Russ Payne

Hi peeps, rebuilding my escort rs turbo engine and want around 250 bhp, what is going to be better a cvh or zvh, going to be running cossie managment

Dan

Would think if you've got a CVH already there set to be re-built then the better option is to use the engine you've got and stay CVH

Think ZVH will produce more torque but as we all know the CVH can now handle 250+hp all day long if built correctly HTH

Charlie Chalk

iTrader: (1)

CVH

Oranoco

CVH for me twice

thelynx

If your changing the managment anyway, why not go 16v ?

addiction

CVH

FULLBORE

if your changing management then you might as well go 16v as this option really is the ultimate,and less agro than messing about with the zvh bits.if you sticking put,then you might as well stay cvh.

Rick

16V is damn expensive to do properly.

DazC

iTrader: (1)

CVH. It's the easiest and will still give very good results....

As Rick said, to do properly costs money.

thelynx

Yeh but so is the cvh.... Still have to shell out for pistons and rods and such, so may aswell do the valver but everyone has different ideas and opinions...

stuart collins

iTrader: (7)

cvh

DazC

iTrader: (1)

But the correct way to do a Zetec is to revise the rod angles which means a new crank as well. The CVH won't need the crank as it already has a decent rod ratio...

DanRSturbo

CVH

Rick

The std pistons and rods will do 250 on CVH. Std Zetec pistons wont. You need a new crank for the zetec, you DEFO need efi, and u need headwork which costs twice as much as say a cossie head...... So if u want 400hp then go for the Zetec.

paconassa

CVH!!!!

talk to karl @ norris motorsport...

jezRS

id go for cvh if i had a chance to go bk in time, and id go to AP Tuning!

adamS2RST

CVH

thelynx

Not what I have been told by Zetec expert... Yes you need pistons, you do not need crank unless your going for stupid power and head is fine also for around 300... standard bottom end on cvh doing 250bhp id rather not..

But its you bank account and opinion.. I'll stick with the zetec idea

Rick

thelynx

the point is it's still expensive. The zetec bottom end is long stroke, and is under much more stress than the CVH. 300hp on std rods is a big no.... The head may do 300hp, but then ur still firmly in cvh land - so again - it's a lot of money for no gain...

DazC

iTrader: (1)

I have to agree with Rick. The Zetec crank is too long, so to do it properly requires a revised crank...

The rods are no stronger between the CVH and the Zetec...

Oranoco

Mate of mine made 316bhp on his ZT on stock crank and rods. His new build is over the 400bhp mark and retains the stock cracnk but has rods and a whole host of other bits. The engine cost more to build than the deposit I need for a house

ZT are incredible but CVH all the way for me everytyime as I looked into the ZT thing and it's just too damn expensive to do properly

chelseabully1

so what does he need to do to get his 250 bhp from cvh with cossie management safely

JimmyBoy

iTrader: (1)

Why is headwork on a zetec so expensive ?

Rick

Because the head is designed for economy & emissions- which is actually why it has 16 valves. The cosworth head is obviously a peformance head as std, and takes a hell of a lot of beating. The cvh hemi head as used on the RST, has HUGE valves as std, and mainly needs work round the valve seats - and shaping of ports. The zetec head has to be totally reworked to convert it from emissions to peformance. It takes twice as long as a cossie head to port - which should give u some idea on price!

JimmyBoy

iTrader: (1)

Thanks.

thelynx

Why are there so many disputes on this conversion? I spoke to Ian howell the other day and he said 260-270bhp on stock rods with arp rod bolts will be fine and standard head good for 300bhp.. Standard crank is also fine for well over 300bhp... This guy knows about his engines so why do people say you cant do this or cant do that... pub know alls

JimmyBoy

iTrader: (1)

I think the crank is fine for 300-400bhp, but I think what they are saying is that it isnt the best of "stroke"'s, the cvh has a better stroke.

But again, I think this comes down to personal preference etc..., do you want an engine that you are going to be driving hard, or one where you can put it in gear and let the torque do it's thing!

It's all down to personal choice IMO - Zetec for me though!

thelynx

I like both torque and ragability maybe I stay with the cvh then People have a tendency on PF to make you think otherwise if they dont agree on your idea... Cvh engines are annoying most of the time

JimmyBoy

iTrader: (1)

I know what you mean, if your idea isnt the same as someone else's, then it WRONG, lol!

My cvh was nothing but a nightmare, probablly had a bad one etc.. etc.., but personally prefer the zetec 16v route to the cvh or zvh option.

thelynx

Me too, despite it being more pricey, but then not if you can find bargains from you.... I think I'll end with a better finish with the zetec route

JimmyBoy

iTrader: (1)

Well, I hope you realise that part of the deal was that you have to sell me your whole interior for Ł30 as mines a bit shabby! lol

thelynx

JimmyBoy

iTrader: (1)

Rick

I'm an engineer - and i have no problem with people trying differnt things at all - if u want to do something, then above all thats what matters.

My points are, that there are a lot of fundamental flaws. I would like a big power zetec, but firstly i would have to sort out the flaws. The rod stroke ratio is all wrong - which ios kind of important on a peformace engine.

thelynx

Yeh thats fine, but so many have been built now without any trouble, and also without your argued problems being fixed.. Do you see any problems with there engines?

Speedy Gonzalez

stick with the cvh i had a zvh in mine running 220bhp and all it did was
spew out oil and overheat

thelynx

Were not on a about the zvh, were talking about the 16v route

Rick

Only problems will be power delivery - quite a low down power band - which is what some people like.

Badman38

iTrader: (2)

well Obviously not built properly

Drjones

so whats the big problem wiv ZVH?