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Mercury Revolution 4 project prop.

Old 10-04-2012, 06:48 PM
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Default Mercury Revolution 4 project prop.

I have wanting to do some testing with modifying a Rev4 for some time. I found a great deal on a super clean used 19 Rev4 and grabbed it for the test subject.

PropGods has offered to test a bone stock Rev4 side by side after each mod made for comparison.

Phase 1:
The first modification was to shorten the tube by 1". This will increase bow lift. The job took about 20 minutes with a cut off wheel and then I cleaned it up with an angle grinder. Came out looking like a pro did it if I do say so myself.

I will post performance data as soon as we test this with a stock Rev4 back to back.
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Old 10-04-2012, 06:53 PM
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Im running A rev4, 19. On a single 250HO. On a 26ft. Cant wait to see results.
Old 10-04-2012, 06:57 PM
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Phase II will be a back cut that Rich at Leading Edge Propeller does to the Rev4. If you have questions about the back cut, ask Ken at Propgods who can provide more info.
Old 10-04-2012, 07:14 PM
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Cool project. I assume you are testing results on a single engine performance boat? What are your goals? Higher top end? Better fuel economy? Hole shot?
Old 10-04-2012, 07:16 PM
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Testing on my Fountain 23. I would like all of the above!
Old 10-04-2012, 07:20 PM
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have been doing the tube cut on the rev4 for the yellowfin bay and pathfinder 22. yields a lot more bow lift, a little more speed, no loss in cruise. i did cuts in 1/4" increments though until it was too far- the boat will get overly loose when trimmed out.
Old 10-04-2012, 07:43 PM
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What did you cut it with?
Old 10-04-2012, 07:52 PM
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Shortening the exhaust tube of a propeller is a common modification among the go-fast crowd.

The exhaust tube acts as a planing surface, lifting the stern when the propeller shaft is angled below the level of the water. By shortening it, you reduce that surface area and the stern is allowed to settle deeper into the water, thus lifting the bow.

The danger is that at slower speeds, the exhaust gases have an easier time ventilating the blades. This is less of a concern on boats where top speed is the priority because the higher the boat speed the more the exhaust is swept away. This is also why really fast boats can use over-the-hub propellers.
Old 10-04-2012, 08:53 PM
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Originally Posted by Dorado34698 View Post
What did you cut it with?
4" angle grinder with a cutoff wheel then swapped to a sanding disk to finish.
Old 10-16-2012, 04:28 PM
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Results PLEASE!!!!
I just bought a used REV4 for my boat. I love it. Its a 21" which is a little big for my boat. Thinking about getting it cut so I can get more rpm's out of it.
I cant wait to see the results!!!! Are you going to post the #'s after each phase??
Old 10-16-2012, 04:32 PM
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when and where are you going to test?
Old 10-16-2012, 04:34 PM
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Originally Posted by nate. View Post
when and where are you going to test?

In a no wake zone

Have not had a chance to run it yet...stay tuned!
Old 10-16-2012, 04:36 PM
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gimme a heads up. if its cool with you id like to come and run it too. i had a back cut 19 rev4 on my boat for 2 minutes. it had no where near enough bow lift.
Old 10-16-2012, 04:41 PM
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When you are done cutting, you will need to passivate the metal to prevent excessive rusting.
Old 11-07-2012, 06:57 AM
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Any updates????
Old 11-08-2012, 06:12 PM
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Neat Chris. Looking forward to hearing water test numbers. We are boating Sunday if you'd like to test I could get a running video for ya.
Old 11-08-2012, 06:15 PM
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I talked to Ken from PropGods today and he just sent out his 19 Rev4. I need to coordinate it with him.
Maybe I will come out Sunday though.
Old 11-08-2012, 06:49 PM
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Originally Posted by Iep View Post
When you are done cutting, you will need to passivate the metal to prevent excessive rusting.
Steps?

Cheers,
GFS
Old 11-08-2012, 09:18 PM
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Originally Posted by gofastsandman View Post
Steps?

Cheers,
GFS
A good polish of the cut will suffice.
Old 11-09-2012, 08:42 AM
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Interested to see how this goes, I have a pair of Rev 4's sitting around that I'd love to mess with.

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