292 coming up on plane?
 

Right about the time my bow drops over i get what I would call prop chatter. But a slight vibration, last about 5 seconds.

You guys have this?

LC

Possible loose motor mounts on one or both engines?

Not trying to Captain Obvious here but did you check the prop nuts and tabs?

fixx
 

loose or bend prop shaft or blade..

No, I don't and have never seen that. This is going to be hard to figure out over the internet. Its odd that it does it as the boat levels off not when its under full load coming out of the water. How are your gimbal bearings? coupler maybe its slipping while coming out of the water then when load on it is reduced it vibrates as it locks up.

If when it starts, if you back off the throttles a little to hold that angle/ position will the vibration last longer ?

Just bought boat. So I haven't had drives off to check g.b.s or cupler splines. Props are tight, tabs are tight. No other vibrations present, boat runs like a dream. Motor mounts look tight, haven't put a wrench to them. I thought it maybe the st under the swim step, or the boarding ladder cover. I guess next time out I will load each motor up in forward to verify it's not a coupler. Only 140 hrs so I hope it's nothing serious. Sure would hate to have to pull a motor this winter, did that last year on my other boat.

Any way to check prop shaft wo having to take apart drive? Props spin freely wo contacting housing while on trailer..

I have a video of me planing out, You ca hear what I think is the root cause to the vib....

Post it that will help. Are you sure it not just your props blowing out? 292s will do this.

May be blow out, I have not exp it before. Only other twins i have driven are sportsfisherman or outboard fishing boats. I might not be driving it correctly, only 2 hours under my ownership and 2 hours during sea trial. I am uploading vid now but audio is not what I thought it would be. and its just before bow dropping, while under load looking back, so coupler may be a real possibility. Kinda sounds like splines but rpm's are solid so who knows. Lets hope for blow out, lol.

LC

292s like to come on plane a certain way. Tabs all the way down, as the bow starts to level off start bringing the tabs up then trim to neutral. which is when the drive is verticail withe the imaginary line from the bottom of the first step to the transom. Use a string and check on the trailer so you know where it is on the gauge. It could be anything could also be a u-joint thats not a lot of hours for an 03.



Here is a video of mine coming on plane at about 30 sec.





http://www.youtube.com/user/fertilit...43/liVGPDXolco

I used to get a little bit of prop slip coming on plane when I first got my 292. Boat would shake a little coming out of the whole. Chalked it up to inexperience and not knowing the boat. I realized that I was getting on the throttles to hard at first. After more seat time, you learn what the boat likes and wants to do. Can't go hammer down right away, not recommended and the boat just doesn't like it. I just have to ease her up on plane. Incremental adjustments. I don't pass 3/4 throttle before backing her back down to crusing speed.

Like expensive said, tabs down drives down, as the bow drops, pull tabs up and trim up to neutral.

It's a fun boat. Just spend some time playing around with her. Just like any girl, you'll figure out what she likes eventually... just in time to go out and find a new one!

Vibration Coming On Plane
 

You might not have a mechanical problem at all. I have an '05 353 and if I come up on plane a certain way, (slowly rolling up on plane), there is a certain point where I get a fair amount of vibration if I hold that position too long. I was out with a pretty knowledgeable dealer rep who said this was caused by the angle of the bottom of the boat to the surface of the water. I'm not sure exactly what he meant, but I do know I have to be planing exactly the same way for it to happen; otherwise, it doesn't happen at all.

Several years ago I test drove a 292 that did the same thing but only at a specific angle to the water surface for a very brief period.

I'm not sure if it is inherent in the hull design but it's something to think about before you go tearing into your power train looking for a mechanical problem.










:coolcowboy:

well video didnt upload over the night, working on it again. I honestly dont think its drive train, boat runs too dam smooth in all other conditions. I really just need more seat time, trying tabs all the way down drives nuetral, ect. when coming onto plane.

If you were not putting the tabs down while going on plane and the drives all the way in,I think you just found your problem.

Post the video on You-Tube much easier.

I bet your right, tabs havent been full down , nor have drives been full in. I will do somemore testing.

youtube is crazy slow lately. I will keep trying, but just looking over the video, i see bow straight up pretty much indicating the above.

congrat's post some pics of the boat!

I agree with Bad Bird. My 353 does the same thing. Also, try runnng the boat out of the water and in gear. If something is not right, any vibration will be more noticeable without a load on the drive.

our 292 experiences the same vibration upon takeoff...i have attributed it to prop slip. as soon as we are on plane, vibration is gone. we can actually feel the props trying to grab. if you take off much more gradual (slowww) and are easy on the throttle, you will notice the vibration nearly disappears. thats our experience anyways. i dont think its anything mechanical.

I have a 1991 292 with 502 26B1 and as long as i have had the boat it has always done that same thing.Just adjust your throttle to work around it.It is the prop cavitating.If you continue you will notice some pitting on the back side of the prop.Steam burning the metal.....HOPE THIS HELPS.

Make sure the "celery sticks" at the back of the drives/trim rams are in front of the mounting shafts. This will allow the drives to trim all the way in.

