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ChadS
07-20-2005 07:42:41
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Re: John Deere 70gas bigger bore,,, in reply to buickanddeere, 07-20-2005 07:32:52
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we are going to cut them back quite a bit,,, may even lose the top ring,, I dont really want to see it much over 8 to 1 due tothe block being thin. Yeah found a few sets of those pistons, but want a million bucks for em, or it seems that way,, LOL! with all the stuff the 70 has,, duplex carb, and I think a little better cam than the older one had,, should be a strong ol 70. I think its going to get a electronic conversion for the ign,,, so that may help,,, you think it will run hotter than usual? nothing has been done tothe head, just rebuilt thats it,, new crank, etc etc,, it really ran good, but knocked,,, found the ring lands onthe pistons were shot and the rings were floating, and 1 cyl smoked pretty good,, it didnt do this at first when we first fired it up,, seemed to take bout 2 hrs running to create the problems,, but bad ring lands,,, so it probably held the oil from installation, and finally burned it all out and let the rings move more,,, Just going to cutthe top diameter of the piston to match up tothe 70,, gonna leave just a little in the center of the piston to make a little more compression,, before it had 100 and 85 psi on the compression,,, Chad
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