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Roller Cam Upgrade

Old 05-27-2009, 07:08 PM
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Hey Jeff,
Sounds like your getting close. What RPM did RMBuilder dial your cam in for? (Your max running RPM) Also regarding your dings in your prop. Some may disagree however in the past when wanting to gain 150 ot 200 Rs I would take a file to the cutting edge on the prop. Depending on the severity of your dings this may take them out also.
Don't be affraid to put a relatively sharp edge on it. If this didn't work for me I would never mention it however it has. The only down fall is the prop will nic/ding easier.
Good luck,
John
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Old 05-27-2009, 07:49 PM
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Originally Posted by getrdunn View Post
Hey Jeff,
Sounds like your getting close. What RPM did RMBuilder dial your cam in for? (Your max running RPM) Also regarding your dings in your prop. Some may disagree however in the past when wanting to gain 150 ot 200 Rs I would take a file to the cutting edge on the prop. Depending on the severity of your dings this may take them out also.
Don't be affraid to put a relatively sharp edge on it. If this didn't work for me I would never mention it however it has. The only down fall is the prop will nic/ding easier.
Good luck,
John
He said to prop for 5400 RPM. I was hitting 4900 with a heavy load and a dinged up prop. The damage was a little worse than it looked. They are actually going to have to weld a little metal back on the prop and set it back to spec. After blueprinting the props have a sharp edge and a mirror finish. I gained about 1.5 MPH over stock Mirage Plus. He thinks I had at least a 3MPH loss with the damage. Next time I test I will have 2 people and 1/2 tank of gas. That should put me a little closer to 5400.
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Old 05-27-2009, 10:54 PM
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I would guess that would put you near 5100.
Keep us posted.
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Old 05-28-2009, 09:51 AM
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Originally Posted by getrdunn View Post
I would guess that would put you near 5100.
Keep us posted.
With a light load I should get about 5200. It is fun to speculate. Testing on the water is better!
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Old 06-01-2009, 09:11 AM
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My 25 plus is in the shop and I will not get it back until thrursday. I took the boat out with my spair prop this weekend. The 21 Mirage was so quick out of the hole I was blowing away bass boats out of the hole. I had the rev limiter set at 5600 and ran 66 MPH. It got to top speed in a matter of seconds. Not good for top end but what a rush! I will try the 25 next weekend.
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Old 06-08-2009, 08:22 AM
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I tried the 25 Mirage yesterday and here are the results. I had about 30 gallons of fuel and just the wife and I in the boat. I got 69 MPH GPS at 4900-5000 RPM. I must have had a tail wind or a false reading when I hit 68 with a heavy load and damaged prop. The debate now is should I try a 23 Mirage? The 21 is way too small and the 25 is a little to big.
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Old 06-08-2009, 10:33 PM
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Definately try a 23. Jeff, with a single engine and normal load you will like it much better and put you closer to the RPM meant to be at. It's been a while however back when I ran my 24 Challenger I use to swap between a 23 and 25 Mirage and always like the pull and all around fun with the 23. I can assure you that this will be a good test and well worth the time and or expense. Of course try and borrow or test one first. Given your cam specs I would say you'll pick up 2 MPH / 300 - 400 RPM. Be sure and let us know.
John

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Old 06-09-2009, 08:52 AM
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I have asked around and none of my friends have a spair 23 Mirage. I don't want to ask somone for thier daily use prop. I would like to trade the 21 Mirage for a 23. I have it for sale on craigslist for $200. I was trying to recoupe the money for the repair on the 25. My outdrive is 8" deep, I am thinking about a Imco -2 Shortie for next winters project. Before I spend more money on props does anyone know if the Mirage will still perform well at 6"? I will also be custom fabricating a Ram air kit with (2) 4" inlets. This will also be a winter project.
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Old 06-09-2009, 12:13 PM
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Originally Posted by jeffswav View Post
I have asked around and none of my friends have a spair 23 Mirage. I don't want to ask somone for thier daily use prop. I would like to trade the 21 Mirage for a 23. I have it for sale on craigslist for $200. I was trying to recoupe the money for the repair on the 25. My outdrive is 8" deep, I am thinking about a Imco -2 Shortie for next winters project. Before I spend more money on props does anyone know if the Mirage will still perform well at 6"? I will also be custom fabricating a Ram air kit with (2) 4" inlets. This will also be a winter project.
If you can't come up with one locally (23P) be sure and let me know. I'm pretty sure I have one in GR. If you pay the shipping charges from and to I would be more than happy to ship you it. Otherwise I know many people that drive up almost every weekend from your area. Just let me know what you come up with.
John
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