Failed piston ring?
- Thread starter Kooldino
- Start date
No... this isn't on the bearing.. just the support surface. You are only removing a few 10 thousandths of an inch (less than 5 more than likely) and that is so fine and so little that I believe that an experienced builder like mine has no issues doing so. Yeah it's crazy stuff but the guy has been building performance motors for like 15 years... and he specialized in performance rebuilds... owns a Pantera tooBigg Tim said:
Ok, the bottom end is built and the head is on, but not torqued down yet.
Interesting thing while building the bottom end:
I was testing how the rod bearings felt by installing rods onto the crank UPSIDE DOWN.
I started with Cyl 4 (the one with the bad rod bearing). Installed it upside down, torqued it, and rocked it back and forth for awhile.
When I took it back off, there was a groove where the old one was really grooved. Great, that meant it was the crank pin.
I looked closesly at the crank pin, but could only barely see a faint line on the crank. I ran my fingers across it, but couldn't feel it.
So, under the advice of MPNick, I got some sandpaper and got busy.
400->800->1500 grit.
within a few hours, the line was almost totally gone. Reinstalled the rod with more new bearings. Torqued it down, rotated it, pulled it back off. Seemed like pretty normal wear at that point.
I inspected the other 3 with the same techique, although I sanded crank pin 4 (the second most beat up one) just a tad before I tested it. They all came up clean.
Interesting thing while building the bottom end:
I was testing how the rod bearings felt by installing rods onto the crank UPSIDE DOWN.
I started with Cyl 4 (the one with the bad rod bearing). Installed it upside down, torqued it, and rocked it back and forth for awhile.
When I took it back off, there was a groove where the old one was really grooved. Great, that meant it was the crank pin.
I looked closesly at the crank pin, but could only barely see a faint line on the crank. I ran my fingers across it, but couldn't feel it.
So, under the advice of MPNick, I got some sandpaper and got busy.
400->800->1500 grit.
within a few hours, the line was almost totally gone. Reinstalled the rod with more new bearings. Torqued it down, rotated it, pulled it back off. Seemed like pretty normal wear at that point.
I inspected the other 3 with the same techique, although I sanded crank pin 4 (the second most beat up one) just a tad before I tested it. They all came up clean.
Figured I should mention...
I sent my MP3 intake mani off to MAM to get extra injectors put in it. So in the meantime, I put on my spare ES intake mani...yup, with VTCS.
I didn't realize until after I had put it on, that they're going to stay closed all of the time, since the ECU can't open them (there are no wires in the harness). So, I kind of zip tied them open (which is damn hard to do when they're already installed in the car), and I'm hoping that they don't shut at random before I get my new intake mani on.
Anyone ever do this before?
I figured if it fails, I could somehow cut the pushrod from the actuator and zip tie it again since it would have no tension on it.
I sent my MP3 intake mani off to MAM to get extra injectors put in it. So in the meantime, I put on my spare ES intake mani...yup, with VTCS.
I didn't realize until after I had put it on, that they're going to stay closed all of the time, since the ECU can't open them (there are no wires in the harness). So, I kind of zip tied them open (which is damn hard to do when they're already installed in the car), and I'm hoping that they don't shut at random before I get my new intake mani on.
Anyone ever do this before?
I figured if it fails, I could somehow cut the pushrod from the actuator and zip tie it again since it would have no tension on it.
- :
- MP5T / 944
Great progress. Please post in bold what setting you finnaly use on the studs...
- :
- 2001 Mazda MP3
nice progress. pics? 
I guess, Dino is in his garage right now sitting under the hood. Sorry man! if I would know that I wouldnt go to restaurant on Saturday, I would bring Dimitri over on Sat. morning and we would finish everything by Sunday night, eh.
Wait...on second thought about the VTCS...
If the intake mani is OFF of the car, are the VTCS butterflies OPENED or CLOSED by default?
I torqued the head on at 84 ft/lbs. 84 ft/lbs was LESS than 16 ft/lbs with 90* + 90*.
Note to self: Buy an exhaust mani stud, stat.
If the intake mani is OFF of the car, are the VTCS butterflies OPENED or CLOSED by default?
I torqued the head on at 84 ft/lbs. 84 ft/lbs was LESS than 16 ft/lbs with 90* + 90*.
Note to self: Buy an exhaust mani stud, stat.
