My 2.0 Zetec with ST170 head first dyno session

[piko]

Spec:
2.0 Zetec engine block (silvertop)
86mm(1,5mm oversize) wiseco 12.5:1 comp ratio 2050cc
Eagle rods
lightened and balanced standard crankshaft
Focus ST170 Head
ported
three angle valve job (factory valves 33,5mm and 28mm)
CatCams 293/285 degres with 12.7/12.2mm lift
Exhaust
factory Focus ST170/SVT header heat wraped
3" exhaust
intake/injection
hayabusa throttle bodies enlarged by 2mm
Megasquirt ECU
440cc injectors
cooling
Davies Craig electric water pump with controller

First dyno session fuel maps and minor ignition timing tuning. Cam timing, ignition timing and trumpet lenght adjustments to come.

For now:

269.9HP@7500rpm and 261Nm(192.5lb/ft)@6150rpm

[piko]

Ignore the wrong date. It was on the dyno on tuesday.

The Mondeo is gone and the Fiesta took it's place.

Here's a vid:

[Doug@g19engineering]

270 bhp. Very impresive.

[escortinadriver]

Very impressive

Makes the pinto to zetec conversion that bit more appealing....


Shaun

[Zetec_RS]

Is their any difficulty in adapting the ST170 head?

[RWD fords rule]

Great engine there mate
Who made the intake manifold to suit your hayabusa tb's?

What modifications did you need to do to fit the ST170 head onto the silvertop zetec bottom end?

Any pics or other video's of the engine?

Thanks

Jason

[Jamie_mk1]

who done your cylinder head mate? thats a mighty zetec

[piko]

Great engine there mate
Who made the intake manifold to suit your hayabusa tb's?

What modifications did you need to do to fit the ST170 head onto the silvertop zetec bottom end?

Any pics or other video's of the engine?

Thanks

Jason

The intake manifold is a modified DCOE piece. The bodies have DCOE flange welded on.
Custom made by me. Looks rough on the outside but does the job.



When using a silvertop block you need to play with belt tensioner arrangement. The head fits strait on.



The head was bought in USA allready ported. Just had the valve seat cut to three angles.

[Rainbow]

Top stuff Piko, Don't suppose you have any picture of the inlet manifold off the engine do you to show how its made?

[Adam B]

yes mate, proper animal!

[piko]

Top stuff Piko, Don't suppose you have any picture of the inlet manifold off the engine do you to show how its made?

The inlet manifold is a Zetec DCOE item. The throttle bodies are welded to a DCOE flange that bolts to this manifold.

Jan

[trig]

Any more details on the engine spec mate as I spoke to the guy at cat cams today he said that to use them cams you need uprated followers and steel rods forged pistons that have pockets in them for the valves.

have you done any of this as he also said you would need to rev the engine to min 8K to get the best outa the cams.
hence the steel rods!

Dont the ST engine have steel rods as standard???
And forged pistons???

[piko]

With the 2301016 Catcams I'm using OEM followers with their uprated valvesprings. The head needed to be modifyed for the cam lobes to clear.
Since I have a silvertop bottom end I needed to go forged anyway. The pistons are custom Wiseco with apropriate pockets.

The restrictive OEM ST170 exhaust manifold is the reason peak power is not at 8000 revs.

I belive the ST rods are forged and the pistons can probably have smaller pockets made to accomodate higher lift cams, if necessary

[trig]

With the 2301016 Catcams I'm using OEM followers with their uprated valvesprings. The head needed to be modifyed for the cam lobes to clear.

Since I have a silvertop bottom end I needed to go forged anyway. The pistons are custom Wiseco with apropriate pockets.

The restrictive OEM ST170 exhaust manifold is the reason peak power is not at 8000 revs.

I belive the ST rods are forged and the pistons can probably have smaller pockets made to accomodate higher lift cams, if necessary

Thanks for the info dude

[RETRO_AL]

Impressive fiqures

[piko]

BTW there was a FOCUS ST170 running 290HP with simmilar spec to mine. Mike Webb racing or something like that.

[trig]

Im looking for 220 realy as thats 50 more than I got now should give me a bit more of what I like maybe go for more at a later date???

[neilm]

Isnt there some law of physics that says the Torque & BHP lines on a dyno should cross at 5250rpm ?

I struggle to believe an N/A Motor can make 100bhp more than the standard ST170 with standard valves. Will they really flow enough in their standard form to make the extra 100bhp ?

[Graham]

--------------------------------------------------------------------------------

Isnt there some law of physics that says the Torque & BHP lines on a dyno should cross at 5250rpm ?

yes the should, if they dont theres something wrong with the graph or the figures have been fudged

the formular for bhp is

bhp = rpm x torques/5250

torque = bhp x 2550/rpm

struggle to believe an N/A Motor can make 100bhp more than the standard ST170 with standard valves. Will they really flow enough in their standard form to make the extra 100bhp ?
__________________

im not so sure on that one, although with the right shpe ports and other mods, afterall my race engine is still on std size valves and makes 140bhp more than std, that said it has been stretched 500cc and is full race spec, so it might be possible

[piko]

Isnt there some law of physics that says the Torque & BHP lines on a dyno should cross at 5250rpm ?

