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{{ImportedFrom|site=Xenonzcar|title=S30 Engine Specs|url=http://www.xenonzcar.com/s30/engines.html|archive=https://dev.z31library.com/xenonzcar_archive/s30/engines.html|fetched=2026-05-15}}
{{ImportedFrom|site=Xenonzcar|title=S30 Engine Specs|url=https://z31library.com/xenonzcar_archive/s30/engines.html|archive=https://z31library.com/xenonzcar_archive/s30/engines.html|fetched=2026-05-15}}


== S30 Engine Specs ==
== S30 Engine Specs ==
Line 6: Line 6:


== Block Identification ==
== Block Identification ==
{| class="wikitable"
|-
|  https://z31library.com/xenonzcar_archive/s30/images/Engine/Location-Blockcode.png
|}


The way to identify the block is to look on the driver side of the engine, to the right of the motor mount is where the block number is cast. The chart below will also help you in idnetifying your Block.
The way to identify the block is to look on the driver side of the engine, to the right of the motor mount is where the block number is cast. The chart below will also help you in idnetifying your Block.


|
{| class="wikitable"
|
|-
|
|   https://z31library.com/xenonzcar_archive/s30/images/Engine/Engine-Code-Close.png
|
|}
|
 
|
{| class="wikitable"
|
|-
|
| '''Engine and years'''
|
| '''Displacement'''
|
| '''Casting Code'''
|
| '''Bore'''
?
| '''Notes'''
|
|-
|
|  L24 (1970) 240Z
|
|  2393cc
|
|  E31
|
|  83.0mm
|
| ?
?
|-
|
| L24 (1971-1973) 240Z
|
| 2393cc
|
| P30
|
| 83.0mm
|
| ?
|
|-
Used the 79.0mm stroke crank
| L26 (1974) 260Z
|
| 2565cc
L28 (1975-1980) 280Z 280Zx
| P30
|
| 83.0mm
|
| Used the 79.0mm stroke crank
|
|-
|
|  L28 (1975-1980) 280Z 280Zx
First EFI L-series in the US
| 2753cc
|
| N42
|
| 86.0mm
|
| First EFI L-series in the US
|
|-
|
| L28 (1981-1983) 280ZX
|
| 2753cc
Cast webbing for more rigidity
| F54
|
| 86.0mm
| Cylinders are "siamesed" Cast webbing for more rigidity
|}


== Head Identification ==
== Head Identification ==
Line 57: Line 64:
To Identify these heads you can look at the head number that is casted into it between the 1st and 2nd spark plug holes.
To Identify these heads you can look at the head number that is casted into it between the 1st and 2nd spark plug holes.


|
{| class="wikitable"
'''Years and Models'''
|-
|
|  https://z31library.com/xenonzcar_archive/s30/images/Engine/HeadCode.png
'''Casting?'''
|}
|
 
