Omega Owners Forum

sprucey Newbie Offline Posts: 7 fife,scotland Gender: Drives: omega 2.5v6	engines 17. Nov 2009 at 16:51 hi i currently have a saloon 2.5 v6 manual but the bottom end has seized so i got a 3.0 v6 automatic and was wonderin if i can fir the 3.0 with my manual gear box
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tunnie Over Active Poster Offline Posts: 22520 London, W3 Gender: Drives: 2.2 CD (LPG'd) & BMW R1200 GS	Re: engines Reply #1 - 17. Nov 2009 at 16:51 no, it would not handle the torque. You would need a R28 manual box, or AR35 Auto
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sprucey Newbie Offline Posts: 7 fife,scotland Gender: Drives: omega 2.5v6	Re: engines Reply #2 - 17. Nov 2009 at 16:54 any idea how much for manual gear box and where can i can get 1
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tunnie Over Active Poster Offline Posts: 22520 London, W3 Gender: Drives: 2.2 CD (LPG'd) & BMW R1200 GS	Re: engines Reply #3 - 17. Nov 2009 at 16:56 R28 manuals are not common, infact quite rare. xplod cars is a good source, keep an eye on the parts section for one being broken.
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sprucey Newbie Offline Posts: 7 fife,scotland Gender: Drives: omega 2.5v6	Re: engines Reply #4 - 17. Nov 2009 at 16:57 thanks m8 i'll try keep eye out
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Kevin Wood

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Re: engines
Reply #5 - 17. Nov 2009 at 17:01

I would have said it's far less critical with a manual box and you'd probably be OK with the one you have. 3.0 manuals did have the R28 box but if I were in your boots I would see how the R25 goes rather than replace it with an unknown 2nd hand R28.

Now, if it's an automatic gearbox then it's a totally different matter because the clutches are proportioned for a design torque and if it's exceeded the box will die in short order.

Kevin

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Ian_D Omega Baron Offline Posts: 2419 York Gender: Drives: Omega 3.0 Elite, Facelift Omega 2.5 GLS, Sold the TD Elite	Re: engines Reply #6 - 17. Nov 2009 at 17:02 Didnt know that the R25's couldn't handle the torque. I know that the automatic AR25's are a no-no though.
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tunnie Over Active Poster Offline Posts: 22520 London, W3 Gender: Drives: 2.2 CD (LPG'd) & BMW R1200 GS	Re: engines Reply #7 - 17. Nov 2009 at 17:06 i thought the R25 could not handle any more than 190/200bhp?
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Marks DTM Calib Administrator Offline Ex Member Posts: 25671 Northern Hemisphere Gender: Drives: Astra J, Mum Bus, Dexta Tractor, 108 DMU wip	Re: engines Reply #8 - 17. Nov 2009 at 17:24 tunnie wrote on 17. Nov 2009 at 17:06: i thought the R25 could not handle any more than 190/200bhp? Its related to torque not bhp Dont forget you need to add the spiggot bearing to the auto engine (which wont have one)
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tunnie

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Re: engines
Reply #9 - 17. Nov 2009 at 17:31

Marks DTM Calib wrote on 17. Nov 2009 at 17:24:

tunnie wrote on 17. Nov 2009 at 17:06:

i thought the R25 could not handle any more than 190/200bhp?

Its related to torque not bhp

Dont forget you need to add the spiggot bearing to the auto engine (which wont have one)

How much torque can the R25 handle then? I always thought a 3.0 would kill an R25 eventually, but much more slowly than the AR25.

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Kevin Wood

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Re: engines
Reply #10 - 17. Nov 2009 at 17:38

tunnie wrote on 17. Nov 2009 at 17:31:

How much torque can the R25 handle then? I always thought a 3.0 would kill an R25 eventually, but much more slowly than the AR25.

250nm if the same naming convention applies. Which tallies with the 3.2 not having a manual option (290nm torque o/p IIRC).

In a manual gearbox you are only talking about the gears, the shafts they run on and the bearings and bushes that locate them. They'll wear slightly quicker with higher torque but will probably still give a reasonable life expectancy unless abused.

In an autobox, on the other hand, extra torque overcomes the friction in the clutches with every change causing much more rapid wear.

Kevin

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tunnie

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Re: engines
Reply #11 - 17. Nov 2009 at 17:48

Kevin Wood wrote on 17. Nov 2009 at 17:38:

tunnie wrote on 17. Nov 2009 at 17:31:

How much torque can the R25 handle then? I always thought a 3.0 would kill an R25 eventually, but much more slowly than the AR25.

250nm if the same naming convention applies. Which tallies with the 3.2 not having a manual option (290nm torque o/p IIRC).

In a manual gearbox you are only talking about the gears, the shafts they run on and the bearings and bushes that locate them. They'll wear slightly quicker with higher torque but will probably still give a reasonable life expectancy unless abused.

In an autobox, on the other hand, extra torque overcomes the friction in the clutches with every change causing much more rapid wear.

Kevin

I thought the numbering system was the same, but did not dare say Grin

Cheers for the clarfication Kev Thumbs Up!

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