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Re: shrinking pistons?
Posted: Thu Jan 12, 2012 9:20 pm
by jason frost
Looks like there are lots of people going to be looking at this, hope they can get to the bottom of it.
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 9:31 pm
by 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
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 9:40 pm
by 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.
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 10:29 pm
by 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.
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 10:32 pm
by Speed Demon
dirtyhandslopez wrote: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
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 10:35 pm
by Andy Pickering
Speed Demon wrote: if you've ever tried to snuggle into a pair of Silicon breasts
.............................
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 10:37 pm
by RICSPEED
Speed Demon wrote:a pair of Silicon breasts
so .....what do they feel like ??
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 10:42 pm
by drew2
Speed Demon wrote:
a pair of Silicon breasts
so .....what do they feel like ??
a pair of pistons
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 10:45 pm
by Speed Demon
RICSPEED wrote:Speed Demon wrote: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.
Re: shrinking pistons?
Posted: Thu Jan 12, 2012 11:56 pm
by warts
have you not heard of tuff titties?