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Thread: My second car, twin carb 200B.

  1. #1
    Member nebuchernezzer's Avatar
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    Default My second car, twin carb 200B.


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    This is my 1977 Datsun 200B (810 Bluebird). It's one of the first 200Bs and as such it's the rare IRS model (most 200Bs in Oz had borg warner live axles) with an R160 diff. I use it as my second car (I daily both my cars), it's fun in an old school way and fairly torquey now that I've put the twin carbs etc on it.
    This picture is how it sits now, but below is a quick run through my build over the year that I've owned the car.


    I copy pasted this from another forum I post in
    It's a 1977 Datsun 200b (810 Bluebird in Japan), it's a very early model so it has the IRS rear end (most Oz delivered 200Bs had live axles as part of the Australian content thing).
    It's a 2 owner car, for most of it's life it was owned by a WWII veteran, then recently a younger guy bought it. It's still pretty much in it's unmolested original state though. It's got a CD player and some speakers added but it's all been done without cutting anything which is nice.
    It's a 4 speed manual with 135,000km, also it's got it's original NSW plates.
    I want to keep it nice, easy to drive daily that has nothing about it's classicness really ruined.

    I've not done anything inside apart from remove the stereo/sub the previous owner installed, but it should look nicer with a clean as well.




    Then I bought this A87 head, this casting has better combustion chambers than the standard L20B U67 casting with a nice quench area. They are also slightly smaller than the stock U67 at 41cc each.
    I plan to use this better head with twin SU carbs from a 180B SSS. To do this I need to port the head's intake ports out to 1.5" from the 1.25" they are now. I'll also skim the head and rebuild it with the top end rebuild kit I also bought today, fun times!
    The cam is of unknown spec, I've got to check and see which L series motor it came from (it's possibly not an L18 cam, although the head itself is from an L18).



    So pulled it apart to see what I need to do to it.


    First off come the rocker retainer springs, then push the valves down with a screwdriver and wiggle the rockers out.



    Next undo the cam retainer and slide the cam out. I think the cam is an L20B item, not an L18 one like the head. The cam and rockers are supposed to be matched (since they wear together) but on this head they likely aren't matched. Regardless I still numbered everything anyways.




    Then get the valve spring compressor out, compress the springs and remove the collets.


    Slide out the valves, and your done . You can see the valves are pretty carbonned up, even over the valve seats. It'll take some cleaning and then we'll see if we have to regrind the valve seats or weather I can just get away with cleaning it all up and seating the valves by hand and be done with it. Of course the head will be cleaned up at home then skimmed before I put it back together with new valve stem seals and so on later.



    Cleaned up the valves and the head a bit. The valves have some pitting so I may get new ones, we'll see. The exhaust valves are the worst which I think is usual.
    The whole lot was pretty crusty before but the head looks pretty good overall. The main thing is that the head isn't corroded or anything so it's a good base. Still more cleaning to do but I've cleaned up the combustion chambers at least.

    Before.


    After.





    Test fitted my wheels, I brought these back from Japan with me when I moved back last year.
    15x7 -1 and 15x7.5 -7 Longchamp XR4s.
    Got to give all of them a good polish and clean up, and fit some tyres to the rears.

    It should look the bomb (and the wheels should fit nicely) after I lower the car. I plan to just roll the front and rear guards at home, no extra flaring. It's an IRS so the rears should camber in under the guards nicely. I want the rear tyres tucked into the bodywork and the fronts in line with the guards.

    Tyres up front are 195/60R15, which is pretty much the right size, so I'll probably put the same size on the rear to match the fronts (the fronts have a fair bit of life left in them). 195s on a 7.5 won't have uber stretch or anything but they should look quite nice me thinks.





    Then I got my twin carbs.
    They are OEM style SU carbs. I was originally told they were SUs from an MG not the SUs made by Hitachi for Datsun but I now know they are actual Hitachi SUs. I'm also got an OEM airbox which I'm very pleased with. So I'll have old school OEM sports look.

    They have 1.5" throats and the manifold splits into four 1.5" inlets. The A87 head has 1.25" inlet ports (unless you get a genuine SSS head, same casting but 1.5" ports). So I fitted just the inlet manifold and sprayed paint down the throats so I had a pattern for grinding out the inlet ports on my head to match the manifold.

    I'll put a rebuild kit through the carbs and I'll have to set up a manual choke for these carbs in place of the automatic choke the standard 200B carb has. Obviously I'll clean up everything and paint whatever needs a lick of paint as well .



    I ported the head out yesterday with a die grinder. Note that you don't want a super smooth finish in the inlet ports. The roughness will help with fuel atomisation. The inlets were originally 1.25" but are now 1.5" to match the SSS twin carb manifold. I sprayed paint down the runners, die ground the diameters to match then smoothed out the radiuses everywhere. Pleased .
    One done, one not.


    All done

    Down two of the runners.


    I picked up some cheap wing mirrors in the same style as the OEM 200B wing mirrors. They are just cheap ones from Singapore, so they aren't perfect but they'll until I can pick up some better ones.


    Polished some of my wheels today.
    Hand polished most and used a scotchbrite pad on a air dremel to do the spokes.
    One down! Going to replace the rusted nuts/bolts with stainless ones.
    Before and after on the 15x7.5 -7s.

