Engine Production Dates

Over the years we have received a number of calls from people asking what the horsepower of an older Wisconsin engine is and what year it was in production to. If you find any inaccuracies please let us know.

Note: A letter "D" at the end of a model name signifies that this engine has a stellite exhaust valve and seat installed. Therefore an Model TH engine is the same as a THD, a Model BKN the same as a BKND, etc.

Our thanks goes to David Swanson, a member of the AESCC as the main contributor to the list below.

  Model Bore
x
Stroke		 #
of Cyl.		 Hp
@
rpm		 Year
Intro /
Disc'd		  Remarks

A1-1/2

2-3/4"
x
3-1/4"

1

2.4
@
1800

1930
1934

 L head,air vane gov,flywheel magneto

A2

3.0"
x
3-1/4"

1

3.0
@
1800

1930
1934
  

A3

3-1/4"
x
4.0"

1

5.0
@
1800

1930
1934
  

A4

3-1/2"
x 4.0"

1

5.7
@
1800

1930
1934
  

A5

3-1/2"
x
4.0"

1

6.0
@
1800

1930
1934
  

AD

2-3/4"
x
3-1/4"

1

3.7
@
2400

1933
1941

 L head,air vane gov,outboard magneto (designed for pump mfgrs)

AE

3.0"
x
3-1/4"

1

4.2
@
2400

1933
1941
  

AES

3.0
x
3-1/4"

1

6.5
@
3200

1933
1941
  

AC4

2-5/8"
x
3-1/4"

4

16
@
2600

1934
1945

 1st 4 cylinder inline air cooled valve in head engine

AF

3-1/4"
x
4.0"

1

5.4
@
2000

1935
1941

 L head,air vane gov,outboard magneto

AG

3-5/8"
x
4.0"

1

6.1
@
2000

1935
1941

 L head,air vane gov,outboard magneto

AH

3-5/8" x
4.0"

1

8.0
@
2200

1935
1941
  

AA

2-1/4" x
2-3/4"

1

1.8
@
2600

1936
1949

 L head,air vane gov,outboard magneto

AB

2-1/2" x
2-3/4"

1

3.0
@
2600

1936
1949
  

AM4

3-1/4"
x
4.0"

4

28.0
@
2200

1938
1944

 4 cyl valve in head, part of AC4 family but more hp

AP4

3-1/2"
x
4.0"

4

31.0
@
2200

1938
1944
  

AK

2-7/8"
x
2-3/4"

1

4.1
@
2400

1939
1955

 Addition to AA & AB family

VD4

2-3/4"
x
3-1/4"

4

16.0
@
2600

1940
?

 4 cyl, L head,v type

VE4D

3.0"
x
3-1/4"

4

21.5
@
2400

1940
1969
  

VF4D

3-1/4""
x
3-1/4"

4

25.0
@
2400

1940
1976
  

ADH

2-3/4"
x
3-1/4"

1

4.5
@
2200

1941
1949

 L head, mechanical gov, outboard
magneto,
replaces AD,AE,AF,
AG & AH

AEH

3.0
x
3-1/4"

1

5.9
@
2200

1941
1949
  

AFH

3-1/4" x
4.0"

1

7.2
@
2200

1941
1957
  

AGH

3-1/2"
x
4.0"

1

8.4
@
2200

1941
1957
  

AHH

3-5/8"
x
4.0"

1

9.2
@
2200

1941
1957
  

VM4

3-1/4"
x
4.0"

4

27.0
@
2200

1944
1953

 4 cyl, L head, v-type, replaces
AM4 & AP4

VP4

3-1/2"
x
4.0"

4

31.0
@
2200

1944
1953
  

TE

3.0
x
3-1/4"

2

11.2
@
2600

1946
1957

 2 cyl, L head addition to VE4 & VF4 family
(same blocks, pistons & rods)

 TF

 3-1/4"
x
3-1/4"

 2

 14.6
@
2600

 1946
1957
  

 ABN

 2-1/2"
x
2-3/4"

 1

 4.6
@
3600

 1949
1955

 L head, higher compression ratio, (replaces AB & AK), to keep pace with improved fuels,. AA obsoleted.

