496HO/Bravo one Prop Capabilities

[Biglue]

What is the largest pitch you guys have run on this set? Currently running a 24 pitch, but want to speed up a little bit. How far can I go safely without damaging my motor??
Pros and cons of doing so would also be appriciated.
Thanks in advance guys.
Lue.

[dicudmore]

what RPM are you running with the 24?
MOST Ho's are only capable of turning a 22, 23 or 24

[BajaMike]

What is the largest pitch you guys have run on this set? Currently running a 24 pitch, but want to speed up a little bit. How far can I go safely without damaging my motor??
Thanks in advance guys.
Lue.
It depends on the size/weight/hull, but I would think you can go to where you can still get almost to red line on your engine.....about 5200 rpm.
If you can't get the rated rpm, you won't gain in speed.
IMHO....... :confused:
:2purples: :2purples: :2purples:

[Biglue]

what RPM are you running with the 24?
MOST Ho's are only capable of turning a 22, 23 or 24
I'm running 4500 or so.

[Biglue]

It depends on the size/weight/hull, but I would think you can go to where you can still get almost to red line on your engine.....about 5200 rpm.
If you can't get the rated rpm, you won't gain in speed.
IMHO....... :confused:
:2purples: :2purples: :2purples:
Boat is a 26 footer that is supposed to weigh 4400 lbs.

[dicudmore]

I'm running 4500 or so.
then you are already OVER-propped...
try a 23-revolution or a 22 Bravo
that engine should reach ~5K

[BajaMike]

I'm running 4500 or so.
Then don't increase your prop pitch....you should be getting at least 5000 ...... you may get more speed to lower your pitch or get the prop labbed.

[Biglue]

then you are already OVER-propped...
try a 23-revolution or a 22 Bravo
that engine should reach ~5K
What are you running Dan? YOu have a very similar set up dont you?

[Beer-30]

I just went from a 24" B-1 to a 22" B-1, and the boat absolutely loves it. I will keep my 24 as a spare and in case I get any HP surges.
I just drove Tremor Therapy, a 25' Tremor, with an HO and a 23" Revolution-4. I am insterested in seeing if either of my B-1 props add any performance - not that it needs it.
I see a 26' Signature in your signature (no punn intended) and I am sure a 22 would put you up in the RPM a little more. You may be surprised at how much the boat likes it. Something like the Rev-4 or another 4 blade that comes in a 23" may be worth a spin.
4500 is too low.

[dicudmore]

What are you running Dan? YOu have a very similar set dont you?
used to :(
I was running the 23 Revolution 4-blade

[Biglue]

used to :(
I was running the 23 Revolution 4-blade
Oh did you sell it already?
Did you happen to keep any spare props you may want to sell???

[Phat Matt]

what RPM are you running with the 24?
MOST Ho's are only capable of turning a 22, 23 or 24
My HO's are running 30's. ;)

[purrfecttremor]

I have the same set up [25 shockwave] with a 23 revolution running at 5-k.Ive tried others and this combo works the best for Me.

[Biglue]

My HO's are running 30's. ;)
I've heard of peeps ruuning as high as 28's but not the 30's.
What RPM's are you turning?

[dicudmore]

Oh did you sell it already?
Did you happen to keep any spare props you may want to sell???
It is at Ultra Boats for sale, they might consider a prop swap for ya??

[dicudmore]

My HO's are running 30's. ;)
your HO's are special :wink:

[dicudmore]

I've heard of peeps ruuning as high as 28's but not the 30's.
What RPM's are you turning?
twin engine Cat...little different application.
Ask him what prop he had on the Commander :wink:

[BajaMike]

I just went from a 24" B-1 to a 22" B-1, and the boat absolutely loves it. I will keep my 24 as a spare and in case I get any HP surges.
I just drove Tremor Therapy, a 25' Tremor, with an HO and a 23" Revolution-4. I am insterested in seeing if either of my B-1 props add any performance - not that it needs it.
I see a 26' Signature in your signature (no punn intended) and I am sure a 22 would put you up in the RPM a little more. You may be surprised at how much the boat likes it. Something like the Rev-4 or another 4 blade that comes in a 23" may be worth a spin.
4500 is too low.
I agree with Beer-30.....a 23" 4 blade might be just right!
:D

[02HoWaRd26]

Just have that 24 labbed the right labb outta get you 300-500 rpms and that should pick you up 4-6 mph

[Phat Matt]

I've heard of peeps ruuning as high as 28's but not the 30's.
What RPM's are you turning?
I have two engines. :)
http://www2.***boat.com/image_center/data/500/1524Picture_044.jpg
With my Commander I run a bravo1 24. I ran a labbed 24 until I just bent it. It had the same top end but was better out of the hole. If you are running a 26' Sig you aren't going to be over a 26 pitch prop. Especially if you are turning 4500rpm's now. Do you have it trimmed up? Have you played with that at all? You might be able to squeeze out a couple more mph and more rpm's.

