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1:6 Scale BMC A Series Engine
A working model of a classic power unit.
About this creation

This engine powered two generations of small British cars, including 5 million Minis - the proper ones, that is... It was in production for nearly half a century after appearing as an 803cc unit in the 1952 Austin A30.

This model, with many moving parts and plenty of detail, is of the 1275cc twin-carb unit from a 1960s Mini Cooper S.



A short video of it doing it's thing...



Talk among yourselves while I bore you with the details...

The standard Lego M motor is an excellent 1:6 copy of a Mini's starter, which is handy... It acts on the flywheel's circumference.



The crankshaft runs in five main 'bearings' rather than the two that Lego engines usually get. With a (square!) bore of 2 studs for those big ol' pistons and a stroke of the same the swept volume of each cylinder is square as well.



Camchain and belt drive for the fan and alternator... The extra pair of gears at the top of the chain make sure the camshaft runs at the correct speed.



Camshaft lobes push the pushrods, which push the rockers, which push the valves...



Distributor drive is taken off the camshaft...



Which turns the rotor arm (sort of) inside the distributor cap.



Off with it's head! 4 elastic bands = 8 valve springs, which is nice.



Head correctly torqued down (!) and it's ready to run again. Feel free to spot the starter, alternator, distributor, dipstick, oil pump, coil, twin S.U. carbs etc. Or not.



There's a few things missing in this picture...





