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Discussion Starter #1 (Edited)
Hi

I'm Daniel from Poland

My current project is
Swapping 2.3L Into ST 2.0 block

I want to change the following in my 2.0L focus ST mk3 2017;
Piston heads from RS mk3 2.3
Turbo from RS mk3 2.3
Genuine Ford forged crankshaft 2.3 RS
Manley 2.3 Ecoboost Hbeam Rod set
Manley Ecoboost piston set ST
King main bearing set
King racing tri-metal rod bearings

I want 350HP to 400HP


can anyone describe to me exactly what I have to change in my ST 2.0 when replacing the head with 2.3?
and will there be any problem with this modification?
 

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Hi

I'm Daniel from Poland

My current project is
Swapping 2.3L Into ST 2.0 block

I want to change the following in my 2.0L focus ST mk3 2017;
Piston heads from RS mk3 2.3
Turbo from RS mk3 2.3
Genuine Ford forged crankshaft 2.3 RS
Manley 2.3 Ecoboost Hbeam Rod set
Manley Ecoboost piston set ST
King main bearing set
King racing tri-metal rod bearings

I want 350HP to 400HP


can anyone describe to me exactly what I have to change in my ST 2.0 when replacing the head with 2.3?
and will there be any problem with this modification?

You can hit those power numbers with the 2.0.
 

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Discussion Starter #3 (Edited)
Hi
Thanks for the suggestion
I dont want to overload the engine
I heard that it is better swap 2.3 to 2.0 block
I would like to have more power potential for the future (450HP)


1. Second engine complete 2.0 ST (7K miles)
2.Piston heads from RS mk3 2.3 complite (4k miles )
3.Turbo from RS mk3 2.3 (4k miles)
4.Ford Focus Rs Mk3 Cluch And Flywheel

my engine in car has code P0301 (misfire on cylinder) no compression 1 cylinder (12k miles only)
will now be replaced this broken engine
and this broken engine will be renewed

I have already bought parts almost new
















This is my car

 

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Nice Dude. **** If I had both, I would first try the 2.3's turbo and an down pipe exhaust like mine 3'' straight no cats or converter's inter-cooler. First just to save time and see what that does for gain. I had wondered if that was possible. So Congrats!
 

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Using the 2.0 block with a 2.3 crank you end up with a mismatch with the rods and pistons. You have a choice of running to big a squish # and low compression or having custom pistons made. See my mountain road racer build.
 

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Discussion Starter #6 (Edited)
Hi
Update
my engine is still under construction also replace cylinder liners
I bought Focus st 250 Ecoboost Stroker Kit 2.3



but I change pistons for RS MAHLE Motorsport
https://shop.marmotorsport.com/mahle-motorsport-piston-set-ford-ecoboost-23l-focus-rs-2829-p.asp

you can see the differences between the turbine ST and RS






web hosting png


this is the broken piston from the first cylinder



I bought a few more parts

Massive Speed trapped oil system - Ford Focus Mk3 ST


ARP Uprated Head Stud & Nut Kit for Ford Focus ST RS 2.0T 2.3T Ecoboost 151-4301
free image upload


ARP Uprated Main Stud & Nut Kit for Ford Focus ST RS 2.0T 2.3T Ecoboost 151-5407
 

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Discussion Starter #7 (Edited)
I bought another engine from RS for parts
and a new gearbox to install NEW
WAVETRAC DIFFERENTIAL
or
Quaife Differential

I want to have the whole set to change
engine and transmission
because I drive all the time now my ST











I have already prepared for modifications
Wagner Tuning Ford Focus ST Mk3 Competition Intercooler
cobb accessport V3
Big brake from RS front and rear
upload image online and share link

I'm waiting for the engine now
 

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First off you cant use the RS trans in your ST as the RS is all wheel drive and the ST is not. I'm not sure exactly what the one poster was talking about not being able to use the RS internals. People do 2.0 stroked to 2.3s all the time, and RS owners and high po builders use the 2.0 block for the 2.3 RS builds now because it's a closed deck. So everything is going to have to be bored and honed obviously to correct size.
 

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Discussion Starter #9
Hi
The new gearbox is from ST
simple work for replacement engine and transmission
when will the engine be built

I have only one problem


The exhaust cam on the 2.3 head is 4 lobe for the fuel pumps and the ecu in the ST is not set up to control it
maybe I can leave camshafts from ST to head 2.3 and change the high pressure fuel pomp from ST
or use
COBB Accessport V3 able to reprogram this to make it compatible with my ST (change it to 4 lobes from 3)

issues from stratifiedauto
we can tune the car but we have had issues with the fuel pumps so can’t guarantee the 2.0 ecu will be fine with the 2.3 pump and 4 lobe.
 
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