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Tractor Pulling Discussion Forum

6 cyl distributor rebuilt

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Chads

01-11-2004 18:58:53




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I took the distributor off the 460H today, and cleaned it up, and went through it to make sure it was in good shape. The engine has a miss in it that I have been tracking down, It stutters when I accelerate the rpms. then smooths out. I found the tab on the rotor had a hole burned through it, and the mechanical advance was sticking. I did replace the mechanical adv, springs, put in lighter ones. I know it helped the H, hope it will help the 6 cyl too. The book says to set the timing at full throttle, at 25 deg adv. I found it interesting that the engine timing had to be set that way, Even though I set the timing with the dyno, but most books say to set it while the engine is idleing. Why the different method to set the timing on the 6 cyl? Also,, when running higer rpms on these 6 cyls,, (under 3000) Should I change the plug gaps for a higher rpm, or leave it alone. It will have a MSD, and points for right now,, Just trying to hunt down the stutter in the engine. Running 89 octane pump gas, I am running a Champion platinum truck plug, #4130, it has a long electrode and moves it closer to the center of the chamber. I have not got it running again yet, Later,, Chad

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Wild Horses

01-12-2004 10:22:34




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 Re: 6 cyl distributor rebuilt in reply to Chads, 01-11-2004 18:58:53  
I haven't heard about the trick with the lighter springs. What does it gain you? Throttle response?
I agree with Paul I would check to carb settings. A stuttering throttle response can be a hard thing to track down. Usually it's a balancing act with the carb & timing settings. Not a bign fan of Champion either. But hard and more expensive to find alternatives. Most autoparts stores around here only carry Champion tractor plugs, especially hotter ones.

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Have a look at this,, Cha

01-12-2004 11:11:03




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 Re: Re: 6 cyl distributor rebuilt in reply to Wild Horses, 01-12-2004 10:22:34  
well, on the springs on the H-M, It speeds up the ignition timing advance. What I mean by this is it does not change the degree of timing, it changes how fast the timing changes in the engine. Yes,, you pick up throttle responce by doing this. I have not tried this on the 6 cyl yet,, I installed the springs and rebuilt the dist, but have not ran the engine. It does work with the 4 cyl though. My theory on the dist springs is this,,,,, When you increase compression or change the engine to enhance performance,, the enginie will rev up faster,, everything needs to operate faster. Lets say by building a stroker, and dyno tune it, and just peak the HP without changine the internal parts,, like the governor spring, or carb jets, etc,, and leave it stock,, yes the engine will be stronger, but will still operate in a stock mannor,, usually slow and sluggish on throttle responce, If you change the internal structure of the engine, why not modify the engine controls as well? That is why when I dyno tune an engine,, I keep finding all this "Magic" Horsepower,, I change, and set up the engine not to run in a stock mannor, Most people belive that a carb will solve all of their problems, That is ok to a certain extent. But like I said,, why stop at the carb when building a puller?? The ignition is just as important to modify, as a carb or strokers. Every little bit of modifications help!!! Don't be afraid to test and tune.. I learned this when building engines, and drag racing. I hope this helps any one who reads it,, Chad

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WIld Horses

01-12-2004 12:26:20




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 Re: Re: Re: 6 cyl distributor rebuilt in reply to Have a look at this,, Cha, 01-12-2004 11:11:03  
Sounds like something to try. That's alot of what we do. There's 4 or 5 for us who haul together and we spend most summer weekend evenings monkeying with our tractors. Everthing from playing with governor weights to altering rockers. We don't have a dyno though, just have to go by ear until we can test it on a track, or plow, or even pulling a buddy's old Cabover. Thats shade-tree machanicing at it's best.

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ChadS

01-12-2004 13:30:03




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 Re: Re: Re: Re: 6 cyl distributor rebuilt in reply to WIld Horses, 01-12-2004 12:26:20  
Nothing like a nice shade tree, a few friends, a couple of old tractors, a case or 2 of Budwieser, and a toolbox!! That is a combination for fun that will last until the beer is all gone!!! ChadS



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Paul

01-12-2004 04:51:13




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 Re: 6 cyl distributor rebuilt in reply to Chads, 01-11-2004 18:58:53  
I think the reason you set the ignition timing at high RPMs is so you set it with at 'full advanced' timing. To get the most power possible, you want to set the timing as advanced as you can without detonation. Is there a possibility you could be running a little on the 'lean' side? That can cause hesitation during acceleration. I have not had much luck with Champion spark plugs, and would highly recommend the Autolite Racing spark plugs. If your engine normally uses C59YC plugs, the Autolite equivelant is AR3910. Here is a link to the Autolite Cross Reference chart:

Link

Best of luck, Paul.

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