Focus st170 engine

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18 May 2007
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851
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Swansea
I've been looking at getting a Mk 1.5 focus (on around an 02-04) plate and much prefer the st170 interior, and the prices for the cars are more than acceptable but the insurance is silly for a relatively small performance boost over the standard range. As such I'm now looking at the 1.8l TDCi (115ps models) in various trims (would like leather seats, and the tdci looks nicely remappable :) ).

But just out of curiosity I was just wondering what made the st170 engine different from the zetec/duratec 2.0l engine - parkers lists the mpg to be only 1mpg less than the standard 2.0l (and better than the auto) despite the added 30 odd bhp.

So is parkers wrong, or are there fundemental differences? If so can the standard engines be upgraded fairly cheaply by replacing a select few components or is it more of a cumalative effect and not worth considering?
 
Well I only know a little bit of what is changed. It has a larger air intake snorkel so that is less restrictive. Though I bet it also has slightly wilder cams too. Also the exhaust is a larger bore.

Though they often don't even make 170bhp on rolling roads, I saw one only make 152bhp. Only half hour later my 1.6 made 107bhp on the rollers.
 
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