Here is the official APBA Link..........http://www.apba-racing.com/apps/news/index.php
Competition Jet Rules
Thursday, April 30, 2009
Competition Jet is an Inboard Endurance Class and govemed by the Inboard Endurance General and Technical Rules as applicable. The following rules, added to the 2009 Inboard Endurance rules under Rule 12, are effective for the 2009 racing season.
APBA COMPETITION JET DIVISION
1. Any hull with a maximum length of 24 feet including pump and extension is allowed.
2. Power to be supplied by one (1) U.S. built automotive or light truck engine including aftermarket parts, with a maximum displacement of 515 cu. in. Cylinder block is limited to cast iron; aluminum heads are optional
A. Chevrolet big block engines must use common wall intake port cylinder heads designed and machined for use with 4.849” bore spacing.
B. A maximum of (2) valves per cylinder is allowed. No overhead cams allowed. All intake manifo1d bases must be cast for a minimum distance of three (3) inches from the intake cylinder head interface or spacer plate. No restrictions on valve train or oiling systems.
C. Naturally aspirated, any form of carburetion or fuel injection is allowed.
D. Engine is to be located forward of the jet drive.
3. The driver must be seated forward of the engine.
4. Single jet drive only used for marine application.
A. Impeller and impeller housing to be mounted above the keel as measured at centerline.
B. No Jet-A·Way or driveline guard required.
C. Must be equipped with a turning rudder that extends at least four (4) inches below the lowest point of the jet nozzle and have a minimum surface area of sixteen (16) sq. in.
D. Jet-O-Vater or Place Diverter adjustable nozzles may be used. A diverter stop is required, and the roostertail is not to exceed four (4) to five (5) feet above the water. This includes fixed nozzle boats. Diverter shall remain in the full down position at all times in or near the pit area or launch ramps until safely on the race course. Failure to do so in the opinion of the referee will result in a one (1) lap penalty.
E. A through-bolted loader must be securely attached, using four (4) 5/16” or larger grade eight or black oxide bolts.
5. All boats and trailers will be numbered. Boat numbers will be a minimum of (10) inches high on both sides, with the prefix CJ a minimum of three (3) inches high.
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