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07-13-2019, 01:04 PM #1
Good water flow/low water pressure
I've got an 86 2.0 150 that I put on an 85 2.4 200 adapter plate. Same lower, same water pump, just ported the exhaust to match. Went from making 25 psi at idle to 10 and now it drops when I bring the rpm's up. Any insight on what's going on? I'm at a loss and have tried plumbing it every which way without pulling the power head.
92 Mirage Ski Racer
86 Laser LTV Bass
82 Hydrostream Vandal Comp
^(project that needs a new home)
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07-13-2019, 01:07 PM #2
Water pump has less than 2 hrs on it and made 20+ psi on old power head at idle. It has a ton of flow just no psi.
92 Mirage Ski Racer
86 Laser LTV Bass
82 Hydrostream Vandal Comp
^(project that needs a new home)
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07-13-2019, 01:48 PM #3
If you made 20 at idle you had an issue before you did anything.
Dave1980 Cougar 19 tunnel,90 2.4L Bridgeport EFI in middle of restoration.
1988 BAJA Sunsport 186, 96 225 Pro Max
79 12' Auminum, 95 Merc 9.9
RIP Stu
"So many idiots, so few bullets"
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07-13-2019, 02:20 PM #4
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07-13-2019, 03:24 PM #5Supporting Vendor
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No Mercury should ever have over 18 lbs pressure at WOT you have a spent water blockage leaving the block or a bad gauge ...
JaybJay @ JSRE
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W2F a V-King liked this post
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07-13-2019, 03:29 PM #6
Sum ting Wong
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07-13-2019, 06:12 PM #7
Gauge possibly but I don't think so. 2 4 was clean inside and had no blockage. New 2.0 is clean as well and nothing else has changed.
92 Mirage Ski Racer
86 Laser LTV Bass
82 Hydrostream Vandal Comp
^(project that needs a new home)
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07-13-2019, 07:18 PM #8Supporting Vendor
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Most of the time your blockage or restriction will NOT be in the engine it will be tuner adapter plates ...
JayJay @ JSRE
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Dave Strong liked this post
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07-13-2019, 07:32 PM #9
Adapter plates were clean as could be. I swapped mids and motor mounts at the same time so I got a good look. I had to open the exhaust port in the 2.4 to match the 2.0 but didnt touch anything else. Made sure the gasket matched too before I bolted it together but I'm wondering if there is a difference in water channels
92 Mirage Ski Racer
86 Laser LTV Bass
82 Hydrostream Vandal Comp
^(project that needs a new home)
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07-13-2019, 07:50 PM #10
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07-14-2019, 03:35 AM #11
It seems that way but it's the same water pump, same water tube, and same 2 peice plate. You would think psi should be closer to where it was. I did go from a 2.4 clamshell cowl to a 2.5 cowl with a pan so I added some height and now wondering if there isn't a good seal on the water tube.
92 Mirage Ski Racer
86 Laser LTV Bass
82 Hydrostream Vandal Comp
^(project that needs a new home)
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07-14-2019, 05:02 AM #12
did you change tha gasket between tha two plates?.. thats what wrong gasket there will do..
Last edited by tlwjkw; 07-14-2019 at 05:36 AM.
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tunnelmike liked this post
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07-14-2019, 06:08 AM #1392 Mirage Ski Racer
86 Laser LTV Bass
82 Hydrostream Vandal Comp
^(project that needs a new home)
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07-14-2019, 08:40 AM #14
there is also a very slight difference in tha 2.0 and 2.4 PH gasket.. on each side of tha exhaust holes one will have 2 small holes and tha other will have 3.. doubt if this makes any difference though...
with a one piece ya may/may not need ta do a lot "adjustin'" with flow ta get temps right.. may involve pullin' PH a few times doin' this... but then again ya MIGHT get it right tha very first time... patience/testin' is key with it.. jmo.
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07-14-2019, 07:33 AM #15Supporting Vendor
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Bad idea !! IMO ...
Last edited by Jay Smith; 07-14-2019 at 07:53 AM.
Jay @ JSRE
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