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Tractor Pulling Discussion Forum

more power for stock G JD

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JLG

08-10-2003 15:00:02




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I have a 1950 G I pull in farm stock non-turbo, and antique classes. Problem is I can't keep up with the other G's around me and am not sure why. They aren't running power blocks and the block and head don't appear to be planned. I powered out in the 6500 class, they were spinning out in the 9500 class. I've heard of people doing some wild things to G's, but trust me thats not how it is here. These are stock pulls and you can tell that most are pretty close to stock by how they rate against manure covered tractors that also pull. Have to have stock motor (no major modifications, limit to .125 bored over) , no more than 10% over rpm and horsepower. I have to tear mine down anyway to fix a few leaks and fix the wobbly steering, so I might do some engine work while its apart. I was told that boring a 2 cylinder out .030 over would make a noticable difference, does this sound right? It made sense to me that the other G's would be overbored a little since they're restored. Also, what pistons should I look for? (LP, high altitude, etc.) I'd appreciate any ideas or advice. I've gotten a lot of information off these boards.

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2 Cylinder

08-11-2003 05:24:11




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 Re: more power for stock G JD in reply to JLG, 08-10-2003 15:00:02  
You want to look for a FLAT HEAD! That will gain you the biggest bang for your buck, it will cost you around $700-$1000 but will give you between 10-15 HP. Get a set of 125 over high compression aluminum pistons with a flat and you'll be in the neighborhood of 70hp. That is what I am running.



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buickanddeere

08-10-2003 20:33:18




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 Re: more power for stock G JD in reply to JLG, 08-10-2003 15:00:02  
Along with the previous info the ports on a G are very restrictive,turbulant,heated and already have high velocity. Match the manifolds/head ports oprnings. Install larger intake valves, a three angle valve job and blend the valve bowls smooth and clean . Several past posts here on low resriction aircleaners too.



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strecth da rods

08-10-2003 19:29:05




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 Re: more power for stock G JD in reply to JLG, 08-10-2003 15:00:02  
rebore block with m&w style pistons the cut and reweld rods about .400" longer. releive spark holes a little maybe even plane head alittle put some good gas in it and have some fun. P.S. I pull against a guy with this combo and he usually does better than my 508 inch g at 8 to 1 compression



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Bob

08-11-2003 08:20:06




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 Re: Re: more power for stock G JD in reply to strecth da rods, 08-10-2003 19:29:05  
Is it a common practice to legthen the rods on these tractors? Sounds to me like a recipe for disaster, but then again I'm probably not the best cook in the kitchen..... .



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JDGnut

08-11-2003 14:17:30




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 Re: Re: Re: more power for stock G JD in reply to Bob, 08-11-2003 08:20:06  
Bob.. It is a common practice when building a stroker to have the rods welded... You can have them made.. if you have the time and $$$$... I know a few tractors with the stock stroke that run welded rods for compression.. and to run a shorter piston.. and decrease some of the rotating mass.. Without using a different rod journal it is difficult to increase the stroke too much, because the rod bolts hit the top and the cam... Using a rod that has the rod journal cap cut at an angle allows for more clearance at the top.. If you recieve the Hook Mag.. Cuunningham Rods (www.cunninghamrods.com) has a good pic of a JD rod with the angled cut rod journal. I have built them with them using a stock or A rod.. but the stroke is just limited and lots of grinding for a short stroker.... JDGnut

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weld 'em

08-11-2003 14:39:50




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 Re: Re: Re: Re: more power for stock G JD in reply to JDGnut, 08-11-2003 14:17:30  
welded rods that are done properly will never give you a problem. there's guys with 800 cube engines running them with no problems.



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G-MAN

08-11-2003 13:56:31




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 Re: Re: Re: more power for stock G JD in reply to Bob, 08-11-2003 08:20:06  
It's just like anything else concerning engines and machine work. The right guy with the right equipment can do it and have zero problems, but some Bubba messing around in his garage could cluster them together with disastrous results.