Comments

 I like it 
  December 3, 2012
very close to the real thing.
 I like it 
  November 29, 2012
ravishingly beautiful!
 I like it 
  November 22, 2012
whoea! very nice, i love it!
 I like it 
  November 17, 2012
Amazing Nick! Loving this, it looks so accurate, it sounds so real. Another amazingly technical creation from you :-) Our Ferrari is going to be featured in the 2013 LUGnuts Calender!!! Send me your postal address to my Flickr inbox please and you can have a copy :-D
 I like it 
  November 16, 2012
awesome! nice detail!
 I made it 
  November 13, 2012
Quoting Iain Marsh Cool. For added realism though, it must misfire when raining.
Haha! So true... and a bit of smoke wouldn't hurt.
 I like it 
  November 13, 2012
Cool. For added realism though, it must misfire when raining.
 I like it 
  November 12, 2012
Brilliant!! I'm amazed by the accuracy of this build. the video provides some "engine noise" that sounds just like a real one... Waiting for the "what is going to fill the empty space". Best of luck!!
 I made it 
  November 12, 2012
Quoting Lola TruckDriver Hey, if a car is coming, then it _must_ be a Mini Cooper. Guys, you have to drive one to get what I mean; more fun on 4 wheels I ever had.
Yep. It's just not possible to drive one and not smile :-) Cheers, Lola.
 I like it 
  November 11, 2012
Awesome work Nick!
 I like it 
  November 10, 2012
Hey, if a car is coming, then it _must_ be a Mini Cooper. Me waits impatiently for a full-on Monte Carlo replica, complete with that infamous set of lights that got them out of their victory in the '66 rally. And of course, a transverse 4-speed gearbox and that incredible suspension setting of the time. Elastic Rubber balls! Guys, you have to drive one to get what I mean; more fun on 4 wheels I ever had, given my miserable budgets. Cheers Nick and congrats of course. If only I could make out how you are driving the oil pump...
 I made it 
  November 10, 2012
Quoting Parrington Levens you won't rest till you've built an actual drivable car out of lego, hahaha, I can just see you driving out of your house one day in a giant lego car!
Hee hee, one day... although crumple zones might prove difficult :-)
 I like it 
  November 10, 2012
Impressive build
 I like it 
  November 10, 2012
well done!
 I like it 
  November 10, 2012
you won't rest till you've built an actual drivable car out of lego, hahaha, I can just see you driving out of your house one day in a giant lego car!
 I like it 
  November 10, 2012
Excellently detailed motor. Good presentation. Iespecially like the way you did the 8 valves.
 I like it 
  November 10, 2012
Absolutely amazing! I love the fan and everything! I can't put it into words! wow! 100000/5
 I like it 
  November 10, 2012
The details of the push rods and valves is something I haven't seen done with Lego before. This is a pretty cool creation Nick! ~Thoy
 I made it 
  November 10, 2012
Quoting Loek Marcus Nick, your model is where it belongs, on http://thelegocarblog.wordpress.com/2012/11/09/a-team/ :-) Congrats!
That's cool! Thanks Loek. Interesting what they said about the actual engine, which is all true...
  November 10, 2012
Nick, your model is where it belongs, on http://thelegocarblog.wordpress.com/2012/11/09/a-team/ :-) Congrats!
Nick Barrett
 I like it 
Chris Melby
  November 9, 2012
There it is, watching the lights dim and then recover due to an "Intense Technic Event". =D Z
Nick Barrett
 I like it 
White Knight
  November 9, 2012
Most impressive ! Must see it all installed in a vehicle one day !>.....well done Nick
 I like it 
  November 9, 2012
Awesome engine! Love all the details you put into it.
 I like it 
  November 9, 2012
Very cool and I enjoyed your video!:) Great done Nick!
 I like it 
  November 9, 2012
Only the actual engine can beat it, looking forward to see a car built around it.
 I like it 
  November 9, 2012
Excellent
 I like it 
  November 9, 2012
such working things are awesome and yours is really stunning ;-) ! well done!
 I like it 
  November 9, 2012
Whoa, that's awesome!
 I like it 
  November 9, 2012
Crafty build! Not like the old engines back in the 70's, that's for sure!
 I like it 
  November 9, 2012
Oh dear lord what is about to befall us... Nick B. building at ludicrous scale??? With Mog tires??? I can't wait. This engine alone is quite special too, though. What a nice little replica, and will ALL the working gubbins! Proper stuff right here.
 I made it 
  November 9, 2012
Quoting MortalSwordsman . Another masterclass from the master builder. Really Impressive stuff Nick, cant wait to see the end result.
Thanks Joe. I hope you're well, and not too busy...
 I made it 
  November 9, 2012
Quoting Elk Guard Wow! What do you do for a day job?
Nothing to do with engineering, although I went to university with a lot of Mechanical Engineers and learned more about that than my actual subject! Thanks Elk :-)
 I like it 
  November 9, 2012
I always feel this type of work is the true pinnacle of the technic possibilities of Lego. The fact you can drop the engine out of one of your builds and it stands up as a quality build in its own rights is a testament to your skill. Great in every sense.
 I like it 
  November 9, 2012
Another masterclass from the master builder. Really Impressive stuff Nick, cant wait to see the end result.
 I like it 
  November 9, 2012
Thats awsome. Do I sense a 1:6 Mini in your future?
 I like it 
  November 9, 2012
Wow! What do you do for a day job?
 I like it 
  November 9, 2012
Lovely!! Looks so real : ) And works too - can't wait to see it in a Mini! 5 stars
 I like it 
  November 9, 2012
Lovely job. We'll wait patiently for you to fill in the blamks above.
 I like it 
  November 9, 2012
My Mum had one of this series of engines in her A30 van and my Dad had one in his Morris Traveller. The wood work on the Traveller would be interesting to render in Lego :)
 I like it 
  November 9, 2012
Neat engine! I love it :D
 I like it 
  November 9, 2012
excellent nick love all the small details would love to see it in a car (if not already in one)yet agian you never cease to amaze me
 I like it 
  November 9, 2012
I love it! Really would be cool to see it in a big car. ;-)
 I like it 
  November 9, 2012
Fantastic work! The video is incredible. Looking forward to the whole thing!
 I like it 
  November 9, 2012
I swear that last picture wasn't there when I last looked! :O I look forward to seeing the end result :)
 I made it 
  November 9, 2012
Quoting marcel urbanija Sweet engine! Am I the only one who'd like to see this thing in a up to scale lego car? It sure would be a big car! :D
Thanks marcel. I want to see it in a big car too...
 I made it 
  November 9, 2012
Quoting Loek Marcus A really great engin- huh, it really works! What a fantastic bit of machinery! Is there any chance of this being spotted in a huge, functional LEGOŽ car? :-)
There's a clue in the last picture... thanks Loek!
 I like it 
  November 9, 2012
Sweet engine! Am I the only one who'd like to see this thing in a up to scale lego car? It sure would be a big car! :D
 I like it 
  November 9, 2012
Excellent. I love how you made the valves work.
 I like it 
  November 9, 2012
A really great engin- huh, it really works! What a fantastic bit of machinery! Is there any chance of this being spotted in a huge, functional LEGOŽ car? :-)
 I made it 
  November 9, 2012
Quoting Chris Melby There it is, watching the lights dim and then recover due to an "Intense Technic Event". =D Z
Haha! Thanks Z :-)
 I like it 
  November 9, 2012
Very nice Nick! Can't wait to see the car around it! :)
 I like it 
  November 9, 2012
A technical masterpiece! Works exactly like a real engine :)
 I like it 
  November 9, 2012
The only word to describe it: Awesome!
 I like it 
  November 9, 2012
Fascinating! :)
 
By Nick Barrett
Add to my favorite builders

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people like this. See who.

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Added November 9, 2012
 


LEGO models my own creation MOCpages toys shop 1:6 Scale BMC A Series EngineTechnic


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