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Post Info TOPIC: Catalina 30 Engine Replacement


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Catalina 30 Engine Replacement


Read our Catalina 30 Repower Write Up - https://www.betamarinenc.com/engine_repower/catalina-30/

Existing Power: The early Yanmar, Universal 5411 and Atomic-4 engines were phased out in favor of the 3-cylinder Universal M-25 and then M25 XP diesels during the middle 80s.

Repower Recommendations

The Beta 20 is the preferred engine for this vessel. It produces all the power required for excellent motoring and low speed handling, while also providing excellent efficiency. The Beta 20 fits the engine compartment with minimal or sometimes no modification required.  

Beta 20 - https://www.betamarinenc.com/engine/beta-20/

Beta 20 Atomic 4 Replacement - https://www.betamarinenc.com/engine/beta-20-a4-replacement/



-- Edited by Keith on Saturday 25th of January 2020 09:16:17 AM

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Wondering why a Beta 20 would be the replacement for a Universal M25? Seems like it should be a Beta 25.


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The Catalina 30 is a very popular boat and has a big following.  We have repowered a lot of these over the years and the Beta 20 is the right fit.  The Catalina 30 only weighs around 10,000 lbs so it doesn't need much to push the boat to hull speed.  The other thing to consider is prop size.  Most Catalina 30s cannot fit a prop bigger than 13" in diameter.  To use more horsepower you will need at least a 14" diameter prop.  Also if you look at the specifications of the Universal M25 it's continuous rating is 21 hp.  The Beta 20 has a broad torque band that actually puts out a bit more torque than the old M25.  I hope my explanation helps and if you need more information please feel free to give us a call.



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