Video won't upload. Could it be from st under platform? While running on the hose to winterize I kept hearing a noise like a baffle was loose or something. I could see that under the right circumstance this would rattle the boat giving a vibration...

If you have the same setup as me with the pinwheel baffles in the exhaust tips its very possible that one has broke the welds and come loose. It happened to me and it was so loud I thought I lost a motor. There are two, an inner and outer.You can feel the outside ones from under the transom,but more than likely its the inner. Remove the exhaust hose going to the tip if its loose you can just pull it out. You don't need them I took all of mine out.

You talking silent thunder or muffler tip? I have the silent thunder water muffler box. May take it off and use an external muffler.

I was talking tips,forgot about the older style don't know much about those boxes but it could be a problem.

Thanks for all the input...

I think you have two issues here that aren't really problems...they are nuiances of the 292. I believe you are simply blowing out your props when coming on plane. Formula props the boat for mid-upper range, not for coming on plane. They tend to struggle with factory supplied props. Most people back down a prop size for quicker planning, but mine still blows out a little coming up. the recommendation to flip the drive spacer around will allow the drive to tuck in tighter and should aid in lifting the transom to plane. I'm doing this next spring. Second, the vibration/rattle sound was the ladder cover rattling on my swim platform. Take a look at the edges inside the cover and see if there are rub marks. Throw a towel in and close the lid...rattle gone? I had to rubber edge the cover on mine and solved the problem. Yes, EVERYONE at the marina could hear it and thought there was a mechanical problem...just little quirks that need to be attended to. Love my 292!

Hey. PONDRUNNER I see you have 377s. I have a 2002 with 377s ,what size prop are you using ? I went with 28s and it seems to plane off alot better and still getting 74 mph on GPS.

I am running 26" non labbed bravos. I can hit the limiters.
68 mph in fresh water. Swim ladder lid was another thought, just have not isolated it yet.

Thanks,

You could add some prop tip cup to your 26's to bring rpms down and help with the blowout planning off. Or you could swing labbed 28's, but thats an expensive option. Boz, My boat with 377 scorpions came from the factory with labbed 30" bravo props. The original owner swapped them to stock 28 bravos to plane off better and it does. Top speed loss was about 2-3mph. I'm hitting 75+ on gps consistently with the 28's and will get a set of labbed 30's as a spare set and to get back that little bit of top end for poker running. Also thinking about adding CMI exhaust to pickup 30 hp and 39 ft/lbs of torque per motor over the winter. I'll drop the silent thunder as well. I might. might see 80gps when all is said and done.

Three things coming to mind with your rattle.

1) As mentioned, Swim Ladder Lid. Vibrates like a B****. After I removed the silent thunder box, most of the vibrations went away.

2) The silent thunder box. Check the 4 bolts that hold the box in place. I had one that worked it's way loose and the box was vibrating against the under side of the swim platform. Again, removed the box noise went away.

3) Captains Call - not sure if you have this option on your 292 but when I flush my engines from the quick connect on the exhaust riser there's a tap/rattle in the engine compartment. I thought I had a valve tapping at first, but I traced it to the captains call. If I place my hand on the actuator where the internal flapper is the rattle goes away. Only hear it when the compartment is open.

Just repower over the winter, then if the noise is still there you know its the ladder.:party-smiley-004:

A very real possibility, in a no wake zone above 1000 rpms I have a vibration that is from the exhaust ( I have transom only prop blocked off) so it could be the box.
Like stated above you could be blowing your props out,Mine used to do that but since I changed the exhaust and went transom only it will not. Its about 250lbs lighter in the rear now. Some one had asked on here if the no exhaust through the prop helped with blow out. I honestly don't know, I could have gotten better a driving it also. But at this point I don't think you have a big problem,if at all.

Ok, Box has a broken L bracket on the starboard side. The one that goes thru transom. I can just about bet this is making some noise.

ST box is off, had several areas where the fg had not properly bonded and had seperated. the noise it made while flexing it is very similar to the noise accompaning the vibration. I hope to get out on the water to verify that this is the problem.

Hi looseconnection thought i might jump in on this one , what i have learned over time with my 08 292 is [1] the steps under my boat seem to make dirty water . meaning air and disturbed water makes air pockets to the props so i need to roll on a slow but castanet power load .you can feel the props grabbing and letting go a little so just take your time for minute or two and its just fine [2] drives in [3] your tabs down or not its up to you , i get tired of messing with mine lol ,

You should notice less vibration with it off. Plus it should sound a little meaner coming on plane. Enjoy.

You will enjoy having the box off! Less weight, better sound. Don't forget to add external rubber flappers on the exhaust tips.

Got out today for a brisk 55 degree ride. Noise is gone, vibration is just prop slip. I can ease it up on plane and only get a little vibe or nail it and get a lot. I am also spinning 26 inch props, so I imagine more blow out than boats with 28 s. Solid 67 on the limiters today. But one of my tach s took a dump. Hurray, I new I wanted a tach for christmas.

damn wish we could get out, then again wish we could get the snowmobiles out, were stuck in the middle

Was looking at my boat all covered up yesterday morning. Wishing, Dreaming, Hoping for an early spring.

Don't let LC fool you. I was freezing my baguettes off!