Need help with no. 6 drives on 42 fountain
08-05-2009, 03:39 PM
#12
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The best I have seen is 104 mph @ 4900 elevation. Still trying out props from hering. Came with 37.5x17 6 blades. Bought a set of 35x17 6 blades, but think I need to go down to 33x17 6 blades. Need more rpm's.
08-05-2009, 05:21 PM
#13
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104mph is solid at elevation. I think the 33's will be way too small. There are four 42's with 700's on our lake. Three are running 37x17's. Mine is the odd-ball running 37.5x16.75, which are the same prop's they run on the 850sci boats. You should consider keeping the 37.5's and getting the Whipple ECU / pulley upgrade. It should pull those props another 800 rpm's and the boat will jump on plane.
08-06-2009, 10:55 AM
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I already have the whipple kit did that before I bought props. I am only turning about 5300 rpm that is why I wanted to know how much trim to give the boat. I can trim up the boat to get more rpm's but doesn't get any faster, so that is why I think I will try proping down. By the way I put the air tubes on my drives, now it jumps right up on plane. Do you have the drive tubes?
Last edited by bbaur32; 08-06-2009 at 10:59 AM.
08-06-2009, 10:51 PM
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No air tubes here. If you are turning 5300rpm's mid summer, you will probably hit the limiters in the spring and fall. I have not maxed mine out lately, but would expect a 5-8 mph loss mid summer.
