ViribusUnits

I was doing some reading about conning rods.

Clearly, we all know about cast, forged, and sintered.

Anyone ever heard of a conning rod that was sintered and then somehow forged?

As best as I can tell, they're useing new ones in the Ford 6.0l turbo desile. That traditionaly seems to be the location of forged conning rods. How is this possible? I was reading a artical that basicly states that the "forged sintered" rod Ford is useing are as strong, or stronger, than their traditional forged counterparts.

Uh?

Any ideas? Any truth to this?

Btw, I thought my mannual for my 83 said a forged steel crank, and "sinter forged" conning rods, but I can't say for sure now. this makes no sence because if the rod is like a forged rod, then it's a massive over kill for the engine.

WallyP

Process Definition
Custom blended metal powders are
fed into a die, compacted into the
preform shape (different from the
final part shape), ejected from the die
and then sintered (solid state
diffused) at a temperature below the
melting point of the base metal in a
controlled atmosphere furnace. The
heated preform is withdrawn from the
furnace, coated with a high
temperature lubricant and transferred
to a forging press. The hot preform is
then close die forged (hot worked) to
cause plastic flow, thus reshaping and
identifying the preform. The
compaction step requires the preform
to be removable from the die in the
vertical direction with no cross
movements of the tool members. The
sintering step creates metallurgical
bonds between the powder particles
imparting mechanical strength to the
preform. The forging step reshapes
the preform to its final configuration
and reduces the porosity to nearly
zero.

Advantages
*provides mechanical properties
equal to wrought materials
*a net shape process technology,
requiring only minor secondary
machining
*greater dimensional precision and
less flash than conventional
precision forgings

ViribusUnits

So am I reading that right?

A forged sintered rod would be about eqaul to a "wrought" rod. And "wrought", IIRC, basicaly means the same thing as forged?

Assumeing I'm reading the owner's mannual correctly, that would mean the 83 928's bottem end is a big time over kill, expecaly in US form.

WallyP

I would expect a forged sintered rod to be better than a simple forged rod. One reason for using sintering is that you can make alloys of materials that won't normally alloy - that is, you can blend powders and make an alloy that would not work in a liquid form.

So, you could make a better material by sintering, and still have all of the advantages of forging.