CLASS 1/2 5-1600 ENGINE RULES

ENGINE
The engine must be VW Type 1, 1600 (U.S. Model Sedan component and dimensions) as delivered from the factory.  Maximum engine displacement is 1600cc.  (85.5mm bore x 69mm stroke plus/or minus .015 stroke only).

CASE

ALLOWED:
1. Any type 1, 2, 3 or universal can be used.
2. Align bored.
3 Drilled and tapped for oil pressure and/or temperature sending units.
4. Crank pulley seal.  Machining necessary for installation.
5. Case savers.
6. Seating surfaces for cylinders may be machined.
7. Oil galleries on early cases may be enlarged to that of the universal case (10mm).
8. Oil gallery plugs may be threaded.
9. Any oil bypass pistons and springs.
10. Windage trays.
11. Internal deburring.
NOT ALLOWED:
1. Any other modifications.

BEARINGS
Any manufacturer as long as stock dimensions are maintained.

PISTON ASSEMBLIES AND CYLINDERS
ALLOWED:
1. Any manufactured flat top pistons but stock dimensions have to be maintained (85.5mm).
3. Three ring pistons only.
4. VW #311 �B� rods only.  5.395� plus or/minus .010.
5. Balancing piston assemblies.  One assembly must be left untouched.  The rest can be balanced to the weight of the one untouched.
6. Compression distance open (pin height).
7. Cylinders may be machined for proper deck height.
8. Piston skirts may be drilled.  3 holes 1/8� diameter (.125) each side.  Total of 6 holes.


NOT ALLOWED:
1. Slipper skirts.
2. VW �A� rods (identified by bolts rather than studs).
3. Polishing or profiling.
4. Dished or domed pistons.
5. Notches for valve clearance.
6. Top of piston cut at any angle other than 90 degrees to the side of the piston.

CAMSHAFT AND CAMSHAFT GEAR.
Open.

OIL PUMP
Any manufacturer.
NOT ALLOWED:
1. Deep or dry sumps.
2. Sump alterations.

CRANKSHAFT

ALLOWED:
1. Stock Type 1, 1600 VW only.
2. Any gear.
3. Power pulley.
4. Sand Seals.
5. .030 undersized.
6. Balancing.
NOT ALLOWED:
1. Polishing or lightening.
2. Counterweights.

CLUTCH AND PRESSURE PLATE

ALLOWED:
1. Stock diameter only.
2. Balancing

FLYWHEEL

ALLOWED:
1. Stock VW Type 1 design only.
2. Lightening and balancing.
3. Stock diameter only.
4. Eight dowel pinned.
5. Any gland nut and washer.
NOT ALLOWED:
1. Aluminum


HEADS

ALLOWED:
1. U.S. Sedan Stock single port or it�s equivalent.
2. Flycut for compression.
3. Combustion chamber volume open.
4. Three angle valve seats (15-45-75 degrees).
NOT ALLOWED:
1. Polishing or porting.
2. Combustion chamber shape inner surfaces changed or touched.
3. Angle cutting of heads.
4. Welding for repairs only.  If you flycut too deep for high compression and burn through a spot you can repair it by welding that spot, not 360 degrees.

VALVES AND SPRINGS

ALLOWED:
1. One piece valve of any manufacturer with stock profile only.
2. Stainless steel.
3. Single 45 degree angle.
4. Guide may be bronze, cast iron or steel of any manufacturer and length.
5. Valve guide seal.
6. Any manufacturer of valve springs, spring retainers and lifters.
7. Stock valve spring seat diameter in the heads must be maintained.

NOT ALLOWED:
1. Grinding, polished or porting in any area including valves, port area and guides.
2. Titanium valves or other exotic materials.
3. Swirl polish.

ROCKER ARM SHAFT
ALLOWED:
1. Any which permit use of standard stock (1-1600cc) VW rocker arms.
NOT ALLOWED:
1. Roller or needle bearings either as an interface between the rocker arms and the shaft or a part of the shaft.

ROCKER ARMS

ALLOWED:
1. Stock 1600cc VW rocker arms only 1.1 to 1 ratio.
2. Any manufacturer push rods and tubes.
3. Rocker arm adjustment screws may be of any manufacturer.
4. Rocker arm clips may be wire tied.
5. Resurfacing on adjusting screw end only to permit the use of swivel feet or similar devices.
6. Valve covers any manufacturer.
NOT ALLOWED:
1. Other grinding except that mentioned.









CARBURETOR

ALLOWED:
1. Stock VW 30 PICT 1,2, and 3.
2. Maximum venturi size 24.10mm.
3. Removal of automatic choke housing, choke plate and shaft.
4. Electric needle valves optional.
5. Stock float bowl vent may be moved or plugged.  External float bowl vent allowed.
6. Any air and main jet.
7. Any fuel pump stock or electric or combination.
8. Heater tubes.
9. Air cleaner any manufacturer or location.
10. Velocity stacks.
11. Fuel pressure regulator.

NOT ALLOWED:
1. Carburetor listed as PIC 30.  This carburetor has no choke housing and no numbers.
2. Welding or bonding of velocity stacks to carburetor.
3. Internal modifications.
4. Removal of parts.
5. Polishing or filing.
6. Chemical milling.

INTAKE MANIFOLD

ALLOWED:
1. Stock single port only.
2. Heater tube removal.
3. May be shortened but not welded back together.
NOT ALLOWED:
1. Any method to enlarge I.D. of manifold.
2. Chemical milling.

FAN SHROUDS
Any Manufacturer.
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