f_inscreenname
Commander
- Joined
- Aug 23, 2001
- Messages
- 2,591
I didnt want to call you out by name but you all know who you are and thanks ahead of time. <br />Here is the deal. As most will know I was having a trim tab issue. Even though I never use them and they were install correctly they still were active all the time. Even causing the tab plains to become hooked. After much debate and a couple emails to the Tabman we came to the conclusion that the tabs were to big (instead of 18 I needed 12) and I needed new cylinders that will allow for another 1 of lift to pull the tab higher out of the water. So I take everything off the transom and send it back to Bennett (the best company in the world by the way) for a free exchange. I do this on Wednesday and of course there is no way they will be back before the week end so I seal everything up and on Saturday I take the boat out for a ride. <br />I ran a couple test and now I am not sure what to do. <br />Test I<br />I started from the boat ramp with everything in the same place that it was on my last trip except the rams and the tabs are taken off. One thing I noticed right away. The boat backed up much faster then it usually would. Just in gear it moved twice as fast as it did before. I can live with that. Then I preceded to burn off a ¼ tank of gas putting it through its paces. My conclusion was that there was not much difference then before. To use a couple Nascar terms. It was a little loose in the *** end, I guess the tabs dig in when you go into a turn. And the bow didnt push (plow) as bad. She seemed to be a little more on top of the water. My top end didnt change and there was very little difference where the rpm/mph was before. It was a little windy and choppy out so all and all it was about the same. Also the transom area seem to be kicking up more spray then usual. I guess the tabs blocked that before. <br />WOT = 4700rpm / 61mph<br />Test II<br />The only thing I did different this time was move the trim pin out one hole. Before I tried this and the prop would cavatate real bad at all rpms. With no hope of this working I saved it to last and almost didnt do it. This time I go to take off and the bow comes up a lot. I am thinking this is good but it did this the last time and when it got on a plain it would break loose. Over it goes and it just keeps on going. I start gassing it and it stays hooked up. Around 32 to 3600 rpms it feel a little loose and I am ready for to go nuts but it doesnt so then I start to fire wall it and it stays hooked up. Now the boat is going faster then it ever has before on this prop by 7mph (well that is what the speedometer said but I have never seen it wrap around that far) It felt more like 10+mph. <br />I figure the reason it felt soft between 32 to 3600rpms is because the transom came up a little. Those rpms are the flat cruising speeds. So the bow would want to sink a little because the thrust at the transom is not enough to keep it up and push down the transom far enough to keep it hooked up. Normally this is where you would trim down the outdrive a little for cruising and would move it up higher for top end. But I do not have that option at the moment. There is no way I can leave 10 mph on the table and on top of that my speeds were much faster for the same rpms I was running before. IE, Position 1; Around 4000rpms I would be running around 50mph. Position 2 When I was doing 4000rpms I was going 60mph. <br /> I need trim, BAD!! <br />I start the hunt for the elusive Volvo T drives once again (I have been looking off and on for 5 years) and just by dumb luck I find this on eBay that night and buy it. <br />
<br />So now it is mine I am not sure how to go about making it work. They guy I out bid got the matching trim pump. Do I have to use a Volvo trim pump or can I use a Merc Pump or something else? Is there anything special about hooking this up? Special hydraulic line, splitters for the lines, etc, etc? Is there any difference in the Volvo 270 transom shield and the 280 T shield (bigger, smaller cut out, do the bolt holes line up)? Put it this way I have a Volvo 270 now and I have never seen in person a T model but I plan on installing the new shield on my boat. What do I do? <br />Thanks <br />Mark
