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Old 08-12-2004, 05:49 PM
Storm861triple Storm861triple is offline
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Boat: 1992 Mastercraft Prostar 190
Location: Park City, UT
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Question about power.

For those that don't know, I have a '92 Prostar 190. It is bone stock and original except for a 13.5" four blade. It is rated at a whopping 240 hp.

I have several friends that have '00 and newer boats;
'00 Malibu Sunsetter LXI: 13" 4 blade; 320 hp I think
'04 Gekko GTO22: 13" Acme 3 blade; 310 hp I think
'02 Air Nautique: ?? Prop 320 hp PCM

My boat will DESTROY these newer boat out of the hole, and match them up top. I can pull up a slalom skier in 1/4 the time these newer boats will. In a from-a-stop-drag race, it's a slaughter. And after getting up behind mine, getting pulled by these newer boats feels like getting pulled by an I/O! Granted, they are both over propped for this elevation. The Malibu turns 4800 RPM at WOT, when it should be turning 5050, I believe. But look at mine, I'm dogging my engine down w/ that 13.5" prop. I managed like 3999 RPM down at Powell last weekend.

Why does my old boat have so much more punch? Is that old 351 under-rated? Are the newer engines over-rated? I don't think my boat is that much lighter? (I think mine's 3500 lbs) I believe even though the new engines are rated at higher peak power, they still make more (or are rated to make more) low end torque, w/their roller cams, modern heads and combustion chambers (vortec heads) and MPFI. I know the LS1 based engines make 300 lb-ft of torque at 1000 RPM!! Some thing my old windsor could only dream about. So I don't want to hear about how the old engine makes more low end torque.

So what is up here?
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Old 08-12-2004, 06:47 PM
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Thrall Thrall is offline
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Did you forget to mention that you punched it out and piped it to match your sled?
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Old 08-12-2004, 08:27 PM
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JimN JimN is offline
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One thing to consider is the efficiency of the hull. Yours may be more efficient than theirs, but I'm just guessing now. I don't have any specs for them. If theirs have more wetted surface, they'll have more drag and it'll be harder to get out of the hole.
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Old 08-13-2004, 09:28 AM
Knoxes
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3500 lbs?? My 88 PS190 is only 2200.
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Old 08-13-2004, 09:37 AM
OhioProstar OhioProstar is offline
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My '95 loaded on the trailer is 3400 lbs....I would guess 900 for the trailer so you are more likely in the 2500 lbs range. The newer boats are heavier...that might make the difference.
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Old 08-13-2004, 11:21 AM
Storm861triple Storm861triple is offline
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Boat: 1992 Mastercraft Prostar 190
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Quote:
Originally Posted by Thrall
Did you forget to mention that you punched it out and piped it to match your sled?
Dude, That made laugh out loud!
"Yep, she's got triple pipes, trail porting, billet heads, and a sick clutch kit."
[reality check/]
"Whoa, uh...I'm stuck in the wrong sport here!" LOL.

You guy's are right, I did a search and found out the boat is lighter than I thought; I guess somewhere in the mid 2500 lb range. I wouldn't think the Sunsetter would be THAT much heavier...

But maybe.
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  #7  
Old 08-13-2004, 11:29 AM
T Scott T Scott is offline
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Actually, your 1992 might have the 285hp HO engine. The 1991 model had the 240hp and I don't think it passed AWSA certification for slalom that year. (Somebody please correct me if this is inaccurate) In 1992 they re-vamped the heads to give it "High Output" which in turn brought the power up to 285hp. I used to own a 1992 and it was a monster out of the hole. My good friend owns a 1991 with the 240hp engine and my old 1992 was much quicker.
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Old 08-13-2004, 11:36 AM
Storm861triple Storm861triple is offline
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Boat: 1992 Mastercraft Prostar 190
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Well that's interesting. How would I find that out? The sellers told me that it was the 240 hp engine, and it has the "Silent Master" exhaust which I can only imagind is pretty restrictive, but I don't know.

Update, the Sunsetter LXI is 2900 lbs,
The Gekko GTO 22 is 2350 lbs.

Even if I put 4 people in my boat, it would still smoke the others out of the hole. Weird.

-Tom
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  #9  
Old 08-13-2004, 12:19 PM
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Bert Bert is offline
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The 1991 model had the 240hp and I don't think it passed AWSA certification for slalom that year. (Somebody please correct me if this is inaccurate)

The 91 had AWSA certification.
Can any one answer this question. My Mastercraft manual specs 240HP but the Indmar manual specs 250HP for the 351. Which is it?
My ski partner has a 94 with the 350 TBI and the boats perform identical. His has a 13 x 13 Nibral and mine has a 13 x 13 Stainless.
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  #10  
Old 08-13-2004, 03:32 PM
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Hoff1 Hoff1 is offline
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Bert, you have a good question. My manual on my 90 Maristar quotes 250 as well, but all indications here are 240. I agree that the engine seems to have more power than what you would expect.
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