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#1
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In 1991 the first year of the Mercury 2.5L motor. Mercury had an odd duck 2.5L 200hp engine. It had bottom guided 8118 rods, pumper carbs, and a wide 7 petal front half. They put out more than 200hp and were banned from race events. 7 petal front flows a lot better above 7000rpm.
http://www.odbaracing.com/wp-content...BARulebook.pdf Page 22. Stock 200 fishing motors allowed. 5) No Pro Max, 240 Sport Je t, Motorola, High Performance, Special Production, Back door or Custom engine blocks allowed. 6) No 1991 model 14 pedal blocks allowed. 8) No blocks from Mercury with machined rod slots. 9) 10 pedal front halves only. 10) New motors with taller decked blocks with o - ring heads allowed. 11) Only 1 gasket per set of mating surfaces, Maximum thickness .065" 12) HP Mercury Parts Allowed (If it is not listed it is not allowed) a) Exhaust Divider Plate to mount coils. b) One - piece HP adapter plate. c) HP exhaust tuner. d) HP rods bolts allow ed. Rod caps may not be machined or ground for clearance. e) HP metal cage rod bearings allowed. f) Aftermarket flywheels allowed. g) Stock High Performance 260 or drag Stator, Trigger, Switch Boxes, and Plug wires. h) Mercury HP ECU allowed. (A - 2, A - 4, A - 5, A - 6, A - 8, A - 10, A - 13, A - 14, A - 63, A - 48) i) Mercury HP ECU mounting Bracket. j) Mercury HP Fuel Pump allowed. k) Mercury HP Fuel Regulator allowed ************************************************ 7 petal front (14 petal blocks) ![]() vs. 5 petal front (10 petal blocks) ![]() The 1991 200hp 2.5L engines are most easily recognized by the large single water cooled voltage regulator and the pumper carbs. ![]() |
#2
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“7 petal front flows a lot better above 7000rpms “
I like that! The original APBA Jersey Speed Skiffs ran short block Chevy 283’s because they did not require a rev limiter. In the water and out. 60 over they did not last very long, famous for eating valves, which is a very expensive day. But when they were running well, Stupid fun!!! Vezo, Part II |
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