2005    Official      Rule Book

   

The Race Committee has the authority to override any typographical errors or definition of rules in this Rule Book.

 

1

Inboard Boats

 

DVBRC Sportsman Inboard Classes

Sportsman I & Sportsman II

Classification Points system is not applicable.  Qualified entries are by Tech Inspector discretion.  See class requirements.

DVBRC Pro Inboard Classes

Modified Stock

JETS...................................................2 TO 3 POINTS   

FLATS...............................................2 TO 3 POINTS

Super Stock

JETS..................................................4 TO 6 POINTS

FLATS...............................................4 TO 5 POINTS

Competition Eliminator

FLATS...............................................6 TO 7 POINTS

JETS..................................................7 TO 8  POINTS

Super Pro

FLATS AND HYDROS.....................8 TO 10 POINTS

JETS ..................................................9 TO 10 POINTS

Unlimited Inboard

FLATS AND HYDROS...................11 TO 14 POINTS

JETS.................................................11 TO 15 POINTS

Top Eliminator

FLATS AND HYDROS...................15 TO 17 POINTS

JETS.................................................16 TO 18 POINTS

 

Class Requirements

Sportsman I

C     For STOCK ski boats and pleasure boats.

C     No race modifications, mufflers are optional

C     No performance/race, tunnel hulls or runner bottoms.

C     Pump gas only. No racing gas or additives.

C     No Classification Points scored.  Boats are placed in this class by discretion of the Tech Inspector.  All decisions are final.

 

Sportsman II

C     No turbos/superchargers, alcohol/nitro, or N2O

C     No Classification Points scored.  Boats are placed in this class by discretion of the Tech Inspector.  All decisions are final.

Modified Stock

C     No roller tappet cams.

C     No aluminum cylinder heads.

C     475 cubic inch limit.

C     Must hold enough fuel for 3 rounds minimum.

Super Stock

C     490 cubic inch limit.

C     Must hold enough fuel for 3 rounds minimum

Competition Eliminator

C     515 cubic inch limit - Flatbottoms and Jets

Super Pro

C     Hydros limited to 490 cubic inches. 

 

Classification Points

Points will be assigned from four categories:

1.  Hull

JETS:

V - Bottom, Heavy..............................................1 point

V - Bottom, Light...............................................3 points

Tunnel Bottom, Heavy.......................................3 points

Tunnel Bottom, Light.........................................4 points

 FLATS:

V-Bottom, Dead Flat, or Trick Bottom...............1 point

Runner Bottom...................................................3 points

 HYDROS:

Ski Hydro...........................................................5 points

Drag Hydro........................................................7 points

2.  Intake

Single Carb.........................................................1 point

Single Dominator...............................................2 points

Multiple Carbs...................................................3 points

Fuel Injection.....................................................3 points

3.  Fuel

Gas......................................................................1 point

Alcohol...............................................................3 points

4.  Supercharged

Nitrous Oxide.....................................................4 points

Street Blower (up to & including 6-71).............4 points

Race Blower (over 6-71)....................................6 points

Turbocharged.....................................................6 points

 

All Classes

Any boat over the cubic inch limit in its class goes up to the next class regardless of the cubic inch limit in that class.

Notes

1.  Our objective is to have all competitors in a class as evenly matched as possible.  If a boat=s total points clearly positions it in the wrong class, the Tech Inspector is allowed discretionary points that can be added or subtracted from a boat=s score.

 3.  After a boat is pointed-out to it=s class, the boat can only be moved up one class from where it pointed-out.  

2.  Boats in classes with cubic inch limits are subject to a cubic inch pump check at the discretion of the Tech Inspector.   Refusal to be checked will result in disqualification from the race. 

Nitrous Oxide

All boats equipped with Nitrous Oxide will be pointed, at registration, as running with Nitrous. Drivers wanting to run multiple classes can only move up to a higher class.  Boats equipped with Nitrous and requesting to register in a lower class must have the Nitrous system disabled, capped-off, and the bottle removed from the boat.  Boats must either run with or without nitrous, and cannot mix nitrous and non-nitrous classes during a race, even if running two classes.  (Outboard classes excluded from this rule)

 

2

Outboard Boats

1.  General

All entries are restricted to single engine, fiberglass (see note 1) boats having a minimum centerline length of 16 feet (see note 2).  All boats and engines must have been offered for sale to the general public at some point in time.

