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Tractor Pulling Discussion Forum

JD G and a MSD

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ChadS

05-01-2008 07:10:06




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A "G" thats hard to crank, even with a gear reduction starter, and petcocks, Timing set at 17 degress, it was said thats where it made good power. So, it's a little cranky on spinnin over. Im wondering on if adding a MSD 6A box, and then adding the timing control, would help it start eaiser and take some stress of the starter? The timing control feature, allows the base timing to be changed, I think it was 7 degrees advance or retard off of TDC, was thninking it has a way to go a full 14 degrees one way, from TDC too.... Question is, on the timing control box, on the side it requires snipping a color coded wire for the number of cyls, and I cannot remember if it has a 2 cyl option,,,,, ,,,,, ,,,,, ,,, Could it be "fooled" by playing with the input signal, or maybe adding a magnet switch or crank trigger for it to get its pick up to do this kind of conversion?? Could it help get the G turning over if its possible? ChadS

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buickanddeere

05-15-2008 10:33:37




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 Re: JD G and a MSD in reply to ChadS, 05-01-2008 07:10:06  
The A,B,G,50,60 & 70 with the exception of LP. They spin the distributer at crank speed. They fire on the exhaust stroke as well.
Set the MSD or tach for four cylinder and away you go.
If the mechanical advance is working. It should be firing at TDC while cranking/slow idle and advance up to max advance by 1000rpm



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Gearnut

05-14-2008 17:59:23




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 Re: JD G and a MSD in reply to ChadS, 05-01-2008 07:10:06  
Chad, I tried a MSD Timing retard box once on a 454 and found it couldn't manage the spark properly at low rpms (cranking speed). Then again, that was 15 yrs ago. Perhaps they have improved their electronics



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ChadS

05-15-2008 08:00:57




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 Re: JD G and a MSD in reply to Gearnut, 05-14-2008 17:59:23  
Im wondering if the Triple pulse on the MSD cuts out and goes to a single pulse at the spark plug, at the higher rpms,,, they say thats what they do,,, So, I can see it throwing the timing way off, and maybe cut out and act up. MSD does smooth out the engine at idle, gives it a better flame front and can allow for better base timing setings too,,, Good example of this is a points distributor, then add electronic IGN, then add a MSD,, see if your idle speed increases and sounds alot smoother. If you had HEI, Im surprized you did not set the dizzy on fire!!! LOL!! Just an accel coil burned mine up one night in less than 20 minutes, and 10 miles from home,,, glad I kept the old cap/coil with me.

I had one on my 50 IH H,, mainly used it to knock a couple of HP out to get my tires dialed in with my motor,, but when the battery got low,, I knew I could turn that dial, and it would crank right over, then set it back to my marked position. it was a fun device, I used it while pulling, got some bad looks,, but it helped me go a bit further when used like that,,, ChadS

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Mike Langan

05-01-2008 14:43:11




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 Re: JD G and a MSD in reply to ChadS, 05-01-2008 07:10:06  
First thing to check is if the mechanical advance in the distridutor is working,
when you are setting the timing at what RPM are you setting it? 17 to 20 degrees at 1100 rpm is ok but at idle and for starting it should be closer to 0 How much compression?



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JDGnut

05-01-2008 16:51:35




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 Re: JD G and a MSD in reply to Mike Langan, 05-01-2008 14:43:11  
Which distbutor are you using.. if you have the stock dist.. its firing like a 4 cylinder.. if you have the LP dist (angle drive) its firing like a 2 cylinder... I use a tach set to the 4 cylinder position.. time control should be the same...
JDGnut

(We started at 22 degrees.. on the dyno. it ended up closer to stock..)



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jd b puller

05-01-2008 07:13:52




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 Re: JD G and a MSD in reply to ChadS, 05-01-2008 07:10:06  
Out of curiosity, pull the plug wires and see if it turns it over any easier.



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ChadS

05-01-2008 07:30:45




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 Re: JD G and a MSD in reply to jd b puller, 05-01-2008 07:13:52  
It was said the timing setting, kicks the starter back when its set for max HP. and it kinda fussy if its not at that spot under a load. Cam 2 for gas. Has power block with added petcocks too, Late G cam, with a stroker. I think the battery is still under the seat in its stock location,,, and maybe 2 12 volt ot two 6 volts with big cables might add a liite more snort? Its not infront of me, had a call yesterday,,, and was thinking on how to help it out. Could be as simple as a battery swap, or cables, but I think it still might lag at where the base timing is set at no matter, and maybe backing the timing off while cranking it by turning a little dial, and then when it pops off, set it back to the predetermined setting for the max output setting. Chad

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buickanddeere

05-15-2008 10:37:27




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 Re: JD G and a MSD in reply to ChadS, 05-01-2008 07:30:45  
The G,70,720 & 730 except for the first couple years of the G. All used the exact same cam lift & duration. No advantage at all swapping these 50 cams into a B, 620 cam into a A either.



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Trkr

05-01-2008 09:09:47




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 Re: JD G and a MSD in reply to ChadS, 05-01-2008 07:30:45  
By cranking a little dial,do you mean on the MSD box?If you have a dial on it you have a digital 6,not an AL. The digital 6 has a provision on it where it can automatically retard the timing for ease of starting on high compression engines.The digital 6 actually has 7 dials on it.



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Trkr

05-01-2008 09:12:40




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 Re: JD G and a MSD in reply to Trkr, 05-01-2008 09:09:47  
Forget what I just said,I reread and said you were using a seperate timing control box.I guess thats were your dial is.



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