[dicudmore]

Just have that 24 labbed the right labb outta get you 300-500 rpms and that should pick you up 4-6 mph
certainly also a viable option :D

[Beer-30]

Biglue looks well trimmed in the sig photo. 4500 does sound un-trimmed with a 24". Hell, my 30 footer was allowing 4900 with the 24" B-1. I have only been out once with the 22", but it loved it out of the hole. Cut the planing time down significantly. I was seeing just over 5000 when I backed out of it, but it was still pulling. If I don't hit the limiter, I will be just shy of it.
It almost seems like you are already spinning a 26?
Getting back to your original post, you really can't hurt the motor. It will safegard itself - rpmwise. If you try to load too much prop, it will lug the motor and that's not the best for it, but you would be unhappy with the anemic holeshot anyway.

[THOR]

My hull weighs 3100 lbs. I turn a labbed 26.5 with my HO, at 5100 rpm.

[Beer-30]

My hull weighs 3100 lbs. I turn a labbed 26.5 with my HO, at 5100 rpm.
That's about right. I am much heavier.

[riverroyal]

496ho,24 pitch,5200rpm,70-72mph

[dicudmore]

My hull weighs 3100 lbs. I turn a labbed 26.5 with my HO, at 5100 rpm.
thats why I said MOST HO's focker...
yours is special ;)

[SHAKEN Not Stirred]

Hey....
I use to run a 26P in the Summer & 28P in the Winter with my old 496/Bravo1 set-up.... ;)
http://www2.***boat.com/image_center/data/500/1780MVC-006F.JPG
Oh yea....I forgot about that lil' thing on the top....... :idea:
Hehehehe!!!
Later,
CJG
:D

[Jake W2]

Any of you guys tried a Mazco 4 blade HP they have an ass load of cup and create alot of lift,I run a 23 pitch Mazco its labded and run it up to 4700 or so rpm on a 5.0 MPI(260 hp wa wa waaa) in a 20 foot Outlaw.So I would say the weight of the hull has a bunch to do with it.
Seems like you guys all talk about just Merk props.
Jake

[BadKachina]

Any of you guys tried a Mazco 4 blade HP they have an ass load of cup and create alot of lift,I run a 23 pitch Mazco its labded and run it up to 4700 or so rpm on a 5.0 MPI(260 hp wa wa waaa) in a 20 foot Outlaw.So I would say the weight of the hull has a bunch to do with it.
Seems like you guys all talk about just Merk props.
Jake
Is the Mazco a rounded ear prop? Most of these step hull boats need the rounded ears for bow lift. Your Outlaw probably ran fine without that extra bow lift.
4500 rpm is way too low. I would definantly start with a 22 Bravo. You can always lab the 22 and add a little pitch to it if you need to. What speed do you run at 4500 rpm? As far as what's safe for your motor, that motor has it's own rev limiter, you can't over tach it. It can safely turn anysize prop you want to put on it.
Another consideration is the Mirage prop. The 26 Kachina's used to come with them. If you can get on plane with one they are usually faster than the Bravos. Try about a 21 pitch, they have a little more pitch than the Bravos so a 21 Mirage is comparable to a 22 Bravo.

[Big Warlock]

29 Warlock Wold Class. Is the balsa wood core, so very light. I thought it was 3800 lbs? Anyway, the fastest way to make your boat go fast is to empty all the crap out of it!!! (Worked for me anyway!) :D

[rivercrazy]

I've played around a lot with props on my 25 Tremor/496HO. Box stock the rev-4 will be the overall best performer.
But if you go labbed, a 25 pitch mirage plus or a 24 pitch bravo 1 will pull better top end numbers. But there are a few trade offs. The 3 blade will slip during sharper turns or with big boat loads. The 24 Bravo will accelerate the best of all those props but you loose some crusing efficiency. And labbed props are sharper so a little more caution is needed.
The Rev-4 ran a best of about 70.5mph
the Mirage Plus ran a best of 71.5mph
And the Bravo 1 ran a best of 72.8mph.
All on GPS, on the same day, light load, with temps in the mid to high 80's.
P.S. York Prop's in Fullerton california did the lab jobs. IMO it would be very difficult to top the work he does over there.

