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Head Configurations--Power DC

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L.Lamp

10-25-2004 19:16:54




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I have seen propane heads, Hi Compression heads and all fuel heads. To me the propane and the all fuel head should deliver the most power because they are as close to hemi as you can get. I asked the machine shop why the DC hi compression head should give more power when only the area of that combustion chamber is exerting pressure on the piston at the time of combustion. The other two heads give full force to the top of the piston at the time of combustion. As a kid my dad farmed with a '42 DC with 3 7/8" Hi altitude pistons. It pulled 3-18's. When they got a new M in '48 It couldn't pull that plow and the plow was traded for 3-14's. I say if you can raise the compression on the hemi type heads they will outperform the the hi compression head. I would like to hear some engineering theory on this. Thanks!!

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DKase

10-27-2004 06:27:59




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 Re: Head Configurations--Power DC in reply to L.Lamp, 10-25-2004 19:16:54  
Larry; The shape of the combustion chamber has very little effect on the force on the piston. It is the force of the rod on the crankshaft that makes a difference. The force on the crank. is the greatest at a 90 degree to the crankshaft. At that point the piston is half way down and there is full force on the top of the piston. The greater torque on a long stroke engine comes from the greater distance between the main and rod bearings and more leverage to twist the crankshaft. If you put a propane head on a bored and stroked engine the compression would be to high and it would ignite like a diesel. It could fire before TDC, before the spark plug fires. I don't think I need to explain this to you. The comperssion ratio makes much more difference than the shape of the compression chamber. Hope this helps a little. DK

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L.Lamp

10-27-2004 08:24:43




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 Re: Head Configurations--Power DC in reply to DKase, 10-27-2004 06:27:59  
Isn't there a hydraulic principal involved here? This is the point I am trying to make. With the piston at the top and at the point of ignition the area of the hi compression head has a much smaller area than the low compression or propane heads. A larger bore hydraulic cylinder has a much greater capacity than a smaller one, the reason to increase the bore to get more cubic inches and compression. Force times the area. The area is limited on the hi compression head. The force is channeled straight down because of the shape of the combustion chamber. As the piston goes down more of the piston area is exposed to the pressure in the cylinder. What CASEPOWER says makes sense also. The airflow around the valves is better for the propane or low compression head. This seems to be backed up by what joecool says. He developes 65hp from 4 1/16" pistons and just a propane head. DC PULLER I am assuming is using a shaved hi compression head and a host of other refinements with 4" pistons for 53hp. I don't think the 1/16" inch would make up the difference in these to approaches. If I were building an engine I would use a propane head over stock pistons or above the deck pistons with the low compression head. I think Chrysler has it right. The hemi does make a big performance difference. I am not trying to be critical of anyone's project. These things at best are personal experiments. My '54 SC has been a disappointment to me. Even though it produces 31hp it just doesn't hang in there and pull.

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DKase

10-27-2004 11:33:27




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 Re: Head Configurations--Power DC in reply to L.Lamp, 10-27-2004 08:24:43  
The point that I was trying to make is that there is NO torque applied to the crankshaft when the piston is at TDC. When the wrist pin, rod journal, and main bearing are all lined up the only force is directly on the main bearing. Once the piston is part way down the rod is applying torque to the crankshaft. Why be concerned about the shape of the combustion chamber when the force on TDC does no good anyway. I don't understand the concept that you have that a smaller combustion chamber has only the force on the piston that is equal to the size if the combustion chamber. It is like a hydraulic cylinder. It is the square inches on the top of the piston that matters. If you don't think the pressure on every square inch of the top of the piston is the same you will have to explain to me the difference. The extra power that comes from the hemi head comes from the air flow through the valves and the way that the air is moving in the combustion chamber at ignition. Compression is a good thing to a certain point, but after that it is a bad thing. If you bore and stroke a DC you will not want a propane head. The compression would be to high. All the propane head is is a 5505 head with the valves farther down into the combustion chamber to raise the compression higher. LOL DK

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todd hamilton

10-26-2004 18:46:03




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 Re: Head Configurations--Power DC in reply to L.Lamp, 10-25-2004 19:16:54  
Dad's 41 SC had a propane head and it really added the horsepower. We pulled two 18s in 2nd with no problem. It would pull it in 3rd in most soils but the ground speed was too fast and it would not plow right. In very heavy red clay you had to shift into first but you had to hang on as the front wheels generally were about a foot off of the ground. In 2nd gear it would keep up with (or pass) Uncle Mike's IH 706 pulling five 14s and Grandpa's IH 656 pulling four 16s in the same furrow. And as I have stated on this board before, you kept the trip rope under your butt covered by one cheek or the other, but never in the middle!:^)

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CASEPOWER

10-25-2004 19:21:54




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 Re: Head Configurations--Power DC in reply to L.Lamp, 10-25-2004 19:16:54  
Your just getting more performance because the valves are not shrouded. Your much better off to use a Kerosene head then stroke it and bore it to get the compression up to 9 or 10 to 1. You will make good horsepower and not tear the main out.



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