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Sidedraught's right, the A10 engine, from which all other A series engines are derived, was designed by some very clever little Datsun engineers. It needed to be cheap to make, a good sound design that could be developed further, & it needed to be tough.
This meant an all new design that was NOT a copy of anyone else's engine.

The finished product was all of these & more.
With it's short 59mm stroke, this ensured a stiff crank. This meant that they could make it with three mains, without sacrificing anything but complexity & cost. These engines are factory red lined at 6,500 rpm in standard trim & they will hang in there with a very high degree of reliability. The short stroke & reduced drag of only three mains ensured that it would rev freely.
The ratio of valve diameter to cylinder volume is better than the 1200 engine too.

The more one stops & thinks about the inherent design features of the A10 engine, the easier it becomes to fully appreciate what a truly wonderful little design it is.

Don't knock the three bearing crank without understanding why it was used.

Also remember that the A15 still uses these same journal diameters & there are a few very hot A15 race engines out there, & none of them suffer from chronic bottom end problems.
I said it was tough.

Oh yeah, some racers finally discovered the limits of that three bearing crank, & I'm told that the bottom end suffers from shortened service life at speeds above 10,000 rpm, but for even a hot street engine, the crank is just fine.

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Yep or you can just grind it down smaller.

Whats the cost of it ?

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Three bearings, less friction = a free revving delight

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LOL.you've got to love the music.

Tough 3 bearing still not a match for a 5 though I think


Oh.....and I got engine mounts off for you
One is starting to seperate at the top slightly
Still willing to send them if you need them though

Hmmmm...

what about these


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I'll keep working on my coilover kit anyway

Found this one the other day:

http://www.sunny-b10.com/

i think we need a b10 dedicated thread

here's a few more links that some folks might not know about :

LINK 1
LINK 2
LINK 3

hmm, are kb10's very rare in japan or do enthusiasts prefer sedans--or both?

Mmm very nice!

Translated 1

Translated 2


EDIT love it - there's pics of this car on this site too...