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[Datsun 1200 encyclopedia]

A-series Engine Swaps

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Category: Engine Modifications

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Revision as of 03:50, 15 March 2009
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Line 27: Line 27:
= Left Side Mount Location = = Left Side Mount Location =
-= Engine Mount Changes = 
* Engine mounts moved back about 2" * Engine mounts moved back about 2"
** Engine pan changed to mid-sump (B210 only) ** Engine pan changed to mid-sump (B210 only)
Line 44: Line 43:
The mounts are also about 1" further back. This modified mount shows how far: The mounts are also about 1" further back. This modified mount shows how far:
* [http://datsun1200.com/modules/myalbum/photo.php?lid=14316 http://datsun1200.com/modules/myalbum/photos/thumbs/14316.jpg] * [http://datsun1200.com/modules/myalbum/photo.php?lid=14316 http://datsun1200.com/modules/myalbum/photos/thumbs/14316.jpg]
- 
= Discussions and Details = = Discussions and Details =

Revision as of 03:50, 15 March 2009

Contents

A-series Nissan Engines

The A14 and A15 engines are "tall deck" engines, and are 3/4 inch higher than A12s. However, they fit in the 1200 with only minor changes. This also applies to the 1974 A13 engine. The A14 and A15 are by far the most popular swapping candidates since the bigger displacement of the A14 and A15 means both more power (peak HP) and more low-speed power (torque) than the A12, A13 or A12A. Remember: "There is no replacement for displacement" (aka "theres no substitute for cubic inches").


Swap Factors

These factors are different when swapping:

  • 1967-1973 motor mounts vs 1974-up mounts
  • increased deck height raises exhaust pipe
  • and 3-bolt vs 2-bolt exhaust flange
  • A14 & A15 call for stronger transmission
  • Call for stronger differential than 1967-1974 H145 type


776.jpg A14 GX Engine

4779.jpg A15 Engine deck

4780.jpg A15 Engine (left side)

Like all 1974-up engines. the A14/A15 have the motor mount bosses in a different place compared to the 1971-1973 A12 engines. So the engine mounts are a bit different. This photos illustrates the difference:
1779.jpg
Stock left-side mount in Datsun 1200, but Newer A12 engine. A better way is to move the brackets on the engine, to get the engine lower. You could also 1) use the 1974-up ute crossmember or 2) modify the crossmember.


Left Side Mount Location

  • Engine mounts moved back about 2"
    • Engine pan changed to mid-sump (B210 only)
  • Front rubber mount fitted with roll stopper, to prevent excessive engine roll
  • Rear rubber mount (transmission mount) fitted with roll stopper, which helps prevent engine from moving forward in an accident


Early vs Late Engine crossmembers

  • 12432.jpg


Left side mount comparo

  • 2563.jpg 2564.jpg


The mounts are also about 1" further back. This modified mount shows how far:

  • 14316.jpg

Discussions and Details

The simplest way to fit the motor mounts is a flat plate:

Photo-0283-1.jpg

However, this makes the engine sit about an inch too high. You could slot the bolt holes in the engine bracket so it will slide up an inch to level the engine.


Questions

  • What's Better? A14 or A15?
  • But isn't the A15 stroke to long to rev high?
  • Isn't the rods too short in the A14?

For answers, see: Engine Swaps, section "A-series Nissan Engines"