top speed and rpms
 

guys in need of a little info here. i have the 18' shabah with the 3.0 and was trying to get a little info on the best prop u have found for this paticular boat and what kind of top speed youre getting out of it and what rpm range is best.

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Re: top speed and rpms
 

by the way its a 2000 model

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Re: top speed and rpms
 

Welcome to MOC jknotts!

If you'll look HERE there is a ton of info on props , WOT , & top speeds.
Also if you do a search , there is a ton more.
There is a few members who have your setup. "Andy b" is one that comes to mind right off the bat.
According to the 2000 Mariah brochure , your Shabah with the 3.0l will run 40-46 mph. But.........that is in optimal conditions with not more than half a tank of fuel and maybe 2 people on board.
Usually , the 19p 3blade aluminum prop is what was used for their testing if I remember right.:)

Re: top speed and rpms
 

k thanks for the info. i have a 14.5x19 on mine but think its older and slightly bent so therefor its flexing a bit causeing me to lose on top and bottom end. its having trouble pulling out of the water and doesnt run but about 32-35 on top with just me and cooler in boat. im looming at the smart tabs everyone else is talking about to just trying to get some opinions thanks

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Re: top speed and rpms
 

They are the only way to come out of the hole quick.:wink_thumbup:
Been using them for years.

Re: top speed and rpms
 

What is your WOT at that speed?

Re: top speed and rpms
 

dont mean to sound stupid but ive been tryin to figure out what wot means lol

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Re: top speed and rpms
 

i also have access to a 4.3 with everything i need to swap it over for $500 but ive reaf in different forums that its not worth the time swapping it over for the little gain i would get cant really get a clear answer on this ? either lol

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Re: top speed and rpms
 

I've got the 180 Diablo with a 4.3L Volvo Larry ;)
Do keep up :rolling_laugh:

top speed and rpms
 

WOT-wide open throttle.

Re: top speed and rpms
 

Sorry ,
WOT=Wide Open Throttle
As far as the conversion.............it all boils down to how much you like your boat!
You might want to just keep this boat for awhile , and later trade it in on a bigger one.
Everybody that has a boat always gets the 2 ft syndrome.:rolling_laugh:
After having a boat we all want one bigger and better.:yes_grin:
That's just the boaters life cycle.:rolling_laugh:

Andy...........what was I thinkin'
Time for a beer and a nap!

Re: top speed and rpms
 

well....if i have a female and 3 kids in the boat it runs about 30 and turns about 42-4300 rpm and if im by myself it says its turning 6000 but i find that hard to believe cause the motot doesnt sound as its turninv that hard.

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Re: top speed and rpms
 

I personally wouldn't have the 4 banger in my boat!
As a guild i'm getting a steady 50mph (GPS) from my boat in the right conditions,
But TBH it's a fools quest!
I use my boat on the salty stuff and everyday is different with tide and wind conditions.
If you get fixed on top speed you'll only be disappointed on the days you don't hit it...
Of course it's probably a bit different running on fresh water lakes where the conditions are a lot less variable.

don't do that or you'll be fitting the 4.3 sooner than you might wish.....lol

Re: top speed and rpms
 

Take a look at the post "mikeyt" made here.
He explains about resetting the tach.
I'd try that first.

Re: top speed and rpms
 

well ill be keeping this kne for a few years. gonna get the vehicles and house paid for (3 more years) and gonna want to upgrade to at least a 23' with big v8 as ive street raced lots in the past and love my v8's lol. just wanna get it before im to old to enjoy haha

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Re: top speed and rpms
 

According to my prop guy who has 30 years in the industry, There is no such thing as a free lunch....At first I had no f***ing idea what the guy was talking about until he broke it down for me....WOT top speed is kind of a joke. If you do 30 MPH top end, you will wanna do 40, when you hit 40, you will wanna do 50 and so on and so forth....2 of the same props on 2 comparable boats could run entirely different. If you have a local prop shop, see if they will let you try out different props and once your tachometer is fixed, get a baseline on what you have. Being a 3.0 litre, your best bet would be some smart tabs FIRST with the prop you have, then go from there. Tons of good info on props and RPM range on here so it's well worth your while to do some research on the forums.

Re: top speed and rpms
 

I had a 3 blade 19" on mine and went to a 4 blade 17". The majority of my time is spent towing kids and wife around or a little cruising. Hitting 60 in a boat doesn't excite me much. I'd rather have the boat excel where I'm using it. Mine won't hit 40 mph with the prop change now, but it has a deadly hole shot and almost instant plane. I cruise along about 3500 rpm with the towables. Couldn't be happier with it.

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Re: top speed and rpms
 

If its reading 6000 rpm's your rpm isn't reading right. On back of rpm gauge there is a switch for 4 6 and 8 cylinder engines.yours is probably set up for a different engine size. I have a v8 and I had to move the dial to v8. It was at a v6.