I was referring to an A14. The A14 block is different from A15.

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by Fandatstick on 2008/4/1 20:55:47

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ddgonzal wrote:
I doubt if it can take an A15 crank, as the A15 block if different on the sides from A14 block.

A14 blocks can take A15 crank (and rods) to become essentially become an A15 (with block that says A14).

I think DD is referring to an A13 block not an A14.

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A14 blocks can take A15 crank (and rods) to become essentially become an A15 (with block that says A14).

Those clever little Datsun engineers came up with some increible little A series packages & the A14 stroker crank combo is probably the one that got away due to the need to create a long lasting design. The piston side loadings & rod angles were probably more than they wanted to use in a production engine.

As I said, this is probably the practical limit for the short deck block, & even then, is best suited to competition or enthusiast use.

Yes, i missed that typo. Bit more than just a missing letter, so i've edited it to say what i meant.While the A15 crank would fit in the block, the extra stroke would mean the gudgeon(?) pin would probably be above the block deck height. This would mean a heap of expense in getting shorter conrods, etc, meaning more expense.

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The A12A does not use a taller block. It is, to all intents & purposes, a 1974 or later A12 block, but with a 75mm bore.
The late [B310] A13 is exactly the same thing but with a 76mm bore.

I think that Paul might have left out a letter in a word that changes things.
{quote}A15 crank can [can't?] be used [in an A12 block] due to piston pin heights.{unquote}
Geting an A15 crank into a short deck block & making it work would be a serious piece of work & I believe would be crossing that line of diminishing returns. I personally believe that the A14 stroker conversion is probably the practical limit in the shorter blocks.

Without ever seeing one, I still suspect that a yall deck 1974 [B210] A13 might swing the A15 crank as it seems to have been the sump that was modified for the longer stroke in the A15. Can't say for sure about anything else.

At the moment, 1200 rally cars can only use the standard A12 block, but they can be bored & stroked. Most 1200's have the A14 crank as i dont know if an A15 crank can be used due to piston pin heights. the B310/210's can use A15 as that engine is homologated. If you could source a taller A12A block, then i feel that they'd be able to use A15 cranks. It all comes down to Homologations & what the regulations are based on.

Just this month, a guy was giving one away, there were no takers.

Whether it can take a 76mm overbore, I don't know. Why not just use an A14 block?

I doubt if it can take an A15 crank, as the A15 block if different on the sides from A14 block.

A12 blocks can take A14 crank, so might as well start with that.

is the a13 tall block easy to find in USA?

is this block capable of a14 bore size, and then i guess a15 stroke to achieve basically an a15 (therefore being a legal a15 for rally here in aus)

Yes, 1974 A13 is a tall block (like A14)

1971-1973 A12 is one block, with old style mounts

1974-up A12, A13, A12A all use the same block, nearly identical to early A12 except has the new style mounts.