242ls scorpion377 best prop?
11-09-2014 | 03:10 PM
#11
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Joined: Mar 2009
Posts: 386
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From: Beaverton Or
I will try to post some pics soon, its a merc racing scorpion so it is 377 hp at crankshaft, i wont have alot of testing left since my boat is almost the only one still in the water over here in belgium.
the enertia props are by far the best i have tested but they only make them to 22p.
another problem i have is that all the other props are very hard on steering its a single ram full hydraulic system.
with the apollo i cant turn the steering wheel at all at full speed.
appollo 4 blade 22p: 55mph at 5350 rpm bad holeshot cruising a bit faster
Mirage plus 23: 55.5 at 4950 bad holeshot and cavitating on turns
Ballistic 22xl: 56 at 5100 acceptable holeshot and cruising but still hard on steering
Enertia 21: 57 at 5350 good holeshot and cruising and best topspeed but still 150 rpm over redline
strange thing is here my prop slip on the previous engine 6.2 mpi was 8 percent with a enertia 17p and now with the 21 it has 19 percent so thats a big difference.
i was told to try an powertech ofs3 23p so i will try that next i think
Cavitation plate is mounted 1.5 inch above the bottom of the hull
the enertia props are by far the best i have tested but they only make them to 22p.
another problem i have is that all the other props are very hard on steering its a single ram full hydraulic system.
with the apollo i cant turn the steering wheel at all at full speed.
appollo 4 blade 22p: 55mph at 5350 rpm bad holeshot cruising a bit faster
Mirage plus 23: 55.5 at 4950 bad holeshot and cavitating on turns
Ballistic 22xl: 56 at 5100 acceptable holeshot and cruising but still hard on steering
Enertia 21: 57 at 5350 good holeshot and cruising and best topspeed but still 150 rpm over redline
strange thing is here my prop slip on the previous engine 6.2 mpi was 8 percent with a enertia 17p and now with the 21 it has 19 percent so thats a big difference.
i was told to try an powertech ofs3 23p so i will try that next i think
Cavitation plate is mounted 1.5 inch above the bottom of the hull
Go to that site and notice how the diameter change's as you change pitch small dia usally on a heavier boat is not always the best.
Enertia 17 Pitch (14-1/2x17) LH X7 SS 3 BL Mercury Propeller 898995A46
Enertia 21 Pitch (13-5/8x21) LH X7 SS 3 BL Mercury Propeller 899003A46
01-18-2015 | 02:22 AM
#15
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Joined: Feb 2010
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I did a trade in with my 6.2 mpi, the scorpion is one of the last ones built and was used as a spare engine, it has 10 hours from running it each year on the stand. it was never installed in a boat, it is not a big difference in propshaft hp on paper but a very big difference in performance with that black 6.2. Another 3 months and prop testing can begin again.
