225 promax with one piece adapter plate

[transomstand]

Lynn, Here is a picture. Just when taking off. The mist is is not from high speed.
I think it's once poppet opens water sprays on the hot tuner and the mist is the result...

Attachment 380831

What I can try is just close of the idle relieves. Thus no mist can exit the offshore housing?
Can I just close these off? My previous offshore leg had no holes drilled in the relieves. With the 2 pieces plate exhaust could relieve through it. I used another housing which has holes drilled at the inside because with the 1 piece plate there is no exhaust relieve via the adapter.

My snout is blocked off for noise. I do like the merc sound but the people around here not that much

Close the holes and drill a couple holes in your block off plate. It will be slightly louder but not overbearing.

[bigboy]

My Promax pan is the full triangle cut. But don't go gettin any ideas, if the temp is good at speed, don't mess with it.

So Pete you would ignore the fact that it runs cold at idle / non plane speeds.

I think the 2 piece plate blocks of some water when entering the adapter. But than again at idle the cooling circuit should be almost closed. Next time i will plug the dump lines of the stats. The bleed holes will make up the drain holes in the plate. If no difference in temp there still should be something differrent with the 2 piece cooling system.

[bigboy]

Close the holes and drill a couple holes in your block off plate. It will be slightly louder but not overbearing.

What would happen if i would close it all?

I might do a trial with some ducktape over the relieves....

[transomstand]

What would happen if i would close it all?

Probably nothing.

[transomstand]

So Pete you would ignore the fact that it runs cold at idle / non plane speeds.

I would definitely want that corrected, you don't want to hammer the gas on an ice cold motor. I was referring to higher speed operation. You're getting good temp so I wouldn't mess with the poppet opening because if you make it larger you're just going to dump more water and make it colder.

[Capt.Insane-o]

Try plugging one of the dump holes in the plate. As for the steam like Bunnymeister said..close off the idle reliefs and poke some holes in your block off plate. If you could open it up and sandwich some stainless mesh to dull the noise would be an option too.

[bigboy]

You have any idea what would happen when all closed off lynn?

[transomstand]

As for the steam like Bunnymeister said.

The bunny could fix it, he's even smarter than tunnels

[Capt.Insane-o]

You have any idea what would happen when all closed off lynn?

Depends how well your poppet dumps but the water pressure will be high. The thing to do is find a set of 2 piece plates and measure the drain and dump holes and just copy that so you get your idle temps back up.

[Greg G]

So you would ignore the fact that it runs cold at idle / non plane speeds.

It might help to get a bit better frame of reference overall. Some questions include do you boat all year round? If not, and you break the boating season in Belgium into 6 month slots like I do here in CT, what is the swing in sea water temperatures coming into your motor over those 6 months? Cold at idle is one temp at month 1 and another temp at month 6. What is your actual "cold" at idle temp now in July?

[bigboy]

It might help to get a bit better frame of reference overall. Some questions include do you boat all year round? If not, and you break the boating season in Belgium into 6 month slots like I do here in CT, what is the swing in sea water temperatures coming into your motor over those 6 months? Cold at idle is one temp at month 1 and another temp at month 6. What is your actual "cold" at idle temp now in July?

Hi,

I now what you are trying to say. And you are right it may be good now but not anymore in april or october. To be honest i just want it right and fixed. It cannot be that hard but it seems it is.

Temps were just fine with the 2 piece. Only thing I changed is the adapter. I think the differences between both plates are:
- 2 piece plate water flows in but has a drain of 3,5mm which enters in the water retour cavity. So basicaly there is a loss of water that flows through the cylinders.
- on the 1 piece adapter there are two drains of 2,8mm. The drains are in the water retour so water gets drained after it went through the cylinders.
- 2 piece plate has a passage that goes to the back of the plate to cool the tuner. This is only when popet is opened. So i think this has nothing to do with my problem.

So basicaly if you want to make the cooling between both adapter as close as possible than I think it should be better to block the drains in adapter. 2 small holes should be drilled in the wall that divides the water entry cavity and the water retour cavity....

[transomstand]

I think it's time to get scientific and start measuring actual temps with an IR gun or other method, not graduations on the dash gauge. Also, I don't recall any pressure readings which will give clues to what that thing is doing.

[tux974]

Wow this is become very interesting. Subscribed for end results.
Pete, I like the scientific idea.....

[Go Time]

I think there maybe some restriction with the gasket in between the upper and lower plate of the 2 pc. The gasket blocks the inlet passage except for 2 ~3\8" holes ....do you think this might have an effect. My gut says no, but then....
What is the water temperature where you are running, what is water press at idle and WOT?

[transomstand]

Pete, I like the scientific idea.....

The bunny made me say it