We have been tossing around the idea of running OTS Bisi pistons and rods for the F20b.

Then it dawned on me, my brother is a machinist and I have a cad/cam background.

I've been reading quite a bit on the net about advantages of billet pieces vs forged, and having the ability to use a stronger alloy (that is not forgeable)...

If i were to design it based on the stock rotating assembly and have it balanced would this be an advantage over just order OTS pistons and rods?

Can anyone give me advice on alloys to use for the pistons and rods or direct me to a person or business that might be able to help?

I think it would be interesting to make billet pieces over forged and the cost would be quite a bit more reasonable (maybe not time, but material cost)

-Jerod

 

you will end up spending more in materials to buy the solid blocks of billet than to buy pistons already made. besides, billet expands and contracts too much due to heat to use in a combustion chamber. it would expand to the point of putting too much pressure on the rings, cracking them, and probably seizing inside of the cylinder walls where there is no more room for growth. billet is great to be used in a lot of place in the engine bay, but not in the internals

 

The only real reason to use a billet blank rather than a forging is in the instance in which a forging isn't available for a particular application. There is a lot more machining involved in machining a piston from a blank where as a forging generally eliminates a good portion of the machining steps you would take when starting with a billet blank. I would definitely look into either a shelf set or a custom set of aftermarket forged pistons rather than going the billet route.

'Dog

 

Hello
I am new here
As a piston designer/manufacturer I would like to speak about this subject
Two things
Forgings have equal strength in all axis and also gain machining time as correctly said here
But....
You need a dedicated forging for having a very well manufactured piston
But....
Each piston would normaly need a different tooling die.
Also forgings have two problems
The surface that you do not machine is uncleaned and also it is not accurate
If you want to make it proper you have to machine 3D a forging just by 0.3mm all around the inner shape "killing" impurities and giving the equality that a race piston heat dissipation requiring

another thing is that you have to use only the commercial well materials 4032 and 2618
You cannot go on MMC or special Silicon content materials for specific race application

Finaly and very important is that ring land inner radious is very related with piston profile
Forgings just have one radious so you cannot maximise this zone stability
And if you only cut the strain of aluminum in that land as many piston manufacturers do then you just have destroyed the strain of the forging
So you forge only for making a cheaper piston?

F1 pistons are never made from cheap forgings
Even some time being dedicated forgings they will receive full machining in all surfaces

Thanks for your time reading my post

www.dpengineparts.com

I would happily help as much as possible with my billet pistons and rods anyone wants to receive a high end engine component

 

Something that I forgot
Bullet or forged it expands exactly as the actual material thermal linear coefficient
Thanks again
Forged billets have a material compression ratio
Compacted material is better than casted even under pressure
Strain of material gets stronger and more compact