Performance Revolution!

Lab Finished Revolution 4 Propeller.
Mercury Racing Lab Finished Revolution 4 Propeller.

I’m excited to share some awesome news regarding our Lab Finished Revolution 4 props. New 20-inch, 22-inch and 24-inch pitch offerings expand the range from 19-25-inch in one inch increments. The new models are producing exceptional results with the Mercury Verado 350 and our Verado 400R outboards. Multi- engine (trip, quad or quint) stepped bottom performance center consoles users are reporting improved planing performance, excellent mid-range punch and awesome top-end speeds.

Rev 4s were used to carry the load for 400R MTI V-42 demo rides in Miami.
Rev 4s were used to carry the load for 400R MTI V-42 demo rides in Miami. Photo courtesy of Poker Runs America magazine.

“Don’t tell anyone else about the new Lab Finished Rev 4s. I would prefer to maintain the distinct advantage they provide for our hulls,” quipped Randy Scism – president/owner of Marine Technology, Inc.  Randy personally helped me dial-in the new props.

Lab Finished, a registered trademark of Mercury Marine; is a process often imitated but never duplicated.

“We experienced an improvement in both acceleration and top-end speed when running the Lab Finished Rev 4s with Verado 350s and 400Rs on our V-42 center consoles. Dollar for dollar – your Rev 4s provide the best value on the market,” Randy said.

Mercury Racing® Lab Finished®  Our propeller technicians are second to none. They hand blend props for peak performance in both outboard and sterndrive applications. In fact – we were the first to provide the custom prop work and deem the process “Lab Finished”; a registered trademark of Mercury Marine.

Four Step Process:

• Blade surfaces are thinned in specific areas

• Modify leading edge

• Tune trailing cup heights

• Zero Balanced for maximum efficiency

Like many of our stainless steel through hub exhaust props, the Lab Finished Revolution 4s feature the Mercury patented Performance Vent System (PVS). PVS enables the user to fine tune the amount of venting needed for quick planing. The standard length exhaust tube, in addition to reducing the time-to-plane, also provides stern lift for maximum hull performance and an improved ride in a variety of conditions. I must admit I was  a bit nervous releasing this information about the new Rev 4s after hearing Randy’s plead. At least I didn’t reveal his preferred pitch. 🙂

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31 thoughts on “Performance Revolution!”

  1. Hi I already have a rev 4 pitch 21 in my triple 350 verado I can reach in full throttle 62 mph , is a 38 ft boat is a heavy boat , I want to try with a higher pith maybe 24 to have more top speed wich prop you recommend me the new rev4 lab finish or the bravo 1 FS i live in Venezuela and here we dont have chance to made a test , thanks and best regards

    1. Francisco,
      Depending on what rpms were reached at full throttle (62 mph), you might be able to go up to a 23″ or 24” pitch propeller. For example, to keep the same rpm at full throttle you might run a 22” pitch Lab Finished Rev 4 or 23” pitch Bravo I FS. If you could give up 150 more rpm then go with a 23” pitch Lab Finished Rev 4 or the 24” pitch Bravo I FS. I’m thinking the Bravo I FS will offer the most benefit.

    1. James,
      The Revolution 4 with its long tube offers a tremendous amount of stern lift and the massive amount of cup at the maximum diameter offers bow lift. The Bravo I FS accomplishes similar lift with a shorter barrel and lower cup at the maximum diameter. A unique feature of the Bravo I FS offers the opportunity to move up one or two inches of pitch achieving the same rpm as the lower pitch Revolution 4 which leads to increased speeds. Some center console boats just work better with the Revolution 4 and for other boats, the Bravo I FS offers the best performance. Much of the prop performance between the two styles depends on the boat bottom design, where the center of gravity is located as well as engine height.

  2. currently running a yarcraft tfx 219 with a 350 verado, Atlas jack plate. 23 pitch Bravo 1 fs.
    speed–63..5 mph
    jack plate up 1/4 inch from bottom
    What do you think the rev4 lab would do for me and what pitch would you recommend.

