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Tractor Pulling Discussion Forum

4020 Heads

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4020 Puller

01-01-2006 22:03:57




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I run a 4020 in stock 7500 through 9500 pound classes running 3300 rpm and I am just looking to get the most out of this engine without adding a turbo. The main thing I am interested in is porting the head and intake. Does anyone know anything about how intake ports in the head should be shaped. I've done a lot of work on chevy and other gas engine heads but dont have any experience with diesel engines. I've heard that the intake port is designed to swirl the air coming into the cylinder. It looks to me that this design does allow much air at all to flow. I practiced on a junk head a it looks that you can really enlarge and straighten out the intake runner. Will this actually hurt performance? Can you make the ports too large? Any help will be greatly appreciated.

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JDGnut

01-03-2006 20:17:17




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 Re: 4020 Heads in reply to 4020 Puller, 01-01-2006 22:03:57  
Can you run a 55 series head?? They flow a ton better.. but you have to make some other changes for it to fit..
JDGnut



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G/MAN

01-03-2006 15:37:03




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 Re: 4020 Heads in reply to 4020 Puller, 01-01-2006 22:03:57  
I don't think port shape is as crucial on a diesel, as you're drawing in only air on the intake stroke. On a naturally-aspirated diesel, my theory would be the bigger the better on the ports, but I could be way off base on that one. On a gas-burner, you have to pay more attention to port size and shape so that the port doesn't get "lazy", which can cause the fuel to fall out of suspension. I tend to wonder about the info you received about "swirl" for the same reason - why is swirl so important in the cylinder when all you're bringing in is air, with the fuel to be injected later? Swirl is important in a gas-burner since once again, it keeps the fuel-air mix stirred up until compression occurs. Since you have a junk head to play with, I'd experiment with varying shapes and sizes and compare results on a flow bench. I'm sure there are sites detailing how to build a homemade flow bench. I haven't done what you're talking about, but the first place I'd look at improvement would be the areas directly around the seats, and there are probably big gains in flow to be made by using different valves with smaller stems in the port area and smoother profiles on the back side. You might consider contacting some of the big-time diesel builders (Scheid Diesel, etc.) to get their thoughts on this, although most of them tend to play with turboed engines.

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