IMCO SCX4 Upper
07-14-2018, 08:11 PM
#2
I don't believe they will interchange. They have a different bolt pattern mating to the lower.
You can bolt a standard IMCO lower to an SCX upper with an adapter for the vertical shaft.
You cant do that for the SCX4 upper.
You can bolt a standard IMCO lower to an SCX upper with an adapter for the vertical shaft.
You cant do that for the SCX4 upper.
07-14-2018, 08:29 PM
#5
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i have a 26 daytona. Prop height is 1 1/4" above the lowest point of the sponsons. Im running a -2 scx lower with a cleaver. I need to either change entire drive and raise the x dimension a few more inches so i can surface the drive or stay with my upper and go back to a sc lower with a bravo prop. You are correct its a different bolt pattern. Im open to trade my complete imco scx upper and lower for a complete scx4.
07-14-2018, 08:32 PM
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i can also run a -3 sc lower and bring the prop shaft up 1". How is your boat running with that set-up. What boat, motor, and drive ratio? Speed?
07-14-2018, 09:08 PM
#7
I have a 2001 26. I am running 800+ HP, I have been running a labbed BRAVO 28. Drive is 1.36 ratio.
I had to modify the drive for more negative trim to get on plane.
112 MPH
I had to modify the drive for more negative trim to get on plane.
112 MPH
07-14-2018, 10:17 PM
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Those are good numbers. Have your tried a 5 blade? That will help get you on plane. Are you still 2" above the bottom? Im thinking the boat should run 110+ with the 1.34 and a 5 blade maximus.
07-15-2018, 09:47 PM
#9
I tried a stock Maximus 26 and it did plane better but not a lot better.
The boat didn't like the 5 blade even with the bell cut off. I had SO much transom lift that I couldn't get the bow to fly. Top speed was 94 MPH and the boat was riding on the bow and the prop.
At 94 I cut the throttle and it was as if I had slammed on the brakes. The cooler dumped over and everything slid forward.
Even with the 4 blade I have a 4% slip ratio.
Yes I am still at 2 inches above.
that is where the factory told me to put it. They said I would have trouble getting on plane but with the right prop it was do able.
I don't have problems with the labbed bravo 4 blade - it just takes a little longer than with the prop at 1 inch below.
I went from low 90's with 650 HP to 112 anytime with 800 HP
The boat didn't like the 5 blade even with the bell cut off. I had SO much transom lift that I couldn't get the bow to fly. Top speed was 94 MPH and the boat was riding on the bow and the prop.
At 94 I cut the throttle and it was as if I had slammed on the brakes. The cooler dumped over and everything slid forward.
Even with the 4 blade I have a 4% slip ratio.
Yes I am still at 2 inches above.
that is where the factory told me to put it. They said I would have trouble getting on plane but with the right prop it was do able.
I don't have problems with the labbed bravo 4 blade - it just takes a little longer than with the prop at 1 inch below.
I went from low 90's with 650 HP to 112 anytime with 800 HP
Last edited by Tinkerer; 07-15-2018 at 09:54 PM.
