2.2 to 2?5 conversion.

Jun 28, 2020
227
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72,388
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Caravaning since 2010
Anyone have any knowledge of converting a g9t 2.2 to 2.5 apparently they are the same block head etc different bore etc. But with same turbo ECU etc.

According to vauxhall owners club members it's possible. waiting to become a member.

I have had the van off the road for 3 months due to issues with the engine and garage covid etc.

Cheers James
 

TheBig1

LIFE MEMBER
Nov 27, 2011
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many many years! since I was a kid
It may very well be all the same, with the same model ECU, but likely running a different map in the software to account for different fueling and timing. If I was going to take on such a conversion, I would buy a complete donor vehicle, with matching ECU pump and other essential parts. Anything left over is then sold to cover some of the cost
 
Feb 15, 2014
427
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cambridgeshire
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30,113
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Bessacar E450
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newbie
Anyone have any knowledge of converting a g9t 2.2 to 2.5 apparently they are the same block head etc different bore etc. But with same turbo ECU etc.

According to vauxhall owners club members it's possible. waiting to become a member.

I have had the van off the road for 3 months due to issues with the engine and garage covid etc.

Cheers James
I doubt the block would be the same internally, so might not be able to bore it enough for bigger pistons

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Feb 15, 2014
427
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cambridgeshire
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Bessacar E450
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newbie
looks like its bigger bore and longer stroke so you would need crank and rods as well, better to get a complete 2.5 and fit that I would have thought
 
OP
J
Jun 28, 2020
227
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72,388
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Van conversion
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Caravaning since 2010
I was thinking the whole engine.

Not including auxillary parts obviously but if I could get one with everything in place that would save me / garage time.

Cheers James
 
Feb 16, 2013
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50 years
I have a master with 2.5, which I'm afraid that's all I know about, and as far as I can tell it's a different gearbox and loads of other things, when I have looked for spares there isn't much that's the same.

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OP
J
Jun 28, 2020
227
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72,388
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Van conversion
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Caravaning since 2010
Thanks I'll check with French auto specialist tomorrow.

Cheers James
 
Dec 24, 2014
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Ever since Mother was a lad.
Presumably the 2.5 has a different state of tune otherwise it would be hardly worth increasing the capacity for the sake of just an extra 300cc........ or do have to replace the engine and you already have a 2.5 engine available? :unsure:
 
OP
J
Jun 28, 2020
227
125
Funster No
72,388
MH
Van conversion
Exp
Caravaning since 2010
The reason is that the 2.2 is rare only 2 years approx and has issues which were sorted somewhat when they reverted to 2.5.

Finding another 2.2 will be hard as they are always being replaced n and the 2.5 is common.

Cheers James

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OP
J
Jun 28, 2020
227
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Van conversion
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Slight update the French specialist suggests that a crankshaft breather pipe us blocked and so that is forcing oil out of the seals - plausible??

Cheers James
 
Dec 24, 2014
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Hurstpierpoint. West Sussex.
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Compass Navigator
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Ever since Mother was a lad.
Slight update the French specialist suggests that a crankshaft breather pipe us blocked and so that is forcing oil out of the seals - plausible??

Cheers James
Yes, that could happen, but you haven't actually said in any post what the problem is with the engine!

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OP
J
Jun 28, 2020
227
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Funster No
72,388
MH
Van conversion
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Caravaning since 2010
Hi sorry that's because I'm not actually sure!

Pushing out oil.

Renault specialist suggested it's possibly a breather pipe that's blocked.

It's in the garage do my hands are rather tied. He's going to hopefully try and sort it today...

I'm in Shipley north of Bradford.

Cheers James
 
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