Engines: Difference between revisions

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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.
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.
*{{check}}{{check}}$225 for 15 hp. Aliexpress US ship - $15/hp. [https://www.aliexpress.us/item/3256806896343578.html?src=google&src=google&albch=shopping&acnt=708-803-3821&slnk=&plac=&mtctp=&albbt=Google_7_shopping&gclsrc=aw.ds&albagn=888888&isSmbAutoCall=false&needSmbHouyi=false&src=google&albch=shopping&acnt=708-803-3821&slnk=&plac=&mtctp=&albbt=Google_7_shopping&gclsrc=aw.ds&albagn=888888&ds_e_adid=&ds_e_matchtype=&ds_e_device=c&ds_e_network=x&ds_e_product_group_id=&ds_e_product_id=en3256806896343578&ds_e_product_merchant_id=5345481834&ds_e_product_country=US&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=20268592310&albag=&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gclid=Cj0KCQjwsuSzBhCLARIsAIcdLm4f_JF8JYlJ_rRXt3zGJFAZ8OjyZ4V1aiOGJn8ZUnB1AhqEPdXpvTcaAhenEALw_wcB&aff_fcid=c4338b482f5b48dc86c3ed1f12594f3a-1719256435966-09270-UneMJZVf&aff_fsk=UneMJZVf&aff_platform=aaf&sk=UneMJZVf&aff_trace_key=c4338b482f5b48dc86c3ed1f12594f3a-1719256435966-09270-UneMJZVf&terminal_id=0246e15293524158a520213957d8ed21&afSmartRedirect=y&gatewayAdapt=glo2usa#nav-review]. Down to $166 for the same - [https://www.aliexpress.us/item/3256808307673920.html?spm=a2g0o.productlist.main.19.4b39aed8e2CZKY&algo_pvid=3b67438e-b61b-4c1d-bcaa-30527b17baa6&algo_exp_id=3b67438e-b61b-4c1d-bcaa-30527b17baa6-18&pdp_ext_f=%7B%22order%22%3A%22-1%22%2C%22eval%22%3A%221%22%7D&pdp_npi=4%40dis%21USD%21768.92%21166.06%21%21%215508.00%211189.49%21%402103146f17489275841667844e2ea7%2112000045394988097%21sea%21US%210%21ABX&curPageLogUid=ZRY6S3jR2A26&utparam-url=scene%3Asearch%7Cquery_from%3A]
*{{check}}{{check}}$225 for 15 hp. Aliexpress US ship - $15/hp. [https://www.aliexpress.us/item/3256809598544762.html]
'''The threshold for relatively inexpensive engines is 19 hp.'''
'''The threshold for relatively inexpensive engines is 19 hp.'''
*27 hp - $980 - $36/hp - [https://www.amazon.com/Briggs-Stratton-49T877-0004-G1-Commercial-Cyclonic/dp/B00IUAYGVG/ref=asc_df_B00IUAYGVG/?tag=hyprod-20&linkCode=df0&hvadid=167118301188&hvpos=&hvnetw=g&hvrand=13505321821607907613&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9023315&hvtargid=pla-506378404232&psc=1]. And needs muffler.
*27 hp - $980 - $36/hp - [https://www.amazon.com/Briggs-Stratton-49T877-0004-G1-Commercial-Cyclonic/dp/B00IUAYGVG/ref=asc_df_B00IUAYGVG/?tag=hyprod-20&linkCode=df0&hvadid=167118301188&hvpos=&hvnetw=g&hvrand=13505321821607907613&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9023315&hvtargid=pla-506378404232&psc=1]. And needs muffler.
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=420 cc=
=420 cc=
*$250 free ship [https://www.aliexpress.us/item/3256808377112328.html?src=google&pdp_npi=4%40dis%21USD%21336.66%21192.30%21%21%21%21%21%40%2112000045736608384%21ppc%21%21%21&snps=y&src=google&albch=shopping&acnt=752-015-9270&isdl=y&slnk=&plac=&mtctp=&albbt=Google_7_shopping&aff_platform=google&aff_short_key=_oDc8nzq&gclsrc=aw.ds&albagn=888888&ds_e_adid=775771422608&ds_e_matchtype=search&ds_e_device=c&ds_e_network=g&ds_e_product_group_id=2441360045959&ds_e_product_id=en3256808377112328&ds_e_product_merchant_id=5551326180&ds_e_product_country=US&ds_e_product_language=en&ds_e_product_channel=online&ds_e_product_store_id=&ds_url_v=2&albcp=23046469188&albag=189807470550&isSmbAutoCall=false&needSmbHouyi=false&gad_source=1&gad_campaignid=23046469188&gbraid=0AAAAA_eFwRAfVedGYBS-FUOZ-naoiaH3s&gclid=Cj0KCQiA0p7KBhCkARIsAE6XlanX-RwRVHlJKpCuARViDhbfwGaBt8EPRbdO_oPUIz6_Kgto1Z0yakMaAhG1EALw_wcB&gatewayAdapt=glo2usa]
*$300 [https://www.amazon.com/Engine-Stroke-Gasoline-Recoil-Splitter/dp/B07SS34FL6?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A1K701V6WP5WUK]
*$300 [https://www.amazon.com/Engine-Stroke-Gasoline-Recoil-Splitter/dp/B07SS34FL6?source=ps-sl-shoppingads-lpcontext&ref_=fplfs&psc=1&smid=A1K701V6WP5WUK]
*$283 [https://www.walmart.com/ip/Gas-Engine-420CC-15-HP-4-Stroke-Gasoline-Motor-Engine-Recoil-Start-Go-Kart-Log-Splitter-Lifan-Type-Engine-OHV-Pull-Start-Garden-Tool-Gas-Motor/2472065482?wmlspartner=wlpa&selectedSellerId=101089463&adid=222222222282472065482_101089463_14069003552_202077872&wl0=&wl1=g&wl2=m&wl3=42423897272&wl4=pla-295289030566&wl5=9023282&wl6=&wl7=&wl8=&wl9=pla&wl10=484571015&wl11=online&wl12=2472065482_101089463&veh=sem&gad_source=1&gclid=CjwKCAiAqNSsBhAvEiwAn_tmxYkq9CuVjXhmOfrCIh62z250nQr79lEgVZD-W7WoiqUnZX-tt7Cr_hoC3FUQAvD_BwE]
*$283 [https://www.walmart.com/ip/Gas-Engine-420CC-15-HP-4-Stroke-Gasoline-Motor-Engine-Recoil-Start-Go-Kart-Log-Splitter-Lifan-Type-Engine-OHV-Pull-Start-Garden-Tool-Gas-Motor/2472065482?wmlspartner=wlpa&selectedSellerId=101089463&adid=222222222282472065482_101089463_14069003552_202077872&wl0=&wl1=g&wl2=m&wl3=42423897272&wl4=pla-295289030566&wl5=9023282&wl6=&wl7=&wl8=&wl9=pla&wl10=484571015&wl11=online&wl12=2472065482_101089463&veh=sem&gad_source=1&gclid=CjwKCAiAqNSsBhAvEiwAn_tmxYkq9CuVjXhmOfrCIh62z250nQr79lEgVZD-W7WoiqUnZX-tt7Cr_hoC3FUQAvD_BwE]
*$260 [https://www.amazon.com/DONSU-4-Stroke-Cylinder-Keyed-Straight-Gasoline/dp/B07ZF55ZXY/ref=asc_df_B07ZF55ZXY/?tag=hyprod-20&linkCode=df0&hvadid=385169503131&hvpos=&hvnetw=g&hvrand=11692132176509796224&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9023345&hvtargid=pla-837532324975&psc=1&mcid=eade5014d1d1381eb9fc9d25c3d1869b&tag=&ref=&adgrpid=78287725613&hvpone=&hvptwo=&hvadid=385169503131&hvpos=&hvnetw=g&hvrand=11692132176509796224&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9023345&hvtargid=pla-837532324975&gclid=Cj0KCQiAhomtBhDgARIsABcaYym1hCjCxZJJ6gxQLB7Ey8y4rnRwqnHiL7XOmyv8ZXzDBvPt02ZEUN0aAkeiEALw_wcB#customerReviews]
*$260 [https://www.amazon.com/DONSU-4-Stroke-Cylinder-Keyed-Straight-Gasoline/dp/B07ZF55ZXY/ref=asc_df_B07ZF55ZXY/?tag=hyprod-20&linkCode=df0&hvadid=385169503131&hvpos=&hvnetw=g&hvrand=11692132176509796224&hvpone=&hvptwo=&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9023345&hvtargid=pla-837532324975&psc=1&mcid=eade5014d1d1381eb9fc9d25c3d1869b&tag=&ref=&adgrpid=78287725613&hvpone=&hvptwo=&hvadid=385169503131&hvpos=&hvnetw=g&hvrand=11692132176509796224&hvqmt=&hvdev=c&hvdvcmdl=&hvlocint=&hvlocphy=9023345&hvtargid=pla-837532324975&gclid=Cj0KCQiAhomtBhDgARIsABcaYym1hCjCxZJJ6gxQLB7Ey8y4rnRwqnHiL7XOmyv8ZXzDBvPt02ZEUN0aAkeiEALw_wcB#customerReviews]
=35 hp=
=35 hp=
*$750 a pop from China [https://www.alibaba.com/product-detail/Top-Quality-OHV-Twin-V-Cylinder_1601201778490.html?spm=a2700.details.popular_products.7.71ea5e70Oqm8dI]
*$750 a pop from China [https://www.alibaba.com/product-detail/Top-Quality-OHV-Twin-V-Cylinder_1601201778490.html?spm=a2700.details.popular_products.7.71ea5e70Oqm8dI]

