Notices
The Boating Forum

32 donzi Hole shot problems

Old 09-11-2020, 05:20 PM
  #1  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default 32 donzi Hole shot problems

I just bought a 2001 donzi 32zf with twin 2007 225 Optis. The boat seems to have an issue with hole shot cavitation/ventilation. When getting on plane the rpms shoot to 4500 and stay there until the boat planes out (which takes about 20 seconds). The props are definitely losing too much bite on the hole shot. Props are bravo 1 22p 4 blades. There arent any pvs holes to play with. Motors are mounted one hole from the lowest setting. This just doesn't seem normal, any help would be greatly appreciated.
thanks
Old 09-11-2020, 05:37 PM
  #2  
Senior Member
 
Join Date: Aug 2020
Posts: 578
Received 342 Likes on 178 Posts
Default

Lower them to the lowest they can go.

Itís possible when someone repower they got shafts that are too short.
Old 09-11-2020, 05:42 PM
  #3  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by 69Mach390 View Post
Lower them to the lowest they can go.

Itís possible when someone repower they got shafts that are too short.
They are 25" shaft motors which is what I see on other donzis. I've heard it could be related to the stepped hull design of the boat but seeing as there are many boats running stepped hulls without this issue I'm going crazy trying to figure out how to at least minimize this. I will say that one prop has some minor damage to each of the blade edges (serrated like it hit something at some point) but doesn't seem like it would be enough to affect the performance that much.
Old 09-11-2020, 06:45 PM
  #4  
Admirals Club Admiral's Club Member
 
Join Date: Apr 2008
Location: Annapolis, MD
Posts: 960
Received 343 Likes on 183 Posts
Default

Originally Posted by Drifterfishing View Post
I just bought a 2001 donzi 32zf with twin 2007 225 Optis. The boat seems to have an issue with hole shot cavitation/ventilation. When getting on plane the rpms shoot to 4500 and stay there until the boat planes out (which takes about 20 seconds). The props are definitely losing too much bite on the hole shot. Props are bravo 1 22p 4 blades. There arent any pvs holes to play with. Motors are mounted one hole from the lowest setting. This just doesn't seem normal, any help would be greatly appreciated.
thanks
Was this problem apparent when you sea-trialed? What did the previous owner say about it then?
Old 09-11-2020, 06:54 PM
  #5  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by jfbetz View Post
Was this problem apparent when you sea-trialed? What did the previous owner say about it then?
Oddly enough it was minimal during sea trial however we were only in the intercoastal and it was slick calm, I did notice it however. We just eased up on plane at that time. It did it to the point that I noticed it but didn't think much of it. However offshore in a swell where we need a little more throttle to plane out it's very severe. I mentioned it in passing to the previous owner and he just said "yea it does that if you hammer the throttles". Again didn't think much of it as I'm pretty mechanically inclined when it comes to boats and just chocked it up to him not trimming the motors properly etc. But I've tried all different levels of trim and playing with the tabs with not much difference in the cavitation/ventilation. Once on plane it performs great.
Old 09-12-2020, 08:02 AM
  #6  
Admirals ClubCaptains Club Member Admiral's Club Member
 
Join Date: Dec 2003
Location: Fort Lauderdale, FL
Posts: 6,727
Likes: 0
Received 527 Likes on 312 Posts
Default

Common issue on that setup, the 35 is similar but not as bad as it has more setback. The best way is to convert to 30Ē shafts and move the engines up to the highest hole. You can try the Bravo FS, itíll pick up the bow a little and should bite better than the standard Bravo.
Old 09-12-2020, 08:14 AM
  #7  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by sundancekid View Post
Common issue on that setup, the 35 is similar but not as bad as it has more setback. The best way is to convert to 30Ē shafts and move the engines up to the highest hole. You can try the Bravo FS, itíll pick up the bow a little and should bite better than the standard Bravo.
Ive heard it mentioned before, just figured if it was that common there'd be more info out there about it. Converting to 30Ē shafts seems like an awfully expensive project. And wouldn't 30Ē shafts on the highest setting be pretty close to my current setup?
Old 09-12-2020, 08:26 AM
  #8  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2011
Posts: 601
Received 175 Likes on 79 Posts
Default

Sometimes itís just the props. Iíd contact someone that specializes in props and talk to them. Yours donít seem to have enough bite.
Old 09-12-2020, 08:34 AM
  #9  
Admirals Club Admiral's Club Member
 
Join Date: Mar 2002
Location: satellite beach, fla
Posts: 1,283
Received 97 Likes on 67 Posts
Default