[THOR]

P.S. York Prop's in Fullerton california did the lab jobs. IMO it would be very difficult to top the work he does over there.
I concur

[Throttle]

My first ? would be have you ever reached your rev limiter? If not then you obviously have some room to play with here. I think you said your were runnin a 24 (?). Try a 26... When you find this to be closer to the rev limiter or max rpm, then record your rpm reading with your speedon a gps and have your prop lab finished to bring the additional rpm's up to what you are looking for. cooler temp right now will help you but dont forget you are gonna loose at least a couple hundred rpm in the heat of summer. I am runnin a 26 lab and hittin 77 on the gps. :idea:

[phebus]

If he's not near the rev limiter, he needs less pitch, not more.
Bottom line, talk with a quality prop shop, and give them all they need know to prop you right suh as: engine, approx weight load, approx operating temp, elevetion, etc. They know there stuff, and will save you the expensive mistake of buying the wrong prop.

[dicudmore]

My first ? would be have you ever reached your rev limiter? If not then you obviously have some room to play with here. I think you said your were runnin a 24 (?). Try a 26... When you find this to be closer to the rev limiter or max rpm, then record your rpm reading with your speedon a gps and have your prop lab finished to bring the additional rpm's up to what you are looking for. cooler temp right now will help you but dont forget you are gonna loose at least a couple hundred rpm in the heat of summer. I am runnin a 26 lab and hittin 77 on the gps. :idea:
how would it pull a 26 if he's 600RPM shy with a 24??

[purrfecttremor]

:squiggle: Nice boat Dan whos is it?

[shadow]

My first ? would be have you ever reached your rev limiter? If not then you obviously have some room to play with here. I think you said your were runnin a 24 (?). Try a 26... When you find this to be closer to the rev limiter or max rpm, then record your rpm reading with your speedon a gps and have your prop lab finished to bring the additional rpm's up to what you are looking for. cooler temp right now will help you but dont forget you are gonna loose at least a couple hundred rpm in the heat of summer. I am runnin a 26 lab and hittin 77 on the gps. :idea:
Like Phebus just said.If he aint close to the Rev limiter with a 24 he aint gonna get any closer with a 26.A 26 will put his rpms lower.
Run the 24,record the top rpm's,top speed,get ahold of a reputable prop shop and give them that info.They will be able to get you a feww hundred rpm's.
If you can't get to the limiter @ 5150-5200 with a lab 24 then i would start looking at your drive set up (X) and or the bottom of the boat.

[dicudmore]

:squiggle: Nice boat Dan whos is it?
thanks, its now for sale at Ultra :wink:

[shadow]

thanks, its now for sale at Ultra :wink:
Dan,Whats the progress on the Shadow,have they started on it yet?
Can't wait to see it.You're gonna love it.

[phebus]

Maybe John's next show will be Monster Boat Garage, and he can turn it into a gun ship or something? Just an idea...... :idea:

[dicudmore]

Dan,Whats the progress on the Shadow,have they started on it yet?
Can't wait to see it.You're gonna love it.
I think they are starting it basically anytime :cool:

[Jake W2]

BadKachina YES the Mazco HP4 is a round ear.And you would be wrong about my Outlaw it comes up on the pad now it likes the lift I have seen alot of pics of these 20s running full out and I have a pic of mine alot further out of the water.It gets it far enough out it will prop walk would not come close with the stock 3 ear 23 pitch merk.
Anyway I like it(the Mazco) just thought I would ask if you guys have used them befor.They make cleavers also .
Jake

[Chris Winn]

i am turning 28 (cut down a bit)on my HO.... :)

[phebus]

i am turning 28 (cut down a bit)on my HO.... :)
Yea, but your HO is on juice (Raylar):D

[Chris Winn]

Yea, but your HO is on juice (Raylar):D
true, it migh run even better if it had more than 12 hours put on it this year :(

[jbtrailerjim]

I run a labbed 24 pitch Bravo 1 with my 496Mag. I turn 5000rpm with it.

