Hej all,

Been thinking to convert my 2.0 zvh to full zetec but what about the Compression ratio.
What will putting a zetec 16v head on there in stead of a cvh 8v head do to the CR?
Currently running 8:1

Thanks

 

It'll raise it by about half a ratio at least.. too much in my opinion.

 

am i right in thinking you are saying 8.5.1 would be to much for a zetec turbo??

 

Depends on how much power you want? What fuel you intend to run it on? etc..

 

300@ the wheels on super unleaded??

 

imo 8.5 would be fine if thats wot it ends up as, you'd have to make sure with some calculations though- or get advise from your engine builder/mapper to see wot he reckons

 

With the right cams, turbo choice, yeah you'll be able to hit that peak figure at the expensive of a lovely wide flat torque curve.

 

Looking to get close to 300 bhp at the flywheel.
Thought of running standard head and cams.
Stage 3 t3 wich i have now or maybe a t34 later.
What pressure will i have to run to achieve this?
Gonna do it myself so have to get me a zetec head and i'll calculate it then.
Just thought to ask first so i know what work to expect.
But for the setup i want is 8.5:1 ok or should the pistons be skimmed some more preferably?


Thanks all so far.

 

well my cams are standard and so is the head and my compression is more than 1 compression higher than stated on a t34 that comes on @2k

 

Well 8.5 should be fine then.

What pressure are you driving it.. i thought you were also driving a zvh or am i mistaken with someone else??

 

Hi Greg

just wondering why are you going down this route? what sort of power is your car pushing out now? does it drive well? im only asking as im doing a zvh in my s2. As for your original question, may I recommend speaking to chris at powerconversions.co.uk he really knows his stuff on these engines

 

Hej,

my car was pushing out 230 bhp at 12 psi @ 5800 rpm on mfi.
It's on efi now and it's pushing 18 psi.
Problem is it can't rev beyond 6000 k and currently i'm having problems to even getting that.
As a result i'm having a shit powerband as the turbo kicks in at arroud 3500.
With a standard t3 it was much more driveable :P
Problem seems te be in the head/cam/lifters or a combination.
For the same monney to get that sorted i can get it full zetec and certainly get more revs.

I'm not from England so'i'll have to sort it out myself i guess..

A ZVH can be a nice drive and pulls like mad with great torque but doesn't rev verry well most of the time

 

with the right head and cam your zvh will rev and i mean something like a stage three head is no good, just about flows enough for a 1600 start with a newman P4 cam solid lifters and single valve springs.. my old zvh peak power was around 6300 but now i know this was down to the very heavy valve train, car is currently in bits soon you will be able to see how far a zvh can rev.

sean

 

I was running my ZVH 2.0 at Ford Fair and kept running into the rev limit which is (7500). They do rev, you just have to get the balance of componants right, cam, cam timing, turbo, mapped right.

S.

 

That's why i said most of the time.
I know they can rev but you have to put in some real money.

That's not an option for me so i can go 16v easier and cheaper.

I'm verry interseted in how your new egine will go .

 

I don't think your issue is to do with the head Gregor.. more likely a problem with the cal or the ecu, going by your previous posts.

 

Hej Pa Sjo, that's what i thought but i've tried about everything from spark advance to fuel to dwell settings but it doesn't seem to get better then 6k :S