    1. Norm,
      I’d rather see you run the Bravo I FS or the new Bravo I LT. To achieve similar engine rpm, you would need to go to a 21″ pitch Rev 4. Your speed would suffer – dropping below 60 mph. Watch for a soon-to-be-released feature blog on the new Bravo I LT (Long Tube). We just finished testing with impressive results. The LT is designed for the bigger, wider, higher horsepower multi-species boats like yours. The longer tube offers a little quicker planing with improved mid-range fuel economy and 1 mph increase in top speed (pitch for pitch). For your setup, I would lean toward the 24″ pitch Bravo I LT. The engine rpm should come in around 6150 to 6200 and the speed may surprise you. The 24″ pitch Bravo I LT part number is 8M0121597.

  3. I have a 23 formula with a 2015 Mercury 225 pro xs it has a aluminum 17 pitch prop running 5700 rpms I’m interested in the revolution 4 or mirage plus which prop do you think would give me the most speed , I’m running 46 mph now

    1. Larry,
      Both are good props. To select one over the other, it depends on how your boat rides. The Mirage offers bow lift while the Revolution 4 offers stern lift. So, if your boat performs better with bow lift – you will want to go with the 3-blade. Pitch selection is going to be a challenge with these props. Going with 17” will result with a drop in engine speed by 200 to 300 rpm (too low). Consider the Enertia (not the ECO) in 16” or 17” pitch. It’s hard to make the call on pitch due to my not knowing the condition of your existing prop). The Enertia has a smaller diameter than the Mirage so the prop will offer quicker planing and the long barrel will keep the boat on plane at slower speeds. It will also provide good overall boat lift for enhanced mid-range cruising.

  4. I am running A Ranger 2510 bay boat with a Verado 350. Boat came through with a Rev 4 17 pitch and I am turning 6200 rpms with top speed 52.2. Overall performance is very good and I am basically pleased. I am looking for a little more speed, will a Bravo FS-1 or a REV 4 lab get me a little more top end without loosing my hole shot for my set up?

    1. Jack,
      Your set-up is doing really good. I’m not sure I would change a thing. The 20″ pitch is the lowest pitch Bravo I FS which is too much pitch for the Verado. The Lab Rev 4 typically works best for multi engine applications. Again, lowest pitch is 19”.

    1. Pat,
      I need some numbers to work up an answer. What engines did you have? what was the rpm and speed at WOT? what style props and pitch?

  5. I have a 2004 Baja 275 with 496 HO Mag running a revolution 4 labbed with 25″ pitch. It runs 69 mph at 4900 rpm. Can you recommend a prop with more top end?

    1. Pat,
      Can you supply the original horsepower, style and model year of engine you are removing? I will also need to know the pitch size of props you have used and the associated wide open throttle GPS speed and engine rpm.

  6. I have a 621FS Ranget that has a 300 hp ETec. With a Rev4 23 pitch I achieve 28 mph at 3600 rpm and 54 mph at 6000 rpm.

    What would happen with a Bravo I LT? What pitch?

    1. Steve,
      To run the Bravo I LT, usually a move up 2” of pitch from the stock Rev 4 to achieve similar engine rpm usually offers a speed gain of 1.5 mph. However, in your case, you may see a great deal more. The lare at the end of the barrel will offer more bow lift than the Rev 4.

  7. Scott,
    i just got a chance to run the 24 LT. Not very pleased with the finish on it as it seems to have most of the cup shaved off for balancing. The bow will not hold and it drops and scuffs the rpm and speed off.
    But in mid range at 3500 rpm’s , it gained another 2 mph over the 23.5.

