Propping a 27 Fountain
#21
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I'm gonna run mine a few times more before changing to a 29-30. I'm still running 51-5200 rpms with the 28 B. This winter might add a supercharger and dana exhaust, if so I'll be changing props again, so I'll stick with the 28 for now.
#22
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I wonder why some have 28 pitch props with the 496 and some have 30? Same drive ratio and I would imagine same x dimension. I tried a 28 bravo and was on the limiter at 3/4 throttle. I can easily spin 5100 with my 30 but my speed seems right in line with everyone else. Oh well I guess like everyone says leave good enough alone but sometimes we can't!!
Matt
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That's why i can't understand why mine came with a 30 with 1.65 gears. everyone one else has 28's? How could the same package not even be on the limiter with a 28. Does mine slip that much more than the next one?
#24
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The performance report on our 2004 27 Fever showed X of 19.5" with 28P B1 RH prop at 5150 rpm (on the rev limiter) and 70 mph.
Last edited by bob_t; 09-23-2013 at 09:12 PM.
#25
My 05 showes 1.65 ratio 19.5 X dimension 28P prop RH and 69 mph. I have seen 68. I tried a BB prop which was a 30P prop cut down and labbed. It did not perform as well as the stock prop. I don't think Fountain leaves much on the table. After trying the BB flop I gave up on any prop changes.
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My 05 showes 1.65 ratio 19.5 X dimension 28P prop RH and 69 mph. I have seen 68. I tried a BB prop which was a 30P prop cut down and labbed. It did not perform as well as the stock prop. I don't think Fountain leaves much on the table. After trying the BB flop I gave up on any prop changes.
#27
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I have done a lot more testing this season. I tried a BBlades labbed 28 P5X and it and was on the limiter at 68.3 mph but it was a nice cruising prop and I think a 29 P5X labbed might be the ticket especially with a loaded down boat. Tried the original 30 Bravo again with light fuel and got 71.4 on GPS at 5100rpm. I am kinda surprised how weight sensitive the boat is overall because real world testing isn't me bye myself with a quarter tank of fuel. Like others have said Fountain is pretty good from the factory and the 30 Bravo seemed to work the best so far. I am trying a Hydromotive quad 4 30 pitch tonight and will let you know if I can improve any numbers or even get on plane.
Matt
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whatever ya do ya need to keep the 8.1 engine speed below 5100 the factory valve spring package doesn't like much over 5000 for long periods of time. when we used to run for merc I lunched a couple 8.1s for the same reason dropping valve springs and valves cause the test required 5100 rpm.
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I have a 03 27 496 Mag HO bravo Ix running a LH BI 30p spinning 5000RPM in summer heat 70MPH all day. When it is cool and dry 5100RPM 71 MPH. The boat really likes chop, the more air you get under the boat the lighter it gets. Water conditions will make or cost a couple of MPH.
#30
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I agree 100% I heard the left hand prop actually is worth a little too. All I know is that when I pull up next to another 27 ft fountain with the same set up I want to be the one looking back not the opposite :-)