Is the prop wrong? 4.3 V6 Bayliner

[Hansolo99]

OK so we went out on my friends new boat to him (2004 Bayliner 195 4.3L V6). It has a 14.5 x 19 prop and the thing tops at 43 MPH, but his RPM's are at 3900. That is full throttle. The motor sounds fine, oil pressure etc. Could it be propped wrong?!?!?

 

[Subliminal]

Re: Is the prop wrong? 4.3 V6 Bayliner

Sure sounds wrong. The 4.3 should wrap out at 4500.

 

[Hansolo99]

Re: Is the prop wrong? 4.3 V6 Bayliner

Yeah the manual actually says between 4400-4800 RPM. Not sure what the deal??

 

[QC]

Re: Is the prop wrong? 4.3 V6 Bayliner

OK, I have moved this over to the prop section although it may be an engine issue or something else . . .

If the numbers are right, and it has a 1.81 gear ratio, as I think it does, then the tach is wrong. We need to know how you got the speed? GPS? If the speed is correct, and the rest of the numbers are correct then the tach is the issue, nothing else. 43 MPH in a 195 is decent, so that tells me the engine is close, so again, I think this is bad data, not bad stuff

Edit: If I plug in 10% slip I get 4806 RPM, and I believe the prop may be on the small side actually so might even run well with a 21". Need to confirm the speed number or I am full of baloney . . .

 

[Hansolo99]

Re: Is the prop wrong? 4.3 V6 Bayliner

With the SPEEDO and my boat next to him. He said it read 43 and my boat was doing about 40+ so I would say it is accurate. How do I test the TACH to see if that is wrong? Oh yeah SORRY I noticed it got moved and started on the thread that more people can help and narrow down the problem. Tried to delete it, but don't know how...

 

[QC]

Re: Is the prop wrong? 4.3 V6 Bayliner

I'd still like to see speed with a GPS, but I am still confident we're dealing with a tach issue. Most marine tachs have a switch in the back for 4, 6 or 8 cylinder engines and another for outboards. I'd start there

 

[mpod]

Re: Is the prop wrong? 4.3 V6 Bayliner

FWIW, My 09 195 4.3L came with a stock 3 blade 21p. I don't recall the diameter off the top of my head.

At WOT RPM's were 4600 and top speed was 48-51 (GPS) depending on conditions and load.

The 21 pitch had a slow hole shot so I switched to a 4 blade 19 pitch. WOT RPMs are still about the same but top speed has dropped 3-4 mph.

Don't know if this helps but it might give you a benchmark.

 

[Hansolo99]

Re: Is the prop wrong? 4.3 V6 Bayliner

FWIW, My 09 195 4.3L came with a stock 3 blade 21p. I don't recall the diameter off the top of my head.

At WOT RPM's were 4600 and top speed was 48-51 (GPS) depending on conditions and load.

The 21 pitch had a slow hole shot so I switched to a 4 blade 19 pitch. WOT RPMs are still about the same but top speed has dropped 3-4 mph.

Yes that helps a lot. So then the speed is in line with the pitch he has on it. It is at about 43 MPH with the 19. He ordered a 21 pitch so I hope that helps. I think it is the tach now just have to figure out how in the world to test it.........

 

[QC]

Re: Is the prop wrong? 4.3 V6 Bayliner

Check the back of the tach first. Lots of ways to test, but may not need to if it is set wrong

 

[Hansolo99]

Re: Is the prop wrong? 4.3 V6 Bayliner

Check the back of the tach first. Lots of ways to test, but may not need to if it is set wrong

Yeah I am going to try that tomorrow morning for sure. Thanks so much in advance guys. Hope I get this all worked out.......

 

[spikedbat]

Re: Is the prop wrong? 4.3 V6 Bayliner

easiest way to test would be to put another tach on the boat.
u could use something as simple as a timing light with digital tach display.

then u'd know forsure.
my 4.3L 190hp merc does 50mph with a 14.25 x 21P prop. thats max with light load.

 

[pat8839]

Re: Is the prop wrong? 4.3 V6 Bayliner

I've got a 2006 Bayliner 195 that I have a 4.3L that came with a 14.5" 19* pitch aluminum prop (no idea what brand it is) and WOT with trim all the way down was right at 5,000 RPM's and 44.3 MPH.
If I trim it up slighty it will go up to 46.2 MPH. If I trim it up too much RPM's hit 5,200 and rev limited kicks in.
Maybe that helps to add to your statistics for comparision.

 

[liquidlew]

Re: Is the prop wrong? 4.3 V6 Bayliner

You might want to go out and look at the #'s on your drive, just to be sure you have the right ratio. I just recently discovered I had a 1.50 ratio for a V8 on back of my 4.3, so I got the right one which was a 1.84 ratio, and now all is good, 4600 rpm with a 21p prop. With the wrong ratio I could never get over 3900 rpm either. AND, you don't want to go up in pitch to a 21, that will bring the rpms down even more, you need to go lower, like a 17, that could get you closer to where you need to be.

 

[Hansolo99]

Re: Is the prop wrong? 4.3 V6 Bayliner

Well had the tach tested and sure enough it is the tach. QC you where right!! It is off at idle at about 500 RPM's and as the throttle increases the more it is off. At WOT it is off by almost 1200 RPM. They are going to check to see if they can order just the tach from Bayliner, but they say he wil probably have to get the whole cluster which will be an arm and leg we hear.

Ok so here is the next question can a universal automobile TACH work? He was thinking about mounting one in the engine compartment and keep the one in the dash the way it is instead of putting out all the CA$H. With one mounted in the engine compartment he will still have an accurate way to read the RPM's.

Well can it be done???

 

[QC]

Re: Is the prop wrong? 4.3 V6 Bayliner

Cool!! Whenever we have negative slip (boat goes faster than the numbers theoretically allow) then I start screaming "tach". I would bet at least 25% of the time we get performance complaints here it is bad data, unrealistic expectations or incorrect operation as opposed to the engine or other mechanical stuff being wrong or messed up . . .

Can you get us a decent pic of the tach? Maybe we can do better than your dealer

 

[Hansolo99]

Re: Is the prop wrong? 4.3 V6 Bayliner

This is it.

 

[QC]

Re: Is the prop wrong? 4.3 V6 Bayliner

Did he get in the back of that tach and check the 4, 6, 8 switch? If it is a percentage off I still suspect it is simply set wrong . . .

 

[Hansolo99]

Re: Is the prop wrong? 4.3 V6 Bayliner

He said he did but I cannot be certain. I checked and there are 2 different areas that can be adjusted with a screwdriver however I cannot see anything that says 4,6 or 8. Is there somewhere that I can see if it is something I can do??

 

[Kainon]

Re: Is the prop wrong? 4.3 V6 Bayliner

If you can't correct with the settings on the back ( which you may be able to do while, running, but should do with KEY off )

And If Bayliner does honor a warranty replacement,

I would contact VDO for a replacement or REPAIR.. ( as they are the manufacturer )

I would not replace entire cluster unless you REALLY wanted to..

good uck.

 

[QC]

Re: Is the prop wrong? 4.3 V6 Bayliner

Here's a link to a VDO Tach Manual. Looks more complicated than a typical one, but definitely adjustable. I still suspect this is set wrong based on what you are posting. My guess is it thinks it's a V8 and reading correspondingly low . . . But that scrambles my brain, so I might be off and it is set for a 4 cyl and reading that percentage off which would be more of a percentage off i.e. 4 to 6 as a percent vs. 8 to 6 as a percentage. Tach should be off by one of those percentages if I am right . . .