As per our earlier conversation in the Pro Max prop section, I recently purchased a 32″ lab finished Pro Max, which has yet to be run. My question is about the PVS plugs: How do you insert them? And does using or not using them affect top speed? I’m not concerned about hole shot.
I tried tapping them in with a rubber mallet, then a hammer, then placing then in hot (tap) water for several minutes before inserting them, all to no avail. I was afraid I’d break the plastic if I used any more force.
I have my 300X gearcase centered about 1 1/2″ above the centerpod on my Stoker 22 Mod-VP hull, which causes the engine to rev up fairly high getting on plane anyway. I have an earlier 30” lab finished Pro Max without PVS holes, and I’ve used the Pro ET and Lightning ET over-hub exhaust props before and had no problems with any of them. So am wondering whether it will really make any difference whether the plugs are put in or left out in my application?
Thanks for your comments.
The venting system is designed to bring the boat on plane. At 70 mph, there’s 100 lb.ft of force applied to the gearcase/propeller, minimizing any exhaust escaping out the holes. The Pro Max’s small barrel enables the exhaust to flow through and over the barrel. This aerates the water around the propeller – similar to the what the PVS venting system does. With some applications, the gear ratio and taller pitch props require added aeration from the PVS vent holes. Installing the fittings can be tricky. Place the propeller on a work bench. Align the tapered side of the fitting over the PVS hole and hit the fitting squarely and forcibly with a plastic hammer.
I have a 1996 Bullet 2oxd which prop should I run on 2016 250 pro XS for fishing load and speed. Promax or bravo 1 xs. Motor is even wid the pad.
If you are looking for all around balance, consider the Bravo XS. The design of the prop will help carry the weight of the boat when you are loaded up. The Promax is designed with mainly top end speed in mind. For further help with your setup, it may be beneficial to contact Glenn Reynolds at Reynold’s Racing. He has a wealth of knowledge on Bullets and how to set them up. Here is their phone number: (865) 882-9623
Hello, i have a 30 Et 4 blade prop…..en i wanne buy a new prop…the mercury pro max 4 blade…………….but noboddy wasnt to tell me the difference between the 2 …esspeciasly…if i now have as 30 Pitch ET…do i need also as 30 pitch mercury pro Max…?
please give me asn anaser becauase i cald mercury heasdqwuasrter in begium, but the dit not kow thast..!@!@!@!!!!
The Pro Max props have the same blades as the Pro ET; we added the barrel to assist planing and hooking up better in turns. Run pitch for pitch.
I have a 2017 208 tyee GL with a verado pro 300 just bought a Bravo 1 LT 20.5 is this the best prop for top speed, PVS holes are pluged how do these affect top speed
Run the Bravo I LT and record rpm, top speed, and engine height, if you would like to make changes in performance we would start from there. The vent holes are for added planing performance and do not affect top speed. Especially on two-stroke outboards, removing the pvs plugs will cause air to flow both through the barrel and around the prop, making it spin up quicker.
engine height 2″ , 6000rpm , 60mph if you need anything more just let me know
You’re getting awesome performance. Don’t change a thing.
I am looking for some prop advice. I have owned a 21 foot race/ski type boat for about 12 months, similar to the Nordic, or Force Boats in Australia. It is partnered with a Mercury Verado Pro 300hp. I have been having hole shot issues with it since I purchased it. The boat weighs about 1900 pds, hull only, is 21foot long and a 21 degree deadrise. The boat is mainly a social ski boat, but I also use it for days out in the bay.
After testing many props, I have settled on the Vensura 4 blade in 19p.
I have also been playing around with engine height, and have added wedges. Both have improved hole shot significantly. I have found that the higher I lift the engine, the better the hole shot, however it is now cavitating. I am in the middle of moving the 200l fuel tank forward about 2 foot and am about to add a hydraulic jacking plate.
I am still looking for a better hole shot when pulling skiers. The hole shot is now pretty good when pulling a single 165lb skier, but starts to struggle when pulling a 250lb skier, or two heavy skiers.
