312 props for 454mpi
#2
21 and 42 footers
Platinum Member
Had a 312 with the 502 mags. Spinning non-labbed 30's. I would think with 100HP less you won't be able to turn them up. What is your max RPM now? Your motors should only turn 4,400-4,600 RPMs if htey are the non-mag 454's.
#3
Gold Member
Gold Member
Thread Starter
Join Date: Jan 2007
Location: Tulsa, OK
Posts: 1,039
Likes: 0
Received 0 Likes
on
0 Posts
Its Right at 4650 wot 1/4 fuel 3 people, I have never ran a labbed prop before, I have heard before that if you go with a lab you can go up one pitch .With a lab and with the lower gears in those bravo's turning more torque, it might good to go. just another MPI guy dreaming here
#4
21 and 42 footers
Platinum Member
Labbing a prop will get the rpm's up usually around 200 RPM's. If your at 4,650 rpms now seems your right where you need to be. If you want more speed.....you need bigger motors!
what is your top speed anyway? My 502 mag 312 hit 73 on GPS (77-78 on the "dream-meter")
what is your top speed anyway? My 502 mag 312 hit 73 on GPS (77-78 on the "dream-meter")
#6
21 and 42 footers
Platinum Member
Try talking to the props gurus on the site but I think you've got all your gonna get. I had 105 HP per side more than you and saw 9 mph more on the best of days. Prop work might get you 1-2 more and for $1,500 for labbed props.....I don't think it's worth the gamble.
#8
Charter Member #415
Charter Member
Join Date: Nov 2000
Location: Jasper,Alabama
Posts: 3,357
Likes: 0
Received 0 Likes
on
0 Posts
Labbing props on Formulas is a waste of money in most cases and overall performance will suffer a little.Save your money,or spend it somewhere else. My 2 cents
#10
21 and 42 footers
Platinum Member
BTW: Do you want a spare bravo upper? I have one left in the garage I kept for my 312. Bought a drive that was only 2 weeks old after a guy hit something and twisted the lower. Pulled the upper gears and put them in a upper to have a spare.