can a 2.5 to a 3.5 e36/e39 fit into e46 1.8 and what it may involve

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  1. can a 2.5 to a 3.5 e36/e39 fit into e46 1.8 and what it may involve 
    #1
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    Right ill get started i have a bmw 318 ci coupe it is a little under powered for what i like but instead of getting rid of it i want to up grade it it is currently a 1.9 4 cylinder and looking to put at least a 2.5 6 cylinder in it i will be getting a donor car either a 5 series e39 or a 3 series e36 and as i have a budget of not a lot. i would like to know how hard it is and what it involves on all levels i am a very mechanical person and have worked on cars that even specialist wont touch but as its the first time for an engine change in a bmw i need a bit of advice mainly on wiring and if it will all fit together and what tinkering i may have to do
    Last edited by xXNealXx; 16-03-2012 at 19:35.
     
     

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  3. hi im new need some advice on engine change 
    #2
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    i have posted in the tuning section and heres goes Right ill get started i have a bmw 318 ci coupe it is a little under powered for what i like but instead of getting rid of it i want to up grade it it is currently a 1.9 4 cylinder and looking to put at least a 2.5 6 cylinder in it i will be getting a donor car either a 5 series e39 or a 3 series e36 and as i have a budget of not a lot. i would like to know how hard it is and what it involves on all levels i am a very mechanical person and have worked on cars that even specialist wont touch but as its the first time for an engine change in a bmw i need a bit of advice mainly on wiring and if it will all fit together and what tinkering i may have to do
     
     

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    disco!!!!'s Car Details
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    to be honest id avoid swapping the engine, save your coin and buy a 6 cylinder. Your wallet and body will thank you for it
    no what you want hear but im talking from experience (still on going lol)

    if you are wanting to go ahead with it id avoid the E36 and E39 engines
    both will be a nightmare to wire in and in the case of the 5 series you may have to change the sump, oil pickup, anciliaries etc
    your best bet will be to get a smashed donor E46 (325, 328, 330) and just swap everything over

    have a read of my thread (in my sig) 38 pages of how to go from a 318 to a 328 in the worst possible way
    loud-low-slow-project


    no sugar turkish, im sweet enough
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    If you can buy a tatty 328 saloon, you'll be able to swap everything over, but you'd need to do all of the work yourself.
     
     

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    #5
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    ill be doing all the work i do think that the e46 smashed up donor would be a better idea but im not sure on the saloon as from my experience everything seems to be different. i have only done body parts though. this is why i need the advice from experience lol
     
     

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    Thought i would share this with you

    In 2009 i bought a e36 convertable, this was origanaly a 1.8, the last owner replaced that with a 2lt 6pot and this was very slow, after doing what i did to the car and a year later i decided to replace that engine with a 2.5, i bought 2 e36 coupe's in the end as the first one had a duff engine so we found out later so went looking for another one. This was also a 2.5i coupe with 120k and ran so sweet but the owner had side swipped a lamp post and done lots of damage to the body work so as all i wanted was the engine i offered him £300 cash and loaded it on to the trailer......

    As your machanicly minded that a bonus. If your car is a e36 then its a 325 e36 you need as a doner car. if possable get the whole thing as your going to need, the engine and gear box, ecu, wiring loom etc, if your has the OBD or what ever its called under the head unit then one that equiped the same, if not then its not a problem but you can retro fit that in to your 1.8.

    You may need the prop shaft from the doner car, as i found that the 2.5 gear box sat a little closer to the engine so we stripped the diff in two, the rear was from the car and the front was from the 2.5, it all joins together so no problems, the 1.8 dif has a slightly different ratio as well, so if you keep the rear diff as origanal it means that the car with the 2.5 engine in it and the 2.5 gear box will pull a bit quicker on take of.

    You should be able to remove the engine and gear box in one, just be carfull with wiring etc, i also replaced stuff like the heat sheild, fitted the 2.5 exhaust as well and new gear box mounts and engine mounts.

    As for the 2.5 engine, do the normal checks and see it running is always a bonus.


    Started like this



    And ended up like this






    Other photo's






    Progress picks
    Striping mine , getting ready for the swap


    getting the 2.5 ready and giving it a clean




    OOOOOOOOOOOOOo Look new gear box mounts


    Removing the inlet manifold and auxilaries from the other 2.5






    The engine after a good clean




    Inlet manifold and stuff now removed and ready to go in to mine








    Now this is the project link on the performance bmw forum if you want a look

    Performance BMW Forum // Log in


    And i also have this in my barn, will be advertising it shortly, a S/Steel manifold for a 325/328 but never got round to fitting it


    BMW its an addiction, Its a drug
     
     

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    #7
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    the car looks really nice don't blame you for changing the engine that's a car i would keep . i take it it wasn't done over the weekend lol i think looking at that makes me want to dig right in it will be a winter project this year ready for next summer.
     
     

  9.  
    #8
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    cheers looks like i will need it lol ill get my dad to help he used to be an air craft engineer too may be thats were i get the practical stuff from ill tackle it like my other projects i have done in the past most made up of about 3 different cars in the end but all worked cheers for the advice im sure i will be asking you more questions when i do take it on
     
     

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