Latest revision as of 21:29, 27 December 2025

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

3hp

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.
  • Check.pngPredator HF $150 212 cc - [6]. Performance review is solid [7]
  • Check.pngGX160 clone Walmart $134 [8]. Elect. start $70 more [9]
  • Check.pngWalmart $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.

  • Check.pngCheck.png$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. Check.png Has 15A charging. Muffler - [20]
  • Check.pngCheck.png16hp - $370 - Duromax, $23/hp - [21]
  • 7 hp - $159 - $22/hp - but no electric start - [22]
  • 18hp Duromax $18/hp - has muffler, but not charging Cross.png- such as for a fan - [23]

1000CC EFI

  • Check.png$30/hp china so double it for real cost - [24]

420 cc

35 hp

  • $750 a pop from China [29]

Diesel

  • 30 hp Kubota $5000 - $166/hp [30]
  • 33 hp Kubota - $6500 [31]
  • 65 HP - $6300 - $100/hp [32]
  • 200 hp - $55/HP - $11k - Cummins - [33]
  • 360 HP Mack used - $10/HP - $3600
  • 300 hp [34] $7500 [35]

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 - [36]
  2. 2000-4000 year life of car engines [37] - 150k miles
  3. Tractor engines - 5-10k hours [38]
  4. Pellet-fired stirling engine buggy - see PDF file
  5. Several links to various engine types including Sterling, Wankel, Steam, etc. [39].

Types

Rotary

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