 AKN

 2-7/8"
x
2-3/4"

 1

 6.2
@
3600

 1949
1955
  

 AEN

 3.0"
x
3-1/4"

 1

 8.2
@
3600

 1949
1957

 higher rpm, increased power (replaces AEH. ADH now obsoleted.

 VG4D

 3-1/2"
x
4.0"

 4

 37.0
@
2400

 1953

 4 cyl, L head, v-type. Improved on VP4. VM4 now obsoleted.

 VR4D

 4-1/4"
x
4-1/2"

 4

 56.5
@
2200

 1953
1960

 4 cyl, L head, v-type for increased hp

 ACN

 2-5/8"
x
2-3/4"

 1

 6.0
@
3600

 1955
1983

 replaces ABN and AKN for greater hp

 BKN

 2-7/8"
x
2-3/4"

 1

 7.0
@
3600

 1955
1996
  

 VH4D

 3-1/4" x
3-1/4"

 4

 30.0
@
2800

 1956
present

 4 cyl, even firing addition to VE4D &VF4D family

 AGND

 3-1/2" x
4.0"

 1

 12.5
@
3200

 1957
1991

 replaces AFH & AGH obsoleted.

 AENLD

 3.0"
x
3-1/4"

 1

 9.2
@
3600

 1957
present

 replaces AEN for more hp

 THD

 3-1/4"
x
3-1/4"

 2

 16.8
@
3600

 1957
1976

 2 cyl replaces TF & TE obsoleted.

 V460D

 3-1/2"
x
4.0"

 4

 60.5
@
3600

 1960
1970

 4 cyl, v-type, OHV, replaces VR4D, replaced by V461D

 V461D

 3-1/2"
x
4.0"

 4

 60.5
@
3600

 1960
1970

 4 cyl, v-type, OHV, replaces V460D

 S7D

 3.0"
x
2-5/8"

 1

 7.2
@
3600

 1962
1974

 simplified construction for better cost advantage

S8D

3-1/8"
x
2-5/8"

1

8.2
@
3600

1963
1991

 Addition to S7D family for more hp.

S10D

3-1/4" x
3.0"

1

10.5
@
3600

1963
1976

  simplified construction for better cost advantage

S12D

3-1/2"
x
3.0"

1

12.5
@
3600

1964
1991

 Addition to S10D family for more hp.

TRA10D

3-1/8" x
2-5/8"

1

10.1
@
3600

1964
1976

 Originally designed for tractor applications

V465D

3-3/4" x
4.0"

4

65.9
@
3000

1967
present

 Addition to V461D family, OHV

TRA12D

3-1/2"
x
2-7/8"

1

12.0
@
3600

1968
1991

 Addition to TRA10D family for more hp.

S14D

3-3/4"
x
3.0"

1

14.1
@
3600

1968
1991

 Addition to S10D & S12D family, more hp.

TJD*

3-1/4"
x
3.0"

2


18.2
@
3600

1968
2001

 2 cyl with firing order changed for smoother running, replaces THD

W4-1770 

 3-1/4"
x
3-1/4"

 4

 35.0
@
3000

 current

 variation of 30 hp VH4D, uses many common parts

W2-1230

3.75"
x
3.4"

2

25.0
@
3600

?
1986

 L head, v-twin

W2-1235

3.75"
x
3.4"

2

26.0
@
3600

?
1988

 L head, v-twin

W2-1250

3.75"
x
3.4"

2

30.0
@
3600

?
1995

 L head, v-twin

* The THD is back in production in 2001 to replace the TJD engine, the horsepower was upgraded to match the TJD engine at 18.2 at 3600 rpm. The"D" at the end of a model # means is has stellite valves and seats. E.g. model VE4 and VE4D.

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Copyright (2003) WMC  Last updated 04-26-05