    With the fronts in shot as well .


    I've got new nuts and bolts for all 4 wheels now, I ended up getting zinc plated high tensile, although it's completely unnecessary. Pretty much just cos they didn't have the bolts I wanted in stainless.

    Got my extractors, test fit is all good .
    Now to cut off the EGR pipe thingo and weld the hole up, then paint them and heat wrap them.
    When the time comes I'll be scratch building the exhaust from 2" stainless steel.

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    Member nebuchernezzer's Avatar
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    So that was the first part when I first got the car till i'd owned it for a few months, then after a few more months I started doing some more work on it.

    A brief update of all that I've done since posting last, mostly just pics cos I'm lazy .
    Stripped everything out of the engine bay and sprayed the block.
    Before:

    After:


    I replaced the front springs with second hand low kings and replaced all the front suspension bushes and balljoints at this point as well.

    Then I painted the engine mounts and sump black so the engine looks all nice now.
    Then I pulled the existing U67 head off the car and started transferring over the cam etc into the A87 head. It turns out I had a SSS cam so I used that (bit dialed onto a different dowel on the cam gear to get the most out of it.
    After a bit of stuffing around with cam towers it was all good .
    Covered all the surface rust in the engine bay with rust converter and also cleaned up the block ready for the new head.
    All good!





    Then I painted the engine bay and re-assembled. This is the short story, in between all this i had some troubles due to some of the machining on the head being done wrong and it throwing all the rocker geometry out but I got new valve seats put in and sorted it all and tada!




    Then I refitted all the remaining pieces that I had to do, hooked up the throttle linkage and set the stops (the original parts can be made to work with the SUs), hooked up all the fuel lines, remade the water lines and hooked them up and various other small things.
    After that I set the float levels (something I should have actually done before I put the float bowls together haha) and put some ATF in the dash pots to damp them and started it up.

    It ran quite well, it was loud (since I've only had the exhaust on down to the end of the extractors) and lots of smoke came out (off the freshly painted and heat wrapped exhaust) and the odd bit of coolant leaked out so after a getting it up to operating temperature I tightened up all the lines.

    Next step was to balance the carbies, fit the rest of the exhaust and then do a wheel alignment.
    At this stage the exhaust was 99% done, I got the mounting tabs cut to length and drilled all the mounting holes etc. The exhaust is 2" stainless steel. I bought lengths of stainless and mandrel bends and cut it all to fit etc at home and had dad tig it up for me.
    Also I got some R31 rear struts with heavy duty standard height king springs on them, then cut them down by 1.5 coils each and fitted them out back. Car sits pretty good now, but i'd like to get shorter stroke shocks to get the springs captive .


    I also redid the fuel lines a bit, used some titanium tubing (dad got it from work) to make the lines a bit neater where they split to go to the carbies.

    Washed it quickly.
    And got some photos of the exhaust. The muffler hangs a bit low but i'm pretty happy with how it came out, it sounds good too and not too loud.









    Then I got the wheels ready and put them on and I got hold of some genuine wing mirrors to replace the copy ones I had (which I'm selling now by the way). I also tightend up the adjustment on the stearing box. So this is the car now .

    After all this the car is quite good. Torquey, reliable and it hasn't cost me the earth. I'm not sure where to go with it next, repair the minor amount of rust it has (mainly in the bonnet), respray and a Mk1 golf front lip, or perhaps think about selling it and moving onto another secondary car to play with. I dunno...

  • #3
    Veteran blair's Avatar
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    **faps**

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    Veteran shift_rook's Avatar
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    that's immaculate man, good on you! did you used to have a s12 aswell?

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    Veteran 45KIDS's Avatar
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    tad lower in the front and it would be amazing! soo good as it is though!

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    Member nebuchernezzer's Avatar
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    Yeah, my S12 was my first heavily modified car (I did minor mods to the two cars I had before that). I bought it stock with a blown CA20E and converted everything....I think i built that car....8 years ago? Maybe more now, I forget!
    S13 SR20DET and box
    IRS conversion
    Long nose R200 2 way
    Z31 turbo axles
    MA70 intercooler
    S13 front suspension
    S14 brakes
    etc etc

    Most people remember it for the blue fur interior!

    Good learning experience . That car still exists, it's up in QLD 3 owners on now.

    And of course I have my Silver S13 which I've had for about 5 years now.

    In one of my random moments I'm considering finding a rough as guts AE86 to play with though....

    Glad you all seem to like the 810 though, I'm pretty happy with how it sits. Actually, i'd just put it on the ground in that pic up there after fitting new front tyres (can see the stickers on them still haha) so i think it sits about 10mm lower in real life.

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    Veteran shift_rook's Avatar
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    please do this sorta work to an 86

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    Veteran R&D Mechanical's Avatar
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    sick yes do get an 86
    R&D Mechanical, Seaford SA - please visit www.rdmechanicalshop.com
    Our introduction - Click here

  • #9
    Member nebuchernezzer's Avatar
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    I'd like to.
    Depends on whether I can find a cheap enough donor.
    Idealy a rough car that other people are wary of haha. Basic neat mods and then use that for drifting instead of my Silvia sometimes. Get my skills up a bit more.

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    Senior Member Zach's Avatar
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