dual port heads??

David_Girdner

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MarkAcunaOffRoad said:
I just bought a 2-1600 with a single port engine. Would like to get it turned into dp. This might be a dumb question, but is the rule: dual port into dual carbs or dual port into single carb? Is there a restrictor plate required for 2-1600? Any and all information on this subject would be greatly appreciated!!

Single 30 Pict 1 carb allow for either single and dual ports. You will have to get an adapter to make this carb fit the dual port intake. 2-1600 cars are required to run a 24 mm plate.

From SCORE's website
CLASSES ½-1600, 5-1600, AND CLASS 11 UNDER CR23:

Heads

Heads may be U.S. sedan stock single port or dual port or their equivalent. Heads may be flycut for clean up. No porting or polishing is allowed. Only dual port heads from Brazil, part number 040 101 375 2, 040 101 375 13, 040 101 375 19, or stock OEM heads will be allowed.

Intake manifold is restricted to a stock 34mm original equipment center section or its replacement. A 1½-inch (1.500) long by half-inch (.500) diameter tube may be weld two inches below carburetor flange. A maximum of a ¼ inch (.250) may be removed from each end of the center section for clearance. A slip tube with a 1 5/8 inch (1.625) diameter, two inches (2.000) long may be welded to the end of the runners to allow the use of a better hose connection. No porting or polishing.

End castings must be original equipment VW, with VW logo and part numbers. No porting, polishing, or matching of ports allowed. Balancing slot may be welded close. Vacuum hole may be plugged. A 34mm to 30 mm carburetor adapter must be used. The only carburetor adapter that is allowed is the EMPI part number 98-1293-B.
 

hammer down racing

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I originally started this thread in November and it is funny to see how wrong some people were. Our dp motor has about 9 more hp and quite a bit more torque than our single port. The peak torque is a little higher rpm wise than the single port. We are very happy with the motor.

Mark, who do you plan to do your motor? Our guy is in Lake Havasu and we are extremely happy with his work. If you want more info, pm me.
 

Racbaja

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When you started this thread the motor builders were still working on the DP heads issue. As with any rule change builders adapt and figure it out so people were not wrong, motor builders finally figured it out with cam experimentation and dyno time.

Ron Plunkett
Plunkett Racing
 
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