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Author Topic:   16-footer, E-TEC 90 Propeller Selection

beantown posted 05-03-2008 12:13 PM ET (US)
Well I finally got the new E-TEC [90-HP]. It only took a month. Do I have the right prop? I don't have a lot of information about performance but here goes:
3,000 RPM = 21 nautical miles per hour
4,300 RPM = 32 nautical miles per hour at maximum throttle [i.e. about 36-MPH]
I will get better information I have just only had it out twice. To me [the maximum engine speed] just sounds low for the max throttle. I thought that these [Evinrude E-TEC motors] topped out at 5,500-RPM. The propeller that came on it [marked] 13.2 x 19, but has no name or anything else. The boat is a Nautauk [perhaps back formation from NAUset + monTAUK], old hull with all newer fixings. Any help on the right prop would be great. The engine runs fantastic.
At what speed should I cruise? It feels comfortable at 3,200-RPM, but is that too [fast] if the maximum is 4,300-RPM?
Thanks for the help, here are a couple of bad pictures
Tom W Clark posted 05-03-2008 12:36 PM ET (US)
No, that is not the right pro, not even close. Go back to your Evinrude dealer and tell him to exchange that prop for something a little closer, like the BRP 13-1/4" x 17" part # 763463.
You want the WOT RPM to be much closer to 5,500 than 4,300. Your boat speed should be in the low 40-MPH.
If you want a prop that is much better than an OEM aluminum then try their 13-1/4" x 15" Stiletto Advantage I. That is the prop many E-TEC 90 owners are using on their 16/17 foot Whalers.
seasaw posted 05-03-2008 09:26 PM ET (US)
Tom is correct on prop selection. I have the same set-up as you and love the stiletto but I max out at 5,000, plenty of pull and speed for me. I think those with a setback bracket are able to get to 5,400-RPM
Jeff
LIQUID NIRVANA posted 05-11-2008 12:11 AM ET (US)
The perfect wide open throttle for your 90hp E-Tec is 5200rpm. Anything else is lugging the motor & adding to your fuel consumption. In addition it is reducing the life of your motor.
[URL=http://rides.webshots.com/photo/2469116900091848696sPtiGj][IMG]http://inlinethumb32.webshots.com/13343/2469116900091848696S600x600Q85.jpg[/IMG][/URL]
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Author	Topic: 16-footer, E-TEC 90 Propeller Selection
beantown	posted 05-03-2008 12:13 PM ET (US) Well I finally got the new E-TEC [90-HP]. It only took a month. Do I have the right prop? I don't have a lot of information about performance but here goes: 3,000 RPM = 21 nautical miles per hour 4,300 RPM = 32 nautical miles per hour at maximum throttle [i.e. about 36-MPH] I will get better information I have just only had it out twice. To me [the maximum engine speed] just sounds low for the max throttle. I thought that these [Evinrude E-TEC motors] topped out at 5,500-RPM. The propeller that came on it [marked] 13.2 x 19, but has no name or anything else. The boat is a Nautauk [perhaps back formation from NAUset + monTAUK], old hull with all newer fixings. Any help on the right prop would be great. The engine runs fantastic. At what speed should I cruise? It feels comfortable at 3,200-RPM, but is that too [fast] if the maximum is 4,300-RPM? Thanks for the help, here are a couple of bad pictures
Tom W Clark	posted 05-03-2008 12:36 PM ET (US) No, that is not the right pro, not even close. Go back to your Evinrude dealer and tell him to exchange that prop for something a little closer, like the BRP 13-1/4" x 17" part # 763463. You want the WOT RPM to be much closer to 5,500 than 4,300. Your boat speed should be in the low 40-MPH. If you want a prop that is much better than an OEM aluminum then try their 13-1/4" x 15" Stiletto Advantage I. That is the prop many E-TEC 90 owners are using on their 16/17 foot Whalers.
seasaw	posted 05-03-2008 09:26 PM ET (US) Tom is correct on prop selection. I have the same set-up as you and love the stiletto but I max out at 5,000, plenty of pull and speed for me. I think those with a setback bracket are able to get to 5,400-RPM Jeff
LIQUID NIRVANA	posted 05-11-2008 12:11 AM ET (US) The perfect wide open throttle for your 90hp E-Tec is 5200rpm. Anything else is lugging the motor & adding to your fuel consumption. In addition it is reducing the life of your motor. [URL=http://rides.webshots.com/photo/2469116900091848696sPtiGj][IMG]http://inlinethumb32.webshots.com/13343/2469116900091848696S600x600Q85.jpg[/IMG][/URL] ===========================================================