COR 2.0 Technical Rules
Rule 4: Classic Outboard-2.0 Technical Rules
V-6, Inline 6 (T-2) and V-4 (Looper and Strangler) engines originally manufactured and made available to the general public with a displacement of 125 cu. in. or less. Engines built and designed by the manufacturer strictly for racing shall be prohibited. The engines must be naturally aspirated and run on gasoline containing no oxygen-carrying additives introduced to the combustion chamber in any way. The maximum displacement for any engine shall be 130 cu. in. Unless specifically forbidden in the following, engines may be modified in any way. All engines must adhere to the midsection, lower unit measurements and weight as specified in the COR 2.0 rules.
MERCURY V-6 2.0 MANUFACTURED POWERHEADS:
1. V-6 Mercury engines must be of a standard production design. Special purpose engines shall not be allowed. Ports may be modified, raised, or enlarged, but shall remain in their original
positions. Additional ports may not be added to the cylinders. “Behind the Liner” engines shall be prohibited, as shall finger porting, and Bridgeport exhausts. The cylinder head volume shall not be less than 26cc’s, measured using a surface gap plug. Combustion chamber quench area shall have a minimum of 0.100” band at the perimeter that is on the same plain as the deck surface. There shall be no fly-cutting of the heads allowed. Pistons must be of a flat top design with no dome or modifications made to increase compression.
The engine may have no more than 6 carburetor venturis, measuring no more than 1.327 at the venturi. EFI engines shall not be allowed. All critical or performance related parts/components (except pistons, rings, bearings, reeds, replacement electronics and sealing components) shall be made by the OEM. Parts may be exchanged from other years or HP models. No other aftermarket parts or mixing of parts from other manufacturers shall be allowed.
2. MERCURY INLINE 6 AND OMC V-4 MANUFACTURED POWERHEADS:
These engines must be carbureted. Powerheads must exhaust no higher than the midsection and must comply with the general rules governing Classic Outboard Runabout (COR) Engines.
a. OMC engines must be equipped with production based intake components: e.g. front half, intake manifold, maximum of 4 plastic single barrel carburetors.
b. Mercury inline 6 engines must be equipped with production based intake components: e.g. front half, intake manifold and a maximum of 3 carburetors with a maximum throat of no more than 1.327" measured at the venturi.
All powerheads must be mounted on an exhaust adapter plate sold by the OEM. Modifications are allowed. Midsections must be a minimum of 15 inches and made by the OEM. The swivel bracket attaching the engine assembly to the boat must be made by the OEM for an engine with same configuration as the powerhead used. Modifications are allowed. All COR engines must exhaust no higher than the midsection. Power trim systems may use any type of component.
Lower units must be produced by the OEM for the powerhead in use. (Exception: 2.0 V6 Mercury engines must use the larger lower unit housing measuring 4.7 inches at the aft-most point just ahead of the prop. OMC and Mercury inline sixes may use any shiftable gear case. Lower units must have a functioning forward, neutral and reverse operable from the driver’s seat and must be a thru hub exhaust. Water pickups may be modified or relocated, but must be located on the lower unit. Pointy noses may be added to L/U. Prop shaft center line shall be no higher than 1 inch below the bottom most portion of the aft planing surface of the boat. Engine jack plates with power adjustment must be disconnected in a location not accessible from the driver’s seat and must be inspected and “sealed” prior to the race.
The measurement for the height of the prop shaft shall be measured with a straight edge placed on the bottom, 36 inches forward of the transom and parallel to that flat portion of the boat. Any rocker in the bottom of the boat aft of this point shall be disregarded in the measurement as the straight edge runs on out to the prop shaft for measuring purposes. A boat with a built-in “hook” shall be measured in the same manner; however, the straightedge will be placed in the area 36 inches forward of the transom and will again contact the bottom in the aft area of the “hook” running on out to the prop shaft. Prop height from a boat with a concave pad shall be measured from the lowest part of that pad.
V, Flatbottom or Modified V-Bottoms are allowed in this class. General Rules are as follows: All boats must have an “open” cockpit and may not be “cowled-in”. An open cockpit shall consist of an undecked area that is at least 36” wide and 48” long.
Boats complete with engine and accessory equipment such as fuel tank, steering, seat etc. shall weigh a minimum of 1550 lbs including the driver, safety equipment and remaining fuel. Ballast may be added to boats so long as it is securely anchored in the boat in a manner so as to prevent it from detaching in event of an accident. No single piece of ballast shall weigh more than 50 lbs. Boats adding more than 40 lbs. shall be required to attach the ballast a minimum of 3 feet forward of the inside of the transom. (Any combination of batteries in excess of 120 lbs shall be considered ballast.)
Water shall not be used in any way as a form of ballast. All boats shall be weighed “dry” at least once a year by an APBA official. The boat’s weight shall be documented, and a form attesting to the actual weight of the boat on that date must be signed by the official APBA inspector. The form shall include a list of equipment on the boat and include all ballast. To the documented boat weight, the weight of the driver at any given race shall be added. The driver shall be weighed with all required racing equipment. Additional weight checks on any boat/driver combination may be required at any time by the APBA referee at any race.
A request for a weight check directed to the referee, signed by all of the “other” driver/owners, shall constitute a valid reason for the referee to perform a weight check on the boat and driver in question. If there are no local scales capable of weighing the boat in question, the documented weight may be used. The driver’s weight as determined by a bathroom-type scale, added to the documented weight of the boat, shall equal or better the minimum weight of 1,550 lbs. All boats are required to have safe lifting straps at every race so this rule can be implemented at the discretion of the race referee.
Minimum boat length shall be 18’ 6” measured from the bow to and including the transom. Nonstructural protrusions may not be added to boats to comply with the minimum length rule such as setbacks / jackplates / false additions to bow and/or sponson. The intersection of the driver’s seat and seat back shall be within 48” of midship.
SPECIFIC RULES referring to V-Bottom, Flatbottom, Modified V-Bottom:
1. V-Bottom or Flatbottom boats are permissible in this class with the following restrictions: On either, the rectangular area of the bottom extending from the aft end to a transverse line four feet forward of the aft end of the boat bottom (transom) and bounded by for and aft lines one foot to either side of the boat centerline is subject to the following limitations:
a. No part of this area shall be above any part of the boat bottom outside this rectangle, with exception of longitudinal grooves of depth no greater than 1 1/2 in. formed by strakes or lengthwise steps. Any lengthwise protrusions that can be construed as air traps shall be prohibited. The Turn Fin must be mounted within 2 feet of the centerline of the boat and may be no longer than 20 inches.
b. No part of this area may contain breaks in the longitudinal continuity of the planing surface that would provide steps such as on a hydroplane.
2) Modified V-Bottoms are permissible in this class subject to the following rules:
a. These boats must have a center pod extending below or at least even with the outside sponsons. Starting at the transom, the pod must be a minimum of 8” wide with a cross section width taken from the plane between the tips of each sponson carrying forward for 36” in the same plane as developed between sponson tips. The planing surface of the pad must not vary more than 1/4 inch when measured across in the last 36 inches of the boat.
b. The outside sponsons may extend a maximum of 3” aft of center pod measured from the farthest aft portion of center pod, including protrusions, extensions and fins on outside sponson.