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Originally Posted by Colbaltmania
(Post 3502159)
Yes BBlades is on my list. Also I thought that I had 28 props on my drive. It turns out they are 24. Must have been having one of those days when I checked em out. :drink:
I noticed on the rear prop, on the outer rim has a flat spot and is not totally round. I would guess this is whats causing my vibration when my boat has a load of people full cooler and tank of gass. |
Originally Posted by Colbaltmania
(Post 3502155)
I know the bravo 3 is faster than the bravo one up to 63 mph so I don't think my boat will be breaking this speed with my current stock 454 mag mpi. Im just trying to get close to the max speed performance of my outdrive.
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I have a 99 253.....
Originally Posted by dbkski
(Post 3502119)
According to my Cobalt manual you should be using a 26P propset for
your Bravo 3 with a 454 Mag MPI. The 502 Mag MPI used the 28P propsets. This is for the 252/253/25LS models. Which do you have? Also you really need to get an accurate tachometer, digital is best, before you do any more "testing" or make any changes. I went through this myself and found significant speed increases with the last 250 RPM's. |
The lower unit ratio looks like 1.8 R
Originally Posted by Knot 4 Me
(Post 3502207)
You should easily be able to pull a set of 26's. What is your outrdrive's gear ratio? Bravo III propsets are notorious for being out of balance straight out of the box. The pitch can also be inconsistant across all three blades.
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The B3 ratios for your year were 1.81 or 2.20.
Remember - get the tachometer first!!!! |
Originally Posted by Colbaltmania
(Post 3502848)
The lower unit ratio looks like 1.8 R
As mentioned above, first check your boat's tach against a shop tach or scan tool at WOT to verify its accuracy. If accurate, time to send those 24's off to be fixed/worked to be able to pull 5K at WOT. |
The 3x3 props should be faster than the 4x3 props although the 3x3 are more likely to have have prop burn.
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Just get the ding fixed, have them balanced, and enjoy the boat. Remember, cruising between 3000 - 4000 RPM is where you will spend most of your time. I would prop for max speed within that range. The rev limiter will kick in at 5100 RPM, and I don't think an extra 200 RPM will give you more than a MPH or two. Not worth the trouble and additional wear and tear on the engine.
If you try to hang with the guys on this forum, be ready to spend a lot of money and a lot of time standing on your head in the bilge! :D |
Yea I know all about the faster boats. Several of my friends have and had Pro Chargers. Dont want any of that expense or time hanging out in the bildge.:eek:
Originally Posted by Budman II
(Post 3503461)
Just get the ding fixed, have them balanced, and enjoy the boat. Remember, cruising between 3000 - 4000 RPM is where you will spend most of your time. I would prop for max speed within that range. The rev limiter will kick in at 5100 RPM, and I don't think an extra 200 RPM will give you more than a MPH or two. Not worth the trouble and additional wear and tear on the engine.
If you try to hang with the guys on this forum, be ready to spend a lot of money and a lot of time standing on your head in the bilge! :D |
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