View Full Version : Will I need to change my pistons?
I have an AUQ block and am going to be aiming for around 350hp.
I already have rods from yourselves waiting to go in but no one seems to know what the 19mm pistons can withstand.
Any help would be great
westallc
06-12-2009, 18:46
if changing the rods you might aswell do the pistons...:D
makes sense doesnt it??
I have an AUQ block and am going to be aiming for around 350hp.
I already have rods from yourselves waiting to go in but no one seems to know what the 19mm pistons can withstand.
Any help would be great
No you don't have to change the pistons for 350bhp. I know your other thread on this topic got a bit derailed and turned into a bit of a debate for people to show what they didn't know instead. Like I said on your thread before it all went to the wall, stockers have been used up to 700bhp on engine dynos - I'm currently awaiting confirmation of exactly which stock pistons were used to hit that.
On 19mm I'd say 500bhp should be a safe level to start worrying at (based on what I've seen on other forums - try vwvortex as there are many many more 400+bhp 1.8T than we have in the UK).
If you've already spent the cash on uprated 19mm rods, then I don't see the point in spending more for 19mm stock compression pistons? :confused:
DaNnY_LaD
13-12-2009, 19:54
If you havent got the rods yet it would be worth while going for the 20mm pin setup as there alot stronger...
U have a u2u
He already has the rods. 19mm rods and stock pistons have been proven to over 500bhp - no need for 20mm!
DaNnY_LaD
14-12-2009, 18:12
I was told By Backdraft & Others that 20mm pins Are fair Better !
It's only 1mm so can't be a huge amount better IMO - can't really argue with OE pistons and 19mm rods being taken to over 500bhp. Obviously if you're building from scratch then yeah, go 20mm but no reason to scrap 19mm pistons if only doing rods.
narrower pins = lighter pins = reduced reciprocating mass + reduced rod loads. :D
Dave@integrated
15-12-2009, 23:25
There's no doubt that the 20mm pins are tougher but don't need to upgrade the stockers for 350hp. I agree with robdon that I would think about upgrading them around 500 hp.
I have however made close to 500whp with my gti but I wouldn't daily drive it that way...