Honwave t38ie3 engine height

[Gremdavies]

Hello chaps. Got a honwave t38 ie3. New January this year. And a 1 year old tohatsu m15d2. I had to lift the transom 25mm on my last sib to reduce spray with a custom made ally riser I had machined at work.

I had spray originally that filled the boat with the honwave on my first outing. So I have fitted my old riser to the honwave. Spray is a bit better and vent plate sits pretty much skimming the water now on trim pin 2 on the plane.

Only downside with the boat is if I don't sit both adults at the back at speed the side of the sponsons in line with the front seats digs in and forces a large splash of water sideways outwards from the front of the boat. My mate is a few stone heavier than me who comes out with me. I also cannot run in shallow water drive now which I used to as the vent plate that has the water pickup on the bottom is only just in the water and had the telltale spitting when I tried it for a second or two. So didn't want to risk running it without cooling! At slower speed it also sounds a bit gurgly from the prop. At half to 3/4 speed it runs absolutely perfect 2 up at about 20mph. Had us flying through a rough sea yesterday perfectly.

Is the lack of shallow water drive just a compromise I need to make to get the height right?

Have I raised the engine too high?

Or am I over thinking it and just send it?

[chipko]

Nice rig you have there [emoji106]

TBH everything’s a bit of a compromise on a sib. You may be running a tad high but if the only negative is on shallow drive then so be it. If that’s important then perhaps worth trying a 15 and 20mm spacer as a compromise.

For info our T38 IE2/Mariner 20 combo (same motor and lower leg as Tohatsu) ran fine with minimal spray sat straight on transom with no packers. Initially a bit of intermittent ventilation running on ideal trim setting 3 cured by trimming in to pin 2. Eventually put to bed for good by over pressuring floor to 1 bar with no ventilation in all sea states even running on trim pin 3.

[Steve509926]

Knowing absolutely nothing about Honwaves, my thoughts aftet reading your post was packers too high and pressure in the floor and sponsons a bit too low.
Like Chipko I run my SD360 pressure in sponsons and keel a bit higher than recommended and found it cured a multitude of problems, especially when two up with a dog and kit.

[smallribber]

Here we go again.... It is like a dance that never ends

[Steve509926]

Originally Posted by Easedalenovice

Here we go again.... It is like a dance that never ends

That's unlike you to make a comment like that, what's the matter Dennis, is your dance card full

[Gremdavies]

Thanks for the reply mate. I think I'm going to have to give it another blast and make a decision on what to do and try. Maybe try shifting some weight around and try a tiller extender to see where the weight needs to be.

Main issue I have with changing the packer is what I've made is a solid aluminium plate that I've bolted and sealed. So it's a bit of a job getting it off to be honest and then I need to machine the amount off the material at the top. So adjusting it isn't quite a easy job. Bit of a chew. Least it looks professional though! I was the same trim pin 3 seemed perfect but gurgled badly and trim 2 seemed perfect but the rooster spray filled the boat with water. Was incredibly frustrating. Trying to gather as much knowledge from others that have had the same issue to put together a plan to fix it as much as I can.

Thanks a lot for your comment mate. Appreciate it.

[Gremdavies]

Originally Posted by Easedalenovice

Here we go again.... It is like a dance that never ends

Any helpful advice? Pretty please ha ha

[Gremdavies]

Originally Posted by chipko

Nice rig you have there [emoji106]

TBH everything’s a bit of a compromise on a sib. You may be running a tad high but if the only negative is on shallow drive then so be it. If that’s important then perhaps worth trying a 15 and 20mm spacer as a compromise.

For info our T38 IE2/Mariner 20 combo (same motor and lower leg as Tohatsu) ran fine with minimal spray sat straight on transom with no packers. Initially a bit of intermittent ventilation running on ideal trim setting 3 cured by trimming in to pin 2. Eventually put to bed for good by over pressuring floor to 1 bar with no ventilation in all sea states even running on trim pin 3.


Attachment 142817


Attachment 142818

Thanks for the reply mate. I think I'm going to have to give it another blast and make a decision on what to do and try. Maybe try shifting some weight around and try a tiller extender to see where the weight needs to be.

Main issue I have with changing the packer is what I've made is a solid aluminium plate that I've bolted and sealed. So it's a bit of a job getting it off to be honest and then I need to machine the amount off the material at the top. So adjusting it isn't quite a easy job. Bit of a chew. Least it looks professional though! I was the same trim pin 3 seemed perfect but gurgled badly and trim 2 seemed perfect but the rooster spray filled the boat with water. Was incredibly frustrating. Trying to gather as much knowledge from others that have had the same issue to put together a plan to fix it as much as I can.

Thanks a lot for your comment mate. Appreciate it.

[smallribber]

Originally Posted by Gremdavies

Any helpful advice? Pretty please ha ha

Is your engine long or short shaft.

The main advice I would give is don’t do anything permanent of fixed too well to the transom. Honwave have generally got things right.

