Fuel economy G-226 engines
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Category: Allis Chalmers
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URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=171145
Printed Date: 05 Sep 2025 at 2:59pm
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Topic: Fuel economy G-226 engines
Posted By: DrAllis
Subject: Fuel economy G-226 engines
Date Posted: 15 May 2020 at 6:42pm
| Data from Nebraska Test files: A-C D-17 gas (7.25 to 1 compression) made 52.7 PTO HP @ 1650 RPM burned 4.535 GPH fuel rate with efficiency of 11.6 HP hrs per gallon in 1957. Ten years later the A-C One-Seventy (8.0 to 1 compression) made 51.5 PTO HP @ 1650 RPM burned only 3.986 GPH with efficiency of 12.9 HP hrs per gallon. This is pretty remarkable considering the One-Seventy had a live hydraulic pump that was sucking 4 to 5 HP from the engine. The difference?? higher compression !!!! 1650 engine RPM on these two tractors was approximately 540 PTO speed. |
Replies:
Posted By: wjohn
Date Posted: 15 May 2020 at 8:17pm
|
Exactly! Sure wish all of the engine overhaul/piston kits would list compression ratio... Makes a huge difference. I'm worried whatever kit I put in my WD might drop it slightly below factory. ------------- 1939 B, 1940 B, 1941 WC, 1951 WD, 1952 CA, 1956 WD-45 |
Posted By: MACK
Date Posted: 15 May 2020 at 9:23pm
| Dr, you like me have dinoed a lot of tractors. Two just alike don't always do the same. Some do better than others. Same with D17 and 170. MACK |
Posted By: AC7060IL
Date Posted: 15 May 2020 at 11:27pm
| Yes, quite an AC Legacy for the G226 - D17,One-Seventy,170,175,One-Eighty,SP-100,Gleaner E,EIII, stationary power units, forklifts, cotton pickers,... any other applications? |
Posted By: DrAllis
Date Posted: 16 May 2020 at 7:25am
| Since 1975, I imagine I've overhauled at least two dozen D-17's, and most of them would have been series 4's. Each one of them always got 8.0 to 1 motor kits from a One-Seventy. The customer was never told any different and not one ever complained about how it ran afterwards. |
Posted By: Ed (Ont)
Date Posted: 16 May 2020 at 9:00am
| Are those kits still available from Agco? Or other sources? |
Posted By: ac45dave
Date Posted: 16 May 2020 at 9:40am
------------- 54 wd-45gas ; 56 wd-45d N/F w/fact p/s ; 63 d-17 sIII N/F gas ; 60 D14 N/F ; 67 d-17 sIV N/F gas ; 63D15 sII W/F; 39rc#667 ; 2021 massey 4710 fwa ; gravely 2 wheel tractors |
Ed (Ont) wrote:Posted By: AllisFreak MN
Date Posted: 16 May 2020 at 11:52am
One Eighty? I think they were 6 cylinder.
------------- '49 A-C WD, '51 A-C WD, '63 A-C D17 Series III, 1968 A-C One-Seventy, '82 A-C 6060, '75 A-C 7040, A-C #3 sickle mower, 2 A-C 701 wagons, '78 Gleaner M2 |
Posted By: AC7060IL
Date Posted: 16 May 2020 at 2:03pm
|
You’re correct about 6 cyl One-Eighty. According to Norm Swinford’s AC 1914-1985 book, the 1st 100 One-Eighty gas tractors that AC built, plus the gas prototype, used the 4 cylinder, G226@2000rpm~60 pto hp which debuted in 1967. Then AC realized that the G226’s increased engine rpms caused a vibration (1650 to 2000rpm) that put their operator’s feet to sleep. However upon further testing the prototype did not vibrate. But it was the only one. So AC converted several dozen G226 gas to 301 diesels. In 1969, AC again began building the One-Eighty gas (sn:6644)using the G2500 6 cylinder gas. |
Posted By: AC 4 Ever
Date Posted: 19 May 2020 at 8:37am
|
Been searching online for about a month to see what is available in kits for my D17 gas tractor. Reliance 915144. 4 inch bore. 8.25:1 CR expensive kit. About $1600. Here is a link to the Reliance kits available taken from the JenSales site: http://https://www.jensales.com/products/allis-buda-4-cylinder-gas-and-lp-g226-engine-kits-and-parts-ac-226-e.html" rel="nofollow - http://https://www.jensales.com/products/allis-buda-4-cylinder-gas-and-lp-g226-engine-kits-and-parts-ac-226-e.html Another manufacturer sell a flat top piston overhaul kit, IK-405 or OK-405 for half the money at TractorJoe.com. which sells both brands at the best price found, so far. RP 915151(7.25CR) under $500 with shipping. The 405 series is the flat top piston. Have yet to find one of these in a 4 inch bore. OK Tractor also sells these kits. Abilene Machine, AgKits.com, etc. sell these kits with the 7.25CR. Some of these also include cam bearings. I can't remember the name of the company that distributes these