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I have a 42 fountain 2006 with staggered 525 with 32p 4 blade bravo she will hit 80 at 5200 rpm with trim at 5 on the gage. no problems with overheating. Are you getting good water pressure ?
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Originally Posted by sommerfliesby
(Post 3996506)
in 2006, fountain made 42 lightnings and 35 lightnings...which one do you have?
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You're new to high performance boats and have a Fountain with twin 525's? Take Tres Martin's course!
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A 38 Lightning with 525's should come with 32 pitch 4 blade Bravo 1's. The boat should run around 90 at 5250 rpm.
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Sounds to me like you may need transom mount raw water pick ups but i would be surprised if it did not have them already.. The 5 is a lot of prop for that set up i would think a 28 or 30 B1 but thats just a guess on my part, and yes the 28 will bring up the rpm
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How many hrs are on he motors?? The first thing you lose is RPM when the motor is getting weak. Might what to check that.
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Props are too big, especially with the extreme high air temps you have. High ambient temps cause a loss of HP.
If you switched to 27" Maximus props or 30" Bravo 4 blades you would see about 5100rpms. |
Originally Posted by Griff
(Post 4000487)
Props are too big, especially with the extreme high air temps you have. High ambient temps cause a loss of HP.
If you switched to 27" Maximus props or 30" Bravo 4 blades you would see about 5100rpms. |
Originally Posted by glassdave
(Post 3996700)
Sounds to me like you may need transom mount raw water pick ups but i would be surprised if it did not have them already.. The 5 is a lot of prop for that set up i would think a 28 or 30 B1 but thats just a guess on my part, and yes the 28 will bring up the rpm
120 degree ambient temp will hurt power a lot, surely it should call for at least one pitch less than normal |
Thanx Keytime looks good!!
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