war eagle predator + ETEC 115 PROP question?

[zwalls]

I presently have a viper13 7/8"x 19" SS prop on the engine now.engine is the right height and max RPM's are about 5700.I have a friend with exact same boat and setup but a different 115 motor and leaves me behind!!he's running a laser II 13.5x21 SS. thinking about trying this prop to see if it will perform the same for me or mayabe a 13.25x21 may work a little better?
any prop guru's have any advice?

thanks

Z

 

[steelespike]

Re: war eagle predator + ETEC 115 PROP question?

Speaking very generally a 21" pitch will go 2" farther each revolution.
Disregarding slip, drag and exact ratio Thats about 5,000 inches a minute.I would think he would out run you but I have a feeling you have a better hole shot now.
What rpm is he running?
How do you know the height is right?Are you on the ragged edge of ventilation?
I can't help much with your selection but someone here should be able to help.
The guys at scream and fly should be able to help.

 

[zwalls]

Re: war eagle predator + ETEC 115 PROP question?

Speaking very generally a 21" pitch will go 2" farther each revolution.
Disregarding slip, drag and exact ratio Thats about 5,000 inches a minute.I would think he would out run you but I have a feeling you have a better hole shot now.
What rpm is he running?
How do you know the height is right?Are you on the ragged edge of ventilation?
I can't help much with your selection but someone here should be able to help.
The guys at scream and fly should be able to help.

I understand the difference between pitch but I'm less familiar with what role diamater plays!!belive it or not our whole shots are pretty equal.at WOT he can turn about 6000rpm's.
my AV plate is just above the surface of the water not beneath!I don't think I'm on the edge of ventilation right now!

thanks for your input!!

Z

 

[steelespike]

Re: war eagle predator + ETEC 115 PROP question?

What are you so excited about!!! All I suggested was maybe your motor could be higher.
If your not on the edge of venting your motor may need to be higher though at this point
may not gain much.
Diameter is a secondary consideration in prop selection.
a 1/4' decrease in diameter results would be hard to measure.
Again speaking very generally less diameter might produce more rpm.
But diameter rpm results depend on the manufacturers design technology.
imo a 1/4" larger prop may resist venting better than the smaller prop.
I think I would be trying the exact prop your buddy has.
In looking at a bunch of etec tests 17" and 19" props seem to be the norm
your boats must be pretty light and fast.
There aren't too many motors that can match the etec hole shot.

 

[zwalls]

Re: war eagle predator + ETEC 115 PROP question?

What are you so excited about!!! All I suggested was maybe your motor could be higher.
If your not on the edge of venting your motor may need to be higher though at this point
may not gain much.
Diameter is a secondary consideration in prop selection.
a 1/4' decrease in diameter results would be hard to measure.
Again speaking very generally less diameter might produce more rpm.
But diameter rpm results depend on the manufacturers design technology.
imo a 1/4" larger prop may resist venting better than the smaller prop.
I think I would be trying the exact prop your buddy has.
In looking at a bunch of etec tests 17" and 19" props seem to be the norm
your boats must be pretty light and fast.
There aren't too many motors that can match the etec hole shot.

uuh,I don't know what I'm excited about either.I was just letting you know where everything was set and excepting your info!the boats loaded probably weigh about 1600 to 1700lbs.

thanks again!!

 

[pootnic]

Re: war eagle predator + ETEC 115 PROP question?

I'm no guru but seeing as he is a friend...
Why not see if you can try his prop?
Is his motor an etec or another brand 115 maybe I should of asked this first?

 

[zwalls]

Re: war eagle predator + ETEC 115 PROP question?

I'm no guru but seeing as he is a friend...
Why not see if you can try his prop?
Is his motor an etec or another brand 115 maybe I should of asked this first?

I have a hub kit coming in today.he's going to let me try his out!!he's got a yamaha F115!!

 

[Silvertip]

Re: war eagle predator + ETEC 115 PROP question?

If your hole shot is the same or about the same as the four stroke Yammy and he leaves you on top end, then there is something wrong with your setup or the engine is simply not making full power. Have you checked to ensure the throttle is opening fully -- and I don't mean is the lever going full forward. I mean look at the engine end to ensure full travel is reached. Is his boat is loaded the same as yours. Weight costs performance. Props with identical specs from different manufacturers can perform very differently. It is called design! Are you trimming properly at both hole shot and top end. Have you experimented at all with engine height.

 

[zwalls]

Re: war eagle predator + ETEC 115 PROP question?

If your hole shot is the same or about the same as the four stroke Yammy and he leaves you on top end, then there is something wrong with your setup or the engine is simply not making full power. Have you checked to ensure the throttle is opening fully -- and I don't mean is the lever going full forward. I mean look at the engine end to ensure full travel is reached. Is his boat is loaded the same as yours. Weight costs performance. Props with identical specs from different manufacturers can perform very differently. It is called design! Are you trimming properly at both hole shot and top end. Have you experimented at all with engine height.

thanks silvertip,
no I haven't checked the throtle.I'm not the best outbaord mechanic even though I used to build engines in cars to drag race...lol
weight wise our boats are identical in setup other than engines.we actually both weigh the same even though he'll tell you he's lighter!
I leave the engine down until I've gotten on plane and then begin to trim.I did raise my engine once I got the boat from the dealer.the AV plate was beneath the surface of the water.raised it a couple holes and now the AV plate is just above the surface.maybe I can take a picture this weekend and post it!
I appreciate all the input.it just seems to me I should be getting a little more out of this motor even with the existing prop!!

Z

 

[craze1cars]

Re: war eagle predator + ETEC 115 PROP question?

