Bmw advise required?

problems that may arise fitting 20i six cylinder for 18i four cyliner

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Ignore sarge927. He's talking cr@p

Yes, you'll need to redo the engine mounts.

You'll also need to install a new wiring loom.

You may need to change the front suspension as the new 6-pot will be heavier than the 4-pot.

You'd need to check as to whether the gearbox is suitable. They don't always match up, so you may need a new box as well. If you do then you may also need a new drive shaft to the rear diff.

What about the radiator? It may need to be moved, or replaced with one from a 6-pot car.

Overall its a pretty big job, but not impossible. Many have done it and succeeded.

BUT - Why replace a 1.8 with a 2 litre? The gains will be marginal for the amount of work required. If you're going to swap out the engine, then at least put in something worth while, like a 2.8, or 3 litre 6-pot. Even go for a 4.4 V8 if you can find one.

Now that WOULD be worth it!

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Bad idea. Not meant to be.
Don't bother unless your going to go the whole way and fit 2.5 or a midfield 2.7 engine, the cars are cheap, and it's easier just to buy a 320i if you want a 2.0 litre, remember as well as the engine you have to think about uprating gearbox, diff , suspension and brakes. oh and don't forget about about telling your insurance company.
If you're an engineer this is a worthy challenge. I've seen a VR6 Golf engine mated to a Lupo...yes that tiny thing. Best check Performance BMW magazine where you'll find clubs %26 specialists that do this for a living. If thats what you wants thats what you'll get...at a price!
Insufficient space....
Ive seen 6 cylinders swapped into the 318i four cylinder cars. It works really well because of the light weight of the 318i. It is alot of work however. You will have to fabricate engine mounts, mate up a transmission that fits, and find a wiring harness that is close. It is easier on older cars because of the OBD 1. What year is the car? What year is the engine?
The proper spelling is, advice!

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