10 replies to this topic

[Austin mini 30]

Hi Everyone,

 

I have the chance of a 1275 engine to swap with my 998 - I have seen it running and have driven the car it came out of so I know it's a good engine. 

 

I have a few questions regarding transferring parts between the engines though as I would receive the 1275 without a gearbox/flywheel/clutch setup/flywheel housing etc and my 998 has some good bits on it that could be used.  

 

Does my 998 gearbox fit the 1275?

Does my flywheel housing from the 998 fit the 1275?

Does my flywheel & clutch setup etc from the 998 fit the 1275?

 

Any other information about using parts from 998s on 1275s would be great. 

 

Any help is much appreciated as always.

Cheers 

[cal844]

Your flywheel, clutch and wok will fit the 1275, you can even use the carb too

[Swift_General]

You will need 1275 drop gears. The primary gear is different to that on the 998. Top hose, radiator bracket and distributor will also different (if the 1275 doesn't come with them).

Edited by Swift_General, 13 May 2018 - 03:24 PM.

[ukcooper]

top engine steady is longer on a 1275 than 998 so you need 1275 one , bulkhead to engine..

About 1/2" as they moved the 1275 engine towards the front to get it fit ..they adjusted the mounts thinking now ya need 1275 engine mounts ???

Edited by ukcooper, 13 May 2018 - 06:03 PM.

[Swift_General]

top engine steady is longer on a 1275 than 998 so you need 1275 one , bulkhead to engine..

About 1/2" as they moved the 1275 engine towards the front to get it fit ..they adjusted the mounts thinking now ya need 1275 engine mounts ???

I believe this was only for the later 1275 injection models to make space for the injection setup. If 1275 carb, steady is the same.

[Boycie]

All 1275 engines from 1990 onwards (ie Rover Cooper) were 1/2" further forward.  That's why the subframes had the kink in the front (traditionally an automatic thing) to allow a little extra space.  I think it was initially because the HIF44 carb was too close to the bulkhead.  When the SPi arrived, they still needed the extra space.

The extended upper steady is actually the same as the 998cc automatic one.  Bottom steady is shorter...

The gear change rods were also extended at the same time!

[cal844]

top engine steady is longer on a 1275 than 998 so you need 1275 one , bulkhead to engine..

About 1/2" as they moved the 1275 engine towards the front to get it fit ..they adjusted the mounts thinking now ya need 1275 engine mounts ???

the 1990 onwards subframes are drilled half inch further forward, so the complete engine and box is forward in the frame.

[Spider]

There's some good info the other guys have posted here.

 

I'll just add though that while the Carb from your 998 can be used it will need a different Needle and Spring to suit the 1275 engine. Also, while the distributor will physically fit, it's characteristics are totally different between these two engines.

[imack]

I guess your 998 transfer case doesn't have a breather on it, sou you'll have to drill and tap the 998 one for the 1275 breather or rig one up elsewhere.

[Globule]

Can anyone please clarify the difference on the 998 and 1275 transfer housing regarding the primary gear, i.e. what diameter is it on a 1275 and 998? I have a seized 998 and am building up a 1293 so am considering using it as a donor for the housing, but what do I need to make it work? I am fitting straight cut drops which I already have.

I do have another transfer housing but not sure if this is 998 or 1275 and would rather have a measurable value to check against rather than just seeing if it has a breather or not! Thanks 

Edited by Globule, 06 July 2020 - 11:06 PM.

[nicklouse]

Can anyone please clarify the difference on the 998 and 1275 transfer housing regarding the primary gear, i.e. what diameter is it on a 1275 and 998? I have a seized 998 and am building up a 1293 so am considering using it as a donor for the housing, but what do I need to make it work? I am fitting straight cut drops which I already have.

 do have another transfer housing but not sure if this is 998 or 1275 and would rather have a measurable value to check against rather than just seeing if it has a breather or not! Thanks 

has nothing to do with the engine but has everything to do with the gearbox. (other than the 1275 had the breather port open). the idler gear bearings need to be suitable. early cars had smaller bearings. both on the remote hosing and some of the Rod type. All latter Rod type had the larger bearings. both A and A+ on rod type boxes could have either size bearings. 

 

so your current one will be fine to use on your current casing.