Balancing your "built" rotating assy. here's why
Posted: Wed Jan 19, 2011 9:46 pm
I am building a 2.4L for my '95 NYG ACR Coupe. I've got Eagle Rods, and JE 10.5:1, .020 pistons, with a Balance Shaft Elimination.
I took everything down to my machinist in Niles, OH so he could bore the block, clean it, hone it, etc. I also gave him the pistons and rods. I told him to check them, see how close they are, and balance them if need be. He said sounds like a plan.
I got the call this afternoon, everything is done. Come pick them up! I jumped in the car and drove 3.5 hours to Niles, OH from Pembroke, NY to pick up my stuff. I get down there at 4:30pm and back into the shop to load up. The block looks fantastic! What he had to tell me, was a little unsettling, though.
He told me the Eagle H-Beam connecting rods, were within 3 grams of eachother. Not terribly bad. He was able to match them within about .1 grams of each other. He didn't have the before and after numbers recorded down for me, unfortunately...but I can see where he did some grinding/shaving on the ends of the rods to balance them up.
Then, he told me, my JE Pistons were all over the place too. This shocked me...considering JE is a high-quality piston. You'd think they wouldn't let them leave the facility without balancing.
Piston #1
Before:381.8 Grams
After:379.0 Grams
Piston #2
Before:380.6 Grams
After:378.9 Grams
Piston #3
Before:381.6 Grams
After:378.9 Grams
Piston #4
Before: 378.8 Grams
After:378.8 Grams
The wrist pins were exactly the same, each.
I'm glad I had my rotating assembly checked out. If there's one thing I cannot stand, is an engine that vibrates every nut and bolt loose in the car.
This is a fair warning to those of you who are doing engine builds...get your stuff checked out. It'll be worth it.
For less than $400...I got my block hot-tanked, cleaned, bored, honed, decked, pistons balanced, rods balanced, and new soft plugs installed. I can't complain.
I've had him do a lot of work for me in the past, and I've never been disappointed.
He does A LOT of work for the Mitsubishi Starion / Chrysler Conquest community over on www.StarQuestClub.com and www.26liter.us. He's a highly recommended individual. He goes by the name "Dad" on both of those forums. His name is Randy.
If your looking for someone you can trust..this guy is who your looking for. Just tell him I sent you. He knows me by username and my real name. His website is www.enginemachineservice.com.
Justin
I took everything down to my machinist in Niles, OH so he could bore the block, clean it, hone it, etc. I also gave him the pistons and rods. I told him to check them, see how close they are, and balance them if need be. He said sounds like a plan.
I got the call this afternoon, everything is done. Come pick them up! I jumped in the car and drove 3.5 hours to Niles, OH from Pembroke, NY to pick up my stuff. I get down there at 4:30pm and back into the shop to load up. The block looks fantastic! What he had to tell me, was a little unsettling, though.
He told me the Eagle H-Beam connecting rods, were within 3 grams of eachother. Not terribly bad. He was able to match them within about .1 grams of each other. He didn't have the before and after numbers recorded down for me, unfortunately...but I can see where he did some grinding/shaving on the ends of the rods to balance them up.
Then, he told me, my JE Pistons were all over the place too. This shocked me...considering JE is a high-quality piston. You'd think they wouldn't let them leave the facility without balancing.
Piston #1
Before:381.8 Grams
After:379.0 Grams
Piston #2
Before:380.6 Grams
After:378.9 Grams
Piston #3
Before:381.6 Grams
After:378.9 Grams
Piston #4
Before: 378.8 Grams
After:378.8 Grams
The wrist pins were exactly the same, each.
I'm glad I had my rotating assembly checked out. If there's one thing I cannot stand, is an engine that vibrates every nut and bolt loose in the car.
This is a fair warning to those of you who are doing engine builds...get your stuff checked out. It'll be worth it.
For less than $400...I got my block hot-tanked, cleaned, bored, honed, decked, pistons balanced, rods balanced, and new soft plugs installed. I can't complain.
I've had him do a lot of work for me in the past, and I've never been disappointed.
He does A LOT of work for the Mitsubishi Starion / Chrysler Conquest community over on www.StarQuestClub.com and www.26liter.us. He's a highly recommended individual. He goes by the name "Dad" on both of those forums. His name is Randy.
If your looking for someone you can trust..this guy is who your looking for. Just tell him I sent you. He knows me by username and my real name. His website is www.enginemachineservice.com.
Justin