rod weight ?

BillK · 03-01-2015, 09:33 PM

Rod,

I typically try to make all of them the same. Most manufacturers of aftermarket rods and pistons say that if they are all within 2 grams they are ok, but it really only takes a few seconds more to make them the same so why not do it 100%

The only exception I make is with aftermarket "H" beam rods. I do not like grinding off any of the ribbing on the bottom of those rods. Sometimes you can take some weight off the sides but sometimes it is impossible to make them exactly the same.

That being said, are you having the crankshaft balanced ? All of the pistons and rods can be within a thousandth of a gram but that does not make a bit of difference if the crankshaft is not balanced to those weights.

Paul Precht · 03-01-2015, 10:29 PM

The motor will never notice it, if it bothers you though just have it corrected. Back in the early 70s when money was scarce for me I ran my BB Chryslers with unballanced parts and always turned them 7K in the lights, the motors ran as smooth as the ballanced ones.When I started working in a machine shop in the mid/late 70s I couldn't believe how out of ballance the stock BB Chyslers were. 4 grams is nothing to worry about IMO.

GTX JOHN · 03-02-2015, 03:18 AM

I agree with Paul.

03-01-2015, 09:33 PM	#1
BillK Member Join Date: Nov 2005 Location: Waldorf Md Posts: 230 Likes: 12 Liked 30 Times in 17 Posts	Re: rod weight ? Rod, I typically try to make all of them the same. Most manufacturers of aftermarket rods and pistons say that if they are all within 2 grams they are ok, but it really only takes a few seconds more to make them the same so why not do it 100% The only exception I make is with aftermarket "H" beam rods. I do not like grinding off any of the ribbing on the bottom of those rods. Sometimes you can take some weight off the sides but sometimes it is impossible to make them exactly the same. That being said, are you having the crankshaft balanced ? All of the pistons and rods can be within a thousandth of a gram but that does not make a bit of difference if the crankshaft is not balanced to those weights. __________________ Bill Koustenis

03-01-2015, 10:29 PM	#2
Paul Precht Senior Member Join Date: Dec 2001 Location: Elysburg, Pa Posts: 733 Likes: 361 Liked 327 Times in 121 Posts	Re: rod weight ? The motor will never notice it, if it bothers you though just have it corrected. Back in the early 70s when money was scarce for me I ran my BB Chryslers with unballanced parts and always turned them 7K in the lights, the motors ran as smooth as the ballanced ones.When I started working in a machine shop in the mid/late 70s I couldn't believe how out of ballance the stock BB Chyslers were. 4 grams is nothing to worry about IMO.

03-02-2015, 03:18 AM	#3
GTX JOHN VIP Member Join Date: Jun 2009 Location: Boulder City, Nevada 89005 Posts: 2,736 Likes: 2,808 Liked 2,488 Times in 698 Posts	Re: rod weight ? I agree with Paul. __________________ John Irving 741 Stock 741 Super Stock