'Plume' of water from engine

[tweeds]

I've got a Suzuki dt25 on the back of a Porter's 4.5m rib, with anti-cavitation hydrofoil fitted.

I get a noticeable plume of water off the back of the engine, even at relatively low speeds.

The engine is trimmed all the way in.

Any hints on what could cause this and what I can try to fix it?

[beerbelly]

is the cavitation plate level with the keel line mine was an inch and a half low and it caused a big roostertail

[tweeds]

Please excuse my ignorance; what do you mean by keel line?

[beamishken]

Maybe a picture taken with the camera at the level of the bottom of the boat showing the relationship between engine and Hull would help identify the problem

[jeffstevens763@g]

trimed in too far try two holes out.

[chipko]

Originally Posted by tweeds

Please excuse my ignorance; what do you mean by keel line?

Something like this where av plate is in line/level with the bottom of the transom in the centre i.e. keel line extended out rearwards to outboard leg.


As Jeff said, probably just trimmed in too far. Quick fix.

[tweeds]

Hopefully some pictures below.....

[tweeds]

Looking now, I realise that from the angle I took the photo it doesn't really help, but hopefully the second one does.

[jeffstevens763@g]

Originally Posted by tweeds

Looking now, I realise that from the angle I took the photo it doesn't really help, but hopefully the second one does.

Engine looks about 1.5-2 inch too low I think

[redrubber xl]

Originally Posted by jeffstevens763@g

Engine looks about 1.5-2 inch too low I think

I agree

[jambo]

Originally Posted by jeffstevens763@g

Engine looks about 1.5-2 inch too low I think

I agree with you Jeff[emoji106]

[tweeds]

Thanks.

I'll see if trimming it out also raises it a bit first. Physically raising the engine could be a bit of a job (even just getting the old bolts off).

[tweeds]

Trimmed it out 2 holes as Jeff suggested, and its much better.

I'll look at raising it in the future, but I'm happy enough with the improvement to focus on everything else that needs sorting for now.

[jeffstevens763@g]

Originally Posted by tweeds

Trimmed it out 2 holes as Jeff suggested, and its much better.

I'll look at raising it in the future, but I'm happy enough with the improvement to focus on everything else that needs sorting for now.

[9D280]

Originally Posted by tweeds

Trimmed it out 2 holes as Jeff suggested, and its much better.

I'll look at raising it in the future, but I'm happy enough with the improvement to focus on everything else that needs sorting for now.

Bit late here, but next time you are out (I assume you don't have power trim on that) I had my old DT25 on the second last pin for cruising, and dropped it in for when I was doing rescue boat or if the cruise was in particularly lumpy waves.


Just keep moving the pin out until it starts to let go with monotonous regularity, then drop it back one. :Thumbs:


Not sure of your transom geometry, but I had an SR4, FWIW.