|
|
[< Previous 460 461 462 463 464 465 466 Next >] 
A12A engine ID stamp
 ddgonzal  2015/5/12 22:29  Tell a friend
 5296  6  0.00 (0 votes)
Different from the A12.
A12A was used in Japan in B310 Coupe and Sedan, and in a few north american B310 (Datsun 210) 1979-1982. |
|
|
[< Previous 460 461 462 463 464 465 466 Next >]
The comments are owned by the poster. We aren't responsible for their content.
| Poster |
Thread |
| mikko1200 |
Posted: 2008/3/31 10:17 Updated: 2008/3/31 10:17 |
Just can't stay away   Joined: 2001/2/28 From: Finland Posts: 78 |
 Re: A12A engine ID stamp I have one these engines too. It
|
|
|
| Poster |
Thread |
| Dodgeman |
Posted: 2008/3/31 8:25 Updated: 2008/3/31 8:25 |
No life (a.k.a. DattoMaster)   Joined: 2003/6/27 From: Southern Tablelands N.S.W. Australia Posts: 8287 |
Re: A12A engine ID stamp The A12A is simply one of the versions of short stroke A series engines that is based on the 1974 & later design. [Back distributor]
They use the same basic block as the A12, but with a unique 75mm bore size.
All other A series engines use either a 73mm bore or a 76mm one.
With 1237cc it was too big for 1200 & too small for 1300 & the A12 & A13 designations were already in use anyway, so they just called it A12A
The 73mm piston was the only one to use the smaller 17.5mm wrist pin while these & all engines with 76mm bores used the 19mm pin. This means that these use what amounts to an A12 rod that will mount a 76mm piston from the A14.
Since there are three standard oversizes for each engine, the standards for the A12A will include 76mm & 76.5mm, which happen to be A14 standard & first oversizes.
The piston deck height for both the short stroke engines & the A14 is the same, so by boring the A12A to second oversize of 76mm, you are duplicating the short stroke A13 & by using the largest A14 oversize of 77.5mm you take a short stroke engine out to 1321cc
Since the block was designed for the 75mm bore in the first place [we presume] then the 77.5mm bore size should not worry it at all. [we hope]
I have a short stroke A13 engine which is basically the same, but with a 76mm bore for 1270cc [There was also a long stroke A13, US only, 1974 only, it was basically an A14 but with the smaller 73mm bore size]
So to answer your question, are they any better? It depends on what you want to do. If you want a big bore short stroke reving engine, then these come with the right rods & are already 2mm bigger in the bore than an A12, but are a US-only model [I believe] so finding one here will be hard.
|
|
|
|
| Poster |
Thread |
| ddgonzal |
Posted: 2008/3/31 9:03 Updated: 2008/3/31 9:03 |
Moderator   Joined: 2001/5/3 From: Kent, WA Posts: 31762 |
Re: A12A engine ID stamp To sum it up: YES, the A12A block has the advantage of larger bore.
* Stockers breathe better, have more HP and torque (just a tiny bit) than A12S. Every bit helps!
* Can be bored out as large as A14, larger for sure than A12 engines
* Make great "sleeper", lighter weight 1400cc engines.
Japan-market Cherry came with A12A, iirc. SE Asia markets too.
|
|
|
|
|
| Poster |
Thread |
| Pendles |
Posted: 2008/3/31 9:54 Updated: 2008/3/31 9:54 |
Moderator  Joined: 2004/6/17 From: Toowoomba, Qld Posts: 319 |
Re: A12A engine ID stamp thanks for the info guys, I aquired one the other day, not sure what to do with it yet....
|
|
|
|
|
| Poster |
Thread |
| Dodgeman |
Posted: 2008/3/31 10:18 Updated: 2008/3/31 10:18 |
No life (a.k.a. DattoMaster) Joined: 2003/6/27 From: Southern Tablelands N.S.W. Australia Posts: 8287 |
Re: A12A engine ID stamp If you bore it to 77mm, use an A14 crank [small mod req.] & A15 pistons [small mod req, second oversize is 77mm] you can come up with 1434cc in the short deck block. The upside is that the A15 pistons will fit the rods, something that wont happen with a stock A12 rod.
It's an engine that has a lot of potential, but is not a screamer in stock trim
|
|
|
|
| Poster |
Thread |
| Dodgeman |
Posted: 2005/7/2 9:21 Updated: 2005/7/2 9:21 |
No life (a.k.a. DattoMaster) Joined: 2003/6/27 From: Southern Tablelands N.S.W. Australia Posts: 8287 |
Re: A12A engine ID stamp Well, that clarifies it for me. I had been writing this model as A12a, but now i can see a real one, i'll get it right.
These engines are just the right ones to use as donors when you need con rods for your big bore [76mm & larger] 1200 or A12 block. Use them on the stock crank with A14 pistons, or if going for a stroker, on A14 cranks with A15 pistons.
The standard bore on these engines is 75mm, so these would be ideal to bore & stroke.
|
|
|
|
| Poster |
Thread |
| dattoman_1000 |
Posted: 2005/7/2 10:52 Updated: 2005/7/2 10:52 |
No life (a.k.a. DattoMaster)  Joined: 2002/8/11 From: Perth Posts: 2692 |
Re: A12A engine ID stamp I have one of these in my orange coupe
Origins unknown as it was in the car when I bought it 14 years ago
I guess they must have used them in something we got here.... or something popular in Japan
|
|
|
|
|
| Poster |
Thread |
| Dodgeman |
Posted: 2005/7/2 14:38 Updated: 2005/7/2 14:38 |
No life (a.k.a. DattoMaster) Joined: 2003/6/27 From: Southern Tablelands N.S.W. Australia Posts: 8287 |
Re: A12A engine ID stamp Back in the early 80's there were places that imported container loads of Japanese body panels & mechanical parts, including A series Datsun engines. This is why so many Sunny badges have turned up on second hand grilles & guards. Hell, i still have a few of them, including a 1200 'GX 5 speed' badge
The suppliers of these parts just filled containers with stuff, i'm sure they were selling it by the ton instead of piece by piece, so this is probably where the A12A in your car came from.
|
|
|
|
|
| Poster |
Thread |
| Pendles |
Posted: 2008/3/31 7:54 Updated: 2008/3/31 7:54 |
Moderator Joined: 2004/6/17 From: Toowoomba, Qld Posts: 319 |
Re: A12A engine ID stamp sorry to resurrect an old thread, but are there any advantages of using an A12A over a A12? Are they a better motor in any way?
Or just a later version of the same thing?
|
|
|
|
|
Mechanical
Engine