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Brandon

08-10-2003 18:35:58




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 Re: more power for stock G JD in reply to JLG, 08-10-2003 15:00:02  
I had the same problem with mine in the 6500 class until I built it. The best thing to do to remain stock appearing is put in .125 over M&W style high-top pistons. I bought mine from Triple G Service. You can also mill the head up to .250" depending on how much it has been milled before. Another thing that would make a noticeable difference is to have the cam ground while you have access to it when you take the block off. Good Luck

Brandon

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bigger

08-10-2003 15:28:40




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 Re: more power for stock G JD in reply to JLG, 08-10-2003 15:00:02  
.030 won't make much difference at all. .125 over gas pistons will add a few horses. You can plane the G head and it's not really noticeable. .090 or .125 gas pistons and the head planed down until it starts to knick the eyebrow between the valves should get you about 60 horse. it'll run on 93 octane gas and still cranks fine with the stock starter and no petcocks.



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Tyler Neff

08-11-2003 11:38:15




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 Re: Re: more power for stock G JD in reply to bigger, 08-10-2003 15:28:40  
Ok here we go lets start by getting that stroke a little longer.Like 9.5 or even 9.75.Now take your bore to 63/8 or 7 if u have a power block (i got one i will sell ya).Go ahead and cut those rocker arms and get a Jerrys head and manifold .Some carb work will need to be done and some 18/38 rubber and u too can pull in that 9500# class too.Made it sound nice and easy to didnt I (ITS NOT).Figure on spending 1200 on that crank and 2000 on that head 1200 to 1600 on powerblock ,rods ,cam,rockers,time.I'll do it all for price,but it aint gonna be cheap.

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GUS

08-18-2003 10:44:38




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 Re: Re: Re: more power for stock G JD in reply to Tyler Neff, 08-11-2003 11:38:15  
DO YOU HAVE A POWER BLOCK FOR SALE????GIVE ME YOUR PHONE NO. THANKS gus



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Tyler Neff

08-20-2003 19:44:07




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 Re: Re: Re: Re: more power for stock G JD in reply to GUS, 08-18-2003 10:44:38  
(937)862-4598



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Stroker G

08-14-2003 19:40:06




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 Re: Re: Re: more power for stock G JD in reply to Tyler Neff, 08-11-2003 11:38:15  
Hey Tyler, Your from Xenia right? What happened to the 70 you were building about four years ago when you got rid of your G.



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Stroker G

08-22-2003 16:43:28




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 Re: Re: Re: Re: more power for stock G JD in reply to Stroker G, 08-14-2003 19:40:06  

Hey Tyler, What ever happened to your G? Where did it go?



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Tyler Neff

08-22-2003 20:56:21




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 Re: Re: Re: Re: Re: more power for stock G JD in reply to Stroker G, 08-22-2003 16:43:28  
It went to Pennsylvania 2 yrs ago Im not sure if its still there or not . I havnt heard anything about it since I sold it.I had to many projects going at one time.I was trying at the time to fit one of those new 7.5 G blocks in my other ride,but the castings were bad and i ended up screwing up the crankcase(thanks to Funderburks junk blocks).Since than Ive built a JD70 it was a little more difficult to tune but the end result was worth the effort.

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Tyler Neff

08-15-2003 11:07:45




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 Re: Re: Re: Re: more power for stock G JD in reply to Stroker G, 08-14-2003 19:40:06  
Its up and runnin.I had some problems with it in the beginning but its runnin pretty good now.Its around 745ci and makes around 110 to 115hp.I pull it in the 7500 8500 9500#classes. Gs & 70s do pretty good in the heavier classes.Plus it took merfeld about a 1 1/2years to get my stuff done.



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what did he do?

08-16-2003 05:46:12




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 Re: Re: Re: Re: Re: more power for stock G JD in reply to Tyler Neff, 08-15-2003 11:07:45  
what parts did merfeld do for you besides the crank?



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Tyler Neff

08-20-2003 19:49:49




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 Re: Re: Re: Re: Re: Re: more power for stock G JD in reply to what did he do?, 08-16-2003 05:46:12  
rods, rockers,all the head work,manifld(intake only)and all the block work .It took forever,but it all works great.



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