Ranger 374V prop?

[paulrodbender]

Wondering if anyone has gone through this. I have an 87 374V with a 88 Merc 150 XR4 which originally had the (smaller) 4 1/4" 1.78:1 gear case and now I installed a 4 3/4" 1.87:1 gear case and was wondering what the best prop might be? Also, running a 5" CMC jackplate. I was running a 13 1/2" x 24p four blade with 3/8" holes that I believe was worked on before I bought it 20 years ago or so but the hub is spun, so I can't really try that one to start. Before the gearcase swap I was running about 60 (gps) at 5600 rpm. Thanks in advance.

Paul

[Jtreed99]

The difference in fear case ratios you listed will make about 1” difference in pitch to hold the same rpm, however changing props manufacturers/styles will vary as much as that or more. That being said a large diameter 24” prop would put you a little over 63 mph assuming 10% slip with a 1.87 ratio at 5800 rpm so 24 is a good starting point.

[paulrodbender]

Thanks for the info..... a Trophy plus 24p ?

[Hez]

I have a '90 374v with a 175hp Mariner.

I spin a 25p Tempest (not a plus), the A45 model...which is supposedly a really light 25p.

Pretty sure I have a stock LU.

My top speeds are around 62 - 63 solo, light load...so I would say you are doing pretty good.

[paulrodbender]

Thanks Hez. I was doing pretty good until I needed to replace my lower unit and now my prop so I'm basically starting over at this point.

[Hez]

Thanks Hez. I was doing pretty good until I needed to replace my lower unit and now my prop so I'm basically starting over at this point.

I also have a 5" jackplate...I believe my PTP is about 4.25"....my boat seems to perform best with the motor a little deeper

[Hez]

Twitch, a user from up in your area has a 374v too...he might chime in with some input.

[paulrodbender]

Twitch, a user from up in your area has a 374v too...he might chime in with some input.

Thanks Hez. I already spoke with Al this week about this. He's running a 24 raker with no plate.

[Hez]

Thanks Hez. I already spoke with Al this week about this. He's running a 24 raker with no plate.

[agg5910]

I have a 1989 361V with same motor with small gear case with a Laser II 24p. I have been talking to Mark Croxton as I need to drop down in pitch. He told me the even number pitches were made for the smaller gear case and the odd pitch were for the large gear case...