Automotive Calculators

Calculators and convertors to work out:

Engine Codes

Code	Model	Engine	BHP	Dates
4-9	Type 1/2	1200 SP	34	May ’59 > Aug ’65
E	Type 1	1300 SP	37	Aug ’65 > Jul ’70
B	Type 2	1600 SP	47	Aug ’67 > Jul ’70
FO	Type 1	1300 SP	40	Aug ’65 > Jul ’70
H	Type 1	1500 SP	44	Aug ’65 > Jul ’70
H	Type 2	1500 SP	44	Aug ’65 > Jul ’68
L	Type 2	1500 SP	40	Nov ’65 > Jul ’68
AB	Type 1	1300	44	Aug ’70 > Jul ’73
AC	Type 1	1300	40	Aug ’70 > Jul ’70
AD	Type 1/2	1600	50	Aug ’70 > Jul ’73
AE	Type 1	1600	47	Aug ’70 > Jul ’71
AF	Type 1/2	1600	46	Aug ’70 > Jan ’80
AH	Type 1	1600	47	Aug ’71 > Jan ’76
AJ	Type 1	1600	50	Aug ’74 > Dec ’80
AK	Type 1	1600	47	Aug ’72 > Jul ’73
AR	Type 1	1300	44	Aug ’73 > Jul ’75
AS	Type 1/2	1600	50	Aug ’73 > Jul ’79
CJ	Type 2	2000	70	Aug ’75 > Jul ’79

SP = single port

Ratios & Speed

This will calculate the rpm for any given gear and any given speed, or speed to rpm. Simply fill in the tyre setup then fill in the calculation fields leaving the field you want to calculate empty. Use the transmission table below for reference.

1. Tyre Setup
80% is standard tyre profile
Tyre Width	Tyre Profile	Rim Size
mm	%
2. Calculate
Tyre code:	Calc.
Gear Ratio:	:1
Final Drive:	:1
RPM:
Speed:

Typical Transmission Ratios

Vehicle	1st	2nd	3rd	4th	Rev.	FD
Type 1 – Beetle
1.2 30 BHP >’60	3.60	2.07	1.25	0.80	6.60	4.375
1.2 34 BHP ’60>	3.60	1.88	1.22	0.89	4.63	4.375
1.3 >’66	3.80	2.06	1.32	0.89	3.88	4.375
1.5 >’66	3.80	2.06	1.32	0.89	3.88	4.125
1.3 ’66>	3.80	2.06	1.26	0.89	3.61	4.375
1.5 ’66>	3.80	2.06	1.26	0.89	3.61	4.125
1303	3.80	2.06	1.26	0.93	3.80	3.875
Auto ’70-79	2.06	1.26	0.89	–	3.07	4.125

Type 2 – Split Screen
36 BHP	3.60	1.88	1.22	0.79	4.63	4.375×1.40=6.125
’60-’61	3.80	2.06	1.32	0.89	3.88	4.125×1.39=5.73
’65	3.80	2.06	1.21	0.82	3.88	4.125×1.26=5.20
’66-’67	3.80	2.06	1.26	0.82	3.88	4.125×1.26=5.20

Type 2 – Transporter ’68-’79
1.6/1.7	3.80	2.06	1.26	0.82	3.80	5.375
1.8	3.80	2.06	1.26	0.89	3.79	5.492
2.0	3.80	2.06	1.26	0.89	3.61	4.857
Auto 2.0	2.55	1.45	1.00	–	2.46	4.26 or 4.45
Other autos	2.65	1.59	1.00	–	1.80	4.36 or 4.45

Type 3 – Fastback, Notchback and Variant
’65-67	3.80	2.06	1.32	0.89	3.87	4.125
’71-’72	3.80	2.06	1.26	0.88	3.61	3.875
’72-’77	3.78	2.06	1.26	0.89	3.79	3.875

Karmann Ghia
1956	3.60	1.88	1.23	0.82	4.63	4.43

New Beetle
1.8T	3.30	1.94	1.31	5th 0.84	3.06	3.94

Data taken from a variety of sources

Fuel Consumption

Calculate your mpg. Tip: You can enter an mpg figure in the MPG field to just convert to Metric and U.S.

Tyre Heights

Compare different tyre and wheel combinations. To keep speedometer readings accurate keep to within 2.5%.
NB Not all combinations are available as tyre sizes. A tyre profile of 80%-82% is considered standard size.