Thruhull pickups
08-22-2009 | 11:49 AM
#11
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Crazy Energy
Joined: Aug 2007
Posts: 4,334
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From: Oklahoma God's country no one else wants it.
Super clean set-up! What size are the strainers? Why, did you go to a 1" longer lower? Becareful testing this,you could very easily cook the cylinder heads. Read the temp with a temp gun on the cylinder heads in all 4corners of the manifold at the water outlets, frontand rear. Is your oil temp climbing also and not coming down? I just went through a very costly problem on a top gun. This was posted on the other site SOS under 38 Top Gun cooling problems, if you want to look at it. http://www.seriousoffshore.com/forum...ead.php?t=8435
Last edited by Velocity Vector; 08-22-2009 at 12:19 PM.
08-22-2009 | 12:42 PM
#12
Thread Starter
Crazy Energy
Joined: Aug 2007
Posts: 4,334
Likes: 1
From: Oklahoma God's country no one else wants it.
I have never had sucess with those thru-hull pickups. You should consider a transom mounted pickups with a lead in groove and install pop-off valves on the strainer to bleed off excess pressure. I used a 1.25" diameter pipe wrapped in sand paper to create the lead in groove. It is 5" long and about 3/8" deep. The pickup does not extend past the bottom of the hull. I would also either block off the the drive fed pickups at the inner transom plate. If they pull air, you will continue to have pressure problems. You should also weld a center plate inside the pickup to prevent larger pieces of debris from clogging the pickup.
Last edited by Velocity Vector; 08-22-2009 at 12:44 PM.
.I Redesing the one on the left
08-22-2009 | 05:13 PM
#14
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Crazy Energy
Joined: Aug 2007
Posts: 4,334
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From: Oklahoma God's country no one else wants it.
08-22-2009 | 07:44 PM
#15
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Joined: Jul 2008
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From: Little River SC
Those sportmasters will support enough water, they have to be modified on the openings, you can do it with a die grinder or better tear the lowers down and set them up in a milling machine and end mill the inlets larger and deeper lead-in grooves, if you have a step bottom, I can bet you are getting air in the water system, if so you need to dump the air from the top of the strainers to below the water-line when the boat is not on plane. you can run on 15 psi water press, but, without the air, they will support at least 800 HP for sure. I had a 2004 Top Gun with the same problems. Air is still going to be there on a stepped bottom.
08-22-2009 | 10:48 PM
#16
Thread Starter
Crazy Energy
Joined: Aug 2007
Posts: 4,334
Likes: 1
From: Oklahoma God's country no one else wants it.
Those sportmasters will support enough water, they have to be modified on the openings, you can do it with a die grinder or better tear the lowers down and set them up in a milling machine and end mill the inlets larger and deeper lead-in grooves, if you have a step bottom, I can bet you are getting air in the water system, if so you need to dump the air from the top of the strainers to below the water-line when the boat is not on plane. you can run on 15 psi water press, but, without the air, they will support at least 800 HP for sure. I had a 2004 Top Gun with the same problems. Air is still going to be there on a stepped bottom.
Last edited by Velocity Vector; 08-22-2009 at 10:51 PM.
08-26-2009 | 12:45 AM
#17
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Joined: Jul 2001
Posts: 928
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From: Austin, TX
I would rather have transom pickups but to get them installed I'm thinking I would have to pull headers to get at them is why I choose the thru hull's. I'll be 21 inches in front of the transom. Do you have to pull the drive to get to the inner transom plate? I also have 12" Imco extension boxes.
