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TOPIC: 1989 trophy 2459 5.8l recommended prop size and pitch

1989 trophy 2459 5.8l recommended prop size and pitch 13 Aug 2017 06:23 #1

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I just rebuilt 5.8l omc.030 over and upped the cam a little otherwise stock 24' hardtop with cobra drive. I have a 15x16 on the boat it came with but thinking not the best. any recommendations . First post. Thanks

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I live in Santa Cruz Ca
1989 trophy 2459 hardtop with omc 5.8L (5.97l now) fresh and closed cooling system w/ OMC cobra stern 15 Evinrude kicker.
I fish inshore rock, halibut, salmon and tuna within range. Fish Monterey and Half moon bay Calif. Had boat 15 years. Pretty handy.

1989 trophy 2459 5.8l recommended prop size and pitch 13 Aug 2017 21:08 #2

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My 5.7 gm (new base engine)is mated to a 5.0 geared cobra on an 89 2160. I currently run a three blade aluminum 15x17. It will redline over engine spec. if I let it. It needs a 19p at least to hook up the 5.7 properly. I'd start there at 15x19 three blade or 15x20p four blade.
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My boat shall rise like a wet phoenix (after I deplete all monetary resources).

1989 trophy 2459 5.8l recommended prop size and pitch 14 Aug 2017 01:09 #3

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I run a 15x17 on mine. WOT is 4600 RPM @ 35kts.

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"B on D C", is a 1989 2459 Trophy Offshore HT, OMC 5.7L, Cobra OD, Yamaha 15hp kicker. Lots of toys! I'm no mechanic, just a blue water sailer and woodworker who loves deep sea fishing.
MMSI: 367637220
HAM: KE7TTR
TDI tech diver
BoD, North Olympic Peninsula Puget Sound Anglers, Sequim, WA
Kevin
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1989 trophy 2459 5.8l recommended prop size and pitch 14 Aug 2017 04:07 #4

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man4fire wrote: I just rebuilt 5.8l omc.030 over and upped the cam a little otherwise stock 24' hardtop with cobra drive. I have a 15x16 on the boat it came with but thinking not the best. any recommendations . First post. Thanks


I run a 15 1/2 x 15, have tried others but this is the sweet spot. Your 15x16 is virtually apples to apples to mine so as long as it doesn't need to be serviced, you should be good.
That 5.8 has a sweet torque power band doesn't it ?
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" WET EVER "
1989 2459 TROPHY OFFSHORE 5.8L COBRA / SX
mmsi 338108404
mmsi 338124956
"I started with nothing and still have most of it left"

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It's only a rock, get over it.
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1989 trophy 2459 5.8l recommended prop size and pitch 14 Aug 2017 06:15 #5

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yes it pulls forever and hole shots well and it is fresh .030 over rebuild with a bit more cam. Never had too much time at WOT but would like to troll slower and cruise faster. Prop math eludes me. i know I have to get out this week and WOT a couple runs and come back to you all. Thanks. Not worried about the motor it will perform. I was thinking about a 19 but it may be to much pitch.

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I live in Santa Cruz Ca
1989 trophy 2459 hardtop with omc 5.8L (5.97l now) fresh and closed cooling system w/ OMC cobra stern 15 Evinrude kicker.
I fish inshore rock, halibut, salmon and tuna within range. Fish Monterey and Half moon bay Calif. Had boat 15 years. Pretty handy.

1989 trophy 2459 5.8l recommended prop size and pitch 14 Aug 2017 17:39 #6

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man4fire wrote: yes it pulls forever and hole shots well and it is fresh .030 over rebuild with a bit more cam. Never had too much time at WOT but would like to troll slower and cruise faster. Prop math eludes me. i know I have to get out this week and WOT a couple runs and come back to you all. Thanks. Not worried about the motor it will perform. I was thinking about a 19 but it may be to much pitch.


Yes, you will find a 19" to be way to tall for your load, I could(did) live with a 14-1/2 x 17 SS which I ran for awhile but the larger dia. and less pitch of the 15 1/2 x 15 gives more lift and less strain on the drive train.
I never need to "hammer it" to climb out, it will get on step with just nudging the throttle forward. I don't think I ever run much over 50% throttle, the conditions I run in don't allow for anything over 25 mph.
The last time I recall a WOT pull on flat water trimmed very loose, it was on it's way to 40 mph when pulled out. That was with the 17" SS

Did you by chance change your heads to GT40's ? Center riser manifolds ?

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" WET EVER "
1989 2459 TROPHY OFFSHORE 5.8L COBRA / SX
mmsi 338108404
mmsi 338124956
"I started with nothing and still have most of it left"

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It's only a rock, get over it.

1989 trophy 2459 5.8l recommended prop size and pitch 15 Aug 2017 03:32 #7

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The heads are the same had to go to center risers which caused a complete redesign and relocation of heat exchanger to above water pump. What a pain. Also shifted my 2 agm 110# batteries to just inside the cuddy centered to shift 220lbs weight forward and balanced the weight better. Taking it out tomorrow to see how it rides and hope it doesn't bounce so much.

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I live in Santa Cruz Ca
1989 trophy 2459 hardtop with omc 5.8L (5.97l now) fresh and closed cooling system w/ OMC cobra stern 15 Evinrude kicker.
I fish inshore rock, halibut, salmon and tuna within range. Fish Monterey and Half moon bay Calif. Had boat 15 years. Pretty handy.
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