410 Sundancer/Express Cruiser and 400 Sundancer/Express Cruiser **Official Thread**

My exhaust in 6” diameter. I would go bigger, but you could also buy both and return the others.

thanks, I’m gonna measure it I’m down here now but I’m sure ours is the same. They said to put the prob about half way in the exhaust gas so the 2.25” version should fit pretty nicely.
 
thanks, I’m gonna measure it I’m down here now but I’m sure ours is the same. They said to put the prob about half way in the exhaust gas so the 2.25” version should fit pretty nicely.

Mine are Maretron, but 2.25” sounds about right.
 
I went for a ride tonight to see just how overpropped we actually are

full fuel, 2.5POB, 1/2 water, 1/4 holding tank. 1’ chop. All typical running conditions.

we turned 2600 starboard, 2684 port. I won’t know if it’s the props fault we have an 84 rpm delta, but I’m a little worried about it. If the MRI scan shows the props are in equal condition and equal pitch I guess it’ll be time for some engine troubleshooting. They both run beautifully, no smoke, even smooth acceleration, etc.

I’ll have the EGT/boost installed before year end so I can at least check boost on both engines.

based on our 2600 WOT the SBmar prop calc has us at 60% power around 2150 rpm. I’m torn on whether I should just park the boat for the year until we get props scanned though...
 
I went for a ride tonight to see just how overpropped we actually are

full fuel, 2.5POB, 1/2 water, 1/4 holding tank. 1’ chop. All typical running conditions.

we turned 2600 starboard, 2684 port. I won’t know if it’s the props fault we have an 84 rpm delta, but I’m a little worried about it. If the MRI scan shows the props are in equal condition and equal pitch I guess it’ll be time for some engine troubleshooting. They both run beautifully, no smoke, even smooth acceleration, etc.

I’ll have the EGT/boost installed before year end so I can at least check boost on both engines.

based on our 2600 WOT the SBmar prop calc has us at 60% power around 2150 rpm. I’m torn on whether I should just park the boat for the year until we get props scanned though...

You did put in the Aetna digital tachs? Did you confirm with a laser tach on the balancer so you know those max rpm readings are correct? I'd run the boat for the few weeks you have left and have the props scanned over the winter, and not worry about it (easier said than done for a new diesel boat owner)!
 
You did put in the Aetna digital tachs? Did you confirm with a laser tach on the balancer so you know those max rpm readings are correct? I'd run the boat for the few weeks you have left and have the props scanned over the winter, and not worry about it (easier said than done for a new diesel boat owner)!

I do have the aetnas, didn’t stick the laser on the flywheel yet but I will at high idle at the dock friday.

You’re not kidding about being a new diesel owner, lots of nerves lol
 
I ordered the turbocator gauges from ISSpro today and all the bits to hook them up. I liked the 3" turbocator 2in1 gauge and I'll put them on the sides of the lower dash panel opposite the electronics. Not terribly inexpensive, but I'm looking forward to having all this info in real-time especially after the props are done
r609-10_1.jpg
 
Hanging around in the engine room this morning (you all do that right?) and noticed something interesting that might have an impact on my low rpm starboard side.

I can spin the shaft on the port side by hand with no issue - not so much on the starboard side. I can’t get it to budge. It goes in and out of gear just fine, but that engine does lag the other when it’s at low idle in gear. I’m wondering if I have a bind in the driveline somewhere.

I would imagine you should be able to easily rotate both sides the same?

edit: nevermind, I got it turning. It is way tighter than the other side though
 
Ryan, where are you going to mount them?

either side of the lower electronics cluster for now. They’re 3” gauges, they just fit. You have something similar on your boat right? Totally different engines I know, but what numbers do you generally see?
 
That's where my friend has his on his 410 express. It's a good location. Port one is to the left of his hatch lift and the starboard one is to the right of his windlass? I think.

All motors are different even the same engines in different boats will read different. What is important is that they read in your spec range and they read very close to each other. That is your base to judge future changes by.

My boat 2250 cruise is about 18 psi and 875 F 24.5+/- mph
before I got it propped right it was 2250 cruise 23 - 25psi and 850 F 25 +/- mph
My friends 410 express with 6CTA's is 2250 cruise, 25+/- psi, 850 F and 30.5 mph but his boat is lighter and is propped much steeper. He still reaches 100 over wot spec which is where we want these. That shows the difference in boats so you can't use my numbers to mean anything for you.
 
That's where my friend has his on his 410 express. It's a good location. Port one is to the left of his hatch lift and the starboard one is to the right of his windlass? I think.

All motors are different even the same engines in different boats will read different. What is important is that they read in your spec range and they read very close to each other. That is your base to judge future changes by.

My boat 2250 cruise is about 18 psi and 875 F 24.5+/- mph
before I got it propped right it was 2250 cruise 23 - 25psi and 850 F 25 +/- mph
My friends 410 express with 6CTA's is 2250 cruise, 25+/- psi, 850 F and 30.5 mph but his boat is lighter and is propped much steeper. He still reaches 100 over wot spec which is where we want these. That shows the difference in boats so you can't use my numbers to mean anything for you.

yup that’s the spot, windlass on the right side.

Looks like most of the 3116/3126 guys see about 800 and low 20s boost at cruise (when propped right). We’re still low wot on both (starboard more than port) so I’m interested to set a baseline this year before the re-pitch. I would have liked to put the pyros in the manifold before the turbo but I’m not real interested in drilling a hole so I’m going to stick with just after the turbo
 
I'm running 2300-2400 RPM 20-21 kts showing boost 18-20 psi and EGT 760-800*F. Other factors 2/3 fuel 3-4 people, full water trimmed slightly nose down. If I bury the nose with full down trim, EGT rises about 20-25* F. There is a little variation from port to starboard, but that could be instrumentation error (mine is converting to digital and displayed on N2K displays)

I feel very good about these numbers.

20200707_190556.jpg
 
I'm running 2300-2400 RPM 20-21 kts showing boost 18-20 psi and EGT 760-800*F. Other factors 2/3 fuel 3-4 people, full water trimmed slightly nose down. If I bury the nose with full down trim, EGT rises about 20-25* F. There is a little variation from port to starboard, but that could be instrumentation error (mine is converting to digital and displayed on N2K displays)

I feel very good about these numbers.

View attachment 92621

sweet looking dash
 
whereabouts did your engines run on the pyrometer at cruise? I see old posts from Dom saying he was around 800* or so (2100-2300 rpm). How about boost levels?
"A mind is a terrible thing to lose"...sorry Ryan, I don't remember. I do know for MAN CRM 900's, it's just over 1200° - but that doesn't help you! I'm sorry.
Dom was as anal as I am, so I'd take his word!
 
Got most of the way there. I just couldn’t get the plug for the boost to budge so I’ll bring a breaker bar tomorrow and try to break it loose. I was also sort of surprised to not see the exhaust gases register on the gauge with no load, it just shows what a difference load makes on a Diesel engine

they look nice in the dash. I had to put them a little lower than I wanted to not have to cut the mounting flange behind but it just barely covered some of the switch text.


B3CE2728-C98C-41E8-8643-82D8BA9B5315.jpeg
EC1E6375-31FC-4075-8749-C2831657CFB6.jpeg
 
One of my boost plugs was a bitch to get out. I tried a big breaker bar and almost stripped it out. I ended up getting a punch and a big hammer, and hitting it at a low angle to break it loose. Took a couple good whacks! I was worried I’d have to drill it out this winter...but once lose, came right out.
 
Last edited:

Forum statistics

Threads
112,950
Messages
1,422,877
Members
60,932
Latest member
juliediane
Back
Top