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Old 07-18-2011, 09:35 PM   #11
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on a B3 drive, the proper way to start out is drive down...tabs down if needed...hit the throttle and as the boat comes up on plane...reduce tabs first..adjust throttle rpm......then bump the drive up until you feel the boat free up...and your rpm's increase by a few hundred rpms....at this point your on plane...your at the least resistance...and your drive angle is set properly to drive the boat on smooth water...if the drive is too far down..meaning in the down position....your bow will be digging in....if it's too high..(and the b3 drives are easy to get too high)..the drive will cavitate thus loosing effeciency....the comments about a detent and all....those maybe applicable to the volvo drives ..but merc's will tilt up until it hit the stops..then you need to use the trailer button to raise the drive further...there is no detent on the mercruiser drive throttle quadrant.....
if you put the drive angle too high...the drive will cavitate...aka produce bubbles ...and make the noise and of airation...it will loose effeciency ...you will slow down..the rpms will increase...and about the only thing it will do is produce a rooster tail out the back....
is it bad for the drive??...no...won't hurt it...but it does waste alot of gas.....

On a B3 drive..if you bump once...and the drive starts to cavitate....there is a space or what they call the "Celery stick" on the pivot of the drive..that will have to be pulled out by a tech and flipped over to allow the drive to tilt down further.....but most of the time that isn't a problem....that's just an fyi....


SP
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Old 07-18-2011, 09:54 PM   #12
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Steve,

The drive trim toggle switch on my control lever absolutely has a "detent" (for lack of a better word).

If the drive is all the way down, if I maintain light pressure on the top of the toggle (the toggle only moves a little) the drive will raise just a little bit - then it simply stops at it's pre-set angle and the pump stops running even if I hold the toggle on. I can, of course, position the drive at any angle within that limited range. For how and where I boat I am able to simply trim it to it's max preset range and it never cavitates unless I turn very sharply.

To raise the drive more I have to press the top of the toggle harder to over-come the detent. It's almost like a snap that you can feel in the switch.

Dan
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Old 07-18-2011, 10:26 PM   #13
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hmmm...interesting....must be something new then....all 3 merc drives don't have this one...even my 340 with the b3 drives just has a simple toggle for each drive...up...down.....then on the dash is a "Trailer" button..which brings the drives all the way up..

SP


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Originally Posted by ss3964spd View Post
Steve,

The drive trim toggle switch on my control lever absolutely has a "detent" (for lack of a better word).

If the drive is all the way down, if I maintain light pressure on the top of the toggle (the toggle only moves a little) the drive will raise just a little bit - then it simply stops at it's pre-set angle and the pump stops running even if I hold the toggle on. I can, of course, position the drive at any angle within that limited range. For how and where I boat I am able to simply trim it to it's max preset range and it never cavitates unless I turn very sharply.

To raise the drive more I have to press the top of the toggle harder to over-come the detent. It's almost like a snap that you can feel in the switch.

Dan
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Old 07-18-2011, 11:20 PM   #14
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Thanks for all the great input. I believe I am hearing the cavitation. I tried the detent, but mine does not have that. All I get is al up or all down, with no auto stopping in between. The detent is for trailoring on mine.

Thanks again. Love this forum!

Rich
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Old 07-18-2011, 11:22 PM   #15
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one weekend give me a call and we'll go out and double check....


SP
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Old 07-19-2011, 12:47 PM   #16
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Really interesting. No "Trailer" button on my dash. Must all come down to differences in the control stalk.
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Old 07-19-2011, 02:57 PM   #17
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Sounds like a plan! Thanks for the offer! We are heading into the salt this weekend, though not sure where yet. It depends on the wx.
[
QUOTE=seapuppy;16741]one weekend give me a call and we'll go out and double check....


SP[/QUOTE]
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Old 07-19-2011, 04:36 PM   #18
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come up north to Everett...I'll meet ya there...
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I live in my own little world....but it's okay-they know me here!!!

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