Notices
Like Tree5Likes

Suzuki 350 duo prop options?

Old 05-20-2019, 05:50 AM
  #1  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2010
Posts: 1,712
Default Suzuki 350 duo prop options?

I took delivery of my new 28’ hybrid boat with a single 350 Suzuki and it had 24 pitch props on the boat. I wanted a little faster hole shot so swapped to 22.5 pitch props. After running 30 hours with the 22.5p I think I prefer the better cruise and will give up a little slower time to plane. Before I buy another set of props I wanted to see if anyone has heard about after market props for the new duo prop Suzuki.

I have not seen anything online yet, but I may have missed something.

Thanks
cp5899 is offline  
Old 06-17-2019, 01:21 PM
  #2  
Junior Member
 
Join Date: Aug 2018
Posts: 21
Default Suzuki 350

So we might have the same setup did you buy the Bluewave 2800?

dunc57 is offline  
Old 06-17-2019, 01:48 PM
  #3  
Senior MemberCaptains Club Member
THT sponsor
 
Outboard Specialties's Avatar
 
Join Date: Jan 2007
Location: Pompano Beach, FL
Posts: 1,964
Default

As far as I know as of now there is no aftermarket props available for the 350 suzuki duoprop.

What are your rpm's WOT with both set-ups?
Outboard Specialties is offline  
Old 06-17-2019, 03:32 PM
  #4  
Junior Member
 
Join Date: Aug 2018
Posts: 21
Default

Mike
Have you ever heard of an outboard engine growing oil?
I have a brand new boat and Suzuki 350 engine with 82 hours on it.
I've done the break-in procedure as recommended and started having black suet on the back of the engine.
I was told to check the engine oil for possible water leakage (milky white) I didn't see that but did notice the oil level was about 1" over the high mark on the dipstick. I bought an oil extractor took about 2 quarts out and then went out and ran it for a couple of hours.
The oil grew again this time about a 1/4", any idea what might be going on?
dunc57 is offline  
Old 06-17-2019, 04:43 PM
  #5  
Senior Member
 
Join Date: Dec 2014
Location: Land down under
Posts: 9,892
Default

What is a Suzuki duoprop?

I can't find any mention of this at the Suzuki website.
alloyboy is offline  
Old 06-17-2019, 04:44 PM
  #6  
Senior Member
 
Join Date: Dec 2014
Location: Land down under
Posts: 9,892
Default

Originally Posted by dunc57 View Post
Mike
Have you ever heard of an outboard engine growing oil?
I have a brand new boat and Suzuki 350 engine with 82 hours on it.
I've done the break-in procedure as recommended and started having black suet on the back of the engine.
I was told to check the engine oil for possible water leakage (milky white) I didn't see that but did notice the oil level was about 1" over the high mark on the dipstick. I bought an oil extractor took about 2 quarts out and then went out and ran it for a couple of hours.
The oil grew again this time about a 1/4", any idea what might be going on?
Referred to as "making oil". Not uncommon on any brand or any model four stroke outboard motor.

Do a Google search. Read to your hearts content.

https://www.google.com/search?q=suzu...hrome&ie=UTF-8

Theory is that the piston rings have not yet seated. Fuel is getting from the combustion chamber across the piston rings and into the crank case.
alloyboy is offline  
Old 06-18-2019, 06:04 AM
  #7  
Senior MemberCaptains Club Member
THT sponsor
 
Outboard Specialties's Avatar
 
Join Date: Jan 2007
Location: Pompano Beach, FL
Posts: 1,964
Default

Originally Posted by dunc57 View Post
Mike
Have you ever heard of an outboard engine growing oil?
I have a brand new boat and Suzuki 350 engine with 82 hours on it.
I've done the break-in procedure as recommended and started having black suet on the back of the engine.
I was told to check the engine oil for possible water leakage (milky white) I didn't see that but did notice the oil level was about 1" over the high mark on the dipstick. I bought an oil extractor took about 2 quarts out and then went out and ran it for a couple of hours.
The oil grew again this time about a 1/4", any idea what might be going on?
It does happen, typically from piston rings not seating properly and getting fuel blow-by from cylinder back into the oil cavity like mentioned above. Also what oil are you using? You cannot use a full synthetic on these motors until at least 200 hours are on the motor, these full synthetics do not allow enough break in and will also cause blow-by. You also need to run these motors hard periodically, you cannot always baby them or you will get cylinder glazing causing the same issues. Over propping is another issue, what is your WOT rpm?
dunc57 likes this.
Outboard Specialties is offline  
Old 06-18-2019, 06:06 AM
  #8  
Senior MemberCaptains Club Member
THT sponsor
 
Outboard Specialties's Avatar
 
Join Date: Jan 2007
Location: Pompano Beach, FL
Posts: 1,964
Default

Originally Posted by alloyboy View Post
What is a Suzuki duoprop?

