Hi All, Over the summer I had a valve seat fall out into cyl 2 and trash the piston, fortunately it was only at start-up and the pieces did not go far. The walls are pretty clean, and while I can barely catch a nail on the wall of a scar I believe I should be able to hone some of it out. I rebuilt the engine no more than 12k ago or so and I’d like to prevent another full rebuild if possible because it was running great and I’ve put enough money into this recently.
My Questions Are:
- Using (chromoly?) rings from the NPR piston set, What Grit Stones should I use for the process. I guess I am uncertain what these are made of, but it is the standard NPR pistons. (http://store.driftmotion.com/static/i-npr7m-gtepistonset.php)
- Do I need to do a multi-step process with two different grits?
- My engine was previously balanced. I’d like to balance it again but would need to remove one of the good piston/rods in order to weigh it because there is metal embedded into the bad piston from the seat coming apart. I’d like to know the likelihood of seeing success getting the rings back into the exact position they are in on this sample weight piston or if the risk of not being able to get them in perfect again would not be worth the effort.
Thank you for any advice you can offer. I’m looking to get some honing stones ordered and the process completed this winter so that I can get the motor back together for spring. I’ve never honed before but I built the engine with a friend ourselves several years ago.
Thanks to the Supra community for your continued help. Owning and modifying this car wouldn’t be possible without the people on these forums.
Craig
My Questions Are:
- Using (chromoly?) rings from the NPR piston set, What Grit Stones should I use for the process. I guess I am uncertain what these are made of, but it is the standard NPR pistons. (http://store.driftmotion.com/static/i-npr7m-gtepistonset.php)
- Do I need to do a multi-step process with two different grits?
- My engine was previously balanced. I’d like to balance it again but would need to remove one of the good piston/rods in order to weigh it because there is metal embedded into the bad piston from the seat coming apart. I’d like to know the likelihood of seeing success getting the rings back into the exact position they are in on this sample weight piston or if the risk of not being able to get them in perfect again would not be worth the effort.
Thank you for any advice you can offer. I’m looking to get some honing stones ordered and the process completed this winter so that I can get the motor back together for spring. I’ve never honed before but I built the engine with a friend ourselves several years ago.
Thanks to the Supra community for your continued help. Owning and modifying this car wouldn’t be possible without the people on these forums.
Craig
