prop concerns 90 etec

[perry barras]

Re: prop concerns 90 etec

This is after i lifted the motor huge difference.. 3.5" prop shaft to the pad

 

[perry barras]

Re: prop concerns 90 etec

Here the pictures side by side it doesnt look like it but the boat and the cal. Plate are level just different pic angles..

 

[jestor68]

Re: prop concerns 90 etec

Since your boat does not have a "pad bottom" , that setting might be too high.

 

[sublauxation]

Re: prop concerns 90 etec

This is after i lifted the motor huge difference.. 3.5" prop shaft to the pad



View attachment 179114

I'd also guess you may have to lower it a bit but never hurts to try. My hull is obviously different but my AV plate is probably about an inch lower than yours. I have a 17P aluminum prop that would break loose easily. The 15 pitch stainless has more cup (not sure if that is what makes the difference) but it rides nicely and wont break loose except on tight cornering.

 

[perry barras]

Re: prop concerns 90 etec

I'd also guess you may have to lower it a bit but never hurts to try. My hull is obviously different but my AV plate is probably about an inch lower than yours. I have a 17P aluminum prop that would break loose easily. The 15 pitch stainless has more cup (not sure if that is what makes the difference) but it rides nicely and wont break loose except on tight cornering.

im running a 19 pitch 13 7/8 wheel viper with cup. you have a pic of your boat? how long is it? aluminum hull?

 

[sublauxation]

Re: prop concerns 90 etec

im running a 19 pitch 13 7/8 wheel viper with cup. you have a pic of your boat? how long is it? aluminum hull?

No picks that show height. That jack plate will be nice. I modified my transom so I can't lower mine any more so I was really happy that the stainless prop got a good bite. I raised it about 1 1/2 inches from where it was originally set up and picked up a couple MPH and some RPMs. It's an 18ft aluminum v hull. I'm technically underpowered based on the hull's HP rating which is probably why I'm down to a 15 pitch prop vs your 19. I'm not sure which prop I have but it's an OMC part number bought used off EBAY. Lots of props on there if you're looking but like I said, you may be surprised at what happens if you fix your's and get the height dialed in. Then again owning extra props is fun. As somebody said, just make sure you're still picking up water for the cooling system.

All in all it's a great outboard, after 5 years I have no regrets at all. Are you still in the break in period?

 

[perry barras]

Re: prop concerns 90 etec

No picks that show height. That jack plate will be nice. I modified my transom so I can't lower mine any more so I was really happy that the stainless prop got a good bite. I raised it about 1 1/2 inches from where it was originally set up and picked up a couple MPH and some RPMs. It's an 18ft aluminum v hull. I'm technically underpowered based on the hull's HP rating which is probably why I'm down to a 15 pitch prop vs your 19. I'm not sure which prop I have but it's an OMC part number bought used off EBAY. Lots of props on there if you're looking but like I said, you may be surprised at what happens if you fix your's and get the height dialed in. Then again owning extra props is fun. As somebody said, just make sure you're still picking up water for the cooling system.

All in all it's a great outboard, after 5 years I have no regrets at all. Are you still in the break in period?

nope i have 71 hrs on it i fish alot lol........ id like to get it to 5500rpm wot though... im at wot 5100rpm so by lifting the motor higher i should pick up some rpms. but might lose some water pressure.. i guess its a cat and mouse game now.. might take it out to the launch friday and just keep adjusting the jp.

 

[perry barras]

Re: prop concerns 90 etec

who makes your hull?

 

[sublauxation]

Re: prop concerns 90 etec

It's an early 80's Sylvan. As for the water pressure coming out, at least mine has always been a pretty weak stream compared to other outboards I've seen so don't necessarily let that scare you into thinking it's mounted to high.

 

[82rude]

Re: prop concerns 90 etec

check out the evinrude website.all the boat tests i looked at for your motor show approx a max speed of around the high 30,s to very low 40,s .i think the dealer is full of it about the yamaha .im no expert but id think maybe a 17p might be about right.cant believe your dealer wouldnt throw in a new prop,mine (new 60 etec) threw in the prop plus rigging for free,plus a gallon of oil.also on the day i bought it evinrude went to a 6 year warrenty which is great also.

 

[trendsetter240]

Re: prop concerns 90 etec

check out the evinrude website.all the boat tests i looked at for your motor show approx a max speed of around the high 30,s to very low 40,s .i think the dealer is full of it about the yamaha .im no expert but id think maybe a 17p might be about right.cant believe your dealer wouldnt throw in a new prop,mine (new 60 etec) threw in the prop plus rigging for free,plus a gallon of oil.also on the day i bought it evinrude went to a 6 year warrenty which is great also.

X2 on what he said. Your setup as described in your original post is ideal for the i3 90hp etecs. Most owners and shops seem to recommend a WOT of 5200 RPM with an average load. Your speed is good too. I would keep the prop you have and enjoy your motor.

