L28 Bore & Stroke Combinations
presented by Jim Wolf (of Jim Wolf Technology, Inc.)at a Z Club
of San Diego Meeting.
BORE AND STROKE COMBINATIONS FOR L28 ENGINES
| HEAD # |
VOL. C.C. |
INT VALV. |
EX VALV. |
EXH. PORT |
PROD. DATE |
| E31 |
42.4 |
42 |
33 |
square ex |
10/69-7/71 |
| E88 |
44.7 |
42 |
33 |
square ex |
9/71-7/72 |
| N33 |
47.8 |
42 |
33 |
square ex |
8/72-7/73 |
| N33/P50 |
47.8 |
42 |
35 |
square ex |
8/73-8/74 |
| N42 |
44.6 |
44 |
35 |
square ex |
9/74-7/77 |
| N47 |
44.6 |
44 |
35 |
round ex |
8/77-3/78 |
| P81 |
44.6 |
44 |
35 |
round ex |
2/79-6/80 |
| P79 |
53.6 |
44 |
35 |
round ex |
7/80- |
| P90 |
53.6 |
44 |
35 |
square ex |
12/80-7/82Turbo |
| P99 |
53.6 |
44 |
35 |
square ex |
8/82-Turbo Hyd |
| H/GASKET |
HEIGHT |
DIA. |
C.C. |
PART # |
| L28 STD |
1.25 |
88 |
7.60 |
11044-P7911 |
| HKS METAL |
1 |
91 |
6.50 |
11044-91MM1 |
| HKS METAL |
2 |
91 |
13.01 |
11044-91MM2 |
| PISTON |
DIA MM. |
PIN HEIGHT |
DISH C.C. |
PART # |
| KA24E STD.cut .5 |
89 |
33.5 |
0.00 |
12010-40F10 |
| KA24E +1.00 cut .5 |
90 |
33.5 |
0.00 |
12010-40F73 |
| Z24 STD. cut .5 |
89 |
33.5 |
13.00 |
12010-83W01 |
| Z24 +1.00 cut .5 |
90 |
33.5 |
13.00 |
12010-83W03 |
| Z22S STD. |
87 |
35.0 |
9.33 |
12010-06W11 |
| Z22S + 1.00 |
88 |
35.0 |
9.33 |
12010-06W13 |
PRACTICAL PISTON / ROD / CRANK COMBINATIONS
| NO. |
PISTON |
ROD |
CRANK |
PIST/DECK +/- |
CC VOL+/- |
SIZE C.C.s |
| #1 |
KA24E STD.cut .5 |
L24 |
LD28 |
0.13 |
-0.80 |
3098 |
| #2 |
KA24E +1.00 cut .5 |
L24 |
LD28 |
0.13 |
-0.83 |
3168 |
| #3 |
Z24 STD. cut .5 |
L24 |
LD28 |
0.13 |
-0.80 |
3098 |
| #4 |
Z24 +1.00 cut .5 |
L24 |
LD28 |
0.13 |
-0.83 |
3168 |
| #5 |
Z22S STD. |
L28 |
LD28 |
-1.02 |
6.06 |
2960 |
| #6 |
Z22S +1.00 |
L28 |
LD28 |
-1.02 |
6.20 |
3028 |
| #7 |
KA24E STD |
L24 |
L28 |
-1.37 |
8.50 |
2949 |
| #8 |
KA24E +1.00 |
L24 |
L28 |
-1.37 |
8.71 |
3015 |
| ROD |
LENGTH |
PART # |
CRANK |
STROKE |
PART # |
BLOCK |
HEIGHT |
| L24 |
133.00 |
12100-N0102 |
L28 |
79 |
12201-P3000SV |
L28 |
207.87 |
| L28 |
130.35 |
12100-A8703 |
LD28 |
83 |
12201-V0790 |
|
|
COMPRESSION RATIO USING HKS 1.MM HEAD GASKET FOR ABOVE COMBINATIONS
| HEAD |
#1 |
#2 |
#3 |
#4 |
#5 |
#6 |
#7 |
#8 |
| E31 |
11.73 |
11.98 |
9.45 |
9.65 |
8.67 |
8.83 |
9.56 |
9.72 |
| E88 |
11.24 |
11.48 |
9.14 |
9.33 |
8.41 |
8.56 |
9.23 |
9.39 |
| N33 |
10.65 |
10.87 |
8.76 |
8.94 |
8.08 |
8.23 |
8.83 |
8.97 |
| P50 |
10.65 |
10.87 |
8.76 |
8.94 |
8.08 |
8.23 |
8.83 |
8.97 |
| N42 |
11.26 |
11.50 |
9.16 |
9.34 |
8.42 |
8.57 |
9.25 |
9.40 |
| N47 |
11.26 |
11.50 |
9.16 |
9.34 |
8.42 |
8.57 |
9.25 |
9.40 |
| P81 |
11.26 |
11.50 |
9.16 |
9.34 |
8.42 |
8.57 |
9.25 |
9.40 |
| P79 |
9.71 |
9.91 |
8.14 |
8.31 |
7.53 |
7.67 |
8.16 |
8.30 |
| P90 |
9.71 |
9.91 |
8.14 |
8.31 |
7.53 |
7.67 |
8.16 |
8.30 |
| P99 |
9.71 |
9.91 |
8.14 |
8.31 |
7.53 |
7.67 |
8.16 |
8.30 |