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7040 
Orange Level
Joined: 11 Aug 2013
Location: newglarus wi
Points: 418
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 Topic: 426-466
Posted: 31 Dec 2013 at 11:02pm |
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im looking into machining cost ect ontaking a 426 to 466 for a box turbo class (2.4) machinest recommends boreing versus stroke =cheaper and can put bigger valves in in future I have heard good arguments both ways bore versus stroke just looking for opinions the class will also be stock appearing turbo 2800rpm or 3000rpm depending on club water inj is also allowed no intercoolers thanks in advance also if it matters weight is 10500 to 13500 depending on town
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injpumpEd
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Joined: 13 Sep 2009
Location: Walnut IL
Points: 4917
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Posted: 01 Jan 2014 at 7:52am |
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I prefer to get the 426 to 468 by increasing the stroke. You can use all stock parts, head gasket plus fire rings, sleeves, and pistons, just machined off the top, and valve reliefs cut in top. The big bore setups to me are less convenient. Custom sleeves, custom pistons, special head gasket, and rings for whatever the piston was initially from. At 3000 rpm, and a limited turbo size, larger valves aren't going to gain the torque that the stroked crank will. Big valves, and big bore/short strokes are for higher rpm combinations. I have a local machinist buddy of mine, that has our piston design saved in his cnc.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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O.P.S. Heads
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Joined: 02 Jan 2013
Location: Iowa
Points: 574
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Posted: 02 Jan 2014 at 8:35am |
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I agree with Ed. Have a crankshaft welded up into a stroker and you can use all AC parts over again. Machine the tops of the pistons to get the compression ratio you want and re assemble. Easier and probably less costly than an overbore set up. Stock sized valves with a nice cylinder head port job.
What do they mean by "stock appearing turbo"? That's a new one to me.
Edited by O.P.S. Heads - 02 Jan 2014 at 8:37am
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scott
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Joined: 12 Sep 2009
Location: michigan
Points: 2586
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Posted: 03 Jan 2014 at 3:05pm |
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How much extra stroke does it take to get to that 468 ci?
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DrAllis
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Joined: 12 Sep 2009
Points: 20548
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Posted: 03 Jan 2014 at 4:26pm |
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5 1/2" stroke....add 1/2" or maybe .490" for 466..........I don't have a calculator in front of me.
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injpumpEd
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Joined: 13 Sep 2009
Location: Walnut IL
Points: 4917
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Posted: 03 Jan 2014 at 8:39pm |
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an even half inch, (5-1/2") calculates to 468. Most classes allow for a 1-2% variance. It's just a nice even number to work with.
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210 "too hot to farm" puller, part of the "insane pumpkin posse". Owner of Guenther Heritage Diesel, specializing in fuel injection systems on heritage era tractors. stock rebuilds to all out pullers!
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