NEWTON

hi,im planning on building a zetec turbo engine,and i have sorced all the bottom end parts from the states (je pistons,eagle rods) the pistons give a compression ratio of 9-1 with a 48cc zetec head,but i really want to alter the comp ratio to about 7.9-1 or 8.1-1.

so the question i want to ask is has anyone had a zetec head combustion chamber modified /machined to get the desired comp ratio?? is the enough metal there to do this? and the last one,if i was to get the pistons machined would this be safe or would the crowns of the pistons go to thin.....thanks

cjwood555

48cc is the size of the ST170 combustion chamber - a standard zetec is something like 52 iirc? so that gives you a head start

NEEDFORSPEED

was gona say get an st head much better head as standard anyway bud.

NEWTON

st head is 40cc well thats what ive been told

NEWTON

yes ill have a look for one, but i still have the comp ratio problem,i dont really want to machine the pistons

G2RSR

48cc normal zetec head

42cc ST170 head

The guys to ask would be http://www.ferriday.co.uk/cnc/combustion.shtml

percybigun

i think i'll get a set of these forged Eagle rods soon, just to put to one side for if and when i have the bottom end apart. they stop making them or if the yanks twig on and rocket the price.

only about Ł180 a set of 4 arent they?

http://focus.c-f-m.com/index.asp?Pag...OD&ProdID=1053

NEWTON

yes thats right mate

NEWTON

thanks mate ill have a look