[Ultracrazy]

I'm running a 26p on my 24 stealth and I'm hitting no more than 4600........are you saying to get more RPM's I should go to a 24p??????

[BadKachina]

BadKachina YES the Mazco HP4 is a round ear.And you would be wrong about my Outlaw it comes up on the pad now it likes the lift I have seen alot of pics of these 20s running full out and I have a pic of mine alot further out of the water.It gets it far enough out it will prop walk would not come close with the stock 3 ear 23 pitch merk.
Anyway I like it(the Mazco) just thought I would ask if you guys have used them befor.They make cleavers also .
Jake
I was thinking you had a Baja Outlaw. Looking at your picture I guess I would be wrong. What's the price of a Mazco compared to a Bravo?

[THOR]

I'm running a 26p on my 24 stealth and I'm hitting no more than 4600........are you saying to get more RPM's I should go to a 24p??????
Precisely. Or, you can lab your 26 and, if it is done right, you should see another 150-200 rpm.

[shadow]

I'm running a 26p on my 24 stealth and I'm hitting no more than 4600........are you saying to get more RPM's I should go to a 24p??????
YEP!! I belive you will be suprised at your all around performance.If that 4600 rpms were in the heat of the summer then a 24 should put you right at the limiter or close to it.
Probablly gonna rub some people the wrong way here but i find all these claims of 26 & 28 pitch props spinning @ the limiter and pushing 80mph hard to belive. Everyone likes those happy speedos,but the same boats with blue motors are in the same range as "these few" boats.

[BadKachina]

I'm running a 26p on my 24 stealth and I'm hitting no more than 4600........are you saying to get more RPM's I should go to a 24p??????
That would be the theory. Every increase or decrease in pitch is usually good for a couple of hundred rpm. You want to be in the area where your motor makes the most hp. I think I saw a dyno sheet on OSO of a 496ho and it made the max hp at about 4850 rpm and stayed pretty flat but slowly dropped off above that. Every revolution of a prop, lets say a 26 pitch, would give you 26 inches per revolution. So a 24 pitch would give you 24 inches per revolution thus allowing your motor to turn it easier. Ideally you want to turn as much prop at your motors peak rpm as possible.
So 4600 rpm divided by 1.5 drive times 26 pitch minus 15% slip = 64.16 mph
5000 rpm divided by 1.5 drive times 24 pitch minus 15 % slip = 64.39
It may be pretty close to the same speed but you end up with alot more midrange and hole shot because it's easier for you motor to turn. Labbing a prop is done to cut down on your slip by balancing and thinning the blades.

[BadKachina]

YEP!! I belive you will be suprised at your all around performance.If that 4600 rpms were in the heat of the summer then a 24 should put you right at the limiter or close to it.
Probablly gonna rub some people the wrong way here but i find all these claims of 26 & 28 pitch props spinning @ the limiter and pushing 80mph hard to belive. Everyone likes those happy speedos,but the same boats with blue motors are in the same range as "these few" boats.
To turn a 26 pitch prop at lets say 5150 rpm at 80 mph would take about 6% slip, that's pretty close to unheard of. :rolleyes:

[phebus]

YEP!! I belive you will be suprised at your all around performance.If that 4600 rpms were in the heat of the summer then a 24 should put you right at the limiter or close to it.
Probablly gonna rub some people the wrong way here but i find all these claims of 26 & 28 pitch props spinning @ the limiter and pushing 80mph hard to belive. Everyone likes those happy speedos,but the same boats with blue motors are in the same range as "these few" boats.
Amen. Liars figure, and figures lie. GPS or go home.

[shadow]

To turn a 26 pitch prop at lets say 5150 rpm at 80 mph would take about 6% slip, that's pretty close to unheard of. :rolleyes:
26 pitch @ 5000 rpm 1.5 ratio 10% slip = 73.9 mph
26 pitch @ 5000 rpm 1.5 ratio 12% slip = 72.2 mph
Go figure? ;)

[BadKachina]

26 pitch @ 5000 rpm 1.5 ratio 10% slip = 73.9 mph
26 pitch @ 5000 rpm 1.5 ratio 12% slip = 72.2 mph
Go figure? ;)
Exactly, how many times have you been at the boat ramp or tied up to somebody and they tell you there boat runs 75 or 80? Then you ask them what prop they're running and it's a 24 or 22? Unless you're running a 1.36 drive and some serious hp maybe, but not with a 496 ho though....... :rolleyes: :rolleyes:

