Best choice for repowering 20' MA

[cdavisdb]

A 115 ETEC would be plenty. Terry England of CC has a 25 bertram with twin 115ETECs that runs great. It is about three times as heavy, a lot wider and deeper than a twenty. I had a Seafari 20 with a 150 Black Max that was much faster than I needed offshore. More than plenty of power even with 3 divers, 10 tanks, extra fuel and several hundred lbs of ice and fish.

With a bracket, any engine will be hard to zero in for low speed planing. You will probably have to experiment with props. See Bushwackers posts for the best insight.

Good luck with it!

[gofastsandman]

Originally Posted by cdavisdb

A 115 ETEC would be plenty. Terry England of CC has a 25 bertram with twin 115ETECs that runs great. It is about three times as heavy, a lot wider and deeper than a twenty. I had a Seafari 20 with a 150 Black Max that was much faster than I needed offshore. More than plenty of power even with 3 divers, 10 tanks, extra fuel and several hundred lbs of ice and fish.

With a bracket, any engine will be hard to zero in for low speed planing. You will probably have to experiment with props. See Bushwackers posts for the best insight.

Good luck with it!

Excellent advice here.

These hulls are far more efficient than the formula derivatives.

I have an eagle series 60 degree omc 150 on the transom of my `89 20.
She would not plane under 18 with different stern lifting props.

I put a new tank in last summer and moved it forward.

I also changed the angle of the new coffin I glassed up to hold her.
I had real problems filling the tank because of the angle before.
More weight aft and I had no idea. Now she sits on her lines.

I struggled to maintain plane at 3k rpm.

Now I can hold hard at 2500k with ease and she is sooooo happy.
12 mph. When your hull is wet, she will not pound.

When you go airborne, you will pound.

There is a lot to think about here.

[Snookerd]

Originally Posted by gofastsandman

Excellent advice here.

She would not plane under 18 with different stern lifting props.

I struggled to maintain plane at 3k rpm.

Now I can hold hard at 2500k with ease and she is sooooo happy.
12 mph.

There is a lot to think about here.

Have the Jedi’s and David Copperfield been notified about the magical 12 mph planing ability?? Congrats Sandy. The CSC Bible is never wrong.....

[Topflitegraphics]

Found a really good deal on a 2009 evinrude 130 etec. I have heard the new 135HO is darn good on these hulls. Since this is only 5HP less what do you guys think? Can get the motor and rigging for about 2 grand. Owner is fine with running it on the stand for me and letting me check compression

[Snookerd]

That 135 HO Etec is a detuned 150… I would grab that if you can.

[Topflitegraphics]

Originally Posted by Snookerd

That 135 HO Etec is a detuned 150… I would grab that if you can.

Sorry, that was a typo. Fixed it. The engine is a 2009 130.

[DoozleD]

The 130 ho is not a detuned 150...its a hoped up 115. The 150 is a v-6 and the 115 and 130ho are v-4's I have a 115 and have had no problems with the exhaust valve getting stuck. I have replaced one stuck valve over the years of working on evinrudes, and thats because it had a ton of hours at idle, and not useing xd-100 oil.

[Snookerd]

Originally Posted by DoozleD

The 130 ho is not a detuned 150...its a hoped up 115. The 150 is a v-6 and the 115 and 130ho are v-4's I have a 115 and have had no problems with the exhaust valve getting stuck. I have replaced one stuck valve over the years of working on evinrudes, and thats because it had a ton of hours at idle, and not useing xd-100 oil.

Topflitegraphics edited his post after he caught his typo saying it was a 135HO. The 135HO is a detuned 150, you missed his original posting because it was edited. He first thought it was a 135HO. The DIFFERENT exhaust valve in the 130 is also on the 115HO. If you have one of those motors or have experience on those, that is good to know you have only seen one. If you have a regular 115, then you wouldn’t be dealing with the same configuration.

[gofastsandman]

Originally Posted by Snookerd

Have the Jedi’s and David Copperfield been notified about the magical 12 mph planing ability?? Congrats Sandy. The CSC Bible is never wrong.....

In all fairness, I think my gps is set to kts.

I kinda fell into this Danny.

I changed my prop to on ole SST 1 15 x 16p.

I remembered the discussion w 76Redseacraft years ago.

The exhaust gate you speak of is called the rave on Ski Doos.

Remember, pipes and chambers on the old RD 350s and 400`s would wake
up but you could only tune for high or low end HP. The rave gate closes at low rpm
and opens on the high rpm step.

The SST1 has an exhaust diffuser ring design that I`ve not seen on other designs.
I feel this is the magic bullet. The HP bell curve in my factory manual
shows max at 5k. Above that you are just over spinning the engine.

I had the prop collecting dust and just changed it out for the west coast bent prop
award. I brought the trophy, but nobody grounded out, so no award was presented.

The prop just feels so good and linear. I`ve tried a bunch of props over the years.
It is also light and shifting was much improved as far as my clutch dogs sounded.

No heavy clunk like the 10+ lb props.

[Snookerd]

Nice Sandy. Knots not mph...12 is magic. Sounds like a winner with that prop.