2.0 to 2.5

russell brown · 23rd October 2010, 22:09

just generally curious at minute, but am looking to do this if poss..
i am happy with conny se spec and bodys pretty tidy so attention has been focused on improving engine. from what i can gather the 2.0 is basically a 2.5 but with smaller bore??
if this is the case can you simply put a 2.5 block in or get original bored out. or is this a waste of time. i know it would be cheaper to sell mine and buy a 2.5, but as i say everything about the car is pretty tidy and keeping her till she ends up in the scrap yard in the sky.
enlighten me please.

chris75 · 24th October 2010, 11:55

I think it is done on the stroke , not the bore ?
In which case you would need to change the crankshaft and con-rods , possibly pistons .
The ECU is probably set up differently for fuelling , and the gear ratios are different .
Leave it alone

23rd October 2010, 22:09	#1
russell brown Loves to post mg zt cdti,mgf steptronic, citroen dispatch, ssangyong musso Join Date: Aug 2010 Location: dudley Posts: 382 Thanks: 2 Thanked 0 Times in 0 Posts	2.0 to 2.5 just generally curious at minute, but am looking to do this if poss.. i am happy with conny se spec and bodys pretty tidy so attention has been focused on improving engine. from what i can gather the 2.0 is basically a 2.5 but with smaller bore?? if this is the case can you simply put a 2.5 block in or get original bored out. or is this a waste of time. i know it would be cheaper to sell mine and buy a 2.5, but as i say everything about the car is pretty tidy and keeping her till she ends up in the scrap yard in the sky. enlighten me please.

24th October 2010, 11:55	#2
chris75 same car since 2005 2001 Rover 75 2.0 v6 Connoisseur Saloon Join Date: Nov 2006 Location: Ellesmere Port , Cheshire Posts: 3,818 Thanks: 379 Thanked 549 Times in 466 Posts	I think it is done on the stroke , not the bore ? In which case you would need to change the crankshaft and con-rods , possibly pistons . The ECU is probably set up differently for fuelling , and the gear ratios are different . Leave it alone __________________ Who said it was simples ?