'''Compression Ratio'''
{| class="wikitable"
|
|-
'''Chamber CC'''
|  '''Years and Models'''
|
| '''Casting?'''
'''Notes'''
| '''Compression Ratio'''
|
| '''Chamber CC'''
|
| '''Notes'''
1970 240Z E31 Block
|-
|
| 1970 240Z E31 Block
E31
| E31
|
| 9.13:1
9.13:1
| 42.4cc
|
| Uncommon, desirable head that came on many 1970 240's. It's chambers were high-quench designs, however the valves were smaller than the 260 and 280? heads.
42.4cc
|-
|
| 1971-1973 240Z and 1974 260Z P30 Block
Uncommon, desirable head that came on many 1970 240's. It's chambers were high-quench designs, however the valves were smaller than the 260 and 280? heads.
| E88
|
| 8.76:1 240Z ? 8.26:1 260Z Dished pistons ? 9.24:1 260Z flat top pistons
|
| 44.7cc
1971-1973 240Z and 1974 260Z P30 Block
| 2 versions were available, a small valve on the 240Z and larger valve on the 260Z.?
|
|-
E88
| 1975-1976 280Z N42 Block
|
| N42
8.76:1 240Z
| 8.29:1
?
| 44.6cc
8.26:1 260Z Dished pistons
| The larger valve N42 came on the 1975-76 280Z. 48 state U.S. 280Zs didn't use a catalytic converter until 1977, so the head came with softer brass valve seats for use with leaded gas. Many people like these for performance because of it's square exhaust ports. And as a easy mod, putting it on a flattop L28 motor puts compression in the mid 10's.
?
|-
9.24:1 260Z flat top pistons
| 1978-1980 280Z Zx N42 Block
|
| N47
44.7cc
| 8.29:1
|
| 44.6cc
2 versions were available, a small valve on the 240Z and larger valve on the 260Z.?
| Has diamond-shaped exhaust ports with emission liners, which some feel reduce flow. Starting in 1977 Nissan heads came with steel seats for use with unleaded gas. Like the N42, putting it on a flattop L28 motor puts compression in the mid 10's.
|
|-
|
| 1981-1983 280zx Non turbo F54 Block
1975-1976 280Z N42 Block
| P79
|
| 8.82:1
N42
| 53.6cc
|
| Came on 81-83 flattop piston L28 (F54) blocks. It has a 53cc chamber and must be used with flattop pistons or compression drops to 7.8:1 (with dished pistons). The exhaust ports/liners are identical to the N47, and used an internally oiled cam.
8.29:1
|-
|
| 1981-early 1983 280Zx Turbo F54 Block
44.6cc
| P90
|
| 7.38:1
The larger valve N42 came on the 1975-76 280Z. 48 state U.S. 280Zs didn't use a catalytic converter until 1977, so the head came with softer brass valve seats for use with leaded gas. Many people like these for performance because of it's square exhaust ports. And as a easy mod, putting it on a flattop L28 motor puts compression in the mid 10's.
| 53.6cc
|
| It has the same combustion chambers as the P79, but has square exhaust ports like the N42. The P90 and P90a are said to be the best flowing heads due to their turbo origins. They both use an internally oiled cam.
|
|-
1978-1980 280Z Zx N42 Block
| Late 1983 280Zx Turbo F54 Block
|
| P90a
N47
| 7.38:1
|
| 53.6cc
8.29:1
| Hydraulic lifter head, but many of the heads were in fact equipped with solid lifters. Usually these heads were models created earlier in the production year.
|
|}
44.6cc
|
Has diamond-shaped exhaust ports with emission liners, which some feel reduce flow. Starting in 1977 Nissan heads came with steel seats for use with unleaded gas. Like the N42, putting it on a flattop L28 motor puts compression in the mid 10's.
|
|
1981-1983 280zx Non turbo F54 Block
|
P79
|
8.82:1
|
53.6cc
|
Came on 81-83 flattop piston L28 (F54) blocks. It has a 53cc chamber and must be used with flattop pistons or compression drops to 7.8:1 (with dished pistons). The exhaust ports/liners are identical to the N47, and used an internally oiled cam.
|
|
1981-early 1983 280Zx Turbo F54 Block
|
P90
|
7.38:1
|
53.6cc
|
It has the same combustion chambers as the P79, but has square exhaust ports like the N42. The P90 and P90a are said to be the best flowing heads due to their turbo origins. They both use an internally oiled cam.
|
|
Late 1983 280Zx Turbo F54 Block
|
P90a
|
7.38:1
|
53.6cc
|
Hydraulic lifter head, but many of the heads were in fact equipped with solid lifters. Usually these heads were models created earlier in the production year.
|


== Piston Differences ==
== Piston Differences ==
Line 155: Line 125:


The main difference between pistons in the L series is weather or not they are flat top or dished. The Following chart will show you what pistons came in what car and block.
The main difference between pistons in the L series is weather or not they are flat top or dished. The Following chart will show you what pistons came in what car and block.
|
 
'''Model'''
{| class="wikitable"
|
|-
'''Bore'''
|  '''Model'''
|
| '''Bore'''
'''Wrist Pin Height'''
| '''Wrist Pin Height'''
|
| '''Pin Diameter'''
'''Pin Diameter'''
| '''Dish/Dome'''
|
|-
'''Dish/Dome'''
| L24 E31 and P30 Block 1970-1973
|
| 83mm
|
| 38.1mm
L24 E31 and P30 Block 1970-1973
| 21mm
|
| 0 Flat top
83mm
|-
|
| L26 Early P30 Block 1974
38.1mm
| 83mm
|
| 38.1mm
21mm
| 21mm
|
| 0 Flat top
0 Flat top
|-
|
| L26 Late P30 Block 1974
|
| 83mm
L26 Early P30 Block 1974
| 38.1mm
|
| 21mm
83mm
| -7.01cc Dish
|
|-
38.1mm
| L28 Early? N42 Block 1975-1980
|
| 86mm
21mm
| 38.1mm
|
| 21mm
0 Flat top
| -10.9cc Dish
|
|-
|
| L28 Late Non Turbo F54 Block 1981-1983
L26 Late P30 Block 1974
| 86mm
|
| 38.1mm
83mm
| 21mm
|
| 0 Flat top
38.1mm
|-
|
| L28 Late Turbo F54 Block 1981-1983
21mm
| 86mm
|
| 38.1mm
-7.01cc Dish
| 21mm
|
| -10.9cc Dish
|
|}
L28 Early? N42 Block 1975-1980
|
86mm
|
38.1mm
|
21mm
|
-10.9cc Dish
|
|
L28 Late Non Turbo F54 Block 1981-1983
|
86mm
|
38.1mm
|
21mm
|
0 Flat top
|
|
L28 Late Turbo F54 Block 1981-1983
|
86mm
|
38.1mm
|
21mm
|
-10.9cc Dish
|


[[Category:Imported from Xenonzcar]]
[[Category:Imported from Xenonzcar]]

Latest revision as of 22:49, 20 October 2026

Imported page. This page was converted from an archived copy of "S30 Engine Specs" (Xenonzcar, fetched 2026-05-15). The conversion was mechanical, so tables, links and formatting may contain conversion artefacts. Compare against the archived copy if something looks wrong. The content belongs to its original authors.

