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Case Tractors Discussion Forum
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730 diesel to gas

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jaker2

12-22-2006 02:58:12




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I was wondering if the 730 diesel and the 830 gas motors can be combined into one. The reason for asking is I have a good running 830 gas (284 cu in) engine that needs the heads redone, and I have a 267 diesel 730 that needs new sleeves and pistons. I do know they use the same crank. but I was wondering if I could simply put the diesel cam in the gas engine and bolt the heads off of the diesel onto the gas block and bolt on the diesel system on and have me a 284 diesel?
What are the pros and cons of this?

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4435

12-22-2006 06:23:47




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 Re: 730 diesel to gas in reply to jaker2, 12-22-2006 02:58:12  
My convoluted combination is a set of diesel pistons and sleeves with a set of gasoline heads. Tom



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Triplerange

12-22-2006 05:01:31




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 Re: 730 diesel to gas in reply to jaker2, 12-22-2006 02:58:12  
The compression of a gas is around 8:1 and the diesel is at 15:1. I don't think it's going to work either way.



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TexasWren

12-22-2006 04:42:53




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 Re: 730 diesel to gas in reply to jaker2, 12-22-2006 02:58:12  
Wow. My first impulse would be to say "not likely," but I've seen stranger things work. I would think the diesel pistons are a lot sturdier in the crown, since the compression ratio is more than double, so running a gas engine piston in a diesel might give you ventilated pistons (assuming it gets enough compression to fire at all -- you'd have to crank it and see if you're getting the 220 PSI you need). Then again, even gas engine tractors are massively overbuilt, so the pistons might be more than sturdy enough. Looking at the front, I'm not sure if the injector pump would bolt up. It looks close, but again ...

I'd love to hear what people who know more about it than me have to say.

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B. Jones

12-22-2006 04:39:01




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 Re: 730 diesel to gas in reply to jaker2, 12-22-2006 02:58:12  
The diesel pistons and gas pistons are different. I'm almost sure it would not have enough compression to start. Also the gas pistons would not be strong enough even if it would start. There may be more issues, but the different pistons I know would be a major issue. Someone else may add in a lot more than I don't know about. B. Jones



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Jaker2

12-22-2006 06:10:05




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 Re: 730 diesel to gas in reply to B. Jones, 12-22-2006 04:39:01  
The diesel and gas motors us the same rods and have the same crank. Also the pistons come to the top of the sleeve the same distance. To me it would seem that the thickness of the top of the pistons wold have to be the same. Is the comp ratio not made up in the head? I know for the 730 after market kit they offer a 4 1/4 bore which is what a 284 is. I am still thinking



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TexasWren

12-22-2006 19:58:29




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 Re: 730 diesel to gas in reply to Jaker2, 12-22-2006 06:10:05  
Yeah, it's because the pistons come up the same height that I'm wondering, too. I know looking at the parts catalog, the pistons are all flat, which is why I said you might have to bolt up a head and find out how much compression it actually makes. Won't the combustion chamber be sized for the smaller pistons though? I know, it's only a 7% difference in area, but I've cracked heads (on a car engine) with less difference than that (just the thickness of a base gasket, actually).

You might end up with actually a little HIGHER compression ratio than you want. But maybe you could make that up with a thicker head gasket? I'm still skeptical about the bolt-up of the injection pump. Sounds like an interesting experiment, anyway!

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