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Author Topic:   ACTUAL performance with Johnson 90/Nauset

Eric posted 08-24-2001 09:45 PM ET (US)
In the past I claimed a top speed near 50 with my new motor, and 13 3/8 X 17 Viper prop. I'd like to correct that. On the GPS I got 43 in the open Gulf at 5700 to 5800. The motor's redlined at 5500, so that was a real brief blast, less than 10 seconds. I don't know what I gave up with the addition of a grabrail and windshield, but the 4L Jeep went from an easy tow at 70 plus to liking about 62 threatening to overheat with any more (it's been really hot in FL lately). Lots more wind resistance, especially since the non-original console has a nearly vertical windshield and is also raised three inches. The motor is mounted all the way down (bottom holes). It feels like I gave up at least 3-5 mph with the added wind resistance. It's possible that I might have been shading 50, but unless I take off the windshield I'll never know. I'm wondering if I should start raising the motor?
Clark Roberts posted 08-25-2001 08:04 AM ET (US)
Eric, when you raise engine you will most likely need to prop up to at least 19" pitch to keep those rpm down into the proper range (maybe 56-5700 max lightly loaded). Not only will rpm and speed go up but you will probably notice a new lightness and ease to the steering as you will have less underwater drag.. I would suggest that you install a Doel-Fin (my opinion that it keeps a cap on the prop, holds water to cooling intake holes etc) ... Watch the engine temp and "tattle tale stream" as you raise engine and raise until you get ventillation on take off and/or blow out on hard turns and then drop it back one hole. Without a set-back bracket or jack plate you should keep the anticavitation plate no higher than one inch above keel... Others may have more/different suggestions... Happy Whalin'.. clark.. Spruce Creek Navy

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Author	Topic: ACTUAL performance with Johnson 90/Nauset
Eric	posted 08-24-2001 09:45 PM ET (US) In the past I claimed a top speed near 50 with my new motor, and 13 3/8 X 17 Viper prop. I'd like to correct that. On the GPS I got 43 in the open Gulf at 5700 to 5800. The motor's redlined at 5500, so that was a real brief blast, less than 10 seconds. I don't know what I gave up with the addition of a grabrail and windshield, but the 4L Jeep went from an easy tow at 70 plus to liking about 62 threatening to overheat with any more (it's been really hot in FL lately). Lots more wind resistance, especially since the non-original console has a nearly vertical windshield and is also raised three inches. The motor is mounted all the way down (bottom holes). It feels like I gave up at least 3-5 mph with the added wind resistance. It's possible that I might have been shading 50, but unless I take off the windshield I'll never know. I'm wondering if I should start raising the motor?
Clark Roberts	posted 08-25-2001 08:04 AM ET (US) Eric, when you raise engine you will most likely need to prop up to at least 19" pitch to keep those rpm down into the proper range (maybe 56-5700 max lightly loaded). Not only will rpm and speed go up but you will probably notice a new lightness and ease to the steering as you will have less underwater drag.. I would suggest that you install a Doel-Fin (my opinion that it keeps a cap on the prop, holds water to cooling intake holes etc) ... Watch the engine temp and "tattle tale stream" as you raise engine and raise until you get ventillation on take off and/or blow out on hard turns and then drop it back one hole. Without a set-back bracket or jack plate you should keep the anticavitation plate no higher than one inch above keel... Others may have more/different suggestions... Happy Whalin'.. clark.. Spruce Creek Navy