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Going tractor pulling with a 6, need advice on building??
https://www.slantsix.org/forum/viewtopic.php?t=7988		 Page 1 of 1
Author:  Sassy Massey [ Fri Jan 02, 2004 9:21 pm ]
Post subject:  Going tractor pulling with a 6, need advice on building??
Hi everyone, first time here, love the site! We are building a tractor for the pulls, and we are planning on a slant 6 for power, before I start on it, of course I want to gain all the info I can first, what rods, head, block, etc, etc. We need a motor thats going to run in the 5500 rpm range, it will have tuned dual upright headers, most likely sidedraft carbs, probably running on alcohol. Basically this thing has to be built similar to a drag motor, so to get things started on our plan of attack, would you guys throw me some ideas, thanks alot in advance!! :?:
Author:  XECUTE [ Sat Jan 03, 2004 1:15 am ]
Post subject: 
I have no direct experience with what you are doing, but am aware that the Weber DCOE45, or DellOrto 48DHLA carbs are able to be converted to alcohol by increasing jet sizes. The 2 bbl x 3 intake manifolds do exist, but they are thin on ground new. In Australia, John Cain used to make them.

The advantage of using the independent runner Weber/DellOrto set-ups is that the intake mixture can pulse tune, and this is very benificial to mid range torque and high end power.

Any steel crank will sufice, but I'd worry about 5500 rpm constant unless you considered custom alloy rods.

The cyclic load of the forces from the piston create an inflection point on all cranks which miss out on intermediate support. In Britan, David Vizard found that Mini Cooper S cranks flex quite a large amount. The solution was to up-size the main and crank pins, and use another kind of larger bearing on the crank tunnels. On a slant, you'd never be able to justify the expense of going that far.

The crank is the issue. The cost isn't that much for a good stock steel crank. There are some guys forming a consortium to buy new billet or forged cranks.

The crank is the only issue. It's a fact of life with slants, but the rest of the engine is really stout. If your finances can stretch pirating a foriegn Ricer piston in the 87 to 88mm mark, with a very short compression height, you could make some very light recipricating components with alloy rods up to the 6.8 to 7 " range. This may take a lot of load off the crank.
Author:  Doctor Dodge [ Sat Jan 03, 2004 7:06 am ]
Post subject: 
Xecute has the right idea, build a strong & well balanced bottom end then find a way to get a lot of fuel thru it. You may want to build a "long rod" 225+ for this.
As for some more specific information, give Doug Chalupa a call. 319-653-4234
Doug has run pulls with a SL6, in fact, he was selling his rig a while back.
DD
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Author:  Tim Keith [ Sat Jan 03, 2004 6:31 pm ]
Post subject: 
you might go to www.inliners.org, some tractor pullers post over there
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