Replace 3.0 with 5.0 mercruiser? Whats involved?
H Krause
>
> I have found a 98 model mercruiser 5.0 that is fairly cheap in contrast to some
> used 3.0's I've found so far. My boat has an 86 3.0 in it right now on an alpha
> drive. So my question is what all will I have to do to make this swap? Is it
> even worth my while? Any ideas on total cost? The 5.0 is complete except for
> manifolds and risers.
>
> T
1. What's the maximum horsepower your boat is rated for, if it is so rated.
2. What is the rated horsepower of the 5.0 liter engine?
3. Does it exceed A?
4. If so, you will have difficulties obtaining insurance, which may not
matter to you with a 14-year-old boat, but it may also prevent you from
obtaining liability insurance, which will matter to everyone else.
Otherwise, check for mounting holes and instrumentation, among other things.
--
Harry Krause
- - - - - - - - - - - -
Remember: COBOL can be cured if detected early.
H Krause
>
> This particular boat is a 19' Wellcraft. I'm not going out to see what its
> rated for but I can assure you it can handle the 90 hp increase. The 3.0 barely
> pushed it as far as I'm concerned. I'm not concerned with the insurance matter
> as I have allstate and i dont think they would want me to take all my insurance
> elsewhere considering their track record with me. Now.. back to the real
> question.. whats involved. Its more than holes ya know.
The question is not whether you think the boat can handle the power, but
whether what it is rated for. If you exceed the sticker limit, you will have
insurance problems and if you are ever boarded by the USCG for inspection,
you may be in another kind of trouble altogether.
I'm not saying your engine swap will push you over the edge...but it is
worth checking out. And maybe a 4.3 liter engine would be kosher and easier.
--
Harry Krause
- - - - - - - - - - - -
Junk - stuff we throw away. Stuff - junk we keep.
RAJJNEEF
RAJJNEEF
RAJJNEEF
way better than others I've seen. Thats the reason I'm asking about it. If your
a boater then you know a 19' Wellcraft can handle this power. If it was a 17'r
then I might think about that a little more.
Dave Hall
There is no question in my mind that a boat of your size can handle a
5.0 engine. The thing that you need to watch for is the fiberglass layup
schedule. Some boats (Most notably Bayliner) have been know to make the
hull strength consistant with the power that was to be used. In other
words 2 boats of the same model, but with different engines would have
different hull strengths. This was seen as a cost saving measure, and
not all builders do this. But I would check with Wellcraft. If you get
the green light, then go for it.
Things that you might consider while doing your engine swap:
You will need to change the exhaust tube to a "Y" pipe for the 2
manifolds. The front engine mounts will have to be changed. Your motor
box may have to be modified to fit a larger engine. The Alpha drive will
have a higher gear ratio with a 4 cyl engine than a V8. Typically the
3.0 was a 1.98:1 and the V8 was either 1.65:1 or 1.5:1. You should think
about getting the gearset changed. If you don't, you will have to go to
a much higher pitched prop, and gearset torque strain may be increased.
The rear engine mounts and the gimbal housing should be the same. Just
be sure to properly align the engine before you try to re-install the
drive.
Dave
fr...@home.com
I had a 19' Wellcraft a while back, the 4.3 seemed to be the ideal
power plant for this boat. Unfortunately I had the 170 hp/470
Mercruiser. The boat flew with the 170 hp.
My boat was was well built, not overbuilt, I thought of
repowering, but after looking at the stringer system I didn't feel
that it would handle a V-8. I got a second opinion from a mechanic
and he confirmed my opinion. The boat was a 192 American Cuddy.
After witnessing an engine hydro-lock ( water getting sucked up
into the engine), I would be cautious of getting too stern heavy.
You may end up having to modify the exhaust risers with extensions?
It could get ugly.
Taking in consideration Dave's info ( gear ratios, exhaust, engine
mounts) etc the engine deal might not be that attractive.
Ray
--
Relax- Take a San Diego Cyber Cruise!
www.sdboats.com
Sent via Deja.com http://www.deja.com/
Share what you know. Learn what you don't.
RAJJNEEF
think its probably gonna get expensive to do this changeover so i might just go
with the standard power again. Its just hard to pay as much if not more for a
stupid 3.0 as I will for a bigger and stronger motor.
Daniel O'Brien
I have a 90 Wellcraft Elipse 186 Bowrider with the 3.7 Mercruiser rated at 165 and
the boat runs great pulls skiers and people with no problem......thought that might
help at least as a reference point......Dan
Tim
I agree, you're better off staying with what you have...
then again, you could always get a bigger boat.
F*O*A*D
james...@gmail.com
Poquito Loco
are still pertinent today!
F*O*A*D
1. Solved the problem
2. Got rid of the boat
3. Hasn't looked here in at least half a decade
4. Might be dead