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Suzuki 350 duo prop options?

Old 06-18-2019, 02:11 PM
  #21  
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conventional wisdom states more pitch propeller with get you more speed, also WOT speed. Specially since you are hitting 6300 RPM. As long as you get it to 5700 you are good (I went from 25 to 24 props to get from 5500 to 5700, and didn't gain any top speed, just poorer fuel economy.
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Old 06-18-2019, 02:41 PM
  #22  
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Originally Posted by dunc57 View Post
Wow
Thanks for all the help!
I will get a full set (both props) of the bigger props I think they're about $1700, and I will have to ask about the semi synthetic vs full synthetic, but It kind of sounds like that might be my problem.
But me being a novice at this I'm sure not going to start making accusations. IYO if full synthetic oil was used at the 20 hour service and now at 83-84 hours do you think this has done any permanent damage? And if so who do I go after the dealer or Suzuki?
I have spent a lot of money on this setup upwards and over $110k and I have followed the break-in to a tee.
$110k? How did that happen? Thought twins ran around $45-55k?
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Old 06-18-2019, 04:22 PM
  #23  
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Default Suzuki 350

Thatís boat and engine electronics trolling motor and a hole slur of options. I think the engine alone was around 39k
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Old 06-18-2019, 06:16 PM
  #24  
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Iíve got a set of brand new never used 21ís for the 350ís if anyone is looking for a set. Iíll take $1200
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Old 06-18-2019, 06:39 PM
  #25  
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If you bought the boat new, why are you playing with the props? My dealer ran my boat until it had the optimal props before releasing it to me. My DF350's on a light load I will do 63mph at 6100-6200 RPM. On a fully loaded boat (cape horn 32xs): 450 pounds ice, 5 guys, all gear, 270 gallons of fuel I will get 6000RPM at 58mph

Both my motors made oil first 100 hours. I run my motors HARD. So I was shocked by this. I do not think its the high RPM or WOT that stopped my making oil, because I did a lot of that. I had outboard specialties tell me the oil needs to be between high and low, don't start at high. So at the oil change,which I do myself, I left them 1 inch low. Also, they said there needs to be a good load on the motors. WOT doesn't really create a large load. What really fixed my making oil was high speed wahoo trolling. 18mph plowing through 2-3 seas for 20 hours was my cure. Hasn't made oil since wahoo season. So for you, put down your trim tabs and run the motors right below plane speed for a few hours. That will work them hard!

These DF350's are in proving grounds now. I had water in my lower unit due to faulty designed seals. Suzuki changed those out and the unaffected motor. Bonus points to them there. My port motor has intermittent pee issues. Water pump and impeller changed by the dealer and still an issue. Also my port motor shakes and no one knows why. Steering is solid, motor numbers are good, but she has the shakes while running.

I'm 90% happy with these motors. At repower in 5 years I may go Merc 400's just because I want more power :-) . Time will tell what I will do, but the Zuke 350's after 200 hours still have not sold me on as the "Ultimate" machine.
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Old 06-18-2019, 08:44 PM
  #26  
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I have a buddy in NE that has two Cape Horns one in Boston and one on the Cape. He swears by those boats. I think heís powered by Yamies.
So to answer your questions the best I can; I bought this boat in North Georgia and the only place the dealer had to test for the props was on a lake in calm fresh water. Not sure what the difference is but Iím on the Gulf in pretty high salt content water. Surely thereís a difference.
My boat is a lot smaller 28í with a single 350. Boat dry wait is about 3700lbs. 100 gallons of fuel fresh water three bait wells 3 coolers ice supplies and engine Iím probably at about 5800-6200lbs. Itís a very efficient double stepped hull which add to your idea of not working the engine enough. Iíve in 84 hours have only had the trim tabs most of the way down once. So I will try your idea sounds highly plausible to run the bow down plowing working the engine harder. How long (how many hours) do you think I need to run this way?



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Old 06-19-2019, 03:30 AM
  #27  
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I can't offer any meaningful suggestions for you, OP. But, I think it is very cool that you/we can have all of Outboard Specialties expertise at our fingertips - and on a motor they didn't even sell! That shows some real class on their part.
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Old 06-19-2019, 06:27 AM
  #28  
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Originally Posted by Brocnizer1 View Post
If you bought the boat new, why are you playing with the props? My dealer ran my boat until it had the optimal props before releasing it to me. My DF350's on a light load I will do 63mph at 6100-6200 RPM. On a fully loaded boat (cape horn 32xs): 450 pounds ice, 5 guys, all gear, 270 gallons of fuel I will get 6000RPM at 58mph

Both my motors made oil first 100 hours. I run my motors HARD. So I was shocked by this. I do not think its the high RPM or WOT that stopped my making oil, because I did a lot of that. I had outboard specialties tell me the oil needs to be between high and low, don't start at high. So at the oil change,which I do myself, I left them 1 inch low. Also, they said there needs to be a good load on the motors. WOT doesn't really create a large load. What really fixed my making oil was high speed wahoo trolling. 18mph plowing through 2-3 seas for 20 hours was my cure. Hasn't made oil since wahoo season. So for you, put down your trim tabs and run the motors right below plane speed for a few hours. That will work them hard!

These DF350's are in proving grounds now. I had water in my lower unit due to faulty designed seals. Suzuki changed those out and the unaffected motor. Bonus points to them there. My port motor has intermittent pee issues. Water pump and impeller changed by the dealer and still an issue. Also my port motor shakes and no one knows why. Steering is solid, motor numbers are good, but she has the shakes while running.

I'm 90% happy with these motors. At repower in 5 years I may go Merc 400's just because I want more power :-) . Time will tell what I will do, but the Zuke 350's after 200 hours still have not sold me on as the "Ultimate" machine.
Glad to hear you got some bugs worked out.
On the shaking issue, have you tried new spark plugs? I've seen a bad one or two that will still work but gives some shakes. Also check the high pressure fuel filter in the vst.
The peeing issue I would take as debris in the pee hose(sand,weeds,etc...) Has it ever overheated or started to get hot?
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Old 06-19-2019, 10:50 AM
  #29  
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Originally Posted by Outboard Specialties View Post
Glad to hear you got some bugs worked out.
On the shaking issue, have you tried new spark plugs? I've seen a bad one or two that will still work but gives some shakes. Also check the high pressure fuel filter in the vst.
The peeing issue I would take as debris in the pee hose(sand,weeds,etc...) Has it ever overheated or started to get hot?
Motor is always same temp as starboard. Never overheated. It was checked for blockage and they did not find any

spark plugs are new. Just changed them

I'll replace high pressure filter next. Thanks!
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