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  1. #16
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    Do you still have your boat jimmy?

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  3. #17
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    No hoses at bottom of heads

    Quote Originally Posted by Jimmybar View Post
    YOU HEARD IT HERE FIRST. it was a painfull trail of piston grabs until the penny dropped, water pressure builds up in the exhaust stream when the engine is loaded , enough pressure to push the water back up the water bleed and create a air lock in the top head . the solution is but one. its cheap and effective. the real issue is the relief valve and bowl pressure. if your engine is modfied to make more HP . or your impeller has seen better days the bowl pressure will be affected. ofcourse there are other parameters that effect exhaust pressure . like load . fuel the list goes on . so I came up with THIS solution . vent top head water jacket. and voila . it works . most of the time. VERY CLOSE TO MOD 3 ENGINE BUILD will keep you posted

    I have a 1994 Boston Whaler Rage with a turbojet 115 I was going to move the hoses from the top of the heads but I dont have hoses going to the bottom of the heads what I have is 2 larger hoses going from the thermostat housing into the bottom of the heads did you change the hoses from the stat housing?

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  5. #18
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    g'day fishnchicks,, have been off line for a while , yes still have boat , do have some performance figures now , will post soon ,

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  7. #19
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    you probly worked that out by now , sorry for the way to late reply , check waterfowl one any crossbow v4 , your answer is there ,

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  9. #20
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    This shows water off the top of the heads leading out to pee vents , the water exhaust jacket should have a tapped hole and plug , just like all outboards with this engine,, run this outlet to cool exhaust stream ,that's important,, check your water pressure at wot, s/b 20 psi , the problem im yet to overcome is water pressure at idle , or lack off , going to try a boost pump of a sort , will put that on soon , hoping to supply even 5 psi at idle would be great , also not happy with omc water supply check valve in stator , its a ****ty setup , prone to blockup to easy and starves the block of water , we need to fix this if we want reliabily , any ideas,,,,!cheers
    Attached Thumbnails Attached Thumbnails IMAG0423.jpg  

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  11. #21
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    The adapter plates hold water in these things and crack..they do not self drain and need a shot of anti freeze to winterize. They were a semi solid unit otherwise.

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  13. #22
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    Click image for larger version. 

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ID:	511386from the left to right ,#1, this $2 elbow has cost me thousands to finally realise its the whole problem of water supply , #2. location of elbow #3.. 3/4"bsp straight hose barb fitted into water gallery to filter,, the idea is , any debris that make it past the blow off valve will not get caught until the filter, were it can do no harm . #4 engine bay layout , big red hose not that pretty but works a treat , now at idle there's a steady 2-3psi to the motor ,then when Thermos opens, pee tails are still strong , same at wot , no change in water volume, im hopping there would be another owner prepared to try this because it feels like a eureka moment , I still love this boat , blown a lot of fuel through this thing and stil get the grin when you go past outboards where props fear to go , oh yeah motor mod with piston ports gives a great zinggy power band between 4800- 5700 rpm,,, over 13,000 views on this project and many more hours of fun ,many thanks to all, Regards Jimmybar

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