capri-rs

have a capri that used to have a yb engine,now im looking at other alternatives.

narrowed it down to zetec or duratec.

need the pros and cons about each engine.

if i go zetec it will be the st 170 engine as a base

if i go duratec it will be the 2.3 version

will be turbo off corse

looking for around 350-400 bhp with good driveability.

cheers

muz

I'd say the 2.3 Duratec. Jimmy has one in his Mk 3 Fiesta, Theres a project page on here. Running a GT28R turbo its making around 300BHP at 9-10 PSI IIRC.

SiST

iTrader: (1)

Be different and go for a duratec. I am making a 2.3 turbo duratec at the moment

esh

Saw the thread title and got interested! Yeah I have the 2.3 version in my MK3 Fiesta (obviously FWD layout though). I'm only running it at just over 0.5 bar for running-in but the torque and responsiveness of this engine is so addictive.

The all-alloy Duratec is a good 40lb lighter than a Zetec, which is worth noting.

There is also a 2.5 / 4-cyl version of the Duratec out now that is the same external block casting as the 2.3. I think it's in one of the later Mazdas and some of the 2009/10 US Fords.

I do think the iron-blocked, Black-Top Zetec is a very nice engine though. They're really smooth, make good power and are reliable - you can still find new crate-engines around for reasonable money, bung in some Wossner pistons & PEC rods and you're ready for some fun.

The YB is a fantastic engine and there's no denying its motorspot pedigree but I'm always far more interested when I see a Classic RWD Ford with a Zetec Turbo or Duratec under the bonnet. It's just something you don't see quite as often, so it stands out a bit more.

muz

Wow typo there, 9-10 BAR I meant 9-10 PSI

capri-rs

seen the 2,5 duratec in the newer fords but dont know if thats available in europe.
the 2,3 seems easy to get hold of.

have 2 yb project ongoing so thats ruining my wallet.cant aford to fork out more money on yb parts at stupid prices.

thats why i want something easier to get parts for

Chaz888

big sd1 v8 twin turbo! had a hi comp 3.6 in a mgb feking great!

capri-rs

thats the thing dont want any rover,honda,bmw,nissan,toyota engine.

want a ford.period!

Chaz888

ah just thought of this one v6 duratec 3l turbo like in the noble light compact still lots about and will give you the power and stay in one pice!

tabetha

What about a 2L X flow engine, with turbo, nice and dead simple, never seen it done yet either so you could be the first ?
tabetha

capri-rs

x flow is just not my first choice of machinery.

want 16 valves,modern engine

esh

Thing is though, the 1.8/2.0/2.3 Duratec's (and also the V6 Mondy ones?) are really Mazda engines. The 5-pot in the Focus ST/RS MK2 are Volvo. If you really want a true Ford bloodline then Zetec or trusty old YB

Personally I can still sleep at night knowing the heart of my car is a Mazda design

I like the idea of using the ST220 3.0 V6 with twin turbos like in the Nobles. Tried and tested, will fill a Capri engine bay nicely and will not be as stressed as a smaller 4-pot if properly built.


Ha I did notice that typo! I bet there's a lunatic somewhere who's tried that amount though!

Chaz888

the v6 is not mazda its the other way ford suppled to mazda its a ford / cosworth engine ,cosworth helped with the heads

esh

Crikey, didn't know that - every day's a school day!

Chaz888

im such a train spotter go with the st220 lump all the tec is out thare so will make the swop out easy-er ish have put a sd1 in a 1967 mgb one of only two i know of the other was in a mag convertions are all in the small details

clairendave

mazda 3, 5 or 6 mps engine. as said above the duratec (all alloy) is based on this. the mps is 2.3 turbo. 260ps from the factory, and i belive you can use an mx5 gearbox straight on it. they are cracking engines untill you get to VERY high boost then they do actually crack !!

caprizetec170

zetec is handy enough fit in capri izve got st170 supercharged one in mine with mt75 box.
depends how much ya want spend ya could get 2.3 duratec engine+ box out of mx5 and get off shelf turbo kit.
Or focus rs engine mated to T5 box probably easyier stronger option

zetaboostboy522bhp

zetec all the way , lots of parts of the shelf and are provern to 500bhp, duratec is a big problem if your running 400 bhp , the blocks are shit and cannot take more than 15 psi reliabily. ian howell spent a fortune trying to develop this engine and all he got was a big bill , he had a custom head , custom inlet , pistons , rods , crank , custom solid cruddle , t 76 turbo , 8 injectors etc etc . now his engine was making great power 476bhp @ 10 psi but thats where it ended , split the blocks corner right off , 3 inch x 3 inch piece. as he spent lots he looked into other options , theres a special american mazda drag racing block which they run to 1400 bhp on meth but machining the waterways back into the block and the $8000 price put him off.
hope this helps and good luck with what ever you choose
it nice to see something different.

cheers paul

capri-rs

thanks for that info.

if i go zetec what would be the best starting point?

have a silvertop & a blacktop 2.0 lying around.
what about the st170 engine?

zetaboostboy522bhp

to be honest black top are more widly available now , they have a baffled sump as standard , a very slightly better flowing head in mild tune, and you can also get uprated oil pump gears for the pump which is a must and dont rev it past 7800 rpm.
dont be put off by the silver top engine it will match the blacktop in every aspect including the cylinder head when modified as the first 3 engine to reach 500bhp+ where silvertop engines but the oil pump is a massive problem , and the only real solution is to dry sump the engine which will cost around the Ł1500 mark but i would on a drag / track car anyway.
as a starting point i would do the following

overbore to 2.1 litres
decent forged pistons
h beam rods
standard crank
standard head with double valve springs
standard cams
custom inlet
custom equal lenght manifold
650 cc injectors
and stand alone management like pectel t2
gt30 , t34 , t4 , gt28 turbo the choice is yours really
all this and you should see a real 350/400 bhp

hope this helps

cheers paul

capri-rs

thanks again.

looking at cncheads website and the standard st170 flowes more than a std cossie according to them.

is the st 170 based on silvertop engine or blacktop ?

if not are the crankshafts interchangable?

chaffe

the silvertop and blacktop blocks are essentially the same as is the st170 block. cranks are all the same, rods are different lengths and pistons vary.

capri-rs

thanks again

ok where to start looking for a proper head?

crazycage

what power do you want?

capri-rs

looking for 350-400 bhp with good driveability,but with the option to have more

hoping to match a yb with greys,t34 etc etc

crazycage

a standard blacktop head with a set of up rated valve springs will see that power .

rsmark86

iTrader: (3)

duratec is more tunable but the zetec is cheaper to built...

ive seen duratec's in normaly aspirated form pissing 300bhp which ive never heard of a zetec doing that...

2lt duratec with nothing done apart from throttle bodies and a exhaust manifold has seen 210bhp... lol very tunable

zetaboostboy522bhp

area six motorsport big valve head is all you will need , he uses cnc heads for the custom machine work and then adds his own spec bits, you will see 500+bhp from both silvertop and blacktop and maybe a tad more from the st170 head. most people tend to use his stuff like valve springs so it would be worthwhile phoning him for a chat.
the big valve head is around Ł1350 and all you need is a inlet cam in mild tune to get 522bhp @ 30 psi.
duratec are good NA , but shit as a boosted engine if your running over 15 psi

cheers paul

chaffe

Cant beat an iron block for the boost IMO