Originally Posted by FlyingTexan View Post
Sometimes it’s just the props. I’d contact someone that specializes in props and talk to them. Yours don’t seem to have enough bite.
The Bravo IS the "go to " prop, or the FS. Listen to Joey.
Old 09-12-2020, 08:44 AM
  #10  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by satbeachbill View Post
The Bravo IS the "go to " prop, or the FS. Listen to Joey.
Thats what I thought. The bravo seems to be a pretty common prop on these boats. However, as mentioned before, my port side prop does have some minor damage to edge of each blade but it just doesn't seem like it would be near enough damage to cause this much of an issue.
Old 09-12-2020, 09:05 AM
  #11  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2015
Posts: 74
Received 13 Likes on 8 Posts
Default

I had the exact same problem on my 29 zf with the same motors. I actually lowered the motors one hole and that helped but it really hurt performance. I went to four blades, raised the motors back up and its been much, much better. I might've lost 2 mph tops from original. Worth the money.
Old 09-12-2020, 09:05 AM
  #12  
Admirals Club Admiral's Club Member
 
Join Date: Jan 2011
Posts: 601
Received 175 Likes on 79 Posts
Default

Originally Posted by satbeachbill View Post
The Bravo IS the "go to " prop, or the FS. Listen to Joey.
Doesnít mean there still isnít something wrong with his current props. The slightest of bend can ruin its bite. Regardless of whatever the ďgo toĒ is the fact remains that what he has currently isnít working. Lowering the engine might help but if the boat cruises fine and isnít blowing out at high power settings running across waves then donít see why it would on the hole shot where the steps donít really do anything and the engine is sitting itís deepest in the water.

To OP: You can drop your engine pretty easily by cranking the trailer jack all the way up, put some boards under the skegs, Loosen the bolts on the slider and pull the boats from the holes then crank the jack down so the back of the boat rises. Then once the holes are lined up put the bolts back in and tighten them down. Donít over torque the nuts though itís surprising how little you tighten them. Just put some thread lock on them. But you might be amazed how much you lose performance wise sticking your motors down deeper.


If you can go take a picture of the motors trimmed down to see how low they sit with the hull and also put a shot of the props on here. Also head to propgods and talk to Ken.

Last edited by FlyingTexan; 09-12-2020 at 09:12 AM.
Old 09-12-2020, 09:33 AM
  #13  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by ryamash1 View Post
I had the exact same problem on my 29 zf with the same motors. I actually lowered the motors one hole and that helped but it really hurt performance. I went to four blades, raised the motors back up and its been much, much better. I might've lost 2 mph tops from original. Worth the money.
I'm currently running the 4 blade bravos. Still not sure if it's a prop problem, hull design issue, or motor height issue.
Old 09-12-2020, 09:39 AM
  #14  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by FlyingTexan View Post
Doesnít mean there still isnít something wrong with his current props. The slightest of bend can ruin its bite. Regardless of whatever the ďgo toĒ is the fact remains that what he has currently isnít working. Lowering the engine might help but if the boat cruises fine and isnít blowing out at high power settings running across waves then donít see why it would on the hole shot where the steps donít really do anything and the engine is sitting itís deepest in the water.

To OP: You can drop your engine pretty easily by cranking the trailer jack all the way up, put some boards under the skegs, Loosen the bolts on the slider and pull the boats from the holes then crank the jack down so the back of the boat rises. Then once the holes are lined up put the bolts back in and tighten them down. Donít over torque the nuts though itís surprising how little you tighten them. Just put some thread lock on them. But you might be amazed how much you lose performance wise sticking your motors down deeper.


If you can go take a picture of the motors trimmed down to see how low they sit with the hull and also put a shot of the props on here. Also head to propgods and talk to Ken.
Removing the mounting bolt is easier said than done on this boat. There's no access through the transom or splash well to get to the nut. Have to go head first through the bilge hatch and try to crawl back to it without getting stuck lol. I like your idea about using the jack to lower the motors, I've used that method to get a boat off the trailer and onto blocks before. Never even thought about using it to reposition motors. I'll try to get a pic when I get back around the boat tomorrow afternoon.
Old 09-12-2020, 12:13 PM
  #15  
Senior MemberCaptains Club Member
 
Join Date: Sep 2002
Location: clinton, mississippi
Posts: 2,193
Likes: 0
Received 100 Likes on 48 Posts
Default

Common prob with that boat. I had same issues years back. Just ease into throttles. Only thing that seemed to work. They would blow out for a min then bite.
Old 09-12-2020, 12:18 PM
  #16  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by stumprunner View Post
Common prob with that boat. I had same issues years back. Just ease into throttles. Only thing that seemed to work. They would blow out for a min then bite.
That seems to be the best thing to do. Just trying to explore all avenues before I give up and just deal with it
Old 09-12-2020, 01:17 PM
  #17  
Admirals Club Admiral's Club Member
 