[dicudmore]

Exactly, how many times have you been at the boat ramp or tied up to somebody and they tell you there boat runs 75 or 80? Then you ask them what prop they're running and it's a 24 or 22? Unless you're running a 1.36 drive and some serious hp maybe, but not with a 496 ho though....... :rolleyes: :rolleyes:
I do know of a boat with an HO that runs an honest 75+...
It is running a "worked" 26 more like 26.5
The boat is an Ultra 247 :wink:

[BadKachina]

I do know of a boat with an HO that runs an honest 75+...
It is running a "worked" 26 more like 26.5
The boat is an Ultra 247 :wink:
I'm sure their are boats out there that can do it. How big is a 247 Ultra? 24'? With a 26.5 pitch prop? Thats still 12% at 5100 rpm, very do-able for a 24' boat. ;)

[phebus]

I do know of a boat with an HO that runs an honest 75+...
It is running a "worked" 26 more like 26.5
The boat is an Ultra 247 :wink:
I believe that, but what is the planing time, and midrange like. Something has to be sacrificed to gain max speed.

[phebus]

How big is a 247 Ultra? 24'?)
I bet it has a running surface of about 23', since the swim step is molded in.

[THOR]

To turn a 26 pitch prop at lets say 5150 rpm at 80 mph would take about 6% slip, that's pretty close to unheard of. :rolleyes:
Those prop/speed calculators are okay for estimating, but they negate two very important aspects factored into speed. One is hull type and the other is hull weight. A 3000 lb hull will out run a 6000 pound hull all day long.

[THOR]

I do know of a boat with an HO that runs an honest 75+...
It is running a "worked" 26 more like 26.5
The boat is an Ultra 247 :wink:
F'n smart ass.
I run a 26.5 and am very close to 80 on GPS.

[BadKachina]

Those prop/speed calculators are okay for estimating, but they negate two very important aspects factored into speed. One is hull type and the other is hull weight. A 3000 lb hull will out run a 6000 pound hull all day long.
What if it's a 6k cat and the other is a 3k non-step conventional vee (like a Sea Ray)? I guess the one with the lower slip ratio would be the faster of the two. Weight wouldn't matter as long as one is more efficient than the other. :idea:

[THOR]

What if it's a 6k cat and the other is a 3k non-step conventional vee (like a Sea Ray)? I guess the one with the lower slip ratio would be the faster of the two. Weight wouldn't matter as long as one is more efficient than the other. :idea:
So where is efficiency in the calculation? I think I missed that. :)

[BadKachina]

So where is efficiency in the calculation? I think I missed that. :)
That's what the slip is..................

[Throttle]

If he's not near the rev limiter, he needs less pitch, not more.
Bottom line, talk with a quality prop shop, and give them all they need know to prop you right suh as: engine, approx weight load, approx operating temp, elevetion, etc. They know there stuff, and will save you the expensive mistake of buying the wrong prop.
yeah, too many things in the fire earlier... you and shadow got me... :idea: is it possible that i was typing and not thinking ? maybe just not thinkin...

[dicudmore]

F'n smart ass.
I run a 26.5 and am very close to 80 on GPS.
hey I wasn't naming names in case the owner of said boat's insurance agent reads the forums :wink:

[Jake W2]

BadKachina I do have a 03 20 Baja Outlaw.The Mazco HP 4 comes blueprinted blanced ect for 600 and is SS.
www.mazcoprops.com
The pics are jets in my sig.
Jake

[THOR]

That's what the slip is..................
Sort of :cool:

[BadKachina]

BadKachina I do have a 03 20 Baja Outlaw.The Mazco HP 4 comes blueprinted blanced ect for 600 and is SS.
www.mazcoprops.com
The pics are jets in my sig.
Jake
That's a good price blueprinted and balanced.

[Jake W2]

Yea its not a bad price .Hot Boat had said these guys know outboards like no one else when they were prop testing an Allsion.You are rite it does say for step bottom and cats.My 20 bobbs like crazy so the lift really helped ,and the cruzing speed to RPM is great also.
Jake

[Biglue]

Great input guys. Thanks.
Lue.