Best choice for repowering 20' MA - Page 3

Bigshrimpin · #21 11-22-2018, 01:25 PM

The four stroke 2.1L 115 Mercs (Either the Command Thrust or the ProXS) weigh in around 360lbs which is very close to the weight of a two stroke yamaha 130. They both put out more than 115hp. They are mini versions of the Merc 150 3.0L 4 stroke design.

https://www.centralgeorgiamarina.com...eorgia-3859603

gofastsandman · #22 11-22-2018, 10:19 PM

Quote:

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 · #23 11-22-2018, 10:43 PM

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

DoozleD · #24 11-23-2018, 08:50 AM

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.

Bigshrimpin · #25 11-23-2018, 11:26 AM

Quote:

Originally Posted by Snookerd

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

My 23 will slow down and hold 12 - 13 mph in any sea. This particular day was calm. Torque curve of the Merc 150 peaks at 3000rpm.
https://www.youtube.com/watch?v=g00ui60dc60

Snookerd · #26 11-23-2018, 11:40 AM

Quote:

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.

Snookerd · #27 11-23-2018, 12:05 PM

Quote:

Originally Posted by Bigshrimpin

My 23 will slow down and hold 12 - 13 mph in any sea. This particular day was calm. Torque curve of the Merc 150 peaks at 3000rpm.
https://www.youtube.com/watch?v=g00ui60dc60

Tim-Nice!! That’s what I’m talking about! Sandy was just saying his setting were on knots....My Zuke DF 300 transom mounted planes at 12 knots. I was referencing a post where Kmoose did not think that we could plane at that speed in a 23. See below....

Quote:

Originally Posted by kmoose

I don’t think it’s a stretch for a twenty but for a 23 with the added dead rise... 10-12 would be some David Copperfield shit.