my mate is building a zetec turbo and burtons have taken on the job of machining his accrilite pistons to get a 7:5:1 compression ratio except my mate says when the engine is at TDC the piston is about 5mm lower than the block? is it just me or is this seriously seriously lower than what he wants? its an 86mm bore, with flat pistons (no bowl or cut outs) 1mm head gasket i think (focus rs) and half a thou of a blacktop head? any help much appreciated, cheers

 

paul he said he thinks they mucked up as he told them what he wanted but he is useing the shorter silver top lenth rod they mush have asumed he is useing the blacktop lenth rods

 

sounds like the silver top rods have been used...

 

At least he can run some mega boost lol

 

ohhhhhhh, just i asked him how far down the bore his pistons were etc as he wanted to work out the compression ratio and i was like lol, burtons will be hearing from him then lol

 

he just said the black top farndons gudgeon pin is a diff size so not poss?

 

but he used the silvertop rods and pistons in his blacktop paul as in the pistons were desined for a silvertop as well he wanted to change then but burtons said it dosent matter as they can skimm to sute lol but im gessing they dident lisen lol.

yea simon 30psi 38degrees advance yet no idal

 

feeling sorry for him, ain having much luck, yet spending top money needs to avoid burtons i think, u got your place to do stuff, theres steve boy and confident will be done right in them places. i always think work needs to be carried out at one place and not several tbh.

 

im trying to make some sense out of this !! did he supply burtons with the pistons from a blacktop? and they have put them onto silver top rods??

 

he told burtons he was using a blacktop block, using silvertop rods and accrilite pistons, they said
'not a problem, we'll skim it to suit' lol but i think its too low the compression ratio

 

Do Burtons now sell Accrilite pistons for the Zetec turbo conversion? A few years ago I bought some from them and they were for the ZVH conversion, when trying to fit the 16v head the compression ratio worked out at 13:1, skimming that much off the tops of the pistons was not possible or sensible.

 

i dont know tbh, i see the thread the other day of several people saying the same thing? i doubt his going to listen and he'll run it so we shall see i guess lol

 

Its all due to the different CC`s in the CVH head and Zetec head. Ended up selling my Accralites and getting some Area Six jobbies, worked them out to be 8.2:1 I think it was.

 

Sounds about right to me.

Vauxhall C20LET pistons on Ford silver top rods give around 7.4:1 in a silver top zetec engine.

Here's a photo of C20LET pistons at TDC in a silver top block

 

How many cc's are in the head ?
Are the pistons dished or flat ?

Steve

 

someone above said either 45 or 48? and his had a .25 skim. my block is out my car with c20let pistons and his sit around 1.5mm lower than mine prob with flat pistons which is surely alot?

 

Zetec combustion chambers are usually around 48cc