kevinb
05-20-2002, 04:19 PM
I have a 26ft Firehawk cat that weighs about 4,000lbs dry. I figure with 50gal of gas and all my gear it weighs in at about 4600 lbs, plus people.
For power I have a 454with:
comp cams (see cam card here: http://www.netprofithosting.com/camcard.jpg)
It has an edelbrock short intake
holley 850 double pumper carb
and nice Stainless Exhaust Manifolds
I have a Bravo1 24" pitch prop
My boat will drive up to only about 4300 rpms, which translates to 60mph. It moves up to 4,000 rpm quickly, then crawls to 4300, 4500 if I trim it up high.
what horsepower should I expect from this motor? Shouldn't this motor push the boat to 5500 rpm and above? I know a 496 in a new firehawk comes with a 28" prop. Am I really that low on power?
Is the right cam in the boat? Am I set on "reliable" or "hi perf" with this cam? At what rpm does this cam peak? What would you say redline is on my motor?
With the short intake, am I robbing myself of top end?
What about the prop? Is 4 blade best? why is that? Any other prop you suggest?
I just tried out an MSD ignition and there was no change. If I put the boat in neutral, it will rev up to 6000 rpm, maybe higher... so I know it's not the rev limiter.
The fact is I'm no faster than a 29 profile Vbottom with a 454 mag and I'm actually slower out of the hole.
What is most important to me is cruising speed, so putting on a smaller prop is not the answer I'm looking for. I want to make my boat pull to 6,000 rpm so I can put a bigger prop on it! I think this motor should be able to do it... so now I'm just trying to figure out why it's not. Any info/data you can give would be appreciated!
Thanks
Also - does anyone know what a 25' eliminator daytona with a 454 would come with as a prop? If it comes with a 21 or 22' prop, maybe I'm expecting too much. But if it comes with a 25 or 26 like I bet it does, I'm bummin.
For power I have a 454with:
comp cams (see cam card here: http://www.netprofithosting.com/camcard.jpg)
It has an edelbrock short intake
holley 850 double pumper carb
and nice Stainless Exhaust Manifolds
I have a Bravo1 24" pitch prop
My boat will drive up to only about 4300 rpms, which translates to 60mph. It moves up to 4,000 rpm quickly, then crawls to 4300, 4500 if I trim it up high.
what horsepower should I expect from this motor? Shouldn't this motor push the boat to 5500 rpm and above? I know a 496 in a new firehawk comes with a 28" prop. Am I really that low on power?
Is the right cam in the boat? Am I set on "reliable" or "hi perf" with this cam? At what rpm does this cam peak? What would you say redline is on my motor?
With the short intake, am I robbing myself of top end?
What about the prop? Is 4 blade best? why is that? Any other prop you suggest?
I just tried out an MSD ignition and there was no change. If I put the boat in neutral, it will rev up to 6000 rpm, maybe higher... so I know it's not the rev limiter.
The fact is I'm no faster than a 29 profile Vbottom with a 454 mag and I'm actually slower out of the hole.
What is most important to me is cruising speed, so putting on a smaller prop is not the answer I'm looking for. I want to make my boat pull to 6,000 rpm so I can put a bigger prop on it! I think this motor should be able to do it... so now I'm just trying to figure out why it's not. Any info/data you can give would be appreciated!
Thanks
Also - does anyone know what a 25' eliminator daytona with a 454 would come with as a prop? If it comes with a 21 or 22' prop, maybe I'm expecting too much. But if it comes with a 25 or 26 like I bet it does, I'm bummin.