What size wheel for a 28 BHM with 300 up 3116? Speed?

Alison Tuna

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Guy down here looking for a wheel for his 28 BHM. Inch three quarter shaft, 300 horsepower cat 3116, twin disc tranny... Probably 1.5 to 1? No idea...

Asking what the right wheel is as well as what the speed numbers will look like? Where's the sweet spot? Fuel burn at 17 knots?

Said when he bought the boat 3 months ago seller said boat did 22 knots hooked up but knew he needed a different wheel. Cruises at 17 seller said...

Just trying to help out these southerners understand these bad ass boats....
 

Alison Tuna

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Also wants to know if having the exhaust pipe three quarters submerged will effect the motor regarding back pressure....

Told him to join the forum but he is computer shy....lol.....oiy!!
 

mudhake

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Ronnie, you have a 22x24 with a light cup. I have a friend of mine with one of my 28s but I cant remember if its 300 or 350hp. The boat is a loaded tuna boat and the thing shits and gits, 28knts tops. full length lift rail at the waterline with 14ft sprayrails right on top of it. If I remember correctly, the wheel is 24x26. The engine is a 3116ta cat
 

captainlarry84

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With a 3116 @ 300 HP a wheel of 23 X 22 is about correct with a 2:0 gear

With a 3116 @ 300 HP a wheel of 21 X 17 is about correct with a 1.5 gear

T to TA = 50 more HP. you cannot make as T a TA with a lot of changes. Not worth it plus the T stays together better.

The exhaust 3/4 below will have no pressure as once you are running the entire transom is water free. My concern with a pipe that low would be taking a gulp of water in rough weather at anchor. Does the boat have a surge tube & muffler?
 
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mudhake

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I just spoke to a good friend of mine who has one of my 28 bhms with a 3116 cat at 300 hp with a 506 twin disc 2to1 gear. He has a 24x24 4 blade wheel with a number 3 cup.He gets 2850 rpms wide open with a top speed of 27knots. He cruises at 2250rpms and gets 17 to 18 knots. The boat has the new rudder design and full length lift rails. Hope this helps.
 

captainlarry84

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I just spoke to a good friend of mine who has one of my 28 bhms with a 3116 cat at 300 hp with a 506 twin disc 2to1 gear. He has a 24x24 4 blade wheel with a number 3 cup.He gets 2850 rpms wide open with a top speed of 27knots. He cruises at 2250rpms and gets 17 to 18 knots. The boat has the new rudder design and full length lift rails. Hope this helps.

That is a lot of wheel I have those #s for a 350HP 3116 but not the 300 HP
 

mudhake

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The boat runs out of the Merrimack river. He keeps it in Amesbury,Ma. He uses the boat tuna fishing all the time. The engine was a cat complete rebuild 5-6yrs ago. The prop came from accutek and has been tweaked twice for performance. The boat is immaculate and so is the engine. The owner is a cracker jack mechanic and that is his trade. I did two 300hp cummins years ago with 2to1 gears and both boats had 24x25 wheels.
 
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