Need help on some pistons, probably borgo

[fedezyl]

Hey everyone!!

I'm in need of some help, I just bought some pistons for my car, well, my mechanic was lucky and found them for very cheap from a guy who sells used spare parts and had no idea what he had in his hands...
Problem is that we pretty much have no info on this piston but these facts:

It's for an Alfa 1.6 8 valve engine, on a 1981 Giulietta.

It's definetely for racing or high performance purposes, given the shape and that is about 2cm taller than the standard piston head so it's high compression

here are some pictures I took:


http://img54.exs.cx/img54/2307/u8jfotosdechile027.th.jpg (http://img54.exs.cx/my.php?loc=img54&image=u8jfotosdechile027.jpg)


http://img114.exs.cx/img114/62/f8wfotosdechile028.th.jpg (http://img114.exs.cx/my.php?loc=img114&image=f8wfotosdechile028.jpg)


http://img21.exs.cx/img21/4999/p2ufotosdechile029.th.jpg (http://img21.exs.cx/my.php?loc=img21&image=p2ufotosdechile029.jpg)

[FoxFour]

That's what we around here call a pop-up piston and yes that is a high compression piston. Pop up because the piston dome is 'popped' up. Do you know what the standard compression is on these engines?

[fedezyl]

The standard compression is about 9.2 to 1, the combustion chamber is hemisferical so the standard pistons have also a domed shape... we are guessing, thanks to DanV6 and his advice as usual...lol...that it should be around 10.4 or more compression ratio, given that they look like borgo pistons and that the ones for the 2.0 liter engine has a 10.4 compression ratio

[takata]

OMG!! the dome on the piston looks amazingly HUGE!
juz make sure they dun hit anything b4 u start craking the motor :wink:

[fedezyl]

don't worry, clearances and all have been checked, remember this is a hemispherical combustion chamber, so it's normal to have a domed piston head instead of the more common flat one....

[findleybeast]

good luck with that man can't wait to see how they turn out

[adamk24]

Yeah, as long as you take your measurements right you should be ok :mrgreen:

[fedezyl]

it's not me who's doing it, it's my mechanic, he's been working on these engines for 40 years

[fultron]

Thoes are definitly a good find, ive never seen any thing like that.
I would sure like to get my hands on a pair of thoes.

[fedezyl]

hehe, they cost me 60 pounds, that's including the skirts too