kits. Three words first starts with an A. They use parts from several sources to put together these kits. A dealer told me over the phone but I failed to write it down. I saw a couple of kits that offered a standard kit and an upgrade with better bearings. My Allis mechanic of 50 years has a contract with Reliance, and uses only standard 7.25 CR kits. Says the LP/170 version 8.25CR has starting issues. Not sure he is correct as Dr. Allis above has stated about the ones he has rebuilt for customers. I am starting the tear down of my D17 this week in my shop and will do all myself other than valve grinding and block boiling. Will evaluate/mic the crank to determine whether it will be turned down for the new bearings or not. Yet to decide which CR to go with. Number of sources for kits out there and most use these 2 brands of kits. I would buy the complete overhaul kit for a few dollars more just to get the complete gasket set for the engine regardless of doing the job inframe or out. Some inframe kits just include rod bearings, no mains but Reliance includes both in the 915151 and the 915144. The company has 3 different level of kits offered in both IN and out of frame. 112 series, 226 series and the 405's. One can buy the flat top pistons separately, but it is cheaper to buy a 7.25 kit and the pistons/rings separately. Truly a question of how much money you want to spend. Trying to buy all my stuff locally currently just to help out small business. Costs more but...."what can you do for your country"! |
Posted By: SteveM C/IL
Date Posted: 19 May 2020 at 10:55am
| Hi comp in a WD45 won't start hot on 6V. I can't see why a 12v system would have trouble with 8 or 8.25 comp. |
Posted By: DrAllis
Date Posted: 19 May 2020 at 1:23pm
| A 170 and 175 gas have the same starter as a D-17, so with a good battery there is no problem. |
Posted By: Boss Man
Date Posted: 19 May 2020 at 4:11pm
| When Reliance got bought out several years back, alot of their parts were discontinued. They used to be my go to source. Now they seem to just carry the poplar stuff like everyone else |
Posted By: AC 4 Ever
Date Posted: 20 May 2020 at 7:37am
|
Mine is 12 volt neg. ground w/generator. Just rebuilt the starter, carb, s bowl, ignition, and powerwashed before the overhaul starts. I have a good source of OEM "new"parts. The dealer I bought my series 3 D17 w/WF (42806) from in 1979 retired & sold the dealership. His son still fixes tractors in the old building and has many pallets of parts. New rod if I need one. He has a contract with Reliance so I will likely get my kit from him to keep my business local. A bit skeptical of the 4&1/8 bore sleeves Seems like they would have to be 1/16 thinner walled, though he has yet to see any fail that he has installed. I don't need more horsepower. I had a cylinder with a bad oil ring. I put a hotter plug on and 2 years later on a hot day brush hogging(6footer) warm season grass seized the piston w/normal water temp. After cooling for 4 hours it started again but had noise. Shut it down. Towed it back. Been parked since last fall. Rolling it in my shop and start taking it apart tomorrow. Full overhaul/repair. Boil the block. Machine/replace crank&rod if needed. Rebuild the head complete with guides,etc. Rebuild oil pump if needed. All new bearings. Clutch if needed. I completely rebuilt the PD clutch several years ago when the fork/bearing failed. I'm 65, the tractor will outlive me but be should be good machine for years to come. ------------- Evaluate, adapt, and overcome! Necessity is the mother of invention! |
Posted By: AC 4 Ever
Date Posted: 17 Jun 2020 at 7:23am
|
Finally got the engine out and apart. Spun the front and center thrust mains. Wore the caps and block .040. Thrust bearing thrust plate wore .030 from rear side of cap and block. Crankshaft has .032 groove at worst location. 3 inch journals oem. Yet to check to see if straight to grind. Rod journals were fine. Looking for a block to replace AM 4660-02 casting. There were more than one 4660 editions. I have located a 4660-03. Did they use the same caps? Anyone have any knowledge on these casting variations? Thanks! ------------- Evaluate, adapt, and overcome! Necessity is the mother of invention! |
Posted By: DrAllis
Date Posted: 17 Jun 2020 at 7:46am
| If your crankshaft has a .032" grove in it, it probably isn't worth grinding. Find a good used engine. One from a Gleaner "E" combine preferably. |