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
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.
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
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.
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