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John Deere G Spark Plugs? Aluminum Pistons?

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Chad

04-27-2004 09:23:16

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I'm building up a 1948 JD G for local pulling. So far I've got her at .125 over, added a Jerry's cold manifold, a Robert's Pulling Carb, a hot coil mag, and a straight pipe. What spark plugs should I run? Does anyone have an idea what a set of used, standard bore, High Compression Aluminum Pistons are worth for a G? They're in great shape and I don't need them. Thanks for any help.

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BUD BARENIE

04-30-2004 03:17:06

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Re: John Deere G Spark Plugs? Aluminum Pistons? in reply to Chad, 04-27-2004 09:23:16

HEY CHAD !!
PUT A PROPANE HEAD ON AN (M) DIDN'T KNOW OF AN (M) EVER COMING OUT WITH PROPANE. MOST CLUBS WON'T ALLOW THAT !!!HOPE THAT HIRED HAND AIN'T PULING IN OUR CLUB

LOL

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JDGnut

04-27-2004 21:40:43

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Re: John Deere G Spark Plugs? Aluminum Pistons? in reply to Chad, 04-27-2004 09:23:16

I would use the REAM adaptors.. If you change the plugs more than once, it will pay for the cost of the adaptors... They will come with a list of plugs to use.. If you do not use the adaptors I would use the Autolites 386's.. (You can get them at your Deere Dealer.) HP will depend on the compression.. without any milling of the head the compression ratio should be about 6.5-6.75 to 1... Which carb from Roberts did you get?? The super 51??? JDGnut

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Chad

04-28-2004 08:06:50

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Re: Re: John Deere G Spark Plugs? Aluminum Piston in reply to JDGnut, 04-27-2004 21:40:43

I got the Super 51. I'm running out of time (4 weeks) until the first pull, so I'm not going to have the cam done right away. Hopefully that carb still makes a big difference. I've heared good things...

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520-LP

04-27-2004 17:59:48

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Re: John Deere G Spark Plugs? Aluminum Pistons? in reply to Chad, 04-27-2004 09:23:16

Chad I just finished a 1952 G with .125 over m&w style pistons,cam work straight pipe,MSD-6T with 40,000 volt coil.I used champion D23 gap set at .050 starts on the first roll over and sounds awesome.

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ronjohn

04-27-2004 15:44:25

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Re: John Deere G Spark Plugs? Aluminum Pistons? in reply to Chad, 04-27-2004 09:23:16

hey chad,
i am doin the same thing to my G, let me know what it reads on the dyno would ya, thanks,

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Chad

04-28-2004 08:09:39

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Re: Re: John Deere G Spark Plugs? Aluminum Piston in reply to ronjohn, 04-27-2004 15:44:25

I'll let everyone know by the second week of June. I've got a pull on June 6th and I'll be spending a lot of time on the dyno.

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puller

04-27-2004 13:48:03

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Re: John Deere G Spark Plugs? Aluminum Pistons? in reply to Chad, 04-27-2004 09:23:16

I would be interested in them pistons for the right price....we use champion D21's and D23's in all our pullers.

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Chad

04-28-2004 08:17:34

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Re: Re: John Deere G Spark Plugs? Aluminum Piston in reply to puller, 04-27-2004 13:48:03

Puller, Just let me know what you want to spend and I'll get back to you. I was going to put them on the For Sale Ad board today, but I'll wait for your reply. They're in really nice shape. Besides a little carbon on top they look just like my new ones. I'm sure we can work something out. Thanks for the reply.

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puller

04-28-2004 11:38:02

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Re: Re: Re: John Deere G Spark Plugs? Aluminum Pi in reply to Chad, 04-28-2004 08:17:34

to me..there not worth prolly over 150....since there used and we have another set for the time being, but if I had another set, i got another block to bore too....I was jsut thinking ahead..lol

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JohnDeere_John

04-27-2004 13:32:59

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Re: John Deere G Spark Plugs? Aluminum Pistons? in reply to Chad, 04-27-2004 09:23:16

Chad, I use autolite 388 in my G with almost the same specs your quoating. You see my G every summer in the club. Does the pulling carb add much over stock?

Jon from Hebron

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Chad

04-28-2004 08:34:20

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Re: Re: John Deere G Spark Plugs? Aluminum Piston in reply to JohnDeere_John, 04-27-2004 13:32:59

I talked with Robert at this years Gathering of the Green in Moline and he stands by it. He told me straight up that it makes a huge difference on the big cube G's. He said that it will increase airflow by about 28% and up to 22% horsepower gains. It looks really good, so I can't wait to bolt it on and fire her up. Like I said earlier, I'll let everyone know what she dynos once I've got her throwing dirt on those M boys! One of our hired hands just put an LP head on his M that took the compression from 115 psi to 225 psi. We'll see what happens for both of us really soon because neither runs yet. Give me about five weeks. Thanks for the reply.

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puller

04-28-2004 11:46:37

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Re: Re: Re: John Deere G Spark Plugs? Aluminum Pi in reply to Chad, 04-28-2004 08:34:20

what is so different in the super 51 as the plain big nut 51?

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JDGnut

04-28-2004 19:07:32

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Re: Re: Re: Re: John Deere G Spark Plugs? Aluminu in reply to puller, 04-28-2004 11:46:37

He bores the carb, with bigger butterflies.. I'm sure there are other little differences.. but is the most noticable..

It will be interesting the dyno... I have one.. one of these days I'll put it on a stock cube G and see if there is much difference at the stock cubes... JDGnut

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puller

04-28-2004 20:43:12

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Re: Re: Re: Re: Re: John Deere G Spark Plugs? Alu in reply to JDGnut, 04-28-2004 19:07:32

i'd be interested in the results....thanks alot....puller

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here it is

04-27-2004 10:50:37

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Re: John Deere G Spark Plugs? Aluminum Pistons? in reply to Chad, 04-27-2004 09:23:16

I've had good luck with C88L or C86 AC's. I think the C86's have been discontinued now though and replaced with C87's.
The pistons...maybe $200+? That's a shot in the dark.

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