226/201 engine build

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   I know there are a lot of engine build size of bore and stroke. What pistons or rods to use. 
I'm asking what size engine make what for power. 
  I know head flow and carb or manifolds affect it but. A general idea how big gets you what for power. 

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Fields 45 Members Profile Send Private Message Find Members Posts Add to Buddy List Bronze Level Joined: 13 hours 12 minutes ago Location: Wisconsin Points: 2	Post Options Post Reply Quote Fields 45 Report Post Thanks(0) Quote Reply Topic: 226/201 engine build Posted: 13 hours 2 minutes ago at 6:02pm
	I know there are a lot of engine build size of bore and stroke. What pistons or rods to use. I'm asking what size engine make what for power. I know head flow and carb or manifolds affect it but. A general idea how big gets you what for power.

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DrAllis Members Profile Send Private Message Find Members Posts Add to Buddy List Orange Level Access Joined: 12 Sep 2009 Points: 21864	Post Options Post Reply Quote DrAllis Report Post Thanks(0) Quote Reply Posted: 10 hours 51 minutes ago at 8:13pm
	I'm not exactly sure what you are seeking here, and not sure there is an exact answer due to soooo many variables. A model WD gas was a 201 and was rated at 34 PTO HP @ 1400 rpm. A WD-45 gas had the same 4 inch bore and a 4 1/2" stroke which gave it 25 more cubic inches. It was rated at 45 PTO hp. BUT, it wasn't all about 25 additional cubic inches. The compression was raised from 5.5 to 1 to 6.5 to 1. The carburetor and air cleaner were larger. The intake/exhaust manifold was better flowing. So, it took 3 changes to gain about 10 HP. Let's look at the WD-45 and the D-17 gas engines. Both engines were 226 cubes. The WD-45 compression was 6.5 to 1. The D-17 was 7.25 to 1 with the same 4 inch bore. The carb was identical between the two tractors. The engine speed went from 1400 rpm full load to 1650 full load speed. So, the D-17 engine got more compression and an increase in speed. The model 175 gas tractor was still 226 cubes had 8.25 to 1 compression, and higher lift camshaft, a slightly larger carburetor and rated speed was now 1800 RPM instead of 1650. It gained 10 more flywheel HP over the D-17 engine. Now, what is your question ?? You can have more cubes with lower compression and have LESS HP. Carb size affects HP output, as does engine speed.