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[MickAP]

Being a tractor owner and never owned a petrol Miggy I just wondered which is the better engine, or more reliable engine 2.5 or 2.6 if any at all. And why did they do a 2.6, after all the difference in cc is small or am I missing something else.............sorry if too many questions.

Mick

[tunnie]

2.6 replaced the 2.5 due to stricter emissions regulations.

2.6 has all electrical drive system, where as 2.5 was cable driven.

2.6 has snooped plenum, as fitted to later 3.0/3.2s - It actually did not need the extended plenum, but they had to fit it to squeeze the DBW stuff on.

Early 2.6's suffer from leaking steam seals as Vx, in their wisdom decided to use cheaper parts. Later 2.6's don't seem to suffer from this problem.

In short, nothing to chose between them, unless your like me and lazy, the DBW cars have a lighter throttle as its electronic. Its something i notice driving the 3.0, the pedal is harder to press 

[tmx]

2.6 is a newer verasion of the 2.5 with OBD 2 No EGR Valve Coil perplug ignition and a few other small revisions sort of an improved 2.5 some may say

imho from spending 2 years on this forum theyre both reliable units

the standard 2.5 is 167bhp i dont know the 2.6s bhp i know a Vectra 2.6 GSi is 192bhp though but i dont think the omegas 2.6 is 192bhp

[Martin_1962]

2.6 is 178 I think standard, mine isn't.

I think mine is around 190 - 195

2.6 is a good engine, no EGR no SAI, east to fit cruise.

Valve seals the biggest pain

[patriotste]

Go for th 2.6 its an improved version and is only fitted to the facelift models which also have better corrosian protection.

[RobG]

2.6 replaced the 2.5 due to stricter emissions regulations.

2.6 has all electrical drive system, where as 2.5 was cable driven.

2.6 has snooped plenum, as fitted to later 3.0/3.2s - It actually did not need the extended plenum, but they had to fit it to squeeze the DBW stuff on.

Early 2.6's suffer from leaking steam seals as Vx, in their wisdom decided to use cheaper parts. Later 2.6's don't seem to suffer from this problem.

In short, nothing to chose between them, unless your like me and lazy, the DBW cars have a lighter throttle as its electronic. Its something i notice driving the 3.0, the pedal is harder to press 

No problematic ICV either

[tunnie]

2.6 replaced the 2.5 due to stricter emissions regulations.

2.6 has all electrical drive system, where as 2.5 was cable driven.

2.6 has snooped plenum, as fitted to later 3.0/3.2s - It actually did not need the extended plenum, but they had to fit it to squeeze the DBW stuff on.

Early 2.6's suffer from leaking steam seals as Vx, in their wisdom decided to use cheaper parts. Later 2.6's don't seem to suffer from this problem.

In short, nothing to chose between them, unless your like me and lazy, the DBW cars have a lighter throttle as its electronic. Its something i notice driving the 3.0, the pedal is harder to press 

No problematic ICV either

Nothing wrong with ICV's we had one Omega that did 130k in 3 years, never missed a beat. That was a 4 pot too 

Our 3.0 ICV has also never given us any problems, its all about preventative maintenance 

[MickAP]

2.6 is 178 I think standard, mine isn't.

I think mine is around 190 - 195

2.6 is a good engine, no EGR no SAI, east to fit cruise.

Valve seals the biggest pain

Sounds expensive to fix if a problem with em?

Mick

[deviator]

.....I know a Vectra 2.6 GSi is 192bhp......

The 2.5 GSI vectra is 192 the 2.6 is mid 170's. However the 2.6 has more torque.

As for which to go for, I prefer the 2.6. I will say that some parts are 2.6 specific and can be difficult or significantly more expensive than the 2.5 counterpart (no punn intended). The 2.6 didn't exist for very long.

For example the MAF is 2.6/2.5 specific.

[Kevin Wood]

For example the MAF is 2.6/2.5 specific.

2.6 MAF is the same as 3.2. 

As said, not much to choose. Main plus point is that cruise enable is very easy on a 2.6. EGR/SAI missing, but SAI is easily ditched anyway and EGR does give some efficiency benefits.

On the down side, around 2001 dodgy stem seals were fitted. DBW throttle is great when it's working but is more expensive than a failed throttle cable when it's not.

You have cat monitoring on the 2.6 so can get into cat efficiency problems, although they are much less afflicted than the 3.2.

Kevin

[Marks DTM Calib]

2.5
Air Injection - not unreliable
EGR - not unreliable
DIS packs (if they get wet!)

2.6

Cat efficiency Issues
Stem Seal Issues
Coil per plug setup can fail
MAF sensor issues