2.  Racing Classes

     

There is one (1) DVBRC Sportsman class, SPORT RACER.  There are five (5) DVBRC professional classes, PRO, MODIFIED, RIVER RACER, SUPER STOCK, and STOCK.  Specific rules govern each class.  The Professional classes  also have specific weight tables which show minimum weight of a boat as related to engine size.  "Weight" refers to the total weight of the hull, motor, driver, equipment and safety gear.  Refer to "Section 12. General Rules" for additional details.  For boats with stock motors, the minimum required weight is largely determined by the propshaft horsepower of its motor.  Motor size (cubic inches) is

the primary factor used to determine the minimum weight for boats with modified motors.  Gear case type, carburetors, fuel injection or other specific apparatus can also influence the minimum required weight of an entry.  All entries MUST maintain their minimum required weight at ALL times during a race.

 

NOTE:  IF THE SCALE(S) OR LIFTING EQUIPMENT ARE NOT AVAILABLE AT A GIVEN RACE, THE 1994 DVBRC OUTBOARD RULES WILL BE USED AS A CONTINGENCY.

3.  Super Stock Class Rules

1. Boats: Any production hull. No true tunnels or hydroplane type hulls.

2. Fuel: Must purchase and use fuel and oil sold at race site only. No additives allowed.

3. No nitrous oxide or any other type bottle pressure injection used to enhance engine performance. No nitrous bottles in boat, nitrous solenoids must be disconnected.

4. No small gear cases.

5. No aftermarket tuners. OEM tuner and exhaust adapter plate may be modified.

6. No potentiometers, fuel by pass solenoids or any other devices to alter the fuel curve allowed. Multi fuel pump setups must not be sequentially wired or activated. Must be wired in series, one switch must start both pumps.

7. No after market spark retard/advances, electronic or mechanical allowed.

8. No metal removal or any internal cylinder block modifications allowed. No porting, polishing, feathering. No piston, rod or crank modifications. No balancing or blueprinting.

9. Pistons must be OEM or after market made to OEM specs.

10. Maximum of three over bored cylinders, of .030" overbore maximum, allowed only on steel bores.

11. Minimum mid section length is 15". OEM midsection and clamp brackets may be shortened. OEM clamp bracket may be shortened and after market 15" minimum housing used. Inner liners may be removed and housings drilled for exhaust relief. No Champ type mid sections allowed.

12. Gear cases must have functional forward, neutral and reverse and be shift able from the driver's seat. After market nosecones with low water pickups allowed.

13. Pyrometers allowed.

14. Aftermarket lightweight stock configuration motor cowls allowed all motors.

15. After market composite reeds allowed all motors. OEM reed cages for like motor, no modifications to reed cages allowed.

16. Carbureted motors may remove OEM air boxes and use after market velocity stacks.

17. Oil injection and mechanical fuel pumps may be removed and blocked off. Carbureted motors may use in the boat electric fuel pump and after market adjustable fuel pressure regulators.

18. Standard 2" reach spark plugs only. Any heat range, style tip or brand allowed.

19. Lightweight flywheels allowed. All lightweight flywheels must be Diamond Marine.

 Specific Motor Rules and Minimum Weights

 20. High Performance Mercury, 245 hp, 260 hp, 280 hp and 300 hp Drag:

A. Carbureted 245 1350 pounds minimum weight

B. EFI 260 1400 pounds minimum weight

C. EFI 280 1450 pounds minimum weight

D. EFI 300 Drag, center horn 1415 pounds minimum weight (with current port specs)

E. 300 Drag with eyebrow ports with 1440 pounds minimum weight centerhorn (2001 and newer with 37cc o‑ring heads)

F. Rev limiters may be removed

G. EFI motors in this group may use OEM Drag ECU (A‑48, A‑63, A‑6) and fuel pressure regulator

H. (1) 260 1.490" to 1.520" exhaust port height specs.

(2) 280 1.490" to 1.510" exhaust port height specs.

(3) 300 1.500" to 1.510" exhaust port height specs.

(4) 300 (eyebrow ports) 1.460" to 1.475" exhaust port height specs.

I. Required standard head gasket on Drag Engine.

J. If during repair, any metal was removed from deck, thick head gaskets must be

used.

