Allis Chalmers 226 Engine Headers
Printed From: Unofficial Allis
Category: Allis Chalmers
Forum Name: Farm Equipment
Forum Description: everything about Allis-Chalmers farm equipment
URL: https://www.allischalmers.com/forum/forum_posts.asp?TID=208341
Printed Date: 28 Sep 2025 at 10:47pm
Software Version: Web Wiz Forums 11.10 - http://www.webwizforums.com
Topic: Allis Chalmers 226 Engine Headers
Posted By: SLM(IL)
Subject: Allis Chalmers 226 Engine Headers
Date Posted: 28 Sep 2025 at 5:41pm
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I would like to get some opinions on this header set up for an Allis 226 engine ( https://www.keystoneturbo.com/product-page/allis-chalmers-wd-ramhead-header" rel="nofollow - https://www.keystoneturbo.com/product-page/allis-chalmers-wd-ramhead-header ). It looks good and sounds good, but Keystone has not done any dyno testing for horsepower or torque. They are estimating 20% to 25% HP gain, I'm not sure if headers alone would gain that much. This should be a video of it set up and running on a WD https://www.facebook.com/100072292363147/videos/pcb.750550677364671/1534044748001184" rel="nofollow - https://www.facebook.com/100072292363147/videos/pcb.750550677364671/1534044748001184
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Replies:
Posted By: DrAllis
Date Posted: 28 Sep 2025 at 6:43pm
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I had no idea the Keystone Klowns were still peddling their "go faster" tractor parts so that you could be another victim. First of all, an "equal length" exhaust manifold (or header as you call it) is for automotive engines that run waaay faster than 2000 RPM. So,right off the bat, what is the purpose here ?? They claim a 20 HP gain ?? Over what ?? A 35 HP WD engine?? maybe, but not a 55 HP D-17 engine. It's really strange they offer no real proof to back up their wild claim. If you notice, the carburetor on that particular engine is a D-19 sized unit. That carb size is good for 5 to 8 HP on a dyno at 2,000 RPM with a stock manifold and no more than that. If you use your STOCK carb, you will gain NOTHING !! So, what are you trying to accomplish ??? If you are an antique tractor puller, all the clubs I associate with wouldn't allow that manifold because it ain't stock/factory replacement. For $1450 dollars I'd rather install an 8 to 1 compression 4 1/8" motor kit and then you'd have something. Exactly what is the tractor model/engine model?? and what is your goal here ?? Do a real internet search on Keystone turbocharger kits and some of the blown up engines that were the result. This is all my OPINION.
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Posted By: SLM(IL)
Date Posted: 28 Sep 2025 at 8:50pm
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Thank you for your reply Doctor, I was hoping to get your opinion. I did make a mistake in my original post. They are claiming 20% to 25% HP improvement, not 20 HP as I had written. On a D17 I think this would be a 10 -15 HP gain over stock. I have a hard time believing this with out any testing to prove it, however I wanted to get some other opinions.
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Posted By: DrAllis
Date Posted: 28 Sep 2025 at 8:51pm
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What is your goal?? or reason for even considering this thing ??
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Posted By: DrAllis
Date Posted: 28 Sep 2025 at 8:55pm
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20% of 55 pto HP is 11 HP. And you MUST use the D-19 carb to achieve that. And that is their guess. I said I can get 5 to 8 HP using your manifold ( throat altered) with a D-19 carb and I have dyno tested. Again, what are you wanting to accomplish ?? and what tractor model/engine model ??
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Posted By: SLM(IL)
Date Posted: 28 Sep 2025 at 9:55pm
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I have a D17 Series IV that I use with a disk mower, a 4 x 5 round baler, and is also my loader tractor. I have about 20 acres of hay ground and this tractor is handling it very well. I just happened to have this Keystone "header" information pop up on my Facebook page and thought I would check it out a little bit. I do think the header looks cool and sounds good, but I have a hard time believing it does what they say. I certainly would not pay $1450 plus shipping. I would not mind a little more horsepower, but I don't have the money for a different tractor, and I really like this D17.
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Posted By: DrAllis
Date Posted: 28 Sep 2025 at 10:19pm
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At overhaul time, install 8 to 1 compression pistons and gain 4 HP and better fuel economy.
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Posted By: SLM(IL)
Date Posted: 28 Sep 2025 at 10:46pm
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This tractor is showing over 6500 hours on a working tach. The engine runs like a top, does not use any oil, and spark plugs look nice when I change them. I'm thinking it's probably been overhauled at some point, If so, I don't what the internals are. How many hours do you normally see on these engines before an overhaul?
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