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Old 10-03-2018, 10:29 PM
surfskier75 surfskier75 is offline
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Boat: 2005 MariStar 245 SS 6.0L Crusader. Previous boat: 1989 Mirage Intimidator 270 with twin 350 Magnums
Location: Southern MD
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MariStar 245 Prop Recommendation Wanted

I'm looking for a prop recommendation for my MariStar 245SS with the 6.0L. It's usually just my wife, my 5.5 y/o son, and myself with no ballast and not much gear. We typically take the boat on several mile trips to go eat at restaurants on the water, so we're looking for something that will give the boat a lot more legs than it currently has. The current prop is a 13.7 x 17.5 and at WOT I'm running around 38 mph at 5,400 rpm. At 3,000 rpm, I'm only going at 20 mph (statute miles). I'd like something that could get me up into the mid 40 mph top end and be able to cruise at 30 mph at 3,000-3,500 rpm if possible. I'm also running in brackish water with bottom paint if that makes a difference.
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Old 10-04-2018, 08:01 AM
88 PS190 88 PS190 is offline
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Boat: 1988 MC Prostar 190, 351 Ford
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Eric with OJ should be along. I believe the 812 is the usual suspect. Bigger diameter shallower pitch. Should do you right.
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Old 10-04-2018, 08:40 AM
EJ OJPROP's Avatar
EJ OJPROP EJ OJPROP is offline
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812 is correct, you guys really don't need me to chime in much anymore!
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Old 10-05-2018, 09:24 AM
88 PS190 88 PS190 is offline
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Of course we do!

Like for his boat would he get better top speed with an 805?
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Old 10-07-2018, 09:08 PM
surfskier75 surfskier75 is offline
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Join Date: Aug 2017
Boat: 2005 MariStar 245 SS 6.0L Crusader. Previous boat: 1989 Mirage Intimidator 270 with twin 350 Magnums
Location: Southern MD
Posts: 90
I finally got the boat in the water with an 812 on it. Unfortunately it appears that the 812 will not work with my boat. I could not get over 4,000 rpm without it cavitating. I eased into the throttle and started off at 3,000 rpm and went up in 500 rpm increments. Once I tried to go above 4,000 rpm, that's when the cavitation started. Even holding at just under 4,000 rpm, any slight turn also caused the prop to cavitate. This occurred with the trim tab up and down.

Any thoughts on if I need to go to a bigger pitch with the large diameter, or go back to a smaller diameter with an even larger pitch? I was reading through the 2006 Mastercraft Owners manual and saw the 6.0L MariStar 245/X45 came with a 13.7 x 19.5 vs my original 13.7 x 17.5. I also see that the 8.1L came with a 14.5 x 22! So I'm thinking maybe I need something with more pitch, and perhaps more diameter?
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Old 10-08-2018, 09:39 AM
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Give me a call to discuss.
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