I can't find any mention of this at the Suzuki website.
The Suzuki duo prop is only available on the 350 Suzuki, it is dual contra-rotating props in one lower unit.
Outboard Specialties is offline  
Old 06-18-2019, 07:34 AM
  #9  
Junior Member
 
Join Date: Aug 2018
Posts: 21
Default

WOT is 6300 RPMs. I really haven't babied it, but I do live on a canal and I have to do only 5-6 mph for about 12-15 minutes until I get to the Lagoon, where I can open it up to a cruising speed. I make sure to drive between 35-45 while cruising and every once in a while to drive it WOT for 5-6mins 6300 RPMs @ around 54.5 mph. The boat mfg says I should be able to get to 57-58mph I've never been able to get anywhere near that.
dunc57 is offline  
Old 06-18-2019, 08:01 AM
  #10  
Senior MemberCaptains Club Member
 
Join Date: Nov 2002
Location: Melbourne Bch, FL
Posts: 632
Default

Originally Posted by dunc57 View Post
. The boat mfg says I should be able to get to 57-58mph I've never been able to get anywhere near that.
Is the motor hung too low? That would reduce your top end.
baldy is offline  
Old 06-18-2019, 08:05 AM
  #11  
Junior Member
 
Join Date: Aug 2018
Posts: 21
Default

Well I don't believe so? I have a 10" jack-plate and power trim.
dunc57 is offline  
Old 06-18-2019, 08:08 AM
  #12  
Admirals Club Admiral's Club Member
 
Join Date: Dec 2008
Location: Texas
Posts: 5,401
Default

Originally Posted by dunc57 View Post
WOT is 6300 RPMs. I really haven't babied it, but I do live on a canal and I have to do only 5-6 mph for about 12-15 minutes until I get to the Lagoon, where I can open it up to a cruising speed. I make sure to drive between 35-45 while cruising and every once in a while to drive it WOT for 5-6mins 6300 RPMs @ around 54.5 mph. The boat mfg says I should be able to get to 57-58mph I've never been able to get anywhere near that.
Drive it like you stole it to stop making oil.

Top end speed on a REC hull can be effected by many things. Water pick ups for live wells, transducers, tab not retracted all the way, bottom growth, bottom scaring, motor to low, etc... not saying these are any of your problems but there is a whole list of causes that can be parasites of top end speed and being within 2-3mph shy of what may be top end speed may not be the fault of the motor or prop. If you want top end speed need to look at everything that can cause drag, not just motor and prop.
Jeepman is offline  
Old 06-18-2019, 08:14 AM
  #13  
Junior Member
 
Join Date: Aug 2018
Posts: 21
Default

Makes sense. I love this boat and I thought this motor was the shit until I started having these issues.
The top end coming in a few mph short isn't a big deal for me. I mean we're only talking 3-4mph this boat rides great I've had it in 5-7' seas and it was very dry and hadled the chop better than expected.
dunc57 is offline  
Old 06-18-2019, 08:30 AM
  #14  
Senior MemberCaptains Club Member
THT sponsor
 
Outboard Specialties's Avatar
 
Join Date: Jan 2007
Location: Pompano Beach, FL
Posts: 1,964
Default

Originally Posted by dunc57 View Post
WOT is 6300 RPMs. I really haven't babied it, but I do live on a canal and I have to do only 5-6 mph for about 12-15 minutes until I get to the Lagoon, where I can open it up to a cruising speed. I make sure to drive between 35-45 while cruising and every once in a while to drive it WOT for 5-6mins 6300 RPMs @ around 54.5 mph. The boat mfg says I should be able to get to 57-58mph I've never been able to get anywhere near that.
Sounds like you are running it good, but I would say you are under propped actually. If you go with the next size up prop it will take you off of the 6300 which is max recommended and should give a little more speed to maybe hit those numbers the dealer said.
Are you running the suzuki oil? It is a semi-synthetic, not full synthetic.
Outboard Specialties is offline  
Old 06-18-2019, 09:23 AM
  #15  
Junior Member
 