    1. Norm,
      The Bravo I have has a different style of cup, nothing like the Tempest or the Revolution 4. Those props have a tremendous amount of cup at the maximum diameter. Balancing is done by removing material from the back side of propellers and cup height is adjusted for each one-half pitch increment. We make the 22”, 22.5”, 23” and 23.5” out of one casting so the 23.5” pitch would have the most cup. The 24”, 24.5”, 25”, and 25.5” are made from the same casting so the 24 would have the least amount of cup. If you liked the bow lift of the 23.5” but had 2 mph increase with the 24” pitch consider running the 24” pitch Bravo I FS. The Bravo I FS has the shortened tube which should offer you the bow lift and top speed your looking for.

      1. Scott,
        put a 24 Bravo 1 fs on it and with 2 people, full fuel, and full bait well up front, empty live well in back.
        WOT —- 6080 rpm
        speed —- 62.4
        This boat need a little cup to carry the front end up . The Lt prop would allow the nose to drop causing drag. Going to go back to the 23.5 LT and probably call it good. i actually seen 64.2 mph with that prop. ( low fuel, one person, 6″ chop). Maybe i could order a processor out of a 400R and a sportmaster gear case. That might get me where i want to be.

  8. Hello,
    I have a rib boat 6.00 meters stepped hull with 150 hp Mercury Fourstroke. I used to have Tempest Plus 19” and have the following measurements:

    Rpm Knots Slip

    2500 13,10 36,32%
    3000 19,50 21,01%
    3500 25,3 12,16%
    4000 30 8,86%
    4500 33,40 9,8%
    5000 37 10,07%
    5500 42 7,2%
    5900 45 7,31%

    I tried Rev 4 19”

    Rpm Knots Slip

    2500 14,30 30,46%
    3000 20 18,99%
    3500 24,80 13,86%
    4000 29,60 10,07%
    4500 33 10,88%
    5000 36 12,5%
    5500 40,5 10,52%
    5650 42 10,36% ( TRIM at 7)

    So i decided and i bought a Revolution 4 xp 18” to achieve 5800 rpm in wot as it happens:

    Rpm Knots Slip

    3000 19,4 17,05%
    3500 23 15,71%
    4000 27,60 11,49%
    4500 31,40 10,49%
    5000 35,50 8,93%
    5500 40,40 5,78%
    5840 43,20 5,50% (TRIM at 3,5)

    Unfortunatelly, the prop looses waters during accelaration and stern lift the boat a lot. The behavior changes dramatically, i have chine walking sooner and the boat is not behave well and trim until 4 in smart craft. i am thing to down the outboard one hall to catch water and have more trim. With rev 19” the behaviour was fantastic. Any suggestions?

    Best regards,


    1. George,
      The Rev 4 XP 18” pitch is made from the 19” pitch Rev 4 casting by lowering the cup height, it’s apparent your set up needs more cup than the 18” offers. IF you have a good local prop shop have them add a little cup from 6.5” radius to max diameter.

  9. Scott,

    I have a 2016 Glasstream 240 CC with a 250 Pro X/S mounted on a 4″ jackplate. I was running a 21″ Mirage Plus but wasn’t happy with the scary handling it yielded at speed. Recently got a loaner 21″ Rev 4 and was impressed. My goal is top speed. I was able to hit 57 mph at 5450 rpm with full fuel and just me onboard. What size would you recommend I try next in the standard and lab Rev 4? Or is there another prop you recommend?



    1. Hi Scott,

      Update to my prop trials. I was able to find a Rev 4 19″ demo prop. Surprisingly, I was only able to hit 55 at 5750. With the Rev 4 21″, I was at 57 at 5450. I’m going the wrong way. What’s going on?



    2. Dave,
      A little low in rpm for the light load, moving down to the 19” pitch Rev 4 should offer 300 rpm reaching 5750. Speed will probably drop 2 mph but you’ll be in the engines rpm range. The 19” Rev 4 XP should offer another 75-rpm increasing speed 1 mph.

  10. I run a 2015 21ft Nitro. 350 Verado. It came standard with the Brave 1. I currently run 57-60. I wonder if the new long tube bravo would be an upgrade?

    1. Eric,
      The ZV21 does work the best with the B1LT, most of the guys are running the 22.5” pitch.

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