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  #41  
Old 08-24-2018, 04:05 PM
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sorner sorner is offline
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Before this great debate gets locked I'm gonna go ahead and say that it's nice to see coop and Jon on the same side for once.
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1912 with Kohler M18 engine repower, CI rear, 50C deck, 364 snow blower
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  #42  
Old 01-10-2023, 07:23 AM
Club Cadet Club Cadet is offline
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I do not have the answer to the original question but I think I understand what you are asking.

You would like to know how much to mill the heads to increase the compression ratio to the point where you have to run higher octane fuel to keep it from detonating (aka spark knock / aka pinging). As I understand it, this is usually a quick and inexpensive way to increase engine HP on water cooled engines like a small block V8. I don't think air cooled engines respond as well to this trick due to the limited cooling capacity of the air cooled engine design. Increasing the compression ratio increases ignition temperature. The valve in block design is also fighting you. Its design is also inefficient compared to an overhead valve engine like a small block V8. I think the flat head engine design responds better to increase air flow work of bigger cam/larger valves/ carb work/exhaust work than a bump in compression ratio.

You are also starting with a twin cylinder M18. These engines do not seem to be the choice for hot rodding. I'm not sure why - maybe because they already have 18HP and great torque from the twin cylinder design? Maybe they are too heavy in the wrong places for a pulling setup?
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  #43  
Old 01-10-2023, 07:29 AM
Club Cadet Club Cadet is offline
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My bad

After I posted I saw there were 5 pages to this thread and I'm just beating a dead horse
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  #44  
Old 01-10-2023, 08:54 AM
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1711Cub 1711Cub is offline
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Originally Posted by Club Cadet View Post
I do not have the answer to the original question but I think I understand what you are asking.

You would like to know how much to mill the heads to increase the compression ratio to the point where you have to run higher octane fuel to keep it from detonating (aka spark knock / aka pinging). As I understand it, this is usually a quick and inexpensive way to increase engine HP on water cooled engines like a small block V8. I don't think air cooled engines respond as well to this trick due to the limited cooling capacity of the air cooled engine design. Increasing the compression ratio increases ignition temperature. The valve in block design is also fighting you. Its design is also inefficient compared to an overhead valve engine like a small block V8. I think the flat head engine design responds better to increase air flow work of bigger cam/larger valves/ carb work/exhaust work than a bump in compression ratio.

You are also starting with a twin cylinder M18. These engines do not seem to be the choice for hot rodding. I'm not sure why - maybe because they already have 18HP and great torque from the twin cylinder design? Maybe they are too heavy in the wrong places for a pulling setup?
While these are a great, proven engine, there is little to no factory or aftermarket support for them. They are thirsty, and the Command took over with more power and efficiency. The Command is still produced, so if tricking out a twin cylinder air cooled engine is your thing, that would be the way to go.
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Cub Cadet is a premium line of outdoor power equipment, established in 1961 as part of International Harvester. During the 1960s, IH initiated an entirely new line of lawn and garden equipment aimed at the owners rural homes with large yards and private gardens. There were a wide variety of Cub Cadet branded and after-market attachments available; including mowers, blades, snow blowers, front loaders, plows, carts, etc. Cub Cadet advertising at that time harped on their thorough testing by "boys - acknowledged by many as the world's worst destructive force!". Cub Cadets became known for their dependability and rugged construction.

MTD Products, Inc. of Cleveland, Ohio purchased the Cub Cadet brand from International Harvester in 1981. Cub Cadet was held as a wholly owned subsidiary for many years following this acquisition, which allowed them to operate independently. Recently, MTD has taken a more aggressive role and integrated Cub Cadet into its other lines of power equipment.

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