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-   -   Boxes and lowers? (https://www.offshoreonly.com/forums/drives-lower-units/192034-boxes-lowers.html)

KAAMA 08-13-2008 08:16 AM


Originally Posted by Wild Card 09 (Post 2652377)
In my opinion, one of the speed bringing aspects of a box, is that the c.of g. is moved rearward, whilst the drive acts like a third leg stabilising the boat as the hull start to air out.

Before I added the IMCO -2" shorties, my boat seemed a little too stern heavy...not sure if it is because of the weight of the extension boxes or not, but it got to be a little unstable (chine walk) at about 80+mph and I needed the K-planes to stablize the boat. However, applying the K-planes killed the speed.

Once the IMCO -2" shorties were added it gave the boat a different angle of attack or angle of trim and it made the boat sit on top of the water much better---and seemed to have changed the center of gravity so to speak. The ride and handling is a night and day difference.

The propshaft nut centerline sits about 1.5-2" below the boat now so, she throws a little bit of a rooster tail. www.youtube.com/watch?v=Ewc98ti5gN0

Wild Card 09 08-13-2008 11:15 AM

There are so few general rules about boxes, drives and props, and even those have exceptions. My boat ran more stable over crosswakes with the standard drive and 4 blades than it does with the 2" shorty and 5 blades, but it is a trade off against other qualities.

My propshaft is now at 2 1/2" below the pad bottom.

The way the boat will fly straight and level in heavy chop is just amazing and the acceleration that the 5 blade delivers just pulls a smile every time!

Keith Atlanta 08-14-2008 12:41 PM

RBR - If you are out this weekend I will wave you down. I tried the same route as you by using the Stellings so I had the adjustability. The IMCO boxes with IMCO shorties are too bad, you can get shorties cases and install your bravo stuff. The Stellings, although adjustable are a BIG pain in the ass. it is way easier to fool with IMCO spacer plates. You can probably buy mine (IMCO Lowers) in a week... I am putting the bravo lowers back on today.

Keith Atlanta 08-14-2008 12:41 PM

RBR - If you are out this weekend I will wave you down. I tried the same route as you by using the Stellings so I had the adjustability. The IMCO boxes with IMCO shorties are too bad, you can get shorties cases and install your bravo stuff. The Stellings, although adjustable are a BIG pain in the ass. it is way easier to fool with IMCO spacer plates. You can probably buy mine (IMCO Lowers) in a week... I am putting the bravo lowers back on today.

DirtyMoney 08-14-2008 07:12 PM

I will be out probably on Sunday.

hammertime42 08-14-2008 11:52 PM

Tried all kinds of set up's with a 1995 35 fountain went with Imco nutral boxes so you dont move the motor or tail pipe angle or all kinds of other stuff [hatch height] raising your center of gravity all this costs .Then go with Imco drives with the raised cavitation plates you can then go with 3 inch shorties. Imco drives are 3 piece you can change the middle section to [or order them with] a raised cavtation plate. this will keep you from having to change your engine compartment. Never had any problems 750 hp + 102 mph handled great with 12 inch set back. I wen't to a new boat if you need Imco's with raised cavtation plates or just the mids I mat be able to help. Good luck.

fossil fuel 08-22-2008 09:47 PM

Stellings are crap! you lose the drive coupler and inherit a load of broken XR drive issues. Get out the checkbook $$

KAAMA 08-22-2008 11:08 PM


Originally Posted by fossil fuel (Post 2661248)
Stellings are crap! you lose the drive coupler and inherit a load of broken XR drive issues. Get out the checkbook $$

That may be so for some people, but for me I have had the Stellings boxes for 7 years or so and no broken/busted drives. Perhaps it's because of my mild powered naturally aspirated 565cid engines (about 670lbs of torque) and/or how I drive the boat---I don't think I have been too hard on the drives in how I operate the boat.

Keith Atlanta 08-28-2008 05:11 PM

RBR - I took the boxes off. You want first oppty to buy them?

Keith Atlanta 08-28-2008 05:12 PM

$hit - I meant the IMCO lowers. Do you want them?


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