If not for bad luck I'd have none....finally got boat working and Big block goes boom

scoflaw said:
This isn't true, more power will allow you to run a taller prop which will give you more speed. Surprised Lazy Days hasn't seen this thread, He's owned that boat and knows what speed it's capable of. I could be wrong but I believe he was mid 40's with a small block. Maybe PM him.
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That's kinda what I was thinking. More power can push bigger prop at 4200 rpm or wouldn't more power mean my current props end up spinning to higher RPM so as long as the engine internals can handle it I'd be okay. I agree, I know it's a cruiser but it should be able to cruise at 30-35 and too out in the 40s
 
WetPleasure said:
That's kinda what I was thinking. More power can push bigger prop at 4200 rpm or wouldn't more power mean my current props end up spinning to higher RPM so as long as the engine internals can handle it I'd be okay. I agree, I know it's a cruiser but it should be able to cruise at 30-35 and too out in the 40s
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I have plenty of power, but the throttle doesn't allow me to exceed 4,200 rpms. There's no more throttle. There's no reason to exceed it either if you look where the power range is on a boats cam. All you'd be doing is making noise , burning fuel and not producing any more power.
If you want to go faster, you change the gear/props. If you increase the power in the motor, you can make up for the power loss you'll lose by going with a taller gear ratio/prop which increases your top speed.
 
WetPleasure said:
That's kinda what I was thinking. More power can push bigger prop at 4200 rpm or wouldn't more power mean my current props end up spinning to higher RPM so as long as the engine internals can handle it I'd be okay. I agree, I know it's a cruiser but it should be able to cruise at 30-35 and too out in the 40s
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Absolutely, my 2006 280 did 50mph with 520 hp. The 280 with the single 425hp 8.1 was mid 40's. Your smaller boat should make that speed
 
scoflaw said:
Absolutely, my 2006 280 did 50mph with 520 hp. The 280 with the single 425hp 8.1 was mid 40's. Your smaller boat should make that speed
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You changed your props though right?
 
I'm getting confused lol.. and yes I apologize for being all over the place. Ultimately just trying to understand what parts need to go back into the new motor. If there are some aftermarket parts that don't cost an arm and a leg I want to put them in. I keep reading that even with cast internals a 454 can easily make 400hp. If I currently have 330 hp and that got me 35mph at WOT than hell yeah I want another 70hp!

It is important to note that it's very likely something was wrong and that is why I was only getting those specs.. I do need to empty holding tanks and freshwater tank that is a lot of weight and we had 4 adult males on board but still, if the torque is what it's supposed to be ona big block it should still move that load well.
 
scoflaw said:
No stock set up. B3 2.2ratio 24pitch
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How did you get it up to those speeds? Higher rpms? How did you increase the rpms? I don't have anymore throttle. I have 22p
I apologize to the op. Sounds like I may have been passing some bad info. Scoflaw knows what he's talking about.
 
I had a pair of 260hp 5.0's with a 5000rpm redline. That 260 usually comes with a 300hp 350 mag.with a 5k redline.
 
scoflaw said:
I had a pair of 260hp 5.0's with a 5000rpm redline. That 260 usually comes with a 300hp 350 mag.with a 5k redline.
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yes. seems like most 260s came with the 5.7. 5.0 was an option and i haven't seen many in my research and then 7.4 was an option and also dont seem to see or hear about many of them. the 7.4 is obviously a heavier motor but when you look up the specs, man it is WAYYYYYYY more torque even if it is only rated 30hp more.

Does Sea Ray foam fill their hulls? Honestly, I'm getting scared that i've got some sort of saturated foam situation going on. Also, the boat was so tippy which seems to be reported by many owners because it's a top heavy boat for such a narrow beam but man I'm wondering if i've gotten something bad going on !!!!! I have no experience running this hull, bought from a friend for $5000 as a fun project to flip. now ive got 31k into it and no motor. I'm pretty fucked. Cruisers just dont hold value like center consoles do. For the amount of restoration that I have done all around on this boat as a center console it would be selling for 100k.
 
