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good propshaft height to start whit on twin engine bravo cat

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bor

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I m looking for some input on a good propshaft height on a 30 ft twin engine cat whit bravo its drives

I m gonna work whit external water pick ups and have standard lenght sportmaster lowers as well a set of -2"
my idea was to start high and space down we had a 26 twin outboard cat that was a dog when it was 2" above the bottom then we got it up to 4" above and it was a real good improvement in performance .
so thinking to start at that but a bravo is not the same as outboard so might be comparing apple s to orange
I was wondering if there are some bravo boat owners here that will share there highed .

all input and thought s higly appreciated !

Thx
 
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doubleeagle

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Strongly suggest you contact the builder and talk X-Demintions and shaft heights with him. I am sure they have spent a lot of time with Drive suppliers getting it right. Every boat and every model is different. They will also very with hp setup weight etc.
 
BDMar

BDMar

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What hull, power, weight, etc.?
 
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bor

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Double eagle ,

It s the first i/o so no r&d yet thats what I probaly are going to do

thx



BDMar said:
What hull, power, weight, etc.?
Click to expand...

its a 30 predator hull (Dough wright design ,the old Amt hull ) whit 2 ls engines on drive line s whit 500 hp each side ,estimaded weight 5000-5500 lbs

thx

Bor
 
Riverbound

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bor said:
Double eagle ,

It s the first i/o so no r&d yet thats what I probaly are going to do

thx





its a 30 predator hull (Dough wright design ,the old Amt hull ) whit 2 ls engines on drive line s whit 500 hp each side ,estimaded weight 5000-5500 lbs

thx

Bor
Click to expand...

In English please.
 
2FORCEFULL

2FORCEFULL

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put the bullet level with the tip of the sponson..
 
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2FORCEFULL

2FORCEFULL

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bor said:
I m looking for some input on a good propshaft height on a 30 ft twin engine cat whit bravo its drives

I m gonna work whit external water pick ups and have standard lenght sportmaster lowers as well a set of -2"
my idea was to start high and space down we had a 26 twin outboard cat that was a dog when it was 2" above the bottom then we got it up to 4" above and it was a real good improvement in performance .
so thinking to start at that but a bravo is not the same as outboard so might be comparing apple s to orange
I was wondering if there are some bravo boat owners here that will share there highed .

all input and thought s higly appreciated !

Thx
Click to expand...

out board rock back more with the twins hanging that far back...when I set mine up I went with 2'' shorter drive to get top end,,, suffered everywhere else though
 
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bor

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2FORCEFULL said:
out board rock back more with the twins hanging that far back...when I set mine up I went with 2'' shorter drive to get top end,,, suffered everywhere else though
Click to expand...


Is the bullet level whit the sponson using the -2 lowers or did you start at level and put on the -2 after that ?

thx

bor
 
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