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ContinuousWave: Post-Classic Whalers
Boston Whaler Boats That Can Be Upengined
|Author||Topic: Boston Whaler Boats That Can Be Upengined|
posted 04-15-2010 06:50 PM ET (US)
My old Boston Whaler 235 CONQUEST is rated for up to 250-HP. The new 235 CONQUEST is rated for 300-HP. Can the original be upengined to the 300?
posted 04-15-2010 11:37 PM ET (US)
What does "upengined" mean?
posted 04-16-2010 07:22 AM ET (US)
From what I understand BW will not change your current capacity plate
posted 04-16-2010 08:26 AM ET (US)
Since your Conquest is 20' feet or more the regulations requiring BW to have maximum hp on the certification placard doesn't apply. BW and most other OB boat builders put their maximum recommended hp on the placard. There is no USCG regulations that would prevent re-powering with a 300 hp. Some state laws prohibit re-powering over the maximum for boats less than 20' but none I know of apply that on larger boats. Best to look at your state regulations to make sure.
BW might not cover a hull warranty issue if re-powered over their maximum recommend for your model year. It could be an issue with your insurance company. Since BW doesn't go back and amend the previous years recommendations you may want to contact BW and your insurance company to ask some questions.
posted 04-16-2010 09:07 AM ET (US)
Also check local regulations where you live. I doubt you'd have a problem with local sherriff's on such a large vessel, but many communities have ordinances that specifically state to go by the HP on the placard, regardless of length.
(Note: none of this stopped me from "overpowering" my 150 HP rated 18 with 180 HP in twin engines)....
posted 04-16-2010 09:43 AM ET (US)
Just a theoretical question. I believe that the original rating was due to the availability of the new verado. Maybe someone aound here knows... was the verado 300 available in 2005-2006? The hull is exactly the same.
posted 04-16-2010 09:45 AM ET (US)
Jim "upengined" relates to a bigger egg beater on the transom ;)
posted 04-16-2010 09:55 AM ET (US)
I just answered my own question! Yes it will fit just fine. The main reason engine size is limited by design is weight of the engine. The 235 is designed for 700lb max. The Verado 300 weighs exactly the same as the 225; 635 lbs. Thanks!
posted 04-16-2010 10:46 AM ET (US)
The 300 wasn't but the 275 Verado was. Possible they rated in more conservatively since the boat was new to their line.
Something to keep in mind, though I did read on another site with twin 300's there was only a 1 mph drop. The current owners manual:
posted 04-16-2010 11:47 AM ET (US)
That also true for cars with high compression gas engines. Lower ocatne gas leads to automatic timing retardation to eliminate engine knock, thus a few less HP. What makes the 300 very interesting is that it offers significantly better performance but essentially the same efficiency. An upgrade to a 250 really makes no difference. According to whaler performance specs.
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