29 outlaw with twin 7.4 vs. Twin sbc
08-09-2011, 03:16 PM
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I think this is more an issue of weight than HP in a 29. The BB's will weigh at least a couple hundred pounds more than the SB's. In a 29 this will have an effect on hole shot and I wouldn't expect more that 1-2 maybe 3 MPH more top end with BB's.
My 292 has twin SB's (6.2 MPI) 320 HP a side and runs 70 MPH.
My 292 has twin SB's (6.2 MPI) 320 HP a side and runs 70 MPH.
08-09-2011, 04:16 PM
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I would say you don't see much in the top end at all. maybe 1 mph if any. Hole shot will be better with the 7,4's. Much more low end grunt. The weight diff. should be 240 lbs. in all.
08-11-2011, 06:59 AM
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08-11-2011, 08:43 AM
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Mine was a '99 efi. Not real sure of cruise speed and rpm. I knew I wasn't going to win any races. Only had it a year. I usually ran it 37-3800. Id guess just under, or at 50.
08-11-2011, 08:46 AM
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Thats what I would have guessed. Dad's with the 25" props ran 49 at 3500 rpm. Mine with 26" 4 blades and 496 mags only runs 47 - 48 at 3500 for some reason.
08-12-2011, 03:03 AM
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08-12-2011, 06:55 AM
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You should try a set of Revolution4 25". More bowlift. Remember your 26" B1's are more like 25's, and run flatter than Rev4's and M+'s. 15,25" dia. is also alot of prop to turn with the mild power of the 496MAG's.
