Hello i bought this truck, its a 2002 7.3. i pulled it apart cause it was smoking. it had 2 broken piston rings that had wore a groove in the cyclinder wall. well i had to have the machine shop bore the block out to .040 over and one cylinder is sleeved now. my question is this. i already bought some used forged 7.3 rods. and the pistons are mahle with perfect circle rings. Now with this block having a sleeve and also being bored .040 over should i stay away from performace mods? i dont want a cyclinder wall distorting or somthing like the sleeve coming lose when i go and put a tuner and some injectors to it? any one have any experiance with this? thanks. you guys on this site have already helped me to diagnose the problem in this truck when i first got it and have been nothing but helpfull. mabey after i get this all togther and learn a little more bout deisels ill be able to put some input to some of these posts like mine. thanks again.
Jay
yeah .030 over didnt get it all. so .040 over was the only option it was either that or sleeve them all. the machine shop said hes done probly 10 or so over the years and that he has yet to hear of a problem with .040 over in these blocks he said the early 7.3s used to have problems with thin cylinder walls but that was obs 7.3.
I don't remember reading/seeing casting issues between obs and sd 7.3's. .040 over should be fine on a street truck. What power output are you looking for?
i dont plan on ever going more than 450 rwhp. i know that is a biiiggg number for a 7.3 but i will never go more than that i promise you that. ill probly stop at about 375 rwhp but who knows.
Im originaly from northern ok, right near ponca city. now im in the coast guard and get moved around every 3 or 4 years. at the moment im stationed in natchez, Ms. yeah i hear ya on the not going any higher than that hell i started out sayin i wasnt gonna go over stock but yall have changed my mind those dang videos of the black smoke drag racers get me goin. Heck i already purchaced some forged rods for this motor.
When they sleeved it did he bore a step in it to prevent the sleeve from sliding down? I've heard a lot of people have that problem when the sleeve doesn't have a step to rest on.
hahaha yeah i eat em taste dang good too. i dont eat em all mostley just runnem and let the dogs chace em up trees, just sonthin to do since i seem to get into way to much trouble doing anything else late at night. yeah he left about a half inch of the original bor on the bottom of he cylinder that the sleeve was pressed into, theres no posible way for it to slide out through the bottom and no way it could ever slide up cause the haed will be pushing down from the top. i was more concerned with the .040 bore makeing the cylinder wall so thin it might warp at high hp levels?
yeap there aint no money in it anymore it's just something fun to do, and you laugh but there use to be a time you could sell them in certain parts of a city.
shoot used to be... i get 6 bucks a pop and i dont even have to skin em. ill do it ever once in a while but mostly i like follin the dog through the woods at night. got a few families in town here thatbeg me to bring em back one every time i go they cant get enough of em.
At .040 you are probably going to have un-even cylinder cooling due to the differences in cylinder thickness with the sleeved cylinder. Depending on how much HP you want to run this may not be an issue. However I would NOT run that block with out measuring to see how thick the walls actually are. There is no telling how good a casting you have, so I would measure each cylinder for wall thickness.
I've seen more than a few blocks that I wouldn't trust at anything over stock power with the amount of material left in the bores after a .040" overbore. Not only is cooling an issue but the cylinder wall ovalling (particularly on the thrust side) causing ring seal problems and is only compounded by using such an engine in a performance application.
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