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thru hull exhuast how much angle needed

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Old 05-23-2012, 11:54 PM
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Default thru hull exhuast how much angle needed

ok gonna try and set the 454,s in my formula this weekend to mock up the engine compartment i have older center dump exhuast . Im going to run flex hose back to transom to the tips i have to cut holes for.. how much of a down hill angle do i need ? or how flat can the hose be any rule of thumb on this...
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Old 05-24-2012, 12:04 AM
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Merc actually had a drawing for this. The nice thing about following that, is if you decide later to go aftermarket, you can use off the shelf tailpipes.
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Old 05-24-2012, 12:41 AM
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Quote:
Originally Posted by jason y View Post
ok gonna try and set the 454,s in my formula this weekend to mock up the engine compartment i have older center dump exhuast . Im going to run flex hose back to transom to the tips i have to cut holes for.. how much of a down hill angle do i need ? or how flat can the hose be any rule of thumb on this...
I did a trial on mine with the small blocks and figure real quick that I had to have tall risers to get over the top of the steering...very tight fit. If I go low I am beneath the swim platform and underwater at rest. Right now I'm leaning towards the Y-Pipes.
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Old 05-26-2012, 02:35 PM
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if the angle is a little off between exh hose and tips the way they are mounted in transom, a guy on here had a good idea for a small angle elbow. take a piece of 4 inch stainless tubing, and cut it about 6 inches long with the cuts at a slight angle. then you can tilt the hose on the tubing for a 10 or 20 degree angle.
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Old 05-26-2012, 08:18 PM
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first one is bbc with a bravo one,second is sb or bb alpha one..funny thing is they both have the same measurements..most formulas have a higher (6'') spacer then the riser so the exhaust will fit into the silent thunder platform..if you dont have a silent thunder~~~~~~~~~~~~~~~~~~~~~~~

wait a min is this the 255 liberator???? your going to be close with the big blocks in their....
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Old 05-26-2012, 10:12 PM
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yes 255 liberator with big blocks..
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