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A14 BLOCK WITH A15 INTERNALS?
Home away from home
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2011/11/1 8:53
From Leeton NSW
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Hey guys so i have and a14 block and im wanting to put a15 internals have a basic idea of what i need to do just wondering if anyone has done it and can provide me some feedback? So the plan is to put an a15 crank with forged pistons.. so to fit the a15 crank my a14 block will need to be notched? Will need to use a15 rods and pistons.. what else is needed ? Or should i save the time effort and $$ and just leave it an a14? Cheers

Posted on: 2015/10/8 22:40
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Re: A14 BLOCK WITH A15 INTERNALS?
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From 48 North
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Consider whether it's worth it:

A14: 80 hp
A15: 80 hp

The A15 has the advantage as it makes more power than A14 at low RPMs (it has a broader torque curve).

A15 rods are identical to A14 rods. The pistons are different. The blocks are identical late A14 and A15, but the A15 oil pan is notched. Early A14 blocks can be notched, or the A15 crank throws machined down and heavy metal balancing employed (to avoid having to notch the block).

It is highly recommended to obtain an A15 if you want the increased displacement. It's less expensive -- if you can find a good running A15. Make sure to get the 80 hp version as 67 hp A15s are common, e.g. from Vanette (or in USA from 1981-1982 B310).

Or better yet, keep it all A14 but fit 79mm pistons. This gives more displacement than an A15. Torque and power are similar. The same can be done with an A15 for a total size of 1608 cc.

Forged pistons are not recommended for a street car as they are less efficient and noisier, however they are needed for sustained high-rpm use (9000 RPM) or for super-high boost levels.

Posted on: 2015/10/8 23:18
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Re: A14 BLOCK WITH A15 INTERNALS?
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Parts needed for A14 block with A15 crank:
* A15 crank
* A15 pistons
* A15 oil pan
* A14 H72 or M79 casting - notch block for A15 crank travel
* A14 G34 block (1980-) no mods needed

Posted on: 2015/10/8 23:28
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Re: A14 BLOCK WITH A15 INTERNALS?
No life (a.k.a. DattoMaster)
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From Perth
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Thats what my A15 is
A 14 block with a 15 crank in it
As mentioned... same rods
I still run the 14 sump just with a very minor push to clear the rods
Nothing notched on the block I recall
I'm out to 77mm bore with Mazda pistons and modified rods (bigger pin , lightened, balanced etc)

Posted on: 2015/10/9 11:04
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