QplateRST!

A lot of people are in 2 minds which is better out if the two personally I'm a 16v man what's other peoples opinions on this

Daveysaff

iTrader: (9)

You're right.

The only reason I could think of to justify spending on a zvh is if you've already got money invested in a CVH head and/or already got trick manifolds. In most cases that could be sold on and 16v stuff bought anyway!

It's Czech Mate

Cant see the point in a zvh unless you are strapped for cash and already have a cvh head/inlet with a pile of money sunk into it.

There is NO other reason, if you are obsessed with originality and want to keep the look of the bay 'correct', then youd be wanting the correct bottom end IMO as well

Ł for Ł if you sink the same cash into a 'standard' zvh as a standard zetec then the 16v will give a better engine every time

little bram

I like both. The zetec is a better engine and if I was to build another engine for my car id build a zetec but a zvh is just a better cvh imo. The cvh bottom end struggles past 300bhp where the head with the right cam and the right porting can do 350 and even 400+ with the right turbo and manifolds so people can use standard manifolds and keep it looking abit like rs turbo. Its never going to look totally standard but if you want more than 300 its never going to be, Its like using a better 1.9 tall block.
I can't see the point if doing a full zetec using standard escort/fiesta manifolds

Fiesta_Jed

What nobody mentions is a heads ability to dissipate heat a cvh head does this better than a zetec.

It's Czech Mate

Does that out weigh the cam-eating shitpile of a valve train?

little bram

It will only wear out the cam if you have a shit make of cam in or have double springs in.

Fiesta_Jed

The valve train is not a problem if you use a newman cam with solid lifters.

QplateRST!

IMO zetecs make the power very easy with little mods

luke19790_3

What about the rocker studs getting pulled out

Fiesta_Jed

Ive never actually seen this happen, probably because all the zvh heads I have seen had helicoils/time serts fitted.

luke19790_3

Mine did it

Fiesta_Jed

Did you fit helicoils to the head ?

mk1trb

after having all 3 variants, cvh/zvh/zetec i have to say zetec for me, the difference is like night and day. you get power then when the second cam comes in around 4krpm you get more power.

luke19790_3

Yes

Also

https://passionford.com/forum/ford-e...kers-pics.html

xr2wishy

iTrader: (2)

done both, loved the zetec more.
much more power, but then a lot more money spent on it.
head heat dissipation is but a minor benefit over the zetec, the ability to use a pretty much standard head in a zetec is way more beneficial over having to port the heck out of the cvh head and going for bigger valves for hitting 400bhp.
it's like saying 16v is better than 20v, is better than 24v etc.
if it does the job on a budget you're happy with, then that's the engine for you.

Fiesta_Jed

What did you torque the rocker studs to ?

Never seen anyone break a rocker either.

luke19790_3

Did it two or three times, used the torque settings in the manual

jamie's

i've seen several cvh's break rockers on standard(even non turbo) engines

rsmark86

iTrader: (3)

Zetec turbo is cheaper too extract power from

I have a 300bhp zetec turbo engine on here for sale for Ł750

Can't get cheaper than that lol

Wink wink

luke19790_3

Good price if it was a blacktop I would have it

little bram

I've never seen studs been pulled out of a head apart from stu's but I put that down to him saying he's running high compression.

rsmark86

iTrader: (3)

I got a brand new john frs gt25 turbo with manifold and heat shield for a black top lol

Shame, engine is lovely, I'm gutted too sell up (again) but family comes first

Anyway back on subject lol

Zetec turbo for me

Zvh as above if you have a daddy head or need just a bottom end change, or what it too love original

luke19790_3

Didn't you have issues with you head or was that down to the mapping?

Remember reading something

little bram

Ha you've got them going again never ending this

little bram

Never had the studs pull out or rockers smash just worn valve guides.

It's Czech Mate

Standard cvh cars scrap the cam in 30k miles, always did from new let alone modded

The oil supply is shit

little bram

There for that's sandard cam not a newmans cam witch are better cams. Like said before it's what you want out of your car and how you want it to look.

lewis.philcox

Personally its all about the CVH head/manifolds as you cannot beat the rumble of a CVH compared to a zetec

xr2wishy

iTrader: (2)

mk broke a rocker in his old mk2 fiesta, that was built by field motorsport i believe, so no shonky outfit either.
the zetec does away with so many parts the cvh had at risk, we all talk about what is better, but what does a zetec engine fail on and what power that a cvh doesn't?
i can't think of a thing, even oil pumps on a cvh get sensitive at high power and dry sump is the way over 400bhp anyways.

It's Czech Mate

Sorry I didnt realise that a new cam changed the oil supply

QplateRST!

Zetecs sound far better IMO but I do have a soft spot for a cvh with a 4" scorpion hitting about 20psi

XRT_si

iTrader: (2)

Can I ask - how many CVHs/ZVHs have you built/worked on?

QplateRST!

I've seen plenty of broken rockers even on just chipped rst's back in the day they used to snap them

little bram

It doesn't I never said it did. If you fit something that's made for better materials it's going to last longer and there for is better. At the end of it all it's a old car with a old head and if you don't like them don't buy one or don't build one like ave said the zetec is going to be better because it's newer and a zvh is just a better cvh no one said they where better than zetec just like there are better engines than zetec but doesn't mean you shouldn't build a zetec engine because there is something better.

It's Czech Mate

The cam may well last with no oil, but the cam doesnt float on thin air now does it?

I dont think the zetec bottom end makes a better cvh, it makes a stronger one yes, but it doesnt ever drive as well

the restriction of the cvh head ( unless significanlty worked ) moves the torque curve down and power down the rev range

Feel sshit to drive unless a lot of cash has been spent on the breathing to cope with the higher capacity in which case it would be cheaper to do the zetec

I can see you have a bee in your bonnet about the zvh because you have one but i am being objective and stand by my original comment.

There is poor oil supply in the head, the valvetrain is poor compared to the zetec head, the long stroke makes them drive shit compared to a similar power 1600 cvh without serious breathing mods.

There is NO reason to build one unless cash is limited and you already have a cvh head with cash sunk into it. End of

It's Czech Mate

I'd say Karl covered it nicely in here https://passionford.com/forum/techni...r-false-2.html

You can make a nice ZVH, but by the time youve made the cvh head breathe you may as wel have gone zetec

unless you're just bloody minded

little bram

Haha I haven't got a bee in my bonnet mate am not that bothered what people do, but like ave said they are both good ways of getting more reliable power over cvh and I also said I would build one for my car but I don't want to so not going to if my car ever need a new engine now I would just get ride and buy a mk2 focus rs. I've also said zetec is better because newer just nothing wrong with been different. I like to see different thinks racing than just seen the same think.

b11lkw

I had a zvh that within 2000 miles snapped a valve spring and smashed a piston,
Had a zetec turbo built after that and wouldn't look back

frsjon

full zetec all the way for me now..