fiestaturbo.com

[luke_mk3_st]

right, what is actually different between the cosworth engine and 2.0 zetec engine ? becuase i see cosworths that push out 600bhp easily and 800 - 100 bhp on the one off, were as even a properly built zetec seems to only be capable of 450 - 500 max! so what is the actual difference why are they capable of so much power ? and also what does the term ring wire mean ? as in iv heard a few people say that have had the block ring wired ?

[cowie20]

id have to say its done to the cosworth engine maybe having a larger piston size, stronger internals, a inlet that is individual bodies, rs500 came with 8 injectors. maybe just because the engine was built as a turbo engine.

to be fair tho people are now getting same power from zetec engine. i seen a video of a mk3 fiesta drag car on youtube doing like 9 sec 1/4 miles..think that was its time.

wire ringing involves machining of the block face to insert a 1mm wire that protrudes slightly above the block face to both increase cylinder head fire ring clamping and prevent the head gasket from blowing outwards!

[luke_mk3_st]

hmm ok. only because the engine iv built is the following spec.
blacktop 2.0 bottom end "brand new block from ford" with eagle rods, diamond racing pistions. and im running it with an st170 head and its also going to be turbod running on omex managment!
im thinking it must be capable of 450bhp! but if it isnt then i will sell it and do a cosworth conversion...

[FRSJON]

as cowie said the bore on a zetec is around 85mm ,on a cossie its more 95 so the larger bore has to help...

[luke_mk3_st]

as cowie said the bore on a zetec is around 85mm ,on a cossie its more 95 so the larger bore has to help...

this would explain more torque. but realy why its a better and capable of more power engine?

ps dont take that as in i think your talking bull.. not the case at all. im just trying to find out the real differences

[MB7201]

There's going to be a lot more motorsport development with the cosworth aswell as they were something like 500bhp in the touring cars? Is there much at all with the zetec? I'd only guess a bit with rallying.

[luke_mk3_st]

i understand what your saying about the cosworth being devolped by motorsport. witch leaves us to devolpe the zetec! lol. but i just mean you can have a standard yb cossie engine. and next to it properly built zetec engine alll day long people will choose the cosworth engine. is is purely because its a cosworth lump.. say for instance the crank on the cosworth doesnt break! wear as the zetec one will at 500bhp! but then you can buy a steel crank if you got the cash... which still leavs my question of whats the big difference between the two...

[cowie20]

cosworth crank was designed for turbo application so would take more abuse.. zetec one never was....but i think the crank in a N/A blacktop zetec is same as focus rs mk1.

at a guess id say the cosworth has larger valves aswell. and it ran a dizzy. and people would choose a YB over a zetec because there just the funlumps!

the cosworth yb was made for motor sport and rallying but it is based on the old pinto blocks.

[luke_mk3_st]

cosworth crank was designed for turbo application so would take more abuse.. zetec one never was....but i think the crank in a N/A blacktop zetec is same as focus rs mk1.

at a guess id say the cosworth has larger valves aswell. and it ran a dizzy. and people would choose a YB over a zetec because there just the funlumps!

the cosworth yb was made for motor sport and rallying but it is based on the old pinto blocks.

i herd its the same crank aswell. as the focus rs mk1 is basicaly just a 2.0 blacktop.
im going to have a look and see what the valve sizes are and ports compared to the st170 head. dont get me wrong people i will own a cossi one day! i have to! lol just i basicaly have the majority of the zetec already. and also this topic has always been on my mind.

[luke_mk3_st]

exhaust valves are 3mm bigger. and the inlet are 1.5mm bigger.

[luke_mk3_st]

i just found a very interesting post on another site. this looks very powerful for a N/A engine take a look.
anybody no what power im to expect with my setup ?
blacktop zetec brand new bottom end, with eagle rods, diamond racing forged pistons. st170 head, custom manifolds. probably a gt30 turbo, omex 600 managment, "maybe throttle bodies and turbo" ?
http://www.turbosport.co.uk/showthread. ... no-session

[luca]

The only reason there are not Zetec turbo's YET that you know of reaching 800+hp is due to ££££ and people willing to spend it.

The current UK max HP from a zetec is Paul Johnsons, this is running 570hp.

The YB engine however has been around for far far longer and was from the start designed to be running big power, a zetec was only ever set to run 130hp ish!
There has been only a handful of engines built running a genuine 400hp+ from a Zetec.

WHY!!! because most people wont spend 10k on there car to achieve it!
Its far simpler to buy a cosworth and tune that! rather than your Fiesta zetec!!!

You mention a drag Fiesta that is Szaybk's and is running around 550hp soon to be back for more!!!

Now the mis-conception on the crank! 500 being its limit!... Well there are 4 engines I know of running more than this and there still going strong.
THE WEAK AREA ON THESE ENGINES IS THE OIL PUMP to which everyone who owns one KNOWS!

600hp! Then I would think about changing the crank!...

If you want 700hp out of a ZETEC it can be done, just be prepared to test some specs and fund differnt specs each time!...

First port of call would be a phoneall to SCS - They currently have the 570hp Zetec spec!

[cowie20]

to be honest it doesnt take much to get around 250- 300 bhp from a zetec turbo...mines has only cost me about £1600 for everything and am hoping for 300 on current injectors with upto 350 with some bigger ones, but most people now are sticking these zetecs in mk1/2 and 3 fiestas thats a hell of a lot of power in a car that weights sweet feck all.

[FRSJON]

The only reason there are not Zetec turbo's YET that you know of reaching 800+hp is due to ££££ and people willing to spend it.

The current UK max HP from a zetec is Paul Johnsons, this is running 570hp.

The YB engine however has been around for far far longer and was from the start designed to be running big power, a zetec was only ever set to run 130hp ish!
There has been only a handful of engines built running a genuine 400hp+ from a Zetec.

WHY!!! because most people wont spend 10k on there car to achieve it!
Its far simpler to buy a cosworth and tune that! rather than your Fiesta zetec!!!

You mention a drag Fiesta that is Szaybk's and is running around 550hp soon to be back for more!!!

Now the mis-conception on the crank! 500 being its limit!... Well there are 4 engines I know of running more than this and there still going strong.
THE WEAK AREA ON THESE ENGINES IS THE OIL PUMP to which everyone who owns one KNOWS!

600hp! Then I would think about changing the crank!...

If you want 700hp out of a ZETEC it can be done, just be prepared to test some specs and fund differnt specs each time!...

First port of call would be a phoneall to SCS - They currently have the 570hp Zetec spec!

thats the most ive seen you write on here in months.... very well put though...

[luke_mk3_st]

thats the most ive seen you write on here in months.... very well put though... [/quote]

haha this topic must of tickled his fancy.

i get what your saying. so basicaly anything is possible if your pockets are deep enough