prop and speed for 24ls
04-01-2011, 06:39 PM
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prop and speed for 24ls
I Just pick up a 24ls. 454/330 slightly modified probably around 350hp. I just wondering what prop I should be using and what kind of top end I should expect. anyone with a similar setup have any input. would like to squeeze the most out of the top end.
thanks
Dennis
thanks
Dennis
04-01-2011, 06:44 PM
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I had a 88 242ls with the 454/365hp mag, turned a 21p mirage plus at 59.8 mph really light on fuel bye myself
04-02-2011, 02:13 PM
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The difference between 330 hp and 350 hp in a 242 would most likey be the same or maybe 1-2 mph increase. The real GPS speed should be around 53 mph. Speedo speed could be way different. The Mag boats are around 56 MPH GPS. A 21 pitch is most likely the right prop. I have around 530 hp and I see flat water speeds of around 61-62 and around 64 with some chop. My speeds however are with a mirage prop that is in bad shape.. I'm now going to be using a new Mirage plus so speeds should increase a bit.
Either way 242 are great boats, that ride very well, but they are not speed demons and need a lot of power.
Either way 242 are great boats, that ride very well, but they are not speed demons and need a lot of power.
04-03-2011, 06:54 AM
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thanks for the info
The difference between 330 hp and 350 hp in a 242 would most likey be the same or maybe 1-2 mph increase. The real GPS speed should be around 53 mph. Speedo speed could be way different. The Mag boats are around 56 MPH GPS. A 21 pitch is most likely the right prop. I have around 530 hp and I see flat water speeds of around 61-62 and around 64 with some chop. My speeds however are with a mirage prop that is in bad shape.. I'm now going to be using a new Mirage plus so speeds should increase a bit.
Either way 242 are great boats, that ride very well, but they are not speed demons and need a lot of power.
Either way 242 are great boats, that ride very well, but they are not speed demons and need a lot of power.
04-06-2011, 05:17 PM
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We have a 232 bowrider with the 454 mag that just spent the winter being redone. Block is .030 over with little different cam , pistons and light port work, removed silent thunder for thru hull, spinning a 21 mirage in no particularly special shape and did 64.7 in choppy lake water on GPS. Cant wait to see what she does on a glassy morning.......70 would be crazy in our little BR but am stoked to see what it does now !!
Last edited by scagle1; 04-06-2011 at 05:20 PM.
05-06-2011, 07:56 AM
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242 prop
So have any of you new 502 powered guys run yet? I have and only ran 48 at 4500 rpm with a full tank and 3 people. The prop is a Tempest Plus 25. It was cavitating severely on acceleration. The factory shows 61.4 MPH @ 4800 with a Mirage 23, 502, 390 hp. see attached.
I'm tuning the motor now and will try again.
What props, speed, rpm have you been getting?
Thanks
Eric
1990 242SS 502
I'm tuning the motor now and will try again.
What props, speed, rpm have you been getting?
Thanks
Eric
1990 242SS 502
I gained 10 MPH, the boat now handled well, carves turns with stability and without falling off plane and planes at a lower speed, around 22 mph. No more cavitation.
Now to find a new, hotter motor........
05-20-2011, 10:12 PM
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Bigger Props?
Just tested my 242LS with twin 350s after upgrading the intake manifolds and carburetors from 2 to 4 barrels - previous top speed was 56.0 GPS (on 1 ft chop, ocean) @ 4700 RPM. Tonight, I hit 58.4 GPS @ 5100 RPM on a fresh water lake. I'm hoping that translates to 60 in the ocean. Will find out next weekend.
The RPM sounds high for these engines, so I think I may increase the prop size a little. I currently have 13 7/8th, 21P 3 blade Quicksilver Lasers. What prop size/pitch do you guys recommend? My wife will love it if I need to order a couple of new props!
The RPM sounds high for these engines, so I think I may increase the prop size a little. I currently have 13 7/8th, 21P 3 blade Quicksilver Lasers. What prop size/pitch do you guys recommend? My wife will love it if I need to order a couple of new props!
