225 promax with one piece adapter plate

[Go Time]

Got the midsection altogether for the Pro Max. One piece adapter from a 280 with the chamber built for Poppet discharge and an oval Promax tuner. Integrated trim clamp bracket Modified by Calhoun Marine. Has full trim capability without modifying the factory can. Lower unit is a torquemaster with a JC's cone
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[Greg G]

That thing looks sweet. Can I send you my 280 plate to do the same mod that you show in your picture below so I can run a poppet and stats also?

[tux974]

Mark, looking good! Good idea to use etching primer in water passage. Been doing that for years and it really helps save the surface.....

[bigboy]

Go Time,

Have you done any mods to the block regarding the drain holes or only modified the adapter?
Do you think some tweaking is still needed or should it work perfect with the modified adapter?

When will you hit the water?

Thx

[Go Time]

The object was to not need any mods to the powerhead and be able to use the 1pc adapter and oval Promax tuner with stable temperatures for a variety of inlet water temperatures. I may have put flow diverters in the block when I built it 2 years ago, I dont remember. Not sure when I will actually get to try it. I have a new powerhead on the Allison now that I plan to run for the Spring to get it broke in then put an SVS on. Also have a 260 Im putting in top pin wizzards in. So many motors....so little time. I got a motor hoarding problem

[Greg G]

On a cold icy night here, put together some side by side photos to compare and contrast ............

[Greg G]

Go Time, Have you done any mods to the block regarding the drain holes or only modified the adapter? Do you think some tweaking is still needed or should it work perfect with the modified adapter? Thx

Why do you think that additional mod work would be required to the block itself?

[bigboy]

Why do you think that additional mod work would be required to the block itself?

I never said this is required? Think this is a misunderstanding. Was just wondering if he did modify the block or not because I'm thinking about doing the same for my 2.5 200.

[Greg G]

Ahh, ok. Yes I misunderstood you.

[Greg G]

Finally got the 15" SVS Promax with the modified one pc adapter and the Chapman modified 3 ram clamp together. This is how it turned out.

Attachment 371175

When are you going to get that bad boy out on the water for testing? Looks great! I'm keen on seeing how your mods to the 1 piece plate work out.

[Go Time]

What happened to my post with the picture? Greg quoted it and then it was gone. Here's another pic.

Greg it will be later this summer before I run it. Got a few other motors ahead of it to run.

[bigboy]

I switched to a 1 piece plate last week on my 2.5 200.

I epoxied in a popet dump in the 2.4 BP adapter. I reduced the 4 stock dump holes to 1/8" drains.

My 2 piece plate had 4 1/8" drains that cooled the tuner.

At idle my engine is running cold. On plane the engine runs about the same temperature as before.

I think it's obvious that the 4 1/8 drains are the reason why it's not heating up at low rpms. Can I close them all of except for one (to drain the adapter so water cant sit during winter)?

If I look at my manual it says the 4 holes are to cool the exhaust and prevent the tuner from melting etc? This is worrying me. Also the water helps to keep the waterpump from melting?

[ChrisCarsonMarine]

I switched to a 1 piece plate last week on my 2.5 200.

I epoxied in a popet dump in the 2.4 BP adapter. I reduced the 4 stock dump holes to 1/8" drains.

My 2 piece plate had 4 1/8" drains that cooled the tuner.

At idle my engine is running cold. On plane the engine runs about the same temperature as before.

I think it's obvious that the 4 1/8 drains are the reason why it's not heating up at low rpms. Can I close them all of except for one (to drain the adapter so water cant sit during winter)?

If I look at my manual it says the 4 holes are to cool the exhaust and prevent the tuner from melting etc? This is worrying me. Also the water helps to keep the waterpump from melting?

Are you using thermostats, they work in conjunction with the poppet valve to warm the motor at low speed and cool it at high-speed,Chris

[bigboy]

Are you using thermostats, they work in conjunction with the poppet valve to warm the motor at low speed and cool it at high-speed,Chris

Yes Chris

Was running a 2 piece plate before with tstats and poppet. Just changed the modified adapter...

I feel it's dumping to much water at low speed. The 4 1/8 drains on the 2 piece plate are feeded via the popet dump and thus when popet opens... With the 1 piece adapter they are feeded all the time.

[bigboy]

Pic of the adapter attached.