rod/piston assembly weight

Earle Holt · 09-13-2010, 01:55 PM

Where do I find the minimum weight for a rod/piston assembly for my combo? Does the weight include rings and bearings?

Thanks,
Earle

Alan Roehrich · 09-13-2010, 02:04 PM

I think it is in the accepted replacement parts list in the competition section. It includes rings, but not bearings, since you can easily remove the two bearing shells from most connecting rods, and also the bearings would have different weights depending on how far the rod journal has been ground undersize.

Cam · 09-14-2010, 01:30 AM

I think this is what you are looking for.
http://www.nhra.com/competition/pistons.aspx

Earle Holt · 09-14-2010, 07:04 AM

Thanks guys, I appreciate it. Looks like weight does not include bearings and rod bolts.

Adger Smith · 09-14-2010, 09:27 AM

It may not be clearly stated, but I think you will find that rod bolt weight is considered part of the rod weight. All that is important is the correct parts/part numbers and the correct assy. total weight.

Alan Roehrich · 09-14-2010, 09:52 AM

Adger is correct, all rod fasteners are included, the total weight of the rod includes the fasteners, they put the rod nuts back on, or the bolts back in, before they weigh it. They only leave the bearing out, and for the reasons I gave.

Earle Holt · 09-15-2010, 09:04 AM

Thanks everyone. I appreciate it.

Adger Smith · 09-15-2010, 09:49 AM

Earle,
Another point that is clear as mud is the pin locks. You will find that "If" a piston is actually run press fit on the rod no locks are figured in the piston weight. If it is floated and pin locks are used they are considered part of the piston weight and are included in the total assy weight. Don't forget about them.

09-13-2010, 01:55 PM	#1
Earle Holt Member Join Date: Nov 2001 Posts: 194 Likes: 1 Liked 4 Times in 1 Post	rod/piston assembly weight Where do I find the minimum weight for a rod/piston assembly for my combo? Does the weight include rings and bearings? Thanks, Earle __________________ Earle Holt 1055 Stock

09-13-2010, 02:04 PM	#2
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,111 Likes: 1,570 Liked 1,812 Times in 413 Posts	Re: rod/piston assembly weight I think it is in the accepted replacement parts list in the competition section. It includes rings, but not bearings, since you can easily remove the two bearing shells from most connecting rods, and also the bearings would have different weights depending on how far the rod journal has been ground undersize. __________________ Alan Roehrich 212A G/S

09-14-2010, 01:30 AM	#3
Cam Junior Member Join Date: May 2004 Location: Prince George, BC, Canada Posts: 83 Likes: 5 Liked 0 Times in 0 Posts	Re: rod/piston assembly weight I think this is what you are looking for. http://www.nhra.com/competition/pistons.aspx __________________ Cam Chowen 6067 1994 Camaro C/S

09-14-2010, 07:04 AM	#4
Earle Holt Member Join Date: Nov 2001 Posts: 194 Likes: 1 Liked 4 Times in 1 Post	Re: rod/piston assembly weight Thanks guys, I appreciate it. Looks like weight does not include bearings and rod bolts. __________________ Earle Holt 1055 Stock

09-14-2010, 09:27 AM	#5
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: rod/piston assembly weight It may not be clearly stated, but I think you will find that rod bolt weight is considered part of the rod weight. All that is important is the correct parts/part numbers and the correct assy. total weight. __________________ Adger Smith (Former SS)

09-14-2010, 09:52 AM	#6
Alan Roehrich Veteran Member Join Date: May 2006 Location: Murfreesboro TN Posts: 5,111 Likes: 1,570 Liked 1,812 Times in 413 Posts	Re: rod/piston assembly weight Adger is correct, all rod fasteners are included, the total weight of the rod includes the fasteners, they put the rod nuts back on, or the bolts back in, before they weigh it. They only leave the bearing out, and for the reasons I gave. __________________ Alan Roehrich 212A G/S

09-15-2010, 09:04 AM	#7
Earle Holt Member Join Date: Nov 2001 Posts: 194 Likes: 1 Liked 4 Times in 1 Post	Re: rod/piston assembly weight Thanks everyone. I appreciate it. __________________ Earle Holt 1055 Stock

09-15-2010, 09:49 AM	#8
Adger Smith VIP Member Join Date: Dec 2001 Location: Texarkana Ark/TX Posts: 2,446 Likes: 575 Liked 880 Times in 311 Posts	Re: rod/piston assembly weight Earle, Another point that is clear as mud is the pin locks. You will find that "If" a piston is actually run press fit on the rod no locks are figured in the piston weight. If it is floated and pin locks are used they are considered part of the piston weight and are included in the total assy weight. Don't forget about them. __________________ Adger Smith (Former SS) Last edited by Adger Smith; 09-15-2010 at 09:49 AM. Reason: sp