S30 Engine Specs[edit]

During the 8 year run of the S30 chassis there were a few major engine changes made. First is the size change from 2393cc to 2565cc in 1974 and then in the US market the engine changed again to 2753cc. Here we will talk about the Block, Cylinder head, Crank and piston differences.

Block Identification[edit]

Location-Blockcode.png

The way to identify the block is to look on the driver side of the engine, to the right of the motor mount is where the block number is cast. The chart below will also help you in idnetifying your Block.

Engine-Code-Close.png
Engine and years Displacement Casting Code Bore Notes
L24 (1970) 240Z 2393cc E31 83.0mm ?
L24 (1971-1973) 240Z 2393cc P30 83.0mm ?
L26 (1974) 260Z 2565cc P30 83.0mm Used the 79.0mm stroke crank
L28 (1975-1980) 280Z 280Zx 2753cc N42 86.0mm First EFI L-series in the US
L28 (1981-1983) 280ZX 2753cc F54 86.0mm Cylinders are "siamesed" Cast webbing for more rigidity

Head Identification[edit]

The L-series had six different heads used on the different blocks. Here we will be charting the differences between the heads and how to identify them.

To Identify these heads you can look at the head number that is casted into it between the 1st and 2nd spark plug holes.

HeadCode.png
Years and Models Casting? Compression Ratio Chamber CC Notes
1970 240Z E31 Block E31 9.13:1 42.4cc Uncommon, desirable head that came on many 1970 240's. It's chambers were high-quench designs, however the valves were smaller than the 260 and 280? heads.
1971-1973 240Z and 1974 260Z P30 Block E88 8.76:1 240Z ? 8.26:1 260Z Dished pistons ? 9.24:1 260Z flat top pistons 44.7cc 2 versions were available, a small valve on the 240Z and larger valve on the 260Z.?
1975-1976 280Z N42 Block N42 8.29:1 44.6cc The larger valve N42 came on the 1975-76 280Z. 48 state U.S. 280Zs didn't use a catalytic converter until 1977, so the head came with softer brass valve seats for use with leaded gas. Many people like these for performance because of it's square exhaust ports. And as a easy mod, putting it on a flattop L28 motor puts compression in the mid 10's.
1978-1980 280Z Zx N42 Block N47 8.29:1 44.6cc Has diamond-shaped exhaust ports with emission liners, which some feel reduce flow. Starting in 1977 Nissan heads came with steel seats for use with unleaded gas. Like the N42, putting it on a flattop L28 motor puts compression in the mid 10's.
1981-1983 280zx Non turbo F54 Block P79 8.82:1 53.6cc Came on 81-83 flattop piston L28 (F54) blocks. It has a 53cc chamber and must be used with flattop pistons or compression drops to 7.8:1 (with dished pistons). The exhaust ports/liners are identical to the N47, and used an internally oiled cam.
1981-early 1983 280Zx Turbo F54 Block P90 7.38:1 53.6cc It has the same combustion chambers as the P79, but has square exhaust ports like the N42. The P90 and P90a are said to be the best flowing heads due to their turbo origins. They both use an internally oiled cam.
Late 1983 280Zx Turbo F54 Block P90a 7.38:1 53.6cc Hydraulic lifter head, but many of the heads were in fact equipped with solid lifters. Usually these heads were models created earlier in the production year.

Piston Differences[edit]

Like the heads and blocks there were many different pistons used in the L Series engines. All pistons were cast Aluminum with 2 compression rings and one oil ring.

The main difference between pistons in the L series is weather or not they are flat top or dished. The Following chart will show you what pistons came in what car and block.

Model Bore Wrist Pin Height Pin Diameter Dish/Dome
L24 E31 and P30 Block 1970-1973 83mm 38.1mm 21mm 0 Flat top
L26 Early P30 Block 1974 83mm 38.1mm 21mm 0 Flat top
L26 Late P30 Block 1974 83mm 38.1mm 21mm -7.01cc Dish
L28 Early? N42 Block 1975-1980 86mm 38.1mm 21mm -10.9cc Dish
L28 Late Non Turbo F54 Block 1981-1983 86mm 38.1mm 21mm 0 Flat top
L28 Late Turbo F54 Block 1981-1983 86mm 38.1mm 21mm -10.9cc Dish
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