alrite people my mate is convinst he wants a 1.6 ZT i told him a 1.8 with a de-comp plate and his sisters t2.5 with 360 degrese bering and manifold and one of my 130ps inlets would cost him the turbo a lump and a de-comp plate lol the rest will be a play around for me and him , can any one give me a price on a de-comp plate ? oh and hes only going for about 180/190bhp but wants a turbo and he wants it in his fez oh also hes got OFAB loom and ECU ect from his sister brakin her FRST
thanks

 

He'd be far better off dropping the Fiesta Turbo in. The 1.6 Zetec in the Fiesta is at best pants. Slap your mate round the chops and send him shopping for a FRST motor or a 1.8 or 2.0 Litre Zetec to start playing with

 

couldnt have put it better myself

 

if hes adamant on getting a zetec in the bud id recommend on having the standard pistons out and having them skimmed rather than going for a decom plate ,

was gonna go the same route and found it just as cheap to have them skimmed ,

a good auto engineering shop should be able to do it for ya

thay just press off the pistons and put them in late /mill

0.4 mm-for the 2 ltr
0.75mm -for the 1.8 ltr

should give to the correct comps for turbochargin

im sure i may be corrected , but im assured from a lad whos done the conversion thats the right amount

hope this helps

bri

 

nice one he can have a FRST lump but im sure its fuck TBH so rather just the bits and a 1.8 ZT like i told him , i dnt mine building it on my weekends lol beefy-rst-2 can u give me a ruff price on skimmin pistions ?

 

There is no replacement for displacement

(well, other than increased VE, boost, or nitrous )

 

erm, nooo...
to get 8.2:1 compression ratio on a 16V engine (1.8 or 2.0) you need to take off 2.5mm! in each case - that's a LOT of material off an already weak cast piston..

 

lol come on its going to be 200bhp Vmax , maby a 2.0ltr with 2.5mm copper gaskit ,and 10psi ? chips nos will make it go bang lolol

 

The early 1.6 Zetecs are a poor relation to the 1.8 and 2.0 Zetecs of the same era.

The valves are restrictively small and I believe the bottom ends aren't too great either (by comparison).

Much better to start with a 1.8 or a 2.0 - even if it's just with a decomp plate you can get over 200bhp easily enough

Andy

 

andyhardy that what i thought , u no what sort of boost to run to get a nice relible car?

 

luke im looking at around 50 quid , to get mine done, ( fitting it in between major jobs in the shop cheapens it up ..)

RICHEM

first time ive heard u have to take that much off fella ???

and luke hasnt stated if hes going 16 valve or zevh with a 8 valve head ??

i know i wont be taking no 2.5 mm of my pistons !!

 

just work out the volumes... either by skimming the pistons or adding a decomp plate, you need to gain 2.5mm of space above the pistons to reduce CR from 10:1 to 8.2:1

 

opinion noted fella ,

just its the first time ive heard it , and evry other persons telling me it aint that much ......

now i aint taking 2.5 mm off to find out its too much

u done the conversion urself bud ???

ran a motor with as u say 2.5mm off them ??



bri

 

it's not my opinion, just fact - if you work out the volumes, you need to add approx 12.5cc more volume above the piston at TDC to reduce the CR from the standard 10:1 down to 8.2:1 which is a sensible level for up to 15psi boost on the standard cast piston (that bit is an opinion, there will always be people who have done more..) - that equates to 2.5mm on a 81mm bore diameter to get 12.5cc.
Look at the site in my sig, you will see we used a 2.5mm plate to give 8.2:1 CR - at 15psi boost we saw about 200bhp without any apparent problems. The subsequent owner increased that to 17-18psi.

The pistons are weak enough already at those levels, I certainly wouldn't want to be machining anything like 2.5mm off!

 

I have heard of people using C20LET pistons from Vauxhall and modding them to accept the Zetec conrod. Went a bit over my head though

 

Oranoco yes people do that and i think the hole in the piston for the pin has to be made bigger, so people a de-comp plate 2.5mm is what im going to recomend some one on my msn runs 230bhp on a 1.8zt with a de comp plate fine ! if any one could link me to were i can get a decomp plate and price would help loads !!

 

its the little end in the rod that needs machining to make it larger because the vauxhall gudgeon pin has a bigger diameter than the zetec pin

 

As already said i would go with the decomp plate if on a budget. I wouldn't recommend pressing the standard pistons off the rods to get them skimmed. You are almost certain to bugger the piston up.

If you wish not to use such a thick de comp plate you could machine a small dish into the piston crown, leaving some stregnth in the circumfrence where it is needed.

 

been to my local machining shop today and theyve got a tasty lathe that should be able to skim my pistons down [/b]without having to take them off the rods !!!!!!

so now i just have to find out what the correct amount to take off is ??

so many people seem to use differing amounts ??

who to belive ?????

arrrrggghhh

there going in friday morning so best get somthing set in stone !

 

beefy...
it's not a case of who to believe, really... just get your calculator out and work it out! you need 12.5cc or so extra above the piston at TDC to get a 8.2:1 CR (for example) which equates to 2.5mm thickness across the 81mm bore, it is that simple..
2.0mm will give 8.5:1 CR and 3.0mm will give 7.9:1

 

not that i dont belive u rich mate ,,


just dont own a calculator

u may be right though fella ,

and any idea why the crowns of my pistons sit proud of the block

aparently 1.8 pistons are the best to machine as they have the thickest crown ???

 

LOL.. Please look at what is in front of you rather than going on hearsay, look how thick the crowns are, especially in the middle, then decide if you are happy machining stuff off. The cast piston is the weakest part of a budget ZT build like this, without making it any thinner.
If you really want to machine the pistons thinner, please do 2 sets, you will need them sooner than you expect, honestly.

The pistons always stand proud of the block, approx 0.25mm yeah? The reason is to get a close squish clearance between the crown and the flat parts of the head round the combustion chamber.