shrinking pistons?

[jason frost]

Looks like there are lots of people going to be looking at this, hope they can get to the bottom of it.

[mark]

hopefully it can be sorted amicably.
the reason for this post as already stated is to find out if its a one off which its clear its not,its quite possibly a batch problem

[CANbus]

http://www.rosspistons.com/information/ ... p#forgings

Have a look at this half way down the page, I have a supplier that uses these forged pistons as he is fully aware of the shrinking factor.
I will not bother our metallurgists then Mark if you’re talking to one already, their time is expensive.
They did say there are many different types of Ally, typically T6 aluminum (group) is better due to the low Si (silicon) content. Typically on the good stuff its 0-2 too 0.6%/Wt
However this may vary depending on what location the piston was forged at.

[mark]

As I have said the contract by law is between my engine builder who is the purchaser of said defective part according to the dealer and trading standards. I only started this post to find out if it was a one off which I believe I now know the answer to.

[Speed Demon]

Answer has already been aluded to Mark. It's the silicone content.
Think about it, when you caulk a window with silicone, after a while(granted, years) the silicone will start to shrink and you have to do it again.
In an engine the heat factor is a lot more than on a window, therefore the deteriation will happen far more quickly.
What may have happened is that there was a bad batch of pistons made with too much silicone in them. Great for not seizing and or a race meet, but no good for a road scoot. Everything is a trade off.

I think you are confusing soft stuff silicone (glazing sealant and false tits - both out of the same stuff if you are French) and hard stuff silicon (PC chips). There's a bit of a difference as you'll know if you've ever tried to snuggle into a pair of Silicon breasts

[Andy Pickering]

if you've ever tried to snuggle into a pair of Silicon breasts

.............................

[RICSPEED]

a pair of Silicon breasts

so .....what do they feel like ??

[drew2]

Speed Demon wrote:
a pair of Silicon breasts


so .....what do they feel like ??

a pair of pistons

[Speed Demon]

a pair of Silicon breasts

so .....what do they feel like ??

Like banging your head against a brick wall...















...I guess.




Thankfully the good lady is all natural so nothing I have to worry myself with.

[warts]

have you not heard of tuff titties?