Re: bubble top or cone top piston for a 730 jd die

Posted by buickanddeere on December 11, 2005 at 18:22:01 from (216.183.138.114):

In Reply to: bubble top or cone top piston for a 730 jd diesel posted by jimmy fletcher on December 11, 2005 at 17:48:32:

The 730 and part or all of the 720's used narrow spray pattern injector tips with six orifices. 13 mm injection pumps too. And the piston had a narrow but deep combustion chamber. I would have to check the parts book to be certain The 70, 80 and early 820's used a five hole, wide spray injector tip. And 10mm injection pumps. The piston had a shallow/wide combustion chamber.
Some vicious fights and flaming have occurred during discussions about using the wide pistons/narrow injectors or wide injectors and narrow pistons.
Those pistons would have to be pretty cheap and you should have somebody with a 70D looking for original pistons to sell them to.

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