i found out today that series one, series 2 and fiesta turbos all have different pistons. but the same rings.

i had a series 2 and a frst piston together today and noticed a few differences. the series 2 has a larger crown and deeper valve cut outs.

my question to you is could you use erst pistons in a frst block?
i dont have a micrometer so i couldnt measure from the top of the piston to the bottom of the rod on each to compare them.

just from seeing the larger crown on the erst piston i thought if you put that in the frst block would it increase the compression ratio?


also just wondering, do erst and frst engine have the same compression ratio?

 

tell simon to call me in the morning as i need to speak to him please mate

 

all same compression ratio, they just changed in design slightly. When you buy +0.5mm pistons they are all the same.

 

so effectively you could use a erst piston in a frst block?

 

yes, as long as they are all matching!

 

So no then
We looked at mixing them then quickly came to our senses as it was silly to work out the comp ratio etc... as they also had different rods in them etc...

Still sorted now cheers cowboi
My effing back hurts though

Ginge whats up?

 

just been talkin about ur engine. probably best to turn the boost down a bit and try to keep the car running till u build the zetec. i cant be arsed doing it again this year. haha

 

was gonna say you could borrow my engine , sorted now though i see

 

cheers ginge but pretty much sorted. ill tell you my reasoning why tomorrow but ill be replacing the piston before anything else, the botton end is a good'un

Who suggested that cowboi and why?