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Old 03 August 2013, 15:38   #31
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I could be way off here but..., is that a long shaft motor on a short transom ?, as the picture with the level and the tape suggests 5" difference.
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Old 03 August 2013, 15:58   #32
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The cav plate is 3 inches below bottom of transom, not 5. Top of level , not bottom, is even with cav plate.

Zodiac WB465 calls for long shaft engine (confirmed by manufacturer), which this engine is. It measures 20 inches from cav plate to transom rest stop and model number matches for long shaft engine.
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Old 03 August 2013, 20:23   #33
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Not sure what the motor height should be as I have never reset mine from the way whomever originally bought and set up the boat. It seems to do okay. Any comments would be welcome as I am open to ideas, but thought I would share another perspective.

The cavitation plate is the lower one with the Stingray plastic wing shown in the lower right of the photo.


Trim is set to all the way down (I usually tilt it up just a little if not loaded heavily with dive gear). There is about 1cm of clearance to the bottom of the boat, as the yellow level is resting on the "bottom" of the cavitation plate.


Projectile, could you please share some photos of your elephant trunk setup both inside and outside? I would really appreciate it.
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Old 03 August 2013, 22:25   #34
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Happy to but what's an elephant trunk?
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Old 03 August 2013, 23:35   #35
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Quote:
Originally Posted by Projectile View Post
Happy to but what's an elephant trunk?

Like this one, but mines got girth....

Cheers, Squid
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Old 04 August 2013, 04:10   #36
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Ahhhh ... The high volume self bailer.


Sure, but I'll have to take some photos first. Give me a few days.
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Old 06 August 2013, 01:26   #37
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Here ya go.
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Old 06 August 2013, 01:28   #38
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Thanks, Peter_C, for posting the pics of your cav plate. Mine is way lower, and so yours help lend support for the advice to try to raise my outboard. I hope that sorts my issues out.
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Old 10 August 2013, 20:19   #39
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I just looked at Troy's pics carefully. Not only does the problem he described with his boat match the problem I am having with mine, his cav plate looks to be at least 3 inches below the transom, just like mine.

I have a feeling that raising my engine is going to be the solution.

My transom is 19 inches high, and my ETEC 30 has a 22 inch shaft (not 20 as I wrote above ... that was a poor estimate ... when I measured it properly today, it was 22 inches long). Not a very good match...

The trouble is that I can only raise my engine about an inch before the twisty clamps that secure the motor to the mounting plate on the transom will sit above that mounting plate, so I hope that 1 inch is enough to solve the problem. I may have to bolt this engine to the transom after all. Unfortunately, I was hoping to avoid that.

I wish I'd hear back from Troy with some reassurance that raising his engine also solved his problem...
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Old 11 August 2013, 01:33   #40
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Great post locozodiac. Couple comments to add, the relevant inflation pressure is not what comes out of the pump at the launch site but what is in the tubes on the water (earlier this week the ambient temp was 37 degrees, the glacier fed lake was just a little colder).

Here is a helpful article with some depth (ha ha) on cav plate / motor height, personally just cut some 1/2 strips of ply and experimented much in the way locozodiac described (cavitation during 'normal' running and too high).

http://media.channelblade.com/boat_g...tipstricks.pdf (sorry, no idea how to that in fancy manner in phone).

Good luck.
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