hello mate, i have got a set of steel rods from america, and am told that they are for the blacktop engine, what pistons could i use to get them to work in the silvertop? regards dave

 

you need pistons from a black top zetec also

bassboy

 

yeah i could use standard black top pistons but i want forged ones, cant i get these imported from the states?? also whats the best compression ratio for the job of a 250bhp+ ZT Turbo?

 

8.2:1 will be fine...most of the pistons available from the states are for the blacks tops any way

bassboy

 

well this engine i have is a mondeo 2ltr, so i imagine it is a silver top, so what pistons would be the best??

also is 10:5::1 too low comp??

 

so i have a silver top engine,
i can use black top rods with blacktop pistons??

 

something like Focus Central pistons will be ok...or try Ian Howell at area six who specialises in zetecs - 01522877887 and he can supply pistons

10.5:1 is too high...you need about 8.2:1 and it will easily see 250hp

bassboy

 

ok, say if i had black top rods, and black top pistons,
they would wit in the silver top engine??

 

yes they will go in no problem

bassboy

 

how a comp ratio of 9:0:1 ??

 

ideal is 8.2:1....you wont be able to run alot of boost with 9:1 and if you do try to....you need an EXTREMELY good intercooler and fuelling and mapping!

bassboy

 

any ideas where i can get a set of 8:2:1 comp pistons then? i am clueless, and i aint a clue how to order custom spec pistons..lol

 

which rods did you buy eagle or cosworth?

 

eagle rods mate

 

well i'm running eagle rods in my zvh i brought my pistons from here www.nolimitmotorsport.com part number 185915 you might have to use a de-comp plate or have the head cnc machined to gain more cc to lower the compression americans are not into low comp like us brits. ian howell can provide you with pistons but like you found with the rods you cant beat american prices, i brought my rods and pistons for under Ł500 and they have served me well.

 

yeah, these aplications dont come with the rings do they? i need to buy the rings seperate??
whats your current spec and power read outs? im only looking for 300bhp regards dave

 

really i no of a few turbos runing this or higher and have run over 2bar of boost

 

Please share where you got your rods from cos I was looking through the burton catalogue with a tear in my eye

Dave.

 

A little hint, ST170 head gasket is a 4-layer full stainless gasket and is nearly 0.5mm thicker than the standard 3-layer version used in other black tops.

 

calibre turbos run a 9:1 comp

 

turboboss


they have Compression: 9.0:1 isnt that to high? or is that ok? I am building a zvh my self and they was some cheep pistons

 

calibra turbo pistoons do have a ratio of 9:1 ando produce a fair bit of power, these are a popular choice of piston by ZVH builders. but i have got steel rods and the pistons wont fit them, think i may be buying a set of custom made ones from diamond, and have already chose my managment (emerald).. will see how it goes.

 

The only real difference (if I recall correctly) between the 2 engines is a crank/rod geometry change with the better geometry being in the black top. Ideally you want the crank out of the black top too so you can take full advantage of the revised geometry.

 

yeah i know there are probably loads of people doing it...there are also loads of people running 10-11:1 with more than 2bar boost but i know 8.2:1 CR is available using JE pistons for the zetec and i know a fair few people running 8.2:1 and hitting over 250-280hp no problems...all down to mapping and intercooling at the end of the day

also depends if the car is a top speed racer or a quick point to point car with minimal lag

bassboy

 

davsmith64 the best advice i can give is give Ian a call...he will even probably have pistons in stock for you! prices are very cheap and he aint known as the Zetec God for no reason

bassboy

 

9:0:1 on the 48cc zetec head with the 57cc cvh head you'll end up with a compression ratio of 8:4:1 so you would have to use a 1.2mm de-comp plate or have the chambers cnc machined out.

 

i brought my rods and pistons from the same place as above, can buy cosworth steel rods for the zetec for Ł288 from here www.focussport.com

 

the pistons come with rings the rods and pistons and handle 400whp which they have done on many zetecs from america

 

yeah but does this piston kit come with rings?? part number - 185915
from www.nolimitmotorsport.com

 

YES they even state the part number for the rings thats where mine comes from with rings

 

turboboss Top info rekon i may purchase a set of rods and pistons in the new year.

 

e-mailed them regarding the rings and heres what i got

""They come with the pins, but the Ring set is separate. Price is $510 with rings. ""

heres what i sent

""hello, just been looking through the catalogue and found the following item number - 185915 piston set

does these come with the piston rings, wrist pin ect???

regards dave""

 

i'll have a look myself when i brought those pistons they where priced at $429 and they came with rings,

 

just had a look part number fro the rings are jxcof4 3346-2 priced at $82 and pistons $427 price has gone up was $429 all in still cheap though!! when i ordered the pistons i did'nt ask for the rings i just assumed they came with the pistons must of been lucky.. but still only Ł283 for a set.

 

turboboss, what compression do you run? sorry to bring back an old topic !

 

this topic is on going so no worries there... 7:8:1 m8

 

what size decomp plate will i need to lower the compression from 9.0:1 to 8.2:1 or 8:1?
regards dave

 

1.2mm cvh head 57cc so with those je pistons and eagle rods comp ratio = 8:4:1 with 1.2 de-comp plate 7:8:1

 

its not going to be a zvh???
its a full zetec head..??

 

with those rods and pistons speak to mike @ ferriday engineering tel 01785 621710 he can machine the chambers to gain some more cc or work out what de-comp plate thickness you'll need.