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Tractor Pulling Discussion Forum

Jd A not running right?

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Jasonjda

09-14-2004 05:06:33




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I have a JD unstyled a 8 3/4 stroke 70 lp gas pistons, Jerry"s head and manifold, worked over late A carburator,and 630 lp gas distributer with electronic ignition. My problem is when just sitting there running at any speed number 2 cylinder,when the petcock is open, just sits there and kind of sucks in and blows a little out, now if I unplug number 1 the motor will load up as it should and then it will make fire and blow out like number 1 will all the time. When I pull with it,it pulls strong and it does not act like it is running on one cylinder. My question is, is this normal or what is causing it, I have changed the plugs several times and checked the spark plug wires.

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Big A puller

09-14-2004 21:45:45




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 Re: Jd A not running right? in reply to Jasonjda, 09-14-2004 05:06:33  
While yes it is normal for the single carbed two bangers to run better on number one, that isn't the problem. I've been pulling big cube two cylinders many years, been around them even longer, and have yet to not be able to get them to run smooth at both idle and load. The problem is the head. Though I've never seen your tractor, I'm willing to bet that it runs worse at idle than most every other two cyilnder, but under load it will just purr, right? We had a similar setup on an A slightly bigger on the bore and stroke than you and that is exactly what it did. Regardless of any fine tuning, carb adjustments, fuel types, spark plugs, you name it we tried it, it would run on basically one cylinder until under a load. We finally went back to a heisler, problem solved. It ran smo other, and in fact, I think it pulled better too. The Jerry's A head is just not flowed right, too big. They work all right on Gs, but not on As.

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Jasonjda

09-15-2004 08:32:36




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 Re: Jd A not running right? in reply to Big A puller, 09-14-2004 21:45:45  
That is not what I wanted to here considering what the head cost!! It makes sense to me what you are saying but it pulls so well now, I might just let it go if there is nothing I can do about it. Maybe I should just go bigger with the bore and stroke to compensate!!
By the way I appreiceate all the replys, if anyone has corrected it successfully I would love to here about it.



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Drew

09-15-2004 10:32:41




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 Re: Jd A not running right? in reply to Jasonjda, 09-15-2004 08:32:36  
Don't give up on it yet. I know its yet more money to spend on it, but you can have that head fixed and help it out some. If you throw 600+ci behind that head, it will start to work good. Even w/ the bigger engine, it still needs to be worked on. More carburator will allow more air into the intake runner and increase air velocity.



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Jasonjda

09-15-2004 11:13:50




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 Re: Jd A not running right? in reply to Drew, 09-15-2004 10:32:41  
So should I look for a big nut G carb, I figured that would be to much for what I have, but this hotrodding a two cyl is still new to me. Thanks again



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Drew

09-15-2004 15:53:35




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 Re: Jd A not running right? in reply to Jasonjda, 09-15-2004 11:13:50  
From everying I have heard, you can do just about as much to a DLTX 71 as a DLTX 51. While the carb would help, what would probably help more is getting that head on a flow bench and getting the intake runner fixed. What are you running for a camshaft? When pulling, does this tractor have any torque at all under about 900 rpm, or does it fall flat on its face around that rpm?



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Jasonjda

09-16-2004 05:26:38




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 Re: Jd A not running right? in reply to Drew, 09-15-2004 15:53:35  
I got my camshaft, crank, rods and pistons from schooler, I don't have the specs handy but I can dig them up. It does have some torque at low rpm, not as much as one might think, but I attribute that to the big head, and camshaft, much like oval port vs. rectangle port heads on a big block Chevy. It definately does not fall on its face, but I have a mild JD 60 that has way more torque. Do you have any suggestions for the carb and who to flow the head? The Carb is a Denny's pulling carb (I know, but it was slighty used and a good deal when money was tight), it seems to work perfectly under a load. How much correction is generally needed on the Jerry's head.

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Drew

09-16-2004 18:58:58




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 Re: Jd A not running right? in reply to Jasonjda, 09-16-2004 05:26:38  
Shoot me an email.



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Drew

09-16-2004 18:58:54




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 Re: Jd A not running right? in reply to Jasonjda, 09-16-2004 05:26:38  
Shoot me an email.



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G-MAN

09-14-2004 13:53:00




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 Re: Jd A not running right? in reply to Jasonjda, 09-14-2004 05:06:33  
Mike is correct. At idle speeds, a single-carbureted two cylinder will tend to lean out and miss on the #2 cylinder, because the #1 hole gets the bulk of the fuel/air charge. As speed and load increases, intake velocity also does, and the carb can do a much better job of feeding both cylinders. Some guys intentionally run their idle mixture too rich to compensate. Two-barrel carbureted Deeres such as a "60" idle much more smoothly, because each cylinder has it's own barrel and idle circuit in the carburetor.

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Jasonjda

09-15-2004 08:42:31




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 Re: Jd A not running right? in reply to G-MAN, 09-14-2004 13:53:00  
It runs on only number one at all throttle speeds unless under a load (pulling, driving,etc.) It will run partly on number 2 which makes the "popping johnny" sound. If I unplug number one spark plug wire it will run constanly on number 2, it also will foul the number 2 plug more quickly than the number one under normal use. We have several 2 cyl. jd's and this is by far the worst at doing this. It just makes me wonder because I was at a pull with an A I know is very similar to mine with the same head and ignition and his does not sound the same, it sounds as if it is running correctly on both cyl.

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G-MAN

09-15-2004 13:56:51




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 Re: Jd A not running right? in reply to Jasonjda, 09-15-2004 08:42:31  
Do a compression check with the engine warm and check the valve lash.



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Jasonjda

09-16-2004 05:31:48




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 Re: Jd A not running right? in reply to G-MAN, 09-15-2004 13:56:51  
I will try to check it this weekend, I did susspect the valve lash before and it was a little tight, corrected it, but it didn't make a noticable difference. I will check them both again, with my combination what do you think my pressure should be? Again, thank all you guys for the help,It is great to know I have a place to get some answers!!



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ChadS

09-15-2004 07:26:31




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 Re: Jd A not running right? in reply to G-MAN, 09-14-2004 13:53:00  
Too low of vacuum through out the head. Loses its ability to draw the charge through the carb to the cyl. Right? Would a smaller cfm carb help give it back some vacuum pressure and more to #2? ChadS



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Mike N Mo

09-14-2004 05:45:52




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 Re: Jd A not running right? in reply to Jasonjda, 09-14-2004 05:06:33  
It's normal. When it's at an idle the throttle plate is closed and very little air is getting into the engine. With the 540* then 180* firing order the #1 cylinder can draw the air in the intake runner to run on, but the #2 cylinder that follows 180* later doesn't have as much air to draw because the #1 cylinder just got it all. Hope this explains it. Mike



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