Crank Strength??

[Turbo V6 Camaro]

Originally posted by oil pan 4:
The stock rods are forged.

for the 3.4?

[oil pan 4]

All V6/60 degree production connecting rods are manufactured from forged steel and heat treated at the factory. The center to center length of all V6/60 rods is 5.700-inch, and the big lenght bore diameter is 2.124 to 2.1252-inch. These connecting rods are suitable for high performance and limited competition applications where engine speeds do not exceed 7000 rpm.
I have several different web pages saved on my computer that say this.

[oil pan 4]

And the 3.8's rods arn't, hahahhahahahahah!

[White95]

Let me correct my self....I'm getting Ultralight Manley Forged Aluminum Connecting Rods :)

[Turbo V6 Camaro]

Originally posted by oil pan 4:
And the 3.8's rods arn't, hahahhahahahahah!

they are now [img]smile.gif[/img]

[oil pan 4]

You don't want to run aluminium rods on a street engine.
Go ask that over at camaroz28.com advanced tech bord.
Guys run them in drag cars and they change them after about 12 1/4mile traps.
They will stretch and deform at high rpms.
Heat treated 7xxx aluminium alloy has a max tensile strength of about half a steel rod.
It's plastic deformation strenght is even less.
I'll get the numbers if I can get away with screwing off for a while at work.

[Turbo V6 Camaro]

Originally posted by oil pan 4:
You don't want to run aluminium rods on a street engine.
Go ask that over at camaroz28.com advanced tech bord.
Guys run them in drag cars and they change them after about 12 1/4mile traps.
They will stretch and deform at high rpms.
Heat treated 7xxx aluminium alloy has a max tensile strength of about half a steel rod.
It's plastic deformation strenght is even less.
I'll get the numbers if I can get away with screwing off for a while at work.

were you pulling AL from

[oil pan 4]

white95 said:
"Let me correct my self....I'm getting Ultralight Manley Forged Aluminum Connecting Rods :)"

7xxx aero space Al alloy is made to be ductial and crack resistant. It is designed to stretch and flex but not break.
It has a maxmium tensile strenght of 650MPa.
7xxx's are made for aero space appications for air frames. They usaly don't use it in wing structures, 5xxx alloys are most commen for that.
Now 4340 steel alloys are made to resist forces like flexing, stretching, twisting and breaking.
They have a Minimum tensile strength of 1200MPa.
These alloy are made to resist cyclic multiaxial or Combined Loads.
Aluminium dosen't have an all most infinite fatigue life like steel, If you load Al enought times it will break.
That is why they make steel buildings that are made to last 100yr or more and air planes are made to last so many hours usaly as many as 100,000-200,000hr's. After that the upper surface of the wing will crack.

[Turbo V6 Camaro]

Originally posted by oil pan 4:
white95 said:
"Let me correct my self....I'm getting Ultralight Manley Forged Aluminum Connecting Rods :)"

7xxx aero space Al alloy is made to be ductial and crack resistant. It is designed to stretch and flex but not break.
It has a maxmium tensile strenght of 650MPa.
7xxx's are made for aero space appications for air frames. They usaly don't use it in wing structures, 5xxx alloys are most commen for that.
Now 4340 steel alloys are made to resist forces like flexing, stretching, twisting and breaking.
They have a Minimum tensile strength of 1200MPa.
These alloy are made to resist cyclic multiaxial or Combined Loads.
Aluminium dosen't have an all most infinite fatigue life like steel, If you load Al enought times it will break.
That is why they make steel buildings that are made to last 100yr or more and air planes are made to last so many hours usaly as many as 100,000-200,000hr's. After that the upper surface of the wing will crack.

ok i get yah now

[White95]

Alright I looked around over at Camaroz28.com and couldn't find anything on AL rods and such. I thought manely rods where stronger than normal AL rods and had half the stretch 7075 T-6(whatever that means reffering to the number)and could handle 1300+HP!?!?!?!?! I hope they come with a good warrenty if they break after 12 runs....What counts as high RPM?? I the most I'll be going is somewhere around 6500...

By the way is the 3.4L Crank Forged as well???

[ October 25, 2004, 12:14 AM: Message edited by: White95 ]

[oil pan 4]

The 3.4L crank is made of cast nodujolar Iron.
That is the same materal as the LT1, also cast about the same time and those cranks are well known for taking some power.
The thred where I asked about forged Al rods was before I cam in the airforce so that was like 3yr ago. I'm sure it has long been deleated.
They might hold.
If I could know the surface aera of the thinest part of the rod (around the wrist pin), the weight of piston, pin with rings I could come up with mathamatical yes or no.
Import guys do it and you know how long some of there street engines last.
7075 is the alloy and T6 is the longest set of heat treatments the will decrease stretch, increase likelyness of cracks and decrease warpage and increase strength.
I thought they would be made of 7015.
Most race parts have all most no warrenty.
And the upper wing edge lasts less than 40,000hr in most planes.
The tail section lasts 100,000hr.
I messed that up.
I found a pic of the mantly Forged Al rods and the little end is to thin and that will be the first place to go.
With aluminium it's not how much force you put on them it's only a matter of time before they break.
If you go much over 10% of the cross section aera tensile strength the aluminium will break.
Forged aluminium pistons don't break as long as you don't push them past what there made to do because if you have ever seen a cross section of a piston it is real thick.
I would get steel rods.
If you want an ex. of an engine that makes power and made to last look an nextell cup cars engine.
They use heavy forged carillo (<sp) H-beam steel rods, there heavy and super tough.
If some one can make an engine that can go 500miles all most non stop making full power most of that time then you know that there on to something.