(1) 260 27‑822844‑1 head gasket part number

(2) 300 27‑840322‑1 head gasket part number

K. 2:00 or 1:87 gear ratio only.

L. All motors this group must use OEM 37cc minimum heads except 260.

M. All components must retain stock factory configuration from the adapter plate up except as noted.

N. 260 Mercury may use 26cc heads.

O. 280 Mercury may use 260 electronics.

21.High Performance Mercury, 280 hp with standard 280 electronics:

A. Minimum weight 1325 pounds.

B. Rev Limiter may be removed.

C. 2.00, 1.86, 1.75 gear ratio allowed.

D. Alternator belt to remain functional while in competition.

E. All components must remain in stock factory configuration from adapter plate up.

22.Pro Max or Laser style EFI Mercury: factory production steel sleeve block only

A. Minimum weight 1350 pounds.

B. Rev Limiter may be removed.

C. OEM lightweight flywheel allowed. No modifications.

D. High performance early style 16 amp alternator allowed.

E. OEM 1" thick reed manifold spacer plate is allowed.

F. 26cc minimum chamber OEM heads allowed.

G. Throttle body may be bored. No welding or other modifications to plenum.

H. Stock fuel injection configuration must be maintained, (injectors, fuel rail, regulator etc.)

I. Fuel injection ECU must remain in stock configuration inside and out.

J. All components must retain stock factory configuration from the adapter plate up except as noted.

23. OMC 3‑Liter Looper:

A. 1350 pounds minimum weight.

B. After market light flywheel allowed.

C. Early OEM small charging system may be used.

D. Rev limiter may be removed.

E. After market or cut OEM heads may be used, 36 cc minimum chamber volume.

F. OEM looper carbs only, boring not allowed, any jetting.

24. Yamaha 2.6 liter:

A. 1350 pounds minimum weight.

B. After market light flywheel allowed.

C. Rev limiter may be removed.

D. Early OEM charging system and spark advance allowed.

E. After market or cut OEM heads, 33cc minimum chambers.

F. No long rod motors in this class.

G. OEM carbs for like motor, boring is allowed.

4.  Pro Class Rules

1.   Restricted to "V" bottom, tunnel and modified tunnel bottom hulls.

2.   Any fuel and/or fuel additive is allowed.

3.   Nitrous oxide is not allowed.

4.   Any lower unit except a speedmaster is allowed.

5.   An engine cowl (modified or stock) covering the flywheel is required.

6.   Refer to the Pro Class weight table to determine the exact racing weight for boats with various size engines. 

7.   Kill switch is required on electric fuel pump(s).

8.   No multi‑speed shifting midsections or multi‑speed shifting lower units.

9.   Minimum recommended boat length 17' 6".

.

5.  Modified Class Rules

1.   Restricted to "V" bottom, Tunnel, and modified Tunnel hulls.

2.   Fuel is limited to gasoline with Two‑Cycle outboard oil only. Two‑Cycle oils containing oxidizers

 or fuel additives of any kind are not allowed.    

3.   Nitrous Oxide is not allowed.

4.   Any lower unit except a speedmaster is allowed.

 Must have F‑N‑R shiftable from driver's seat.

5.   Small diameter lower units (other than

speedmasters) can be used but are assessed a 50 pound weight penalty (note: when a small diameter lower unit is standard on a particular motor, there is no penalty)

6.   An engine cowl (modified or stock) covering the flywheel is required.

7.   Refer to the Modified Class weight table to determine the exact racing weight for boats with various size engines.

8.   Kill switch is required on electric fuel pump(s).

9.   No multi‑speed shifting midsections or multi‑speed shifting lower units.

10.  Only OEM factory produced components are allowed except as noted.  Modifications to factory components are allowed unless specifically excluded or limited.

11.  Aftermarket TPI, fuel regulator, fuel pump, spark plugs, stator, trigger and switchboxes are OK.

12.  Engine porting modifications are OK.

13.  No stroker crankshafts.  Crankshafts can be balanced but not lightened.

14.  No Mercury/Mariner Z‑Ports or 2.5 Bridgeports.

15.  OEM or equivalent after market pistons only.  Pistons may be modified.

16.  OEM connecting rods only.  Rods may be modified.

17.  For EFI motors, the ECU, fuel rail, and injectors must be OEM. 

18.  No remote fuel curve altering devices either electrical and/or mechanical including vacuum pumps, potentiometers, fuel bypass solenoids etc.

19.  Multiple fuel pump setups must not be sequentially wired or activated.

20.  Center Air Inlet Merc HP EFI up to 3.625"

maximum diameter bore OK.  No welding, grinding or fabrication on plenum permitted.

21.  AMS/SVS/MAD EFI induction systems or mechanical fuel injection or Center Air Inlet Merc HP

EFI with greater than 3.625" bore allowed with 50 pound weight penalty.

22.  All Carbureted entries must use outboard motor carburetor