 HP - $6300 - $100/hp [29]
• 200 hp - $55/HP - $11k - Cummins - [30]
• 360 HP Mack used - $10/HP - $3600
• 300 hp [31] $7500 [32]

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 - [33]
2. 2000-4000 year life of car engines [34] - 150k miles
3. Tractor engines - 5-10k hours [35]
4. Pellet-fired stirling engine buggy - see PDF file
5. Several links to various engine types including Sterling, Wankel, Steam, etc. [36].