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Author Topic:   GUARDIAN 22: Rated HP and Performance

13Supersport posted 11-06-2004 08:44 PM ET (US)

I have a 1990 22 Boston whaler Guardian. Some of these boats had 155 v6 OMC's. How do I know if mine can handle
the 310 hp ? The brass plate on the console reads
22' utility boat
Capacity 11 persons
Builder Boston Whaler INC
Commercial Products Division
Rocland MASS- JAN 1990
The boat has 2 100 OMC's later models. How much of a difference in performance with 155's ?
Kind regards,
Doug Gifford
fla656 posted 11-07-2004 11:18 PM ET (US)
Can you advise what your Utility Boat number is (Should be on the builders plate you quoted)It would be like UB9001, 90 being the year and the last two digits being the navy boat hull number.This would help. Also can you email me some pics of your boat, would love to see some! Also a pick of the transom,the builder's plate and overall pic of interior could help identifing it.

jimh posted 11-08-2004 12:21 AM ET (US)
Boat speed increases exponentially with horsepower increase, but the exponent is, unfortunately, 0.5--the square root. If you double the horsepower the boat speed will only increase by a factor of 1.4.
Going from 200 to 310 horsepower is an increase of 1.55. The boat speed will increase by a factor of 1.25.
13Supersport posted 11-08-2004 10:01 AM ET (US)
The Brass Tag reads :
Reg # 22 UB8841
I will take some pictures in a few days. The boat is getting a new mooring cover at Dor-A Mar Canvas in Bohemia NY. I sent a letter to Boston Whaler asking for specifics about the boat.
Kind regards,
Doug Gifford
LHG posted 11-10-2004 02:13 PM ET (US)
Although I think a 22 Outrage/Guardian can generally handle a pair of 150's, particularly the older Merc 2.0 liter models, BW commercial division had a special extra-cost option on law enforcement/military versions to handle the twin 150's.
Yours may, or may not, have been built that way (additional transom reinforcement).

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Author	Topic: GUARDIAN 22: Rated HP and Performance
13Supersport	posted 11-06-2004 08:44 PM ET (US) I have a 1990 22 Boston whaler Guardian. Some of these boats had 155 v6 OMC's. How do I know if mine can handle the 310 hp ? The brass plate on the console reads 22' utility boat Capacity 11 persons Builder Boston Whaler INC Commercial Products Division Rocland MASS- JAN 1990 The boat has 2 100 OMC's later models. How much of a difference in performance with 155's ? Kind regards, Doug Gifford
fla656	posted 11-07-2004 11:18 PM ET (US) Can you advise what your Utility Boat number is (Should be on the builders plate you quoted)It would be like UB9001, 90 being the year and the last two digits being the navy boat hull number.This would help. Also can you email me some pics of your boat, would love to see some! Also a pick of the transom,the builder's plate and overall pic of interior could help identifing it.
jimh	posted 11-08-2004 12:21 AM ET (US) Boat speed increases exponentially with horsepower increase, but the exponent is, unfortunately, 0.5--the square root. If you double the horsepower the boat speed will only increase by a factor of 1.4. Going from 200 to 310 horsepower is an increase of 1.55. The boat speed will increase by a factor of 1.25.
13Supersport	posted 11-08-2004 10:01 AM ET (US) The Brass Tag reads : Reg # 22 UB8841 I will take some pictures in a few days. The boat is getting a new mooring cover at Dor-A Mar Canvas in Bohemia NY. I sent a letter to Boston Whaler asking for specifics about the boat. Kind regards, Doug Gifford
LHG	posted 11-10-2004 02:13 PM ET (US) Although I think a 22 Outrage/Guardian can generally handle a pair of 150's, particularly the older Merc 2.0 liter models, BW commercial division had a special extra-cost option on law enforcement/military versions to handle the twin 150's. Yours may, or may not, have been built that way (additional transom reinforcement).