First Test Day Of The Year.

[Instigator]

My opinion?

Motors are too high.

On any hull, you get ‘em high enough, they’ll let loose and send you for a ride.

On the A Botes, w/them on the edge, a small wave, the bock rocks, wind change, etc….., if the set up is already on the edge, you’re done.

On a tunnel boat, you have training wheels to help keep you straight.

In an A Bote, you’re going for a ride.

[David]

You’d get some opinions on the Allison Facebook page.

I believe there is speed in the lower unit, and suspect the full lip is optimal for 150 HP, but perhaps more than you need.

Maybe give Hydromotive a call. They are Allison people. I had them work a lower unit for my Promax

[hellbents-10]

I think it needs pad work along with a modded sporty. That is just my gut feeling after driving it a bit.

[hellbents-10]

I can run the Tuff at 3" above till it looses all water pressure with no issue. I think the hull design and modded skeg go a long way on this.

[JPEROG]

I had no lip on my 2003 and we were running a 15" 300XS with a bumped limiter. It would run to 110 "like right now". It was a euphoria for my son to float that thing and have it pull so hard with a 32 wheel. Instigator said it best "no skeg in the water, nose hits first, its going to turn really hard". They are a very well built boat, perform incredibly well, but were never intended for the power that we all put on them.

Joe

[whipper]

Setup and trim is your friend to a point for sure. Consistent water sure helps in an Allison. There's alot of faster and as fast top end with more power boats out there now. Its the acceleration I like more than string her out to the last bump of rpm in an Allison. 0-100 in most Allison's with a 250xs or 260+ is hard to beat to that speed. I like the tuff because acceleration is still way up there but stability at 100+ can be achieved in more water conditions. They both are sweet boats for sure. Tuff us like the Grand sport Allison they never made but still should.. haha

[aj06bolt12r]

So lets get to the bottom of this, the dreaded hook. A friend of mine that builds some nice boats says sand the lip off and and put a modded sporty on. I rode with him at 115 in a 20ft boat with a 280 2.5 and it was a rock star. I am thinking the lip is great to accelerate and run up to 100, but it is bad at 100+. People have ran 120 in the SS2000 boats I wonder what they say, or maybe its a secret.

When I hooked mine the lip was already gone.. But if you hit something no amount of pad or LU mods is going to save you...

I think the lip helps an Allison get lift and get the hull out of the water sooner aka at lower speed for better acceleration.. I think the lip helps the boat get lift and run dryer at lower speeds when you have weight in the boat and or run lower HP.. I think the lip probably allows the boat to get better fuel economy..

However I also think the lip makes it harder to set the boat down when slowing down after a high speed pass. I think it causes the bow to slam back down into the water more aggressively if you chop the throttle or if the prop looses bite for any reason.

So in general, I think if you are drag racing or running 200Hp or less or trying to get the best fuel mileage humanly possible in a 20ft V bottom.. Leave the lip alone.. If you always run with a bunch of weight in your boat and don't go for big MPH #'s leave the lip alone. Also if you are trying to preserve every penny of value in your hull leave the lip alone.

If you are going to run the river for miles on end at very high speeds on the regular or run well over 200hp or run heavier engines than a 2.5 or are more worried about safety than that last few % points of acceleration or efficiency... sand the lip off.

Disclaimer... I'm not an expert, I have never had the opportunity to run an Allison with a perfect stock lip... The "Allison Family" is smarter than me.. I just read a lot.

In closing... In my opinion.. For what you are doing.. Sand it off.

[hellbents-10]

That is what we are leaning too, he runs light and we have long runs. I think more seat time in the 80-90 range is in order though.

[whipper]

The lip really doesn't do a whole lot until around 63-66 mph with a 2,5 on an Allison. Gear case mods are just as noticeable as pad and lip changes. Its the whole combination of factors that make the difference turning any boat up faster. :]