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ashills

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Registered: 07/14/08
Posts: 81
Reply with quote  #1 

I am running a 2008 40hp, with stock aluminum prop.(13.5x15) WOT (5600rpm)

 

I would like to upgrade my prop, current prop is damaged. I typically just cruise and pull (wakeboarding, tubing, ect)

 

The boat is definitely stern heavy

 

So I was thinking either a Rouge or viper, qustion is what Size and pitch? Probably stick with 15 pitch.

 

What hub type do I need? (Can someone tell me what TBX is and if I need it)(Looks like it’s a shaft damage prohibiter, 40hp doesn't use this hub correct)

 

Thanks


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StarCraft Falcon 14ft
08 Evinrude E-Tec 40HP
MODEL # E40DPLSCB
SERIAL #: 05204719
torew

Gold Level Member 3-2010
Registered: 06/02/08
Posts: 2,132
Reply with quote  #2 
Would go for minimum 17", maybe even 19". I got higher rpms with a stainless 19" (Powertech RED) than with alu 17". Standard SST or Rogue, definitely not the Viper.
You need what they call the V4 hub, ~13 1/4 in diameter

ashills

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Registered: 07/14/08
Posts: 81
Reply with quote  #3 
Thanks

Is there a hub number that goes along with the E-tec 40hp, 33 or something.

Found a couple of rogues on ebay, they have a 15P 17P and 19P for 325 shipped.

Should i go for the 17 or 19?

__________________
StarCraft Falcon 14ft
08 Evinrude E-Tec 40HP
MODEL # E40DPLSCB
SERIAL #: 05204719
The_General

Registered: 04/08/10
Posts: 8
Reply with quote  #4 
I have a 40 tiller on a 16/52 Alweld semi-v.  I never ran my boat with the stock aluminum prop but I've ran it with 4 different pitch ss props.  Started with a 3 blade17 pitch no cup - RPM's way to high.  Next, tried a 4 blade 21 pitch no cup (only used a 21 b/c that was the only other prop the dealer had on hand at the time)- RPM's way too low.  Next, tried a 3 blade19 with med cup - RPM's still a little low.  Ended up with a 3 blade 17 with med cup - RPM's just about perfect.  I know every boat does not respond the same, but that was my experience.  Hope it helps.
ashills

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Registered: 07/14/08
Posts: 81
Reply with quote  #5 
Sounds like the 17 is the way to go.
Is the rule of thumb per 1" of prop lose XXX of RPM (100/150/200)?

Thanks

__________________
StarCraft Falcon 14ft
08 Evinrude E-Tec 40HP
MODEL # E40DPLSCB
SERIAL #: 05204719
The_General

Registered: 04/08/10
Posts: 8
Reply with quote  #6 
I've always been told that a 2" INCREASE in pitch (For example from a 21pitch to a 23pitch) typically results in a DECREASE of approximately 300-400 RPM.  That is the formula that the dealer used for my engine, but it was way off.  In my case, the 2" increase in pitch was a decrease of 600-700 RPM.  I would say to start off with a SS 17 pitch, and if it over revs, you can get with a prop shop with your specs, and they can cup the prop and get the engine running the correct RPM's.  With your setup though, your prop may not need any cup.  It took a lot of trial test runs to get mine lined out.  I was the first customer to buy a 40 E-TEC from this particular dealer, so the proper setup was new to them.  The only benefit in my case though was because I had just purchased the boat and motor new, the dealer ordered brand new props and let me test them til I was satisfied with a certain prop, and that was the only one I had to pay for. 
Huey

Moderator
Registered: 04/20/08
Posts: 8,260
Reply with quote  #7 
Hi Andy, yes a 17 inch Rogue would work well and you could also go up a hole, the only area where you might want a 15 inch is for your wake boarding. Your revs are/were good with the 15 inch alloy prop and all else being equal the Rogue turns about the same and going up to a 17 inch will decrease your RPM, as the General says, so be careful you do not fall out of the optimium area of 5400-5600 for your 40HP.

Mate, if I had to choose I would get a 15 inch because I could sacrifice a few KPH up top for good acceration when towing.

Cheers,

Huey.
ashills

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Registered: 07/14/08
Posts: 81
Reply with quote  #8 
I moved my engine up a hole and will do some testing this weekend. Report back later.

The power I have pulling someone out of the water now is quite good. My original thought was I could at least keep the power I have by going to a four blade and actually pick up a small amount of speed on the top end by going to a 4-blade 17"P prop.

~Andy


__________________
StarCraft Falcon 14ft
08 Evinrude E-Tec 40HP
MODEL # E40DPLSCB
SERIAL #: 05204719
Huey

Moderator
Registered: 04/20/08
Posts: 8,260
Reply with quote  #9 
Hi Andy, only way to know for sure mate is to try it, but I would try a 15 inch first.

Cheers,

Huey.
ashills

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Registered: 07/14/08
Posts: 81
Reply with quote  #10 
Can one of you guys run my numbers and tell me if there is an update for my engine.

Thanks
Evinrude E-Tec 40HP, MODEL # E40DPLSCB, SERIAL #: 05204719

__________________
StarCraft Falcon 14ft
08 Evinrude E-Tec 40HP
MODEL # E40DPLSCB
SERIAL #: 05204719
Huey

Moderator
Registered: 04/20/08
Posts: 8,260
Reply with quote  #11 
Hi Andy, the latest revision number for your engine is 2384 and no way of knowing what you have without putting her on the laptop.

Cheers,

Huey. 
ashills

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Registered: 07/14/08
Posts: 81
Reply with quote  #12 
To get back to my original post. Going up a hole did help, I am either where I need to be or very close. I think up one more hole would be too high.

Quick question what size prop wrench do I need for this 40hp e-tec?

I still haven't had a chance to test any other props yet. Hopefully next year I will be able to do more boating. I moved this last summer and my Grand parents cottage was sold two falls ago so i didn't get any boating in this last summer.

Next year I plan on boating more in a local river. (Grand River (West Michigan)) With this in mind I may not end up going to a stainless prop because of the much higher likely hood of damaging a prop.




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StarCraft Falcon 14ft
08 Evinrude E-Tec 40HP
MODEL # E40DPLSCB
SERIAL #: 05204719
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