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  Tech FAQ's

Here at CB Performance Products, we get thousands of emails every week. And since we can't ever seem to have time to answer each one individually (although we try!), we put together some of the most Frequently Asked Questions.

Please take the time to see if your question has been answered, before proceeding to the contact page.

Q: How do I adjust my valves?
A: Adjust your valves with the engine cold and the cylinder at top dead center. Clearance between the rocker arm and valve stem should be .006in (.15mm).

Q: I have just bought a new set of points, what should I set them at?
A: The breaker point dwell should be set at 44' to 50'. If you don't have a way to check dwell, set the point gap to .016in to .020in (0.40 to 0.50mm).

Q: What is the best way to synchronize my dual carburetors?
A: Purchase a Weber or Dellorto Tech Book, which you can find available in our online VW Library Warehouse. Complete tuning instructions are included.

Q: What should I set my ignition timing at?
A: Street applications range from 28' total advance to 30' total advance. Off road applications will vary from 28' total advance to 34' total advance.

Q: What type of oil filter is needed for a CB Performance filter type oil pump #1791?
A: Our #1703 Oil Filter will fit, but if you need to get the part ASAP, then head to your local Auto Parts Store and purchase a FRAM #PH-3600.

Q: How much more horsepower can I expect by installing a CB Performance Turbo Injection Kit?
A: With a moderate amount of boost, 8-12 lbs, you can DOUBLE your engines horsepower.

Q: What can I expect to gain by installing a CB Performance Ultra CFI Injection Kit?
A: You will gain increased throttle response, improved low-mid and high end RPM horsepower. We, on average, see about 10-15% horsepower increase over a comparable size of dual carbs.

Engine Specifications and Torque Recomendations

Crankcase nuts
Crankcase 12mm nuts . . . . . . . . . . . . . . . . . . . 25 ft/lbs.
Crankcase 8mm nuts . . . . . . . . . . . . . . . . . . . . 15 ft/lbs.
Cylinder head nuts
Stock 8mm studs . . . . . . . . . . . . . . . . . . . . . . . 18 ft/lbs.
Chromoly 8mm studs. . . . . . . . . . . . . . . . . . . . 23 ft/lbs.
10m studs . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 ft/lbs.
Connecting Rod Bolts
Stock T-1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 ft/lbs.
UniTech. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29 ft/lbs.
Uni Tech HD w/ARP 3/8" bolts . . . . . . . . . . . . 45 ft/lbs.
CB H-Beam/ARP Bolts . . . . . . . . . . . . . . . . . . 29 ft/lbs.
(consult with other mfgs)
Generator Pulley. . . . . . . . . . . . . . . . . . . . . . . 40 ft/lbs.
Spark Plug. . . . . . . . . . . . . . . . . . . . . . . . . . . . 25 ft/lbs.
Oil Drain Plug . . . . . . . . . . . . . . . . . . . . . . . . . 25 ft/lbs.
Rocker Arm Shaft Nut . . . . . . . . . . . . . . . . . . 22 ft/lbs.
Clutch Pressure Plate . . . . . . . . . . . . . . . . . . 22 ft/lbs.
Stock Gland Nut. . . . . . . . . . . . . . . . . . . . . . 250 ft/lbs.
Racing Gland Nut. . . . . . . . . . . . . . .. . . . . . 350 ft/lbs.

How to calculate Deck Height in CC's

the inch system

Forumla - Bore (in.) X Bore (in.m) X Stroke (in.) X 12.87 = Deck in CC
Example - 90.5mm = 3.563" X 3.563" X .060" X 12.87 = 9.80cc
1mm = .03937

or the Mm system

Forumla - Bore (mm) X Bore (mm) X Deck Height (in.) X .01996 = Deck in CC
Example - 90.5 X 90.5 X .060" X .01996 = 9.80cc

Deck
Piston - Deck Height in CC's 
85.5
87
88
90
90.5
92
94
.030
4.36
4.51
4.62
4.83
4.88
5.04
5.27
.035
5.16
5.34
5.47
5.72
5.78
5.97
6.24
 .040
5.79
6.00
6.13
6.42
6.49
6.71
7.00
 .045
6.71
6.95
7.11
7.43
7.52
7.77
8.11
 .050
7.28
7.54
7.72
8.07
8.16
8.43
8.80
 .055
8.03
8.31
8.51
8.90
9.00
9.30
9.71
.060
8.72
9.03
9.24
9.66
9.77
10.09
10.54
.065
9.46
9.80
10.03
10.49
10.60
10.96
11.44
 .070
10.15
10.51
10.75
11.25
11.37
11.76
12.27
.075
10.90
11.28
11.55
12.08
12.21
12.62
13.17
.080
11.64
12.06
12.34
12.90
13.05
13.48
14.08
.085
12.33
12.77
13.06
13.76
13.82
14.28
14.91

How to calculate Engine CC's

Forumla - Bore (mm) X Bore (mm) X Stroke (mm) X 3.1416" = Engine cc
Example - 90.5 X 90.5 X 69mm X 3.1416 = 1775cc
(to get the Volume of 1 cylinder in CC divide by 4)
Example - 1775 ÷ 4 = 443.75

Bore
Stroke - Engine Displacement in CC's
64
69
74
76
78
82
84
77
1192*
1286*
1378
1415
1453
1527
83
1385
1493*
1601
1644
1688
1774
1818
85.5
1469
1584*
1699
1745
1791
1882
1929
87
1521
1640
1759
1806
1855
1949
1997
88
1556
1678
1799
1848
1898
1994
2044
90
1628
1755
1882
1933
1985
2086
2138
90.5
1646
1776
1903
1955
2007
2110
2160
92
1700
1835
1967
2020
2074
2180
2232
94
1776
1915
2052
2109
2165
2275
2332
*1192 = 1200cc Engine
*1493 = 1500cc Engine
*1286 = 1300cc Engine
*1584 = 1600cc Engine

How to calculate Compression Ratio

Forumla -
Head cc = Deck cc = 1 cylinder volume
Head cc + Deck cc
Example -
69mm X 90.5mm engine size = 1775 ÷ 4 =

443.75cc
 
.060" Deck =

9.80cc
 
Head =

_____50.00cc
   

503.55cc

Compression Ratio Chart

1300, 1500, 1600cc Type I, II & III Single & Dual Port Heads CC in Head - Depth of Flycut

Bore X Stroke
37cc
.140
39cc
.120
41cc
.100
43cc
.080
46cc
.050
51cc
stock
Engine Size

85.5 x 69
9.68
9.31
8.98
8.67
8.25
7.64
1584

85.5 x 74
10.32
9.92
9.56
9.23
8.78
8.13
1699

85.5 x 78
10.82
10.41
10.03
9.68
9.20
8.51
1791

85.5 x 82
11.32
10.86
10.49
10.12
9.62
8.90
1883

87 x 69
9.91
9.54
9.20
8.88
8.45

7.83
1640

87 x 74
10.56
10.16
9.80
9.46
9.00
8.33
1760

87 x 78
11.08
10.66
10.28
9.92
9.43
8.73
1855

87 x 82
11.60
11.16
10.76
10.38
9.87
9.13
1950

92 x 69
10.76
10.36
10.00
9.66
9.19
8.52
1835

92 x 74
11.46
11.04
10.64
10.28
9.78
9.06
1968

92 x 78
12.02
11.57
11.15
10.77
10.25
9.49
2074

92 x 82
12.59
12.12
11.68
11.28
10.73
9.93
2180

_______________________________________________________
If you dont see it here you may always email our tech department at techdept@cbperformance.com.
     
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