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Formula 370 SS prop question

Old 08-01-2007, 06:45 PM
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B R
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Default Formula 370 SS prop question

at the suggestion of "Magicfloat" I'm posting this here as well (could not move it)

Can anyone comment on what pitch props are correct for this boat? It's powered with 496 HO engines. The boat is taking 20 to 25 seconds to come up on plane and has a top speed of about 54 mph.

The dealer had 26p's on it and it worked fine when I test drove it. but when i bought it, the dealer put on 28's because it reved too high.

any comments would be appreciated.

thanks

Last edited by B R; 08-02-2007 at 09:49 PM.
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Old 08-01-2007, 09:19 PM
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The deal is since day one the 370 used 26 props. Every one we have sold uses 26's. Formula has recently started a prop evaulation for all new boats,if the rpm's exceeds Merc's rating, then theorectically the dealer goes up on pitch. But in the real world a little bit above the rpm range is not that big of a deal. I am guessing your dealer is wanting the rpm to be at a level that Merc suggests,but that is not real world.A little above the recommended rpm with a light load is no big deal as 370's are usually run with heavy loads Not his fault at all,just tell him you want your 26's back. A 370 needs 26's,end of story.Every 370 we have ever sold with 496HO's has 26's.

Last edited by Magicfloat; 08-02-2007 at 07:20 AM.
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Old 08-02-2007, 07:32 AM
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Thanks for the help.

The Marina owner is taking the boat for a drive today and calling me afterward. I'm hoping they realize it's not planing correctly.

I owned a 34PC until this boat and the PC planed faster than this one does now. I'm sure it'll be taken care of, I just wanted to bounce this off someone for a sanity check.

Last edited by B R; 08-02-2007 at 09:50 PM.
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Old 08-02-2007, 07:43 AM
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Magicfloat,

How fast should this boat plane out? Boat Test says 5.7 seconds. Is that correct?
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Old 08-02-2007, 09:13 AM
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That's pretty close,Powerboat Mag says 6 sec.
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Old 08-02-2007, 10:58 AM
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Originally Posted by B R
Magicfloat,

How fast should this boat plane out? Boat Test says 5.7 seconds. Is that correct?
I have a 370SS and that seems about right.

Also, 55 is my top speed.
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Old 08-02-2007, 04:45 PM
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Originally Posted by Magicfloat
The deal is since day one the 370 used 26 props. Every one we have sold uses 26's. Formula has recently started a prop evaulation for all new boats,if the rpm's exceeds Merc's rating, then theorectically the dealer goes up on pitch. But in the real world a little bit above the rpm range is not that big of a deal. I am guessing your dealer is wanting the rpm to be at a level that Merc suggests,but that is not real world.A little above the recommended rpm with a light load is no big deal as 370's are usually run with heavy loads Not his fault at all,just tell him you want your 26's back. A 370 needs 26's,end of story.Every 370 we have ever sold with 496HO's has 26's.
i haven't heard back yet, but do you think formula would void my warrantee if i push to get the 26's back on?
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Old 08-02-2007, 04:58 PM
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No
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Old 08-02-2007, 09:37 PM
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I was just called and long story short, we're going to switch out the props and test it again under real load. it was tested without much gas, no water and one person on board. we'll re-test under normal operating conditions.

i really do love my marina.
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Old 08-06-2007, 07:08 PM
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I took out my 370 again and I have 496HOs. This was only my second time in the boat.


I am running 28s, turning 4900 RPMs at WOT. I was also FULL on fuel.

Time to plane was 12-13 seconds every time I tried it. I never tried dumping the tabs down, just normal starts. It made no difference if I hammered the throttles or not, the boat accelerated the same each time.

Your top speed is right on with mine.This was also freshwater at a lake near Phoenix. If that makes any difference?

Last edited by Magic34; 08-06-2007 at 11:32 PM.
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