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Thread: Part list for sidedraft conversion for 320/6

  1. #1
    Join Date
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    Part list for sidedraft conversion for 320/6

    Hi guys,

    I have a Euro-spec 1980 320/6 that I'd like to convert to sidedrafts. Besides the obvious DCOEs that I have lined up, what else do I need?

    I know this will involve parts and linkage stuff, but does anyone have a specific breakdown of what components I will need? Vendors who sell them?

    This is the carb'd 2.0L M20 that has has recently been rebuilt and converted to a Weber 38 DGES bought from Top End Performance.

    Thanks,

    Jeff

  2. #2
    Join Date
    Jun 2016
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    Austin, TX
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    Drool. I love me some triple sidedraft action!

  3. #3
    Join Date
    Apr 2005
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    79 320/6 81320i 65malibu
    HDX is one of the men for webers here, his has always run them since I can remember. Will send him a pm for you.

    I remember he has said most of the late reproduction manifolds are junk because the carbs do not sit flat when installed. They install at an angle which effects the bowl level and some of the inner jetting ports position in the fuel level. Or something like that.

    Always FUN TO DRIVE - Build Thread & Tech info - 79 320/6 track car build thread -- Videos of track car -Adam in car Auto-x video - Start-up video - 4/2011 Adam's TOP BMW time San Diego BMWCCA - 4-5-15 Dyno break-in run new M20B25 - Exhaust Thread - Link

  4. #4
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    75 2002 77 323irace 91M5
    old man your memory is good . Sadly the new manifolds are all built more for fuel injection . The car will run but not the best .

    The issues you have are the brake booster is too close to the back carb , and the distributor is right under or hitting the front carb .

    I have a set of roland manifolds on mine now . They required lots of work to be to be perfect . Removal of the fuel injector bosses ,match port, fly cut to remove 6deg. of angle. The mounting holes for the carbs welded up and re drilled.

    I use a eletromotive xdi for the distributor problem. You can get it to clear with the stock distributor but to work on the distributor you have to remove the front carb .

    A smaller booster off a 77 320 will give you more room for the velocity stacks. A 2002 tii booster is even better .

    Ireland engineering has a new manifold I have not tested it . The story is it will clear the booster in a m20 swapped 2002 and clear the distributor. the angle of the carbs is 10degrees up . 5 degrees to much .

  5. #5
    Join Date
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    Hey guys. Thanks for the responses. Will digest further but right off the bat, the brake booster is up front as this is a right-hand drive car. Also it is not fuel-injected as stated - it is a carb'd 2.0L M20.
    Last edited by K20RI211; 02-12-2018 at 07:49 PM.

  6. #6
    Join Date
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    82' E21 318i, 92 MB-180E
    Can I just say, I have Webers, and screw them when you have options like this from RAMA RHD. Spend a little extra, do EFI and thank yourself.

    http://racehead.com.au/products-page...e30-cf-plenum/

    If you ever decide to build an M20, or swap it out for an 885 B25, you'll be laughing.

    Rama's ITB stuff is hands down the best stuff on the market, period.
    "The most important thing is balance." - KT

  7. #7
    Join Date
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    75 2002 77 323irace 91M5
    The cannon redline manifolds are for the m10 ,and only fit on a m10 .

    You can see how the injector bosses on the Roland manifold from classic auto parts blocks part of the port.and needs to be removed .

    The green 2002 with m20 has a old korman manifold . sadly it is no longer made and very hard to find .

    Franz I have some of rhd parts and they are nice . If I tuned your car with sides you wouldn't be saying that.

  8. #8
    Join Date
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    82' E21 318i, 92 MB-180E
    Quote Originally Posted by hdx View Post
    The cannon redline manifolds are for the m10 ,and only fit on a m10 .

    You can see how the injector bosses on the Roland manifold from classic auto parts blocks part of the port.and needs to be removed .

    The green 2002 with m20 has a old korman manifold . sadly it is no longer made and very hard to find .

    Franz I have some of rhd parts and they are nice . If I tuned your car with sides you wouldn't be saying that.
    Oh I love webers, but the ease of buying a complete kit for THAT money plus an ECU and wiring is ridiculous when you consider the cost of the Webers new plus manifolds (which are unfortunately shit as you say and need work) and pump and all the little bits and pieces, plus jets, venturis, emulsions. Shit all adds up.

    No doubt DCOE's are amazing but dem ITB's with a straighter airpath (no leveled out carbs) pick up heaps of extra midrange power.
    "The most important thing is balance." - KT

  9. #9
    Join Date
    May 2004
    Location
    Walnut Creek, CA
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    71 02, 79 323i,03 330i, 91 325
    So, if you get the RHD kit what else is needed (anyone has a parts list?). I currently have a manifold for triple sidedrafts to go with a new motor I plan on getting.

  10. #10
    Join Date
    Sep 2005
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    Montana/Washington
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    75 2002 77 323irace 91M5
    For a 323i

    E30 m20 engine Wire harness

    E30 m20 60-2 crank trigger and crank angle sensor + mount.

    injectors,

    stand alone CPU like a mega squirt pnp.

    A laptop computer is nice for in car on the fly tuning . MS has a nice auto tune feature.

    Some kind of air box with a air temp sensor.

    Air filter

    Dyno tuning.

    If you want it to run like a mild mannered fuel injected street car and live altitude compensation a maf sensor is needed.


    I have a m5 with a s38 3.6 with factory ITBs . I replaced the factory CPU and maf with a mega squirt pnp.
    It's running in alpha n .

    I had it on the dyno for three days tuning it to get the wot fuel curve and ignition curve perfect.

    Many hours were also spent tuning the warm up enrichment , part throttle cruise . Ac idle up . And acceleration enrichment.

    After all the tuning it gets better fuel economy, passes smog , and puts out the factory rated hp.
    I drive the car on long distance road trips to Montana. When I get to Salt Lake City from Southern California I have to change files to my high altitude file.
    Last edited by hdx; 02-21-2018 at 01:07 PM. Reason: Fuel injection is more complicated and expensive.

  11. #11
    Join Date
    Apr 2018
    Location
    Oklahoma
    Posts
    1
    My Cars
    1978 320i
    Hi guys. I have a 2.5 m20 out of a 88 in my e21. I too am wanting to go carbs. Can anyone provide me the correct distributor part # (or a link to purchase one) to install on the side of the block to eliminate the efi distributor on the front of the head.

    Thanks, matt

  12. #12
    Join Date
    Jul 2011
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    E21, E30, E91
    I can't help but just wanted to update that I have some 40s being rebuilt by Top End and also secured the manifold, linkage and filters. Looking forward to waking the baby M20 up!

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