Shift weight about in the boat.
Fiddle a little with the pin position on the motor
Make sure the tubes and floor are at the correct pressure

In the end a little splash is offten simply what happens
Enjoy your boat

[smallribber]

Reading you post again you say you have two people sitting at the back. This will never work well in a sib.

[Gremdavies]

Originally Posted by Easedalenovice

Reading you post again you say you have two people sitting at the back. This will never work well in a sib.

The only way it will plane is if we both sit at the back. Full chat and one leans forward a touch to get it over the hump then sits back. If one sits forward then the boat digs in on the tubes level with the front seat and won't go full chat. Causes too much drag

[Gremdavies]

Originally Posted by Easedalenovice

Is your engine long or short shaft.

The main advice I would give is don’t do anything permanent of fixed too well to the transom. Honwave have generally got things right.

Shift weight about in the boat.
Fiddle a little with the pin position on the motor
Make sure the tubes and floor are at the correct pressure

In the end a little splash is offten simply what happens
Enjoy your boat

Short shaft mate. Yeah I did expect a little splash. Main reason for the lift was after the first trip I had a good few litres in the bottom of the boat. Which with the high design of the bung wouldn't drain off without the boat being full. I did originally start with a 10mm packer. Which I felt wasn't enough but did help the splash. May be just that 25mm is too far. Think I'm going to take 10mm off the one I've made and try that. It has two tapped holes in the top so I can bolt on a packer if I need to lift it back up a touch anyway. Just want to make sure this is what it is before I go modifying again. There's Deffo something not right. I just don't know for sure what it is.

My last sib the riser sorted it pretty much completely. I have attached a screenshot of the back of the boat. Won't let me upload a proper photo due to file size.

[Steve509926]

Originally Posted by Gremdavies

The only way it will plane is if we both sit at the back. Full chat and one leans forward a touch to get it over the hump then sits back. If one sits forward then the boat digs in on the tubes level with the front seat and won't go full chat. Causes too much drag

That just sounds so wrong. Are you sure your pressures are right, the weight is distributed evenly, trim hole 2, maybe 3 on your OB?

As an aside, would it not be better to establish what height any packer should be, maybe using wooden blocks, before you go to the trouble and expense of machining an ali packer?

[Gremdavies]

Originally Posted by Steve509926

That just sounds so wrong. Are you sure your pressures are right, the weight is distributed evenly, trim hole 2, maybe 3 on your OB?

As an aside, would it not be better to establish what height any packer should be, maybe using wooden blocks, before you go to the trouble and expense of machining an ali packer?

Yeah I did with ally flat bar before I went and fitted my old riser. Tried 5, 10, 15 and 20. 15-20 was OK but looked like it could do with a touch more so I just fitted the 25 riser plate.

Trim pin 2 mate. 3 sucks in a load of air. To be fair it sounded the same when I tried trim 3 without the riser with the o/b just sitting on the transom.

I know. My last sib was the same. Two adults at the back no problem at all.

[Steve509926]

You keep mentioning your last sib, what was it?

[Gremdavies]

Originally Posted by Steve509926

You keep mentioning your last sib, what was it?

Just one of the cheap Costco tobin sports mirovia 3.3m

Was fine with a 6hp but when I upgraded to a 15 the floor Turned into the most horrific Mexican wave. Did 25mph but felt unsafe. Floor psi was designed for 5psi so was only low pressure and tbh couldn't handle the speed. Was rated for. 15 though!

[Steve509926]

You are comparing apples and oranges between your last sib and your new honwave, so you really need to think afresh.
Purely basic stuff, but what are you using to inflate your new honwave and how are you measuring the pressure?

[Gremdavies]

Originally Posted by Steve509926

You are comparing apples and oranges between your last sib and your new honwave, so you really need to think afresh.
Purely basic stuff, but what are you using to inflate your new honwave and how are you measuring the pressure?

Yeah mate true.

Using a servlor 12v high pressure pump. Setting it to 12 psi as floor is 11. 6. Then confirming with the honwave pressure gauge I got with the boat. Doing same for all tubes and floor.

[Steve509926]

Are you checking the pressures after 10 - 15 mins? and topping up when necessary?

[Gremdavies]

Originally Posted by Steve509926

Are you checking the pressures after 10 - 15 mins? and topping up when necessary?

I did the first time I tried the riser. I haven't since though as didn't make any difference and pumping the floor up on the boat with the footpump on the water is not an easy task.

My elec pump for whatever reason won't power off my 7ah battery box. I've upgraded the battery to a 12ah for other reasons and will be buying a new pump today that will 100% work off the battery box to top up when on the water. I do suspect it won't make much of a difference to my problem. The only issue I get if I don't top up is a slight flex in the floor. And it really is only slight. It may make a difference to where the second adult sits though so good idea on that mate. Will make more effort to pump it up on the water when I get the new pump tomorrow.