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Milling a CA head

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Jim

04-22-2003 16:50:57




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Im thinking a shaving the head on my CA To gain some cheap horse power. Can anyone tell me how much can be milled off with out having valve clarence problems I belivemy engine is stock Thanks Jim




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Dick L Cutaway Head View PICTURES

04-24-2003 17:46:43




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 Re: Milling a CA head in reply to Jim, 04-22-2003 16:50:57  
Back up one picture to see cut out over firing chamber. The .200 thickness was measured where the water passes from the head to the block thru the head gasket. (no cut away at that point) The cut away sections has a measurement of .300. The thinner areas around the passages my be due to water swirling and washing the material away or could just be the way the sand was when cast.

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Jim Z

05-04-2003 13:38:25




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 Re: Re: Milling a CA head in reply to Dick L Cutaway Head View PICTURES, 04-24-2003 17:46:43  

I THANK EVERYONE for there help. I had the head milled 1/8 inch. It will be a wile before i know the results.But im looking forward to it.This tractor only gets used 2-50 hrs a year so if it dont work i just take a little less off the next head. Atleast i now have a starting point Jim



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Dick L

04-23-2003 14:03:57




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 Re: Milling a CA head in reply to Jim, 04-22-2003 16:50:57  
I sawed one of my old heads thru the center on the firing chamber to see how much I could safely mil off. I found that from the face of the head to the inside of the water jacket there was around .200 of cast iron. I milled about half of that which give me about .100 of metal between water and the face of the head. I was afraid if I took more that the head might crack. The inside of the water jacket is quite uneven and you can not get an exact reading. I would think they would be different from one sand casting to the next, yours might be thicker and you could get by taking more off. I was going to take pictures but have not as of yet. Might take a few tonight, the sun is nice and bright here.

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reub

04-22-2003 19:50:25




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 Re: Milling a CA head in reply to Jim, 04-22-2003 16:50:57  
You can safely take up to 1/8" off the head without any trouble if you stick to a flat top piston. The CA does have the combustion chamber in the head like the C. I have one CA that I pull with and another that I am rebuilding for pulling, its getting a D-14 block.
hope this helps



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DanD.

04-22-2003 17:15:59




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 Re: Milling a CA head in reply to Jim, 04-22-2003 16:50:57  
You won't gain any horsepower at all by milling the head. The head is flat and therefore compression ratio won't be changed at all by milling the head as in a car engine. The combustion chamber is in the dished pistons as opposed to being in the head..



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Steve in N.J.

04-23-2003 16:25:16




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 Re: Re: Milling a CA head in reply to DanD., 04-22-2003 17:15:59  
I had the head off my "B" milled .030 when I was doing the rebuild, to get it nice n' flat and hopefully to lift the compression a tic. She seems to "bark" when the coal is poured to her. I didn't do it to expect any big horsepower numbers here, I guess it's just the Hot Rodder surfacing in me... Steve/B&B Custom Circuits



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DanD.

04-22-2003 20:14:43




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 Re: Re: Milling a CA head in reply to DanD., 04-22-2003 17:15:59  
Even though I was reading CA in the post I was thinking WD45, etc. I have never had a CA engine apart and don't know how they are built on the inside. I think I worked too hard today. Sorry



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Eldon

04-22-2003 17:35:30




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 Re: Re: Milling a CA head in reply to DanD., 04-22-2003 17:15:59  

My C has flat top pistons....I thought the CA was the same??



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steve

04-22-2003 18:26:36




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 Re: Re: Re: Milling a CA head in reply to Eldon, 04-22-2003 17:35:30  
the B-C series is flat top, i thinkthe WC and WD were dish top. THE B-C has a small combustion chamber in the head for the valves and the plug. I dont know how much it can be milled. Original compression is only about 6 to 1 for the older style fuels. Raising this to 8 to 1 should help. Maybe Dick L. has some experience in this.



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