Those heads are inferior compared to the 350 vortec heads, there're all grunt with no revs. So if you want speed you need to increase rpm.
 
scoflaw said:
Those heads are inferior compared to the 350 vortec heads, there're all grunt with no revs. So if you want speed you need to increase rpm.
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not that i doubt you but at some point HP is HP. there is just no way that a 454 should be slower than the 5.7 hindsight being 20/20 i would have handled this all quite differently. now i just gotta eat the shit sandwich. It's only money, I'll make more. What this probably means is i'm going to be stuck keeping this boat for a couple years instead of buying the new center console i was planning to put profits of this boat towards lol. There are FAR worse problems to have in life than not getting to run the desired boat. I'm just annoyed because I've really been trying to do things right on this thing and just want a safe, properly working boat and it's just major shit one after the other lol.

Regarding the heads, i keep coming across a LOT of threads on varying forums that say people give the peanut port heads a bad rap. Are they going to make 600hp? no. But can you build a solid, reliable, torquey motor to 400+ hp with those heads, yes. That is what i'm trying to figure out how best to do.
 
scoflaw said:
Google says it's a 42.9mph boat with the 350 mag. Couldn't find any info on the BB
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Yep and I'm sure that's with a captain that weighs 140lbs 1/4 tank of fuel and empty freshwater and holding tanks so maybe I'm not that far off but I am having a hard time believing it.

Are these sea rays foam filled? That is next set of googling
 
scoflaw said:
Google says it's a 42.9mph boat with the 350 mag. Couldn't find any info on the BB
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Parts aside for keeping the motor from grenading, how would you physically get the rpms up higher? New throttle? Throttle adjustment to be able to open the carb up more? If the carb is wide open already at 4,200 rpms, the only thing I can think of to get to 4,500 is changing the pitch of the prop or the gears in the outdrive. No? You know I'm not a pro boat guy. I'm just looking at how engines and gearing works.
 
scoflaw said:
You should take it to the scale, that will tell a story. What's your max rpm?
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i took it to the scale and it came in at 14,660. my truck i know was right at 5000 and i estimate 1500 for the trailer which would put this boat at 8000lbs. I had just gone to the gas station and filled the tank and pretty sure the freshwater tank was full and i don't know status of the shitter tank other than the light on it says 1/2 when key turned on. I haven't had a chance to go get it pumped out. I think published dry weight is 6200lbs so full tank of fuel is 500 and then freshwater full tank another 250 and possibly another 250 in full holding tank so that would get me to 7200 lbs. Dry weight is probably with 5.7, how much more does 454 weigh? 2-300 lbs so now i'm at 7500 lbs. hmmmmmm
 
Simple test to see if your T Body or carb is too small for your motor is hooking up a vacuum gauge and it should read 0 at WOT.
 
HawkX66 said:
Parts aside for keeping the motor from grenading, how would you physically get the rpms up higher? New throttle? Throttle adjustment to be able to open the carb up more? If the carb is wide open already at 4,200 rpms, the only thing I can think of to get to 4,500 is changing the pitch of the prop or the gears in the outdrive. No? You know I'm not a pro boat guy. I'm just looking at how engines and gearing works.
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you certainly know a lot more than i do. I just keep reading and trying to understand and i'm hearing things like "domed pistons to increase compression ratio" and other things that supposedly increase power but i'm really getting lost now. you keep reiterating that rpm is rpm. I guess i'm expecting that if i increase the horsepower of a motor and keep the same drivetrain that i would see more rpm


My head is spinning. There is just no fucking way this boat with that big of a motor can only do 35mph. I wish i had been out on it solo to see how much loading the boat affects it but i'm sorry my center console with a 250 yamaha would top out at 50mph with me running solo at 5900 rpm. When i loaded that boat with my wife, 3 year old, mother and father in law and sister in law we could still top out at 46mph. 23' center console so lighter weight but bigger 103 gallon gastank . not truly apples to apples but i'm just saying this 454 should be a torque monster so no matter how many people on board she should still get up and go. the torque curve for the peanut port heads on a dyno is pretty impressive. it holds that torque through a pretty wide range and its something like 450lb ft
 
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