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Omega r25-r28 Gearbox


john man
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Hi,

I would say this has been asked numerous times.

Is there any modification to the manta gearbox tunnel to fit the r25 gearbox. Or does the gear level hole need to be modified?

Plan is to fit a c20xe also?

Cheers

John

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It’s a little tighter, but fits. The selector needs a slight mid to get into exact same position, but easy done with basic cutting/welding skills.And fabricate a mounting. From my memory it helps if you can drop engine a little too, think it’s escort mounts.

If hydraulic slave used, needs a spacer inside box, they are about on the net still. 
Pics are my R28 mounted to SAABB234 lump, for mockup, but it’s an XE sump pan (for mk2 escort, but fits), but was mounted in XE at first. 

20200206_191210.jpeg

20200204_134411.jpeg

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On 12/01/2024 at 10:15, ®evo03 said:

V6 Omega? 😎

Jess, does Escort XE sump fit B234, no mods? 

Was R25 used for V6

What's was R28 used in? 

I have two V6s and a Rbox for free, must take a day and investigate. 

V6 can use both R25 and R28 depending on capacity. 
No the sump is not a direct fit mate, it is close enough to use as a starting point. Mine is  a work in progress, but you would need a steel gasket profile for the SAAB bottom, think  they are on eBay still along with the water outlet adapters etc

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Hi @Jessopia74

Would you know what clutch kit combination is needed?

Can I stick with the c20xe or do I need to get a omega disk with the c20xe pressure plate.

Also the spacer needed for the slave cylinder do you know the size?

This is my clutch on the engine, I presume this is a flat type, I hear people talk about.

 

20240113_205348.jpg

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Hi @Jessopia74 / @®evo03

Thanks for the info.

@Jessopia74 when you say early type clutch, would it be somthing like this, an early type clutch kit for a C20Xe.
I pressume these flat flywheels came in the early C20XE.
https://www.aemotorsport.co.uk/shop/luk-3pc-clutch-kit-for-vauxhall-calibra-cavalier-c20xe-early-flat-type-flywheel/

 

 

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imo the best box to use nowadays is the 5 speed bmw zf box given that omega boxes are getting harder to come by, one from a 330d is super strong and also fir into the tunnel without mods

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1 hour ago, gt4_ade said:

imo the best box to use nowadays is the 5 speed bmw zf box given that omega boxes are getting harder to come by, one from a 330d is super strong and also fir into the tunnel without mods

Any other mods needed? Slips on ? 

Front part of prop, is that it ? 

Are they cable or hydraulic? 

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1 hour ago, ®evo03 said:

Any other mods needed? Slips on ? 

Front part of prop, is that it ? 

Are they cable or hydraulic? 

they bolt straight up to an xe bell housing using an adapter plate, front prop flange is the same as the omega i.e. 3 bolt. external hyd clutch slave. only bit thats a faff is the clutch as its duel mass however the xe  and bmw flywheel bolt pattern is very similar so with some slugs made to offset the bmw holes the flywheel should also fit

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7 hours ago, Jessopia74 said:

Good genuine R28 box that ‘HP’ code , nice and strong 💪

hp box is the r30

omega box on the left 330d zf box on the right for anyone who is interested, input shaft on the bmw box makes the omega one look like a toy

IMG20220729141724.jpg

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