Join Date: Sep 2012
Posts: 198
Received 37 Likes on 21 Posts
Default

Had that boat back in the day with same setup. I remember vividly having the same issue. If you tried to throttle it too fast out of the hole they would cavitate, i think i would pull back a little till the engines re engaged again once the step hull got up and over. I remember i used to battle with that boat in the in between speed. It either liked to be on plane or not, if you were stuck in between its would be bow high and struggle. Once you got up and over it would ride great. I think i had the stock bravo props, i never changed them. I would double check the hubs too, but i would think if it was a hub slipping you wouldnt even get to the point of planing off
Old 09-12-2020, 01:25 PM
  #18  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by Turtlebull View Post
Had that boat back in the day with same setup. I remember vividly having the same issue. If you tried to throttle it too fast out of the hole they would cavitate, i think i would pull back a little till the engines re engaged again once the step hull got up and over. I remember i used to battle with that boat in the in between speed. It either liked to be on plane or not, if you were stuck in between its would be bow high and struggle. Once you got up and over it would ride great. I think i had the stock bravo props, i never changed them. I would double check the hubs too, but i would think if it was a hub slipping you wouldnt even get to the point of planing off
Thats my issue to a T. It really doesn't like to go under 30mph. I'm pretty confident it's not a hub because as you mentioned it probably wouldn't plane out at all. The more I read the more I think it's a product of the hull design and the props sitting right in all that turbulent water during the hole shot. I may try to drop the motors to the lowest mounting hole and see how that affects it and hopefully it doesn't affect the performance too bad. I don't care all that much about top end speed ( can't run 50+ often offshore anyway) but I don't want to lose the great fuel economy these Optis have. I might also try changing props, just hate to drop $1200 if that's not going to help anything.
Old 09-12-2020, 02:19 PM
  #19  
Admirals Club Admiral's Club Member
 
Join Date: Sep 2012
Posts: 198
Received 37 Likes on 21 Posts
Default

Originally Posted by Drifterfishing View Post
Thats my issue to a T. It really doesn't like to go under 30mph. I'm pretty confident it's not a hub because as you mentioned it probably wouldn't plane out at all. The more I read the more I think it's a product of the hull design and the props sitting right in all that turbulent water during the hole shot. I may try to drop the motors to the lowest mounting hole and see how that affects it and hopefully it doesn't affect the performance too bad. I don't care all that much about top end speed ( can't run 50+ often offshore anyway) but I don't want to lose the great fuel economy these Optis have. I might also try changing props, just hate to drop $1200 if that's not going to help anything.
So , i was just thinking as it has been so many years ago. I remember talking to another owner one time and he did play around with the mounting of the engines. Like someone else has stated. If I'm correct i remember he dropped them one slot. Another thing as this issue is common with that step hull. I think you should do some more research with the props. I don't remember what props i had but i think if you talk to a good prop guy he can definitely minimize the slippage you are getting. I don't know what the bravos are geared for (top end or holeshot) Are your top end rpms in line? you should start there. Theres so many prop choices now and just a little tweak on pitch and model can maybe get it right but might not ever be perfect as some hull like this produce ventilation
Old 09-12-2020, 02:26 PM
  #20  
Admirals Club Admiral's Club Member
Thread Starter
 
Join Date: Sep 2020
Location: Jacksonville fl
Posts: 31
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by Turtlebull View Post
So , i was just thinking as it has been so many years ago. I remember talking to another owner one time and he did play around with the mounting of the engines. Like someone else has stated. If I'm correct i remember he dropped them one slot. Another thing as this issue is common with that step hull. I think you should do some more research with the props. I don't remember what props i had but i think if you talk to a good prop guy he can definitely minimize the slippage you are getting. I don't know what the bravos are geared for (top end or holeshot) Are your top end rpms in line? you should start there. Theres so many prop choices now and just a little tweak on pitch and model can maybe get it right but might not ever be perfect as some hull like this produce ventilation
I can deal with it not being perfect but I would definitely like it to be much better than it currently is. I just wish I could find a few props to test before I drop the money on new ones. And mounting height is definitely on the list of things to try, especially since that doesn't cost anything, just a little time and elbow grease. I just see too many other donzis running the same setup without having these issues (at least not that I know of) I'm thinking there has to be a way to correct it.

Thread Tools
Search this Thread

Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service - Do Not Sell My Personal Information -

Copyright © 2018 MH Sub I, LLC dba Internet Brands. All rights reserved. Use of this site indicates your consent to the Terms of Use.