Need Help 24' Superboat
05-27-2012, 07:31 PM
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Need Help 24' Superboat
I just bought a 2000 24' Stepbottom Superboat with a 225 mercury promax just rebuilt new pistons and cranks and new lower unit.
I took it out for the first time today and something is wrong because with myself and 4 others our max speed was 43(GPS).
The boat had 30gallons of gas in it and I would think we would reach about 60mph. The racing unit was replaced by a non-racing lower unit(talked to John coen and he said this shouldnt change the speed). The rebuilt motor has about 2 hours currently on it.
Anyone have any idea what's wrong?
I took it out for the first time today and something is wrong because with myself and 4 others our max speed was 43(GPS).
The boat had 30gallons of gas in it and I would think we would reach about 60mph. The racing unit was replaced by a non-racing lower unit(talked to John coen and he said this shouldnt change the speed). The rebuilt motor has about 2 hours currently on it.
Anyone have any idea what's wrong?
05-27-2012, 08:27 PM
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You failed to mention prop & rpm @ wot
Does it come out of the hole strong & bang rev limiter?
If the motor runs good, I'd bet the prev owner just slapped a junk or under sized prop on after replacing the lower to save a couple $ or keep his $$$ wheel.
Does it come out of the hole strong & bang rev limiter?
If the motor runs good, I'd bet the prev owner just slapped a junk or under sized prop on after replacing the lower to save a couple $ or keep his $$$ wheel.
Last edited by scarab63; 05-27-2012 at 08:37 PM.
05-28-2012, 08:47 AM
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I'd bet the guys here http://www.screamandfly.com/forumdis...ing-Discussion
know whats going on with your boat.
know whats going on with your boat.
05-28-2012, 04:10 PM
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Like I suggested...pm rcchevelle. Rick has a 200 on similar hull ( non stepped ) so he may be able to offer you a baseline , or comparison . But imo a 22 is way low & sounds like ya prob.
His straight bottom 24 with a 200 merc is just above 60 I believe
Good luck
EDIT..... I thought these motors had 1.65 lowers, did research turns out they are 1.75 & a 25 pitch may be a bit ambitious.....either way I'd start playing with wheels & prop height.
His straight bottom 24 with a 200 merc is just above 60 I believe
Good luck
EDIT..... I thought these motors had 1.65 lowers, did research turns out they are 1.75 & a 25 pitch may be a bit ambitious.....either way I'd start playing with wheels & prop height.
Last edited by scarab63; 05-29-2012 at 07:12 AM.
05-29-2012, 10:30 AM
#10
Like I suggested...pm rcchevelle. Rick has a 200 on similar hull ( non stepped ) so he may be able to offer you a baseline , or comparison . But imo a 22 is way low & sounds like ya prob.
His straight bottom 24 with a 200 merc is just above 60 I believe
Good luck
EDIT..... I thought these motors had 1.65 lowers, did research turns out they are 1.75 & a 25 pitch may be a bit ambitious.....either way I'd start playing with wheels & prop height.
His straight bottom 24 with a 200 merc is just above 60 I believe
Good luck
EDIT..... I thought these motors had 1.65 lowers, did research turns out they are 1.75 & a 25 pitch may be a bit ambitious.....either way I'd start playing with wheels & prop height.
Nah, I run a 250EFI now. Previous motor was a 225 merc 25" carb fishing motor, and the boat ran high 50's consistently, 59.8 on a good ay with the 225. Something is definitely not right nere, he has a step, a motor setup to turn more RPM, most likely a lighter hull than a Pantera, and runs 15ish miles an hour slower than I did with a tired fishing motor. First palce I would look at is prop, but right now I run 55 with a 19 pitch 4 blade at 6000 RPM, or 60+ with the 21 3 blade at 5400, I find it hard to believe that prop is that bad? Props are somewhat cheap though and readily available to borrow. My choices for that motor would be a 23 Mirage Plus for all around speed/handling, 23 Tempest for speed, or a 23 trophy plus 4 blade for handling.
Last edited by rchevelle71; 05-29-2012 at 10:32 AM.
