h beam or i beam
06-01-2008, 10:56 PM
#21
1.5 BAR
Join Date: Jun 2005
Posts: 875
Re: h beam or i beam
ok, what do top fuel race car's use. I-beam.
http://www.bmeltd.com/rods.htm
and I quote " connecting rods are usually made of forged or cast steel formed in an I-beam shape for strength"
from my text book, automotive service, third edition. and the class is ase natef certified.
http://www.bmeltd.com/rods.htm
and I quote " connecting rods are usually made of forged or cast steel formed in an I-beam shape for strength"
from my text book, automotive service, third edition. and the class is ase natef certified.
06-01-2008, 11:35 PM
#22
1.5 BAR
Join Date: Oct 2006
Posts: 964
Re: h beam or i beam
Originally Posted by cloud
actually an I beam is structually strong then an H beam.
Originally Posted by cloud
and I quote " connecting rods are usually made of forged or cast steel formed in an I-beam shape for strength"
from my text book, automotive service, third edition. and the class is ase natef certified.
so your book doesn't make the comparison of H and I beams? I thought thats what we were talking/arguing about.....
06-02-2008, 12:15 PM
#28
3.0 BAR
Join Date: Sep 2004
Posts: 1,588
Re: h beam or i beam
Depends on which direction the rod will fail. I have no fact content to support my opinion so read on only for my 2 cents, I dropped out of ME like a drunk idiot.
I can't see how rods would have near the side loading to make an H rod better suited the application. The big end of the rod is basically reciprocating front to back at a high rate while the little end sits still. So the rod's going to want to flex in that direction. Then factor in the assembly going up and down in the cylinder and the forces trying to compress the rod it's going to want to bend in the same direction. Most broken rods I've seen were bent in that direction before they broke, not bent towards the other cylinders.
Isn't the point of an h or i beam to separate the material in the same direction as the bending force? basically separating it into two bars, one in compression and one in tension?
With those thoughts I've always wondered which is better and why aftermarket forged rods are H-beams, but I have opinions about cost of manufacturing.
I can't see how rods would have near the side loading to make an H rod better suited the application. The big end of the rod is basically reciprocating front to back at a high rate while the little end sits still. So the rod's going to want to flex in that direction. Then factor in the assembly going up and down in the cylinder and the forces trying to compress the rod it's going to want to bend in the same direction. Most broken rods I've seen were bent in that direction before they broke, not bent towards the other cylinders.
Isn't the point of an h or i beam to separate the material in the same direction as the bending force? basically separating it into two bars, one in compression and one in tension?
With those thoughts I've always wondered which is better and why aftermarket forged rods are H-beams, but I have opinions about cost of manufacturing.
06-02-2008, 01:36 PM
#29
1.5 BAR
Join Date: Jun 2005
Posts: 875
06-02-2008, 05:51 PM
#30
1.5 BAR
Join Date: Oct 2006
Posts: 964
Re: h beam or i beam
Originally Posted by cloud
Originally Posted by cloud
they do. an i beam is stronger.
