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Prop for 175 hp E-tec on 1984 Outrage 20
jlh49	#21  Posted on 09/18/07 - 6:09 AM
Member Personal Page Posts: 92 Comments: 1 Joined: 02/25/07	From the Evinrude website: Q - What grade of fuel should I use in my motor? A - Current recommendations are to use a minimum of 87 octane, 89 octane is preferred. There is no additional benefit from using higher-octane fuels, in fact they may cause hard starting conditions in hot weather. If you have an older motor and the owner's manual requires premium fuel, here's why: When these were built, the best oil available was TCW-2 rated, and did not contain the additive package (detergents, carbon preservatives, etc.) which our current oils (XD-30, XD-50 and XD-100) contain today. In that era, premium fuel contained the additive package that helped prevent the formation of internal engine deposits. That's why premium fuels were preferred at the time. Ultimately, in the late 90's the federal government mandated fuel refiners to use the same additive package in all grades of fuel and the premium fuel requirement was dropped. Jack Harley 1989 Outrage 22' 2005 Yamaha F150
Jeff	#22  Posted on 09/18/07 - 6:20 AM
Member Posts: 1987 Comments: 34 Joined: 04/02/05	Roger, The E-Tecs run on 87 just fine. My dealer tells everyone he sells one to that 87 is all they need. However, the old non EFI 2 Stroke outboards need to run a minimum of 89 Octane. 1993 23' Walkaround Whaler Drive
arthureld	#23  Posted on 09/18/07 - 10:38 AM
Member Personal Page Posts: 735 Comments: 7 Joined: 02/15/07	I just realized that the 14 3/4 x 17 SST that I am using is not the one Tom Clark recommended. Now I'm totally confused. Here's what Tom recommended - "14-1/2" x 19" OMC/BRP SST/Viper, 14-1/4" x 17" Stiletto Advantage II, 14" x 19" Mercury Offshore/VenSura or 14" x 19" Mercury Laser II" I am so busy right now but I need to do some more testing.
Tom W Clark	#24  Posted on 09/19/07 - 6:03 AM
Member Personal Page Posts: 4280 Comments: 7 Joined: 09/30/05	There have been several versions of the SSTs over the years but I think the prop you have now is a good one. The 14-3/4" x 19" is the only 19" SST/Viper they offer now. I am not thrilled by the RPMs at WOT though. You do not report what the top speed was during that test. Did your dealer tell you? I still think the 17" Stiletto Advantage II would be a better performer. Edited by Tom W Clark on 09/19/07 - 6:05 AM
arthureld	#25  Posted on 09/19/07 - 6:54 AM
Member Personal Page Posts: 735 Comments: 7 Joined: 02/15/07	Thanks for your input Tom. The dealer didn't tell me the rpm from their prop test. I have the 14-3/4 x 17 prop on now that has SST between the blades. That is the only one I tried so far. It went up to about 5700 RPM and 44.4 mph. My motor is new (less than 10 hrs), and I my have hit the rev limit, but if I did, it wasn't a noticable rev limiter like I have felt on motorcycles and cars. I also have a 14-1/2 x 19 stainless steel prop that I took off my old motor. But I haven't had a chance to try that one yet. I'm working so much, it's hard for me to find time to play. I hope to do a few more test runs this weekend.
kamie	#26  Posted on 09/19/07 - 4:11 PM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	arthureld wrote: My motor is new (less than 10 hrs), and I my have hit the rev limit, but if I did, it wasn't a noticable rev limiter like I have felt on motorcycles and cars. Nope, you were far from it. Rev limiter on the 175HP kicks in at 6100 RPMs. You will gain some RPMs as the motor finishes with the breakin.
arthureld	#27  Posted on 09/19/07 - 4:18 PM
Member Personal Page Posts: 735 Comments: 7 Joined: 02/15/07	Well, I made it out again. I put my old stainless prop 14 1/2 X 19 on and it felt better to me and I got up to 46.4 mph this time and about the same rpm 5700 or 5800. I was by myself this time though.
arthureld	#28  Posted on 09/20/07 - 4:38 AM
Member Personal Page Posts: 735 Comments: 7 Joined: 02/15/07	kamie wrote: You will gain some RPMs as the motor finishes with the breakin. Kamie, what limits the RPM until after the 10 hr breakin? It seems strage that I got up to the same 5800 RPM with the 14 1/2 X 19 prop but 2 mph faster compaired to the 14 3/4 X 17.
kamie	#29  Posted on 09/20/07 - 6:38 AM
Member Personal Page Project Albums Posts: 2975 Comments: 3 Joined: 11/04/05	As far as I know it's just the motor getting broken in and loosening up. I can't say for sure but on all the Evinrude forums the experts say, expect to gain some RPMS after breakin finishes. Without knowing what is different between the two props, I can't say. If Tom knows both props maybe he can tell you.
arthureld	#30  Posted on 09/20/07 - 7:19 AM
Member Personal Page Posts: 735 Comments: 7 Joined: 02/15/07	The one that seems to work best is a stainless prop off of my 1984 185hp Johnson. It is a 14.5 X 19 with no markings on it. I think it is an old OMC SST prop. The other one is a 14.25 X 17 SST prop. Both props went up to about 5800 RPM but the 14.5 X 19 went 46.4 mph. The 14.25 X 17 went 44.4 mph. The boat jumps up on plane smoothly with either prop.