piston options

[frank]

cutaway pics of CG13, CGA3, corsa and LPG CG13
the LPG ones have the thickest top ringland eh, and the CGA3 has the thinnest (the ones in mine atm )

 

[Belly93]

im guessin the end ones are the lpg ones? reckon theyd be good for boosting?

 

[frank]

im guessin the end ones are the lpg ones? reckon theyd be good for boosting?

on the right yeh, the top ringland stood 20+psi np, but as you can see at the bottom of the pic, the 2nd and 3rd ringlands let go (stock ecu)

 

[Belly93]

i see :/ so only real way to take presssure is to go forged pistons?

 

[frank]

i see :/ so only real way to take presssure is to go forged pistons?

det is the culprit tho eh, the peak pressure @ about 15 deg ATDC is about 1000 psi, and det will double that instantly apparently

 

[Belly93]

:/ mapping and pistons and other stuff lol

 

[frank]

:/ mapping and pistons and other stuff lol

i det,ed the top ringland on a coilpack 1.0 piston a while back (same design as the CGA3, but without the dish) you could hear it ching ching in the combustion chamber for a minute or two, then it was spat out the exhaust.
engine ran fine afterwards, but i pulled it out anyway

 

[Belly93]

better to be safe than sorry

 

[SirChris]

hmmm so is forged really needed :/

 

[frank]

hmmm so is forged really needed :/

time will tell eh chris

 

[SirChris]

the endless possibilities!

 

[euro_micra]

Good post frank.
So is the CG13 the only piston with those slits? Would that be it's main weak point?

 

[frank]

Good post frank.
So is the CG13 the only piston with those slits? Would that be it's main weak point?

and the pre-coilpack CG10 i think matt. and it weakens the lower ringlands eh
all the other pistons have holes instead of slits for the oil control rings eh

 

[SirChris]

So what pistons are we suggesting then?

 

[SirChris]

the LPG CG13 what the hell are these?

 

[frank]

the LPG CG13 what the hell are these?

ones from a forklift engine that someone gave me chris (was actually a big refrigerator engine, but most of the LPG CG13,s went into forklifts)

 

[SirChris]

Frank/... ARE YOU FROM ANOTHER ****ING PLANET!!! jesus i love you.. I mean a fork lift... I can understand someone gave a ride on lawn mower.. but no .. a random fork lift engine.

 

[Tony Perks]

I would go for the Corsa piston as they have a good top ring land but also the lower land to skirt is much more thicker giving the whole ring pack more support, especially with a boosted engine , and of course they are bigger too so more CC's so more torque too, if worried about comp ratio use the xe piston with the dish in I think xe 10?