I struggle to believe an N/A Motor can make 100bhp more than the standard ST170 with standard valves. Will they really flow enough in their standard form to make the extra 100bhp ?

The lines will only cross at that point (5250rpm) if you use BHP and lbft as values with the same scale.

My graph displays HP and kgm (Nm/9.81) and different scale.

Power and tourq will allway be connected with an equation so the couldn't be a mistake here.
False reading can only be due to friction losses through the drivetrain. 10HP+- most likely and 260hp is still good.

A well ported ST170 on standard valves will flow enough for over 300HP N/A as stated by CNCheads.

[dobuy]

bloody good result there, is it a Ford Racing head you got, or somewhere else??

[Svein]

Did you use something like these




http://cgi.ebay.co.uk/DCOE-CARB-THRO...mZ110447318614

[Graham]

The lines will only cross at that point (5250rpm) if you use BHP and lbft as values with the same scale.

My graph displays HP and kgm (Nm/9.81) and different scale.

arhh yes that makes sense

[piko]

Did you use something like these




http://cgi.ebay.co.uk/DCOE-CARB-THRO...mZ110447318614

Yes, like that, but made it myself. You will need TWO of these btw.

[piko]

A rought representation of the intake port size differece betwen ST and Zetec head.
From bottom to top of injector port and width of the port are the same on both. But the port seeling is much higher on the ST as you can see. It looks like a 10-15% increase in port volume over the standard Zetec.

[RETRO_AL]

How come you used a silvertop bottom end instead of the bottom end used on the st170?

[neilm]

im not so sure on that one, although with the right shpe ports and other mods, afterall my race engine is still on std size valves and makes 140bhp more than std, that said it has been stretched 500cc and is full race spec, so it might be possible

Thing is Graham, if you start with a 'cooking' model engine you can wring loads more out of it, but Ford have already had at least 40bhp out of the ST over a standard Zetec, to then take a further 100bhp just seems a little bit 'optimistic' to me.

I hope I am wrong, so when my black top goes phut I can replace it with an ST and see 80bhp more than I have now.

[trig]

Im hoping for 220+ ill be happy with that

me mate got one in his anglia (with one of you manifolds neil) he's seeing 191bhp at the wheels think that very good?

[piko]

How come you used a silvertop bottom end instead of the bottom end used on the st170?

Because I could just get the head, and I had a silvertop bottom end and I got a good deal on the rods(300$) and custom Wiseco pistons (500$).

[piko]

Thing is Graham, if you start with a 'cooking' model engine you can wring loads more out of it, but Ford have already had at least 40bhp out of the ST over a standard Zetec, to then take a further 100bhp just seems a little bit 'optimistic' to me.

I hope I am wrong, so when my black top goes phut I can replace it with an ST and see 80bhp more than I have now.

The ST head is overengineered for the 170HP it puts out.
I'm shure the engine was designed to have around 200HP, but was detuned because of plans for the RS.

[trig]

O and this is the same head as they use on the focus RS and it flows ok in that?

I know someone with a RS thats running good power on gasflowed head (not ported just cleaned up the standard head).

[piko]

O and this is the same head as they use on the focus RS and it flows ok in that?

I know someone with a RS thats running good power on gasflowed head (not ported just cleaned up the standard head).

Nope, the focus RS head is a normal 2.0 Zetec.

[Sonus]

So this isn't a Ford Racing CNC'ed head? Wonder what's the difference between an ST head and the Ford Racing CNC'ed heads reguarding flow rates.

[trig]

Thought the RS was an St with turbo???

[piko]

Thought the RS was an St with turbo???

Nope, just a Zetec head.

[trig]

A mate poped over yesterday and stripped the engine here's what I've now got

[trig]

Just found this http://images.google.co.uk/imgres?im...%3D2%26hl%3Den

[trig]

And this one http://www.fordst170.co.uk/specs.php

[trig]

This be any good?
http://www.pumaspeed.co.uk/showdetails.php?id=470

http://www.pumaspeed.co.uk/showdetails.php?id=49

http://www.pumaspeed.co.uk/showdetails.php?id=49

[ncoll1]

So this isn't a Ford Racing CNC'ed head? Wonder what's the difference between an ST head and the Ford Racing CNC'ed heads reguarding flow rates.

Hope this helps, the bottom line is a standard zetec, the second one up is ford racing,CNC head, the third one is a ST170 and the top one is one of my black top flowbench developed fast road heads.
Sorry about the quality of the graph

ncoll