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Author Topic:   Raise engine 1 hole or 2?
kamie posted 05-27-2004 08:39 PM ET (US)   Profile for kamie   Send Email to kamie  
I have the engine bolts loose and I am ready to raise the engine. I also have a vensura offshore prop to put on her hopefully tomorrow after I get the engine bolted back on the transom. With that info, should I raise the engine one bolt hole or two to start. I took a couple photo's of where the engine sits now in relation to the transom. Thanks for any help

Sal DiMercurio posted 05-27-2004 09:33 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
2 holes.
Plotman posted 05-27-2004 09:49 PM ET (US)     Profile for Plotman  Send Email to Plotman     
Really can't tell from the pictures - it looks like you are using a level to compare the cav plate to the transom - it needs to be used as a straightedge coming off of the bottom of the boat - "level" doesn't matter unless the boat sits perfectly level while on the trailer.

You should try both one and two holes, take seveal readings at each, and then decide which is better. If two holes wins, then repeat with the third hole etc, until you have gone one hole too far and then move it back down.


kamie posted 05-27-2004 10:15 PM ET (US)     Profile for kamie  Send Email to kamie     
I only used a level because it was handy, shorter and easier to handle than an 8 foot 2X4. The boat is not level on the trailer, actually it's not even centered on the trailer (a whole other story).
elaelap posted 05-28-2004 10:36 AM ET (US)     Profile for elaelap  Send Email to elaelap     

I've just spent the last half hour going through your photo album. Congratulations for the work you've done...I envy you for your skill and perserverance. The transformation of Thumper into Evenstar sets a high standard for the rest of us.


kamie posted 05-28-2004 01:11 PM ET (US)     Profile for kamie  Send Email to kamie     
Thanks for the kind words Tony. There are a lot of times when the engine isn't bolted to the transom and the boat isn't straight on the trailer or I think of the list of things left to do it gets a bit overwhelming. I sometimes go over to the post classics just to see how a turnkey boating experience is. I figured out though I would be tweaking a new boat almost as much, just different things.

Since i got the boat I have been slack about the rest of my website, but checkout the pictures of Afica or New Brunswick.

I am off to get grease so I can hopefully take the prop off and put the new one back on.

Peter posted 05-28-2004 01:34 PM ET (US)     Profile for Peter  Send Email to Peter     
Kamie, half the fun of the boat is the sense of accomplishment you get from doing the tweaking to get it the way you want!

I wouldn't go more than two holes up as Sal recommends. As your motor height goes up, rough sea performance goes down.

kamie posted 05-28-2004 02:13 PM ET (US)     Profile for kamie  Send Email to kamie     
I managed to get the old prop off, and find the number.
49 78120 A40l 19p

Anyone know what I have?

kamie posted 05-28-2004 02:24 PM ET (US)     Profile for kamie  Send Email to kamie     
I found it. Finally sorted out the numbers.
Black Max Propeller

The part: 48-78120A40 has been substituted with: 48-832830A45

Is the theory still that I raise the engine 2 holes and plop on the nice Vensura?

kamie posted 05-29-2004 12:24 AM ET (US)     Profile for kamie  Send Email to kamie     
The motor is up 2 holes and the SS vensura prop is on. Will report tomorrow on how she did.
kamie posted 06-01-2004 03:55 PM ET (US)     Profile for kamie  Send Email to kamie     
Well, Taking it up 2 holes was less than totally successful. Even trimmed all the way in, she was blowing out in the bay on Saturday. Going to drop her one hole and see how that works.
Sal DiMercurio posted 06-01-2004 05:00 PM ET (US)     Profile for Sal DiMercurio  Send Email to Sal DiMercurio     
If your running a stock oem prop, it will blow out.
Before you drop the engine back down, beg borrow or steal a performance prop such as a s/s stiletto or raptor or even a performance prop thats made by your engine maker.
kamie posted 06-01-2004 05:05 PM ET (US)     Profile for kamie  Send Email to kamie     
I was running a 4 bladed vensura offshore Mercury prop.

It could have been the 3~4 foot+ waves

rtk posted 06-01-2004 05:57 PM ET (US)     Profile for rtk  Send Email to rtk     
Kamie, even though we do not have the same boat, mine will not perform well either with the motor mounted on the middle holes (five holes total I believe). At this mounting level with that Vensura prop on the only way it would perform without ventilating is a full load of fuel and calm water. Once it gets choppy it just ventilates like crazy. From the Vensura I went to a four blade stainless prop from Powertech that has I believe a 15.5 inch diameter, similar to the three blade Mirage diameter. (one inch more than the Vensura) It is better, but not much. I am going to drop my motor down this week, just waiting to hear from the dealer because I want to be there to see how the anti ventilation plate is lined up with the bottom.

Sounds like you are up too high to me. Sorry to hear you couldn't get the boat to Chestertown. Sounds like you had a good time anyway.


kamie posted 06-01-2004 06:19 PM ET (US)     Profile for kamie  Send Email to kamie     

Thanks for the info. I just went out and re-measured and the cavitation plate is 1 5/8 inches above the keel. Going to drop it down one set of holes tomorrow and drop her in the water on Sunday. I am a firm believer that things work out and it worked out not to cross the bay except by the land route. Had we been riding in anything but the 320 my partner would probably be in bed on heavy pain killers.

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