Dual Stacks on a D

Joel Sanderson · May 27, 2020

I suppose you folks know by now that I'm in the first learning stage with my D. (To put it lightly.) I'm curious about something: I've seen quite a few Ds on U-tube that have had their horse power kicked up, and invariably one of the things done is to put dual stacks on them. Why is this? Does it breathe enough better to get more power from that way? Does it help it to run cooler? Like I said in an earlier thread, my D seems to run kinda warm when it's working--212º or so. Would it run cooler if I put two stacks on it? Who's making the manifold?

I wonder if anyone makes a question dart board for people like me. "Okay, I'll ask... THIS question this week."

Thanks again, fellas.

Joel

Mike M · May 27, 2020

I'm betting it is more like all those people who have to have those huge goofy looking stacks in the beds of their diesel pick ups !
Back when that tractor was made they were designed to run distillate fuel so they needed to run hot to burn it and also it has to have heat for the thermo siphon ( no water pump )system to work.

JL2510 · May 27, 2020

At one time when I would see those dual exhaust manifolds advertised they were claiming 10 or 12 hp increase. Ive never heard anyone verify that increase though for sure. Always seemed like a stretch to me, but I could be wrong too.

buickanddeere · May 27, 2020

The cold manifold with dual stacks and high compression gasoline or LP pistons will really wake up a D. Cam and followers will be worn and should be ground to match the pistons.

buickanddeere · May 27, 2020

Double D s look real good .

John Deere D · May 28, 2020

I googled John Deere D Dual exhaust Stacks......well see below.....only one of several suppliers...

Bob..

Joel Sanderson · May 28, 2020

That does seem like a lot.

Joel Sanderson · May 28, 2020

Thank you, Bob.

Joel Sanderson · May 28, 2020

Sounds over my head. I have no idea how to grind a cam. But I like the idea. I wonder if high compression pistons would make it start harder. Would the starter be strong enough
then?

buickanddeere · May 28, 2020

Open the compression release valves .

http://www.bulletcams.com/

http://www.berrycammn.com/

Joel Sanderson · May 28, 2020

Hey thanks for the links. I'll keep those on file. I'm not sure I'll be doing this next winter, but I'd like to.

I open the cocks when I start it now, of course. I suppose there wouldn't be much more compression with high vs low compression pistons when they're open.

Thanks for your input again.

Joel

Joel Sanderson · May 28, 2020

Yeah, I bet you're right; running hot was good then. Annoying that kerosene used to be so cheap and now it's so expensive. Doggone those jets anyway. Why can't people still travel by train and sailboat?

WeirdDeere · May 28, 2020

With your D running warm, I would be curious how hot it runs with straight water. Also, do you know the condition of the water passages. Rust and scale will keep it from cooling very well, I'd try flushing it, especially with something like cheap vinegar.

Dual stacks are made by Rosewood Machine Co.

One problem with dual stacks is the generator doesn't fit in the stock way. It would take some creative bracketing to make it work.

The Dual stack would make a little more HP but would be much better combined with gas pistons and cam grind, etc as the others said. While it would breathe better, and maybe more horses, that extra power would probably make it run even hotter.

I think I would look at your cooling system before worrying about anything else. Heck, try a different gauge, or check the one you have with boiling water. It could be wrong!

Brandon

buckeye al · May 29, 2020

If you're running a 50:50 mix of coolant & water you're likely to have trouble keeping his temperature down. A mix that strong in viscous enough it flows slower than water (fewer gallons per hour) and it doesn't hold as much heat per gallon as straight water. That's two strikes against it. The strong coolant is less likely to boil over but you'll have trouble keeping the gauge offa the right side peg if you work it very hard. Used to have that problem with a G and an A both. Plow all day just below 210 with water but both would be pegged on anti-freeze. With the thermo siphon systems I mix 'em for about -25 F. I've only seen -34 twice in my life here in western Ohio . They had slush in the top of the systems but it didn't freeze solid or cause troubles.

Joel Sanderson · May 30, 2020

Those are some very good suggestions. Thanks, Brandon. I didn't know that straight water would cool better. I assumed it was the other way around. I have a new gauge, and testing one with boiling water is a great idea.

Joel

Joel Sanderson · May 30, 2020

I did not know that too strong a mix would be harder flowing. That's good to know. I'll try less antifreeze and more water. It's good to hear you had this problem too and found an answer. Thank you very much

Joel

WGM · Jun 2, 2020

I think it’s a testosterone thing.

Joel Sanderson · Jun 3, 2020

Ha! I've wondered that myself.

Dual Stacks on a D

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