Join Date: Aug 2018
Posts: 21
Default

On the bigger prop how do find out what size prop I need? And there are two do both have to be replaced? I've asked the dealer to order a new spare prop the biggest on, furthest aft and I'm going to send the one on there now to have a couple of dings repaired. It's really not a major concern for me to get a few extra mph's, but it sounds like you are recommending that I reduce the rpm's a little bit. This sounds like it might give a benefit to the OAL life of the engine with a side benefit of a couple of extra mph's.

As for the oil I've had the 20 hour break-in oil change done at the local dealer. And I'm assuming they have been using the Suzuki semi synthetic. I will have to follow up and ask.Just a question: why is semi synthetic better than full?
dunc57 is offline  
Old 06-18-2019, 11:10 AM
  #16  
Senior MemberCaptains Club Member
THT sponsor
 
Outboard Specialties's Avatar
 
Join Date: Jan 2007
Location: Pompano Beach, FL
Posts: 1,964
Default

You would need to change both props as they are a matched set as far as size goes. Look at your current props and directly on the side of them is the size, they go in 1.5" increments so you would go to the next one bigger by 1.5" pitch, diameter stays the same.

The bigger prop will bring the rpm's done some so you are not so close to the rev limiter, should give some more speed, and give better fuel efficiency. Its not a necessity since I don't think you're hitting the rev limiter but it would be helpful especially if you're getting a spare set of props anyway, just get the bigger ones.

The full synthetic just doesn't allow enough friction for proper break in, its actually to slick and will cause the rings/cylinders to glaze as well as let the pistons "float" from lack of ring movement.
dunc57 likes this.
Outboard Specialties is offline  
Old 06-18-2019, 12:23 PM
  #17  
Junior Member
 
Join Date: Aug 2018
Posts: 21
Default

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.
dunc57 is offline  
Old 06-18-2019, 12:33 PM
  #18  
Senior MemberCaptains Club Member
THT sponsor
 
Outboard Specialties's Avatar
 
Join Date: Jan 2007
Location: Pompano Beach, FL
Posts: 1,964
Default

If full synthetic was used its certainly not your fault if you didn't request it. The responsibility should lie on the dealer because they should know better. There may not be any permanent damage. I would discuss this with the dealer and possibly call suzuki customer service if the dealer does not want to help. More data and testing would need to be done to figure out whats going on exactly, this is all just opinions and ideas since I haven't personally seen the engine. A computer download will be able to tell different time frames at different rpm's, compression and leak down test should be performed to determine internal conditions as well as a camera in the cylinders to look at actual issues if any.
Not to throw your dealer under the bus but maybe a second opinion wouldn't hurt either. Where are you located?
Outboard Specialties is offline  
Old 06-18-2019, 12:47 PM
  #19  
Junior Member
 
Join Date: Aug 2018
Posts: 21
Default

I have call Suzuki customer service last week, because nothing had been done for the past couple of weeks. The shop (Abel Marine) was waiting to hear back from the Suzuki tech rep. They have the Suzuki Tech rep there both yesterday and today looking into my engine's problems. I'm just trying to get as much information as possible so that they don't try and clean out what little is left in my wallet. LOL.
I'm in SW Florida off 771 Placida/Port Charlotte border. The boat is at Abel Marine which I've heard and so far have experienced them to be very knowledgeable great service and a very good dealer.
dunc57 is offline  
Old 06-18-2019, 01:26 PM
  #20  
Senior MemberCaptains Club Member
THT sponsor
 
Outboard Specialties's Avatar
 
Join Date: Jan 2007
Location: Pompano Beach, FL
Posts: 1,964
Default

Ok, so something is happening then. I have heard of them but no personal experience with Abel. Let us know how it works out.
dunc57 likes this.
Outboard Specialties is offline  

Thread Tools
Search this Thread