 

[perry barras]

Re: prop concerns 90 etec

check out the evinrude website.all the boat tests i looked at for your motor show approx a max speed of around the high 30,s to very low 40,s .i think the dealer is full of it about the yamaha .im no expert but id think maybe a 17p might be about right.cant believe your dealer wouldnt throw in a new prop,mine (new 60 etec) threw in the prop plus rigging for free,plus a gallon of oil.also on the day i bought it evinrude went to a 6 year warrenty which is great also.

i bought the boat from a place called the boat yard. in marrero la. they buy and sell bank repo boats. but they also sell alumacraft and "use to sell excel till after they sold me mine" excel found out that they are not a evinrude dealer so they shut them out long story " .. i seen a 21 footer excel there and i wanted excel. they ordered mine from the manufactuer it took month 1/2 to build it they pre rigged with motor . the boat new was $19,300 but i got everthing at cost boat 7500.00 reg. 8400.00 and the 90 etec 8100.00 reg 8900.00 aluminum trailer 1500.00 reg 2000.00 i and freight was 1,100 but i got that knock down to 300.00....I paid $17,400 plus TTL..... so for having a make shift dealer not throw in a prop and a battery was not gonna make or break this deal .. they gave me a month old battery which after a year has had no problems and they gave me that used viper s.s. prop. which wasnt in the deal i know if i went to a excel dealer up north yes i would have paid more for the boat and motor and would have gotten a brand new free prop and battery.. but i was on a budget i know the guy that sold me the rig for 12 years so he cut everthing he could ,but it costed me overtime to rigg it for fishing another 2500.00 . oh i forgot about the jack plate too 400.00 got it for 275.00 . thats my boat story yall.. lololol

 

[perry barras]

Re: prop concerns 90 etec

well i took the boat out and i ran wot 42mph at 5600rpm (5500 motor maximum) 19psi water pressure. oh and my anti cal. plate was on top of the water no porpoising . so im going to go out again sunday. lower the jp another 1" ill have feedback from that run .. if it runs the same at 42 mph or better?!?!?!? and get those rpm right at 5400 ill be happy and done with it.. oh and if 1" is too much im going fishing monday so i can always go up a 1/2 inch..

 

[perry barras]

Re: prop concerns 90 etec

took the boat out today .. 43 mph wot 5400 rpm 22 psi on water pressure . well i think its dialed in as best as its gonna get... new prop might pick up 1-2 mph..

 

[perry barras]

Re: prop concerns 90 etec

just got off the phone with my boat builder . he says i should be running a 17 wheel he said that for every inch back you can go up 1/2 up with the JP "my jp is a 6". he said they run 90 yamahas on the same hull i have and they run 43-44 wot @ 5500 rpms and they all run protech 17 pitch wheels . he said i might pick up more speed bc my motor is lighter and having the jp. too. what do you think ? the guy stressed to get rid of that prop he said that you have no clue what ya have buddy. he said that might have been a 19 pitch new but how many times has it be re-worked? what brand prop do you recommend ?



just got off the phone with proppeler technologies PowerTech Props For Sale | Stainless Steel Outboard Propellers Online at PtPropeller.com they said i should get a protech PTR 3 blade 17 pitch he gave me a price at 309.00 shipped!

 

[trendsetter240]

Re: prop concerns 90 etec

Your boat builder is full of it, sorry.

Your 90hp etec has a gear ratio of 2:1 and a recommended maximum RPM of 5200 at full throttle with an average load. In order to reach 44 MPH with a 17p prop you would need to run over 6000 RPM. That will kill your motor right quick if you run it like that.

As for the Yamaha's I don't know the gear ratio but assume 2:1. At 5500 RPM with 10% slip and a 17p prop the speed would be 39.8 MPH.

As for recommended prop brands I've always had good success with Solas. Both in aluminum and stainless steel. Check the prices here on iboats for props.

 

[perry barras]

Re: prop concerns 90 etec

just bought a ptr 18 pitch prop no change in rpm wot! id pay someone 500.00 to come down here just to prop my boat and set the jp!!!

Probably wouldn't cost much to get your current prop fixed and give it a try. As my dealer said 4500 to 5500 is the best range, sounds like you're doing good and fixing what you have may work great. Just for comparison I have a 1500lb aluminum with a 90 etec and I get 44mph with a 13 1/4 x 15 stainless at 5500 RPM.

Nice boat by the way!

 

[trendsetter240]

Re: prop concerns 90 etec

just bought a ptr 18 pitch prop no change in rpm wot! id pay someone 500.00 to come down here just to prop my boat and set the jp!!!

What is it exactly that you are looking for in a prop? Top speed? Mid range cruise? Hole shot?

 

[perry barras]

Re: prop concerns 90 etec

i want the boat to run at 40-42 at 5500 rpms. i want a decent hole shot and good top end

What is it exactly that you are looking for in a prop? Top speed? Mid range cruise? Hole shot?

 

[perry barras]

Re: prop concerns 90 etec

gonna call pt-props in the morning and get another prop sent over a 17 pitch with a slight cup. hope that works i dont think a 16 would even be in this question..