Posts: 3508
Location: Elk River, Minnesota | Hiya,
Couple of thoughts here that might be part of the issue.
First, when air and water temps go up, your boat will actually sit lower in the water by a touch, and the motor has to work harder to push the boat out and up. The second thing that happens is with hot humid temps is your motor will not make as much HP as if it were low humidity and 70 degrees out.
Neither of these should cause that much issue with your boat, so I am wondering about the positions of things within the boat. I noticed you mentioned 4 big batteries, a kicker, etc. Are the batteries in the back? Is your fuel tank full as well?
In considering the prop, that rev4 has been a good combination due to the boat design, but vent holes can be a really tricky thing. If all 4 vent holes are wide open, those are pretty large holes and a bunch of exhaust is going to escape from them, even at that 3000 rpm range. THAT is right around the range you want your motor at to be popping out of the hole when you punch it.
I think Shep hit it right.... plug two holes fully, then work your way to larger holes on the other two. Your boat may need more forward thrust happening before hitting it.
Oh...one other thing to at least take a look at...on the motor mounting itself, where is the stop-bar when the motor is trimmed down all the way. Is it in the lowest possible position or one up? If it is any further up (or out) that will cause the bow to rise more and the stern to dig more, which could also be part of the issue. If that bar is not down all the way, I'd see about moving it to the lowest possible position which will allow the motor to tuck under more, giving you more stern lift on hole shot.
Raising the motor will get the boat higher in the water overall on plane, and it might help with the exhaust issue, but I don't think that is where the issue is...I think it is in the prop itself.
Steve
Edited by VMS 7/29/2012 8:17 AM
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