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#1
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#2
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df--
3. "Cruise" speed: there wasn't any obvious way to figure out where to maximize mileage (knotage?). She got up to 3800 RPM and 27kts (according to fish finder) at WOT, and I've read that cruising speed is about 65% of RPMs, but she seems to need 3000 RPM to plane, and then we're only going 17-18 knots. WayneB-- That engine should turn in the mid 4,000 range if everything is set up properly and running right. Normal cruising RPMs are 3,200 to 3,400 RPM (about 70%). df-- Along with the boat came all the paperwork dating back to 1977, including shop manuals for the engine. The specs state 3800 to 4200 at WOT. I'm sure they've managed to find a lot more RPM out of the 350 engine in the last 26 years. |
#3
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#4
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![]() "Dionysus Feldman" wrote in message ... She's a 1977 Sea Ray 240 SRV, which is an enclosed cockpit with a cuddy- type berth. In the catalog they call it a "sedan" boat (catalogs are available from Sea Ray back for quite some time). She has a new bilge pump, steering cables, the baffles are very recent and only 321 hours on her. Her 255 Mercruiser passed a compression test. I owned an 1974 SRV 240 Weekender with the 351 merc for 7 years. Things we found: 1. Sharp changes in RPM cause her to veer sharply. Check the leg for looseness. 2. I didn't notice a distinct "plane" point, as I have on smaller ski boats. I don't know if that's a semi-displacement hull talking, or the size of her or just the way she is. The transition between displacement and plane isn't clear -- that it, the transition is so smooth as to be indistinct. That was the case with my boat also, she just gently came up. It is a heavy hull, that may have something to do with it. 3. "Cruise" speed: there wasn't any obvious way to figure out where to maximize mileage (knotage?). She got up to 3800 RPM and 27kts (according to fish finder) at WOT, and I've read that cruising speed is about 65% of RPMs, but she seems to need 3000 RPM to plane, and then we're only going 17-18 knots. Same as mine. I used the tabs to force a 2800 RPM cruise at 16-17 knots. Max recommended RPM for this model was 4200 RPM but 3900 was all I could get. you could try a lower pitch prop, but I don't know how much it would help. I spend a lot of time at 1500 RPM and 7 knots - quiet, pleasant, and economical. Enjoy your boat Larry |
#5
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Larry--
"Dionysus Feldman" wrote in message ... She's a 1977 Sea Ray 240 SRV, which is an enclosed cockpit with a cuddy- type berth. In the catalog they call it a "sedan" boat (catalogs are available from Sea Ray back for quite some time). She has a new bilge pump, steering cables, the baffles are very recent and only 321 hours on her. Her 255 Mercruiser passed a compression test. I owned an 1974 SRV 240 Weekender with the 351 merc for 7 years. Things we found: 1. Sharp changes in RPM cause her to veer sharply. Check the leg for looseness. df-- Um... what's a leg? and which leg? |
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