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    How to calculate the ideal propeller pitch for my motor boat?

    I would like to establish the ideal propeller pitch for my Chrysler 20 HP model 2003 circa 1969 that came originally with an 8 1/2" dia. X 8 1/2" pitch propeller and is now mounted on a Boston Whaler 11 Sport from 1986 which has a displacement of 560# considering that my motor could run at 5500...
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    Chrysler Powerflow Lower Units

    Did any manufacturer adopted the design of Chrysler Powerflow Lower Units used in the three cylinder engines and above? <br /><br />Did these units had exhaust after and through the propeller or just after the propeller?
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    Mistake in Chrysler 1981 propeller!

    Was propeller size for the 1981 Chrysler 20 HP was 10 1/8" X 12 1/2" not 8 1/2" X 12" similar to the 1982's Chrysler 25 HP?
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    1969 Chrysler 20 HP Gear Ratio vs 1981 model

    My 1969 Chrysler 20 HP comes with a 14:21 gear ratio and an 8 1/2 " X 8 1/2" propeller, the 1981 model has a 2:1 gear ratio and an 8 1/2" X 10". If the 2:1 is a reduction ratio, at WOT the 1981 motor will rev. at half the motor speed. But in my case my motor will over rev. the propeller...
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    Chrysler 35 HP in Boston Whaler Sport 11

    What could possibly happen if I place a Chrysler 35 HP (142# with alternator) in my Boston Whaler Sport 11' in place of my actual 20 HP (72# manual start)?<br /><br />Will the transom stand the additional torque? Will the boat tip and tilt at wide open throttle? <br /><br />Could jacking up...
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    Chrysler 35 HP in Boston Whaler Sport 11

    What could possibly happen if I place a Chrysler 35 HP (142# with alternator) in my Boston Whaler Sport 11' in place of my actual 20 HP (72# manual start)?<br /><br />Will the transom stand the additional torque? Will the boat tip and tilt at wide open throttle? <br /><br />Could jacking up...
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    Chrysler 20 HP and Boston Whaler 11'4' Speed

    Boston Whaler has sent the following information about my recently restored boat:<br /><br />"This comes up as an 11' Sport model (console steering). The 11' Sport is 11'4" long, 5' beam, 6" draft, 250lbs estimated dry weight, 560lbs max weight capacity, 750lbs swamped capacity, 3 person<br...
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    Fuel Consumption at WOT

    My 1969 Model 2003 Chrysler 20 HP fuel consumption at WOT during 5 straight hours was 3 galons of fuel mix per hour at close to the Caribbean Sea level with a fully laden Boston Whaler 11 Sport Model downstream. <br /><br />My mechanic claims that only the Yamaha 25 HP and Mercury 25 were the...
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    TCW-III and Carbon Buildup

    Why is decarbing in Chrysler and Force engines so critical even while using a good quality TCW-III oil whose main properties among others, were to combat and curtail carbon build up in the combustion chambers?<br /><br />My 1969 Chrysler 20 HP probably through little use from my father had very...
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    12 vs 6 blade impellers

    My 1969 Chrysler 20 HP with short of 30 hours of use, overheated after a 5 hour rally "climbing" a river in Costa Rica. The mechanic found that the 12 blade impeller had one blade almost torn out, now the impellers have only 6 blades for this motor and I feel that if it overheated with 1/12 of...
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