What would you repower a 1977 Bruno with?

captainlarry84

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KristenFormer Charter Captain
I am assuming that you are talking about a 35 Bruno? If so you are very limit with propeller aperture and most likely a 1.5 shaft. Without doing a major drop shoe rudder & reshafting, I would look to find a 3208 375 HP with a 1.5 TD 507 gear. Or a 3126 CAT with a max of 420 and also a 1.5 gear. With the 1.5 gear your will max out on propeller size, plus the 1.5 shafting will be fine.

We did the boat with a 440 Yanmar 1.75 shafting & 1.77 gear. Swing a 21X20 propeller the boat ran like a rabbit, however it was a very costly repower.

Finding old reliable AKA the might 3208 TA is a very economical way to go. The 3208 is a very easy motor to work on, parts are plentiful and they run great. Keep the RPMs down to 2400 RPMs and the boat will give you years of loyal service.

Lastly I do believe those boats had a center steel fuel tank. Before you get to involved I would research the fuel system.

On the Yanmar Bruno we removed that rusty tank, made a fish box and was able to place two 100 gallon aluminum fuel tanks under the deck on both sides of the motor amidships. I also believe that placing the fuel weight of 1400 lbs. zeroed out the Yanmar weigh reduction of 1000 pounds. The boat sat real nice in the water and ran fairly flat at 19
 

Hooper

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I am assuming that you are talking about a 35 Bruno? If so you are very limit with propeller aperture and most likely a 1.5 shaft. Without doing a major drop shoe rudder & reshafting, I would look to find a 3208 375 HP with a 1.5 TD 507 gear. Or a 3126 CAT with a max of 420 and also a 1.5 gear. With the 1.5 gear your will max out on propeller size, plus the 1.5 shafting will be fine.

We did the boat with a 440 Yanmar 1.75 shafting & 1.77 gear. Swing a 21X20 propeller the boat ran like a rabbit, however it was a very costly repower.

Finding old reliable AKA the might 3208 TA is a very economical way to go. The 3208 is a very easy motor to work on, parts are plentiful and they run great. Keep the RPMs down to 2400 RPMs and the boat will give you years of loyal service.

Lastly I do believe those boats had a center steel fuel tank. Before you get to involved I would research the fuel system.

On the Yanmar Bruno we removed that rusty tank, made a fish box and was able to place two 100 gallon aluminum fuel tanks under the deck on both sides of the motor amidships. I also believe that placing the fuel weight of 1400 lbs. zeroed out the Yanmar weigh reduction of 1000 pounds. The boat sat real nice in the water and ran fairly flat at 19

Larry was that the Bunker Dunker?
 

captainlarry84

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Yes... It's a 35
Then I will stick to my thoughts on the CAT power w/1:5 gear. You can on a push use the 506TD it is rated for 350 HP & in running a 3208 @ 2400 RPMs you will be no where near that HP. Plus for the once & a while WOT you should be find. In addition the higher the reduction the stronger the gear. Meaning a 1:5 is much stronger that a 2.5:1.

Correct it was the Bunker Dunker...sold for a song & currently in South Jeresy.
 

pugsley

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i have 300 hp 3126 with 2:1, 1.75 shaft just changed wheel to 21x24 3 blade at 2400 it cruises 17+ wot 22. i usually run 2200 at 15 kts. i wouldn't go with a 3208, too big heavy, not bad motors but i think there are better choices, maybe one of those 315b cummins
 
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ripta13

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just put a iveco 270 in a 35 bruno it does 22 knots boat comes out of the water and planes its great ! running speed 17 - 18 looks like about 8 gallons an hour . if that helps

thats amazing my 31 bhm has a 430cumming 6cta @17-18kts im in the 14-15gph range. i dont have my floscan 100% dialed in. Is your boat rigged for lobster?
 

chasintail

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Is it the 5.9L Common Rail engine or the 6.7L Mechanical Bosch VE pump engine? Curious.
1998 5.9 I think , bought used so not sure . question:what should be max rpm for that motor? wide open im at 2900 rpm ad running about 2600 35 Bruno 24x 21 prop thanks also looking solenoid, motor wont shut off thanks could you price thanks ron 9789942401:p
 

chasintail

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thats amazing my 31 bhm has a 430cumming 6cta @17-18kts im in the 14-15gph range. i dont have my floscan 100% dialed in. Is your boat rigged for lobster?
it was rigged for lobster, went 7 .5 knots I tuna fish this boat comes out of the water and planes im only burning about 8 gallons while running , more sea trails coming and ill know exeactly what im burning , but its not much 22 crows nest 22 pulpit:p
 

j dandy

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had the 35 bruno made by nauset, should run all day 17knots 2400 506td 1.5 &1.5 shaft
3208t. boat had 3 bunks sinkcounter top port side.
the other bruno had 3116 run about the same, but not the ride 3208 is heaver much better in head sea. can't find my book but think prop was 22x20 with some cup.
 
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