Trevor82012

Good day to all,

Can anyone advise the differences between the 2.5 engine in the Focus Mk2 RS and the Focus Mk2 ST.

Any comments is much appreciated.

2001ode

iTrader: (1)

Engine block, pistons, connecting rod, camshaft (inlet only I believe) flywheel, clutch, injectors.

Claude.

CosworthGuy

St runs higher compression than the rs and also they have different turbos

Trevor82012

Thank for the info. I did not think the bottom end was different. I was thinking cams, turbo and injectors.
Cheers!!

CosworthGuy

The st bottom end is quite weak im led to believe. You can buy a girdle from jamsport i believe for the block. Im sure this doesnt stop the liner issues though

Trevor82012

What liner issue. therefore I should autocrossing it.

MikeyRobbo

Common for ST's to crack the liners, has happened to both standard and modified ST's.

CrOwSoN15

As above, IIRC the exhaust cam is the same.

The RS had a re-work on the block to stop cracked liners, few people seem to know what was done, but it's been around for yonks with the Volvo boys!

JFB Tech

A friend of mine in the automotive manufacturing trade told me that Ford "Value Engineered" the Volvo engine when they started using it, one thing was reducing the liner thickness. This has obviously had a detrimental effect.

Trevor82012

Dam! does this mean that my high oil temperatures means, I have a cracked liner.

Trevor82012

Oil temperature goes up when driving hard. and in turn the water temp. goes up also. I am hoping the Oil cooler is failing. This is an easier fix.
If its the liner, any one knows where I can get RS liners.

sas

When racing my RS mk2 this year I would run with 110 deg C water and 130 deg C oil. Car still runs fine.

martysmartie

iTrader: (1)

Is the RS block not "plasma lined"?

Martin

Paynee

Am i right in thinking that the later ST's (around 08 onward) have had adjustments made to overcome this aswell as the RS engines, sure i have read this somewhere online. Although dont believe everything you read on the net!

sas

The plasma coated liners are a new take on honing. In stead of the oil sticking to the block wall in small scores, it now sit on a porous "plasma" coating.

knight7660

Also the RS engine uses a forged crank rods and Pistons from what I've read

CrOwSoN15

I think he would of learned what's what after the two years he posted it

knight7660

�� I always forget to check the thread date lol I hope he has learnt aswell