Originally Posted by
Aeroliner
It seems like the rules are very clear for this class. Having built a Merc 44 for the class and seeing Tims engines I beleive they are well within the limits of the rules. The smaller OMC is allowed to use any carb the way I read the rule book.
5. No additional reed ports or carburetors are permitted on a motor from the number specified by the
manufacturer. No other/additional means shall be used to introduce an air/fuel mixture into the
engine crankcase area from outside the motor. On the OMC 49.7 cu in block, any OMC one barrel
carburetor with a venturi of 1.250 (+/- 0.15) and a bore of 1.500 (+/- 0.015) may be used. On the
44.9 cu. in. OMC where any OMC outboard motor carburetor is permitted. No size or measurement
specs apply to reeds or carburetors, however material may not be added to increase the size of the
carburetor throat and reed ports. This specific rule does not apply to the Mercury 4 cyl/44 cu. in.
and 6 cyl./60 cu. in. motors.
6. On service engines that may use a design other than reed cage induction, the manufacturers
specifications and tolerances shall be retained throughout the whole intake system from carburetor
intake mouth to intake ports in the cylinder wall.
7. No superchargers or turbochargers are allowed. This refers to mechanical devices used to increase
the amount of air/fuel mixture being fed into the engine. This does not refer to scoop or length
tuning of the carburetor intake.
8. Mercury 650, 4 cyl 60/62 cu. in. motors may use any make, type or size carburetors, conventionally
(front) mounted, 2 carburetors maximum, adapters may be added.
9. All APBA Modified safety rules apply and on carburetors or fuel injectors having throttle slide valves.
They shall be adjusted to fully close.
10. Only single barrel carburetors are allowed, except 44.9 cu in OMC (45SS).
MERCURY 6 CYLINDER 60 CU. IN. MOTORS - see spec sheet
1. Fueling may only be accomplished through and via a maximum of 3 conventionally mounted, single
barrel carburetors of any make or size.
2. It is not permissible to have removable cylinder heads on this motor.
MERCURY 4 CYLINDER 60/62 CU. IN. MOTORS – see spec sheet
1. Fueling may only be accomplished through and via a maximum of 2 conventionally mounted, single
barrel carburetors of any make or size.
Alan
Bookmarks