Keep in mind that not all 115's are created equal....

Heck, even within the Evinrude ETEC line they offer a base 115 ETEC, and a HO 115 ETEC that adds variable exhaust valve and a different/better intake system...they brag the HO version is simply faster. One would think 115 is 115...but clearly it's not...even within the same brand and model year.

And you're comparing 2 different brands, and 2 stroke vs 4 stroke...very different.

I'm not sure if Yamaha 115's are stronger than Evinrude 115's...but that alone could make all the difference in the world...he may simply have more power than you do. The prop exchange will be interesting...and fun! Report your results!

As for throttle position, I urge extreme caution messing with an ETEC on your own. As an owner of a late-model fuel injected Ski-doo snowmobile (same company and technology) that I actively performance-modify, I can attest that sometimes throttle plates in the TB do NOT necessarily open all the way at WOT throttle setting...believe it or not...and overriding it manually to open the plates flat with a linkage adjustment will throw TPS and other sensors off, and will thereby confuse the computer's fuel delivery...it might not even run when you're done. So even if you find your throttle is not fully opening, DON'T TOUCH! Ask a dealer....or proceed with adjustment at your own VERY HIGH risk....

Your dealer will need to use his Evinrude Diagnostic system on a laptop to verify TPS settings, etc...and there is no way for you to do this by yourself at home...and attempting could cause damage. Unless you buy the diagnostic programs. A few aftermarket companies are starting to come out with this stuff for the home user and independent mechanic: http://www.brpdiagnostics.com/evinrudediagnostics/ But for the most part, you will be a slave to the Evinrude dealer to diagnose most anything on those machines....

 

[zwalls]

Re: war eagle predator + ETEC 115 PROP question?

Keep in mind that not all 115's are created equal....

Heck, even within the Evinrude ETEC line they offer a base 115 ETEC, and a HO 115 ETEC that adds variable exhaust valve and a different/better intake system...they brag the HO version is simply faster. One would think 115 is 115...but clearly it's not...even within the same brand and model year.

And you're comparing 2 different brands, and 2 stroke vs 4 stroke...very different.

I'm not sure if Yamaha 115's are stronger than Evinrude 115's...but that alone could make all the difference in the world...he may simply have more power than you do. The prop exchange will be interesting...and fun! Report your results!

As for throttle position, I urge extreme caution messing with an ETEC on your own. As an owner of a late-model fuel injected Ski-doo snowmobile (same company and technology) that I actively performance-modify, I can attest that sometimes throttle plates in the TB do NOT necessarily open all the way at WOT throttle setting...believe it or not...and overriding it manually to open the plates flat with a linkage adjustment will throw TPS and other sensors off, and will thereby confuse the computer's fuel delivery...it might not even run when you're done. So even if you find your throttle is not fully opening, DON'T TOUCH! Ask a dealer....or proceed with adjustment at your own VERY HIGH risk....

Your dealer will need to use his Evinrude Diagnostic system on a laptop to verify TPS settings, etc...and there is no way for you to do this by yourself at home...and attempting could cause damage. Unless you buy the diagnostic programs. A few aftermarket companies are starting to come out with this stuff for the home user and independent mechanic: http://www.brpdiagnostics.com/evinrudediagnostics/ But for the most part, you will be a slave to the Evinrude dealer to diagnose most anything on those machines....

I hear ya!maybe I should've went with the HO.I wanted the yamaha and the dealer and Evinrudes website convinced me other wise.but as of now I not feeling as good about my choice.I've had plenty of Evinrudes over the yrs and never had any problems with em.but I do believe the Yamaha has a little HP and a better gear ratio that gives it and edge.I had a yamaha f90 on a previous boat that I enjoyed!! I don't know!

I'll definitly post my results ASAP!!

thanks for the advice on the throttle positioning.after running my test this weekend depending on results and may just bring it to the dealer anyway.he's also waiting to hear about the results beings he's the one that convinced me that the E-TEC would out perform the Yamaha!!

good talkin with ya!!

 

[zwalls]

Re: war eagle predator + ETEC 115 PROP question?

well the test results are in!! whoo hoo the prop won't fit!! hub is definitly too long. I wish the Mercury rep would've told me this when I told him that I was going to try the Laser II on and etec.instead he gave me a part # for a hub kit.

oh well back to the drawing board!! any prop manufacture recomendations?stiletto,solas,ballistics,apollo?



edit:found out the quicksilver light speed is suppose to be the same prop as the Laser II but with no name on it and it will fit an E-Tec.hopefully I can get my hands on one and give it a try!!

 

[zwalls]

Re: war eagle predator + ETEC 115 PROP question?

for you guys who've been helping me,the dealer had me drop the boat off with him.I was going to take a day off from work and meet with him to help him do the testing.I was really interested in the results first hand.he would'nt do any testing we me present.maybe I'm wrong but would've like to had run the test with me in the boat!!

anyway he's contacting evinrude for advice and diagnosing the motor.when he finishes I can go pick up the boat for testing myself!!
will post results ASAP!!

 

[zwalls]

Re: war eagle predator + ETEC 115 PROP question?

the dealer called me today and said he was finished with testing.I think he only tried one prop but he ended up with a rogue 13x19 ss.his results were 5700rpm's at 48.2mph.at 19"pitch,2.0:1 gear ratio at 5700rpm's at 48.2mph that's 6% slip.has anyone ever heard of that low of slip percentage?something just doesn't seem right.even if that's correct it's still not the results I was hoping for.I still can't imagine over coming the 50% difference in fuel economy no matter what prop I end up with on it.anyway picking it up in the morn and taking it for a test run before I leave the dealers town.will post results tomorrow!!