What prop should I be looking at. Should I just go down in pitch to something like a 17p Vensura, or change to a larger diameter prop such as the Bravo 1FS, and if so, what pitch, or another prop. This is primarily a social ski boat, so speed is really of no concern. I am also happy to look at two props, one for skiing, and the second for cruising the bay. The current 19p vensura will hit the rev limiter (only just) at 6480 revs at 65Mph.
You may just have to step down to the 17” Vensura. Unfortunately, it can be hard to find. Mercury no longer is making the Vensura line. I hope you get a chance to try the 19” or 19.5” pitch Bravo I LT (contact Brainerd Propeller for their test program). Consider taking out (2) vent fittings to aerate the water around the propeller during planing.
Thanks Scott, I am in Australia so the test programs are few and fast between, but I will try and find a Bravo prop to try. Is it worth trying a High Five. I tried a High Five before the engine height was lifted and the before the wedges, and it was definitely the best Waterski prop, however very few people recommended the high Five for such a large hp engine.
I tried lots of props before the engine height and wedges were corrected thinking it was all a prop issue, however the engine height and wedges changed the characteristics of the hole shop dramatically, so now need to do some propping again.
If you can get your hands on a High Five – give it a whirl. Good luck.
I currently have a fury 3 blade on a 20 foot Lake &and Bay (no pocket) boca grande Flats boat with a 250pro/torque master . I am considering a lightning et, or the Fury 4 blade. Looking for more speed… Big surprise there. Please recommend a propeller for me with Pitch.
The ET is a fast prop but your on-plane performance will be different. Consider the Bravo I XS which is 2″ taller than the Fury. You will want to raise the engine at least 3/4″.
I have a 2007 20 ft lake and bay boca grande with a 2017 250 pro xs I have setback and my jack plate only moves 6-8 inches looking for max top end at 6g with a little hole shot
I have a bullet 21 SST with 300XS with a 1.62:1 gear ratio. What prop would you recommend? Medium to heavy load , i was thinking about pro max .
The Pro Max first; followed by the Bravo I XS (which is geared toward the heavier loads). Seek out advice from Glenn Reynolds at Reynolds Racing; 865-882-9623.
I am running a Pathfinder 2300 HPS with a Yamaha 250 SHO. I ran a Rev4/23p and could only get around 5600 RPM and 61.4 MPH, with a very sluggish hole shot. I ran a Bravo 1 XS in 22p and was on plane in a boat length and 2.7 seconds. I hit 6100 RPM and 62.2 MPH shortly after planning. I trimmed up a little less than 1/2 way and ran the jack plate at 2″ up. I was very light on fuel, but had 4 batteries and a trolling motor while testing. I loved the feel of the Bravo 1 FS, but think I should maybe look at it in 24p (I think 23p is perfect, but heard they’re made from the even numbers and vary a lot. Any truth to that?). I know the 24p would drop the RPM down to 58-5900, but am considering the impact while loaded with fuel and people. I read above that the XS is designed for heavier loads, but…? MY boat dry, with the SHO is 3,100 lbs. I’m ready to buy, but want to be dialed in this time around. My local guy (Ken @ Prop Gods) doesn’t have any FS props in stock for testing.
Thank you for the data on your setup, sounds like a fun boat! When discussing differences in the Bravo family, we are talking about the length of the barrel and vent holes that are cut into the barrel for venting out exhaust. The Bravo XS family has an additional four vent holes cut into the barrel for better planing in two stroke and heavy load applications. These holes are not necessary for your Yamaha application, but some benefit from the availability of half-pitch increments. The prop you are referring to for heavier loads would be the Bravo LT, with its longer barrel length, it will carry more weight with ease. But, with your minimal use of trim, it sounds like your boat is generating enough lift with a standard barrel length Bravo. I think you are right on the money with considering the 23 pitch Bravo FS for all around performance at 5950 to 6000 but if you want top speed go with the 24 pitch with rpm’s coming in around 5800 to 5850.
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