Aluminum vs Stainless on 2000 Johnson 50 2 stroke

[wildbill3740]

Read many posts concerning this matter. Aluminum is more forgiving on gears...lighter in weight...takes the beating on oysterbeds,etc.(ultimately ruining prop) and cheaper. Stainless is stronger,more durable, heavier in weight, and harder on gears especially if idle speed is higher. This is what i have gathered from many posts and from talking from several people inthe prop world. Others say that ss props arent hard in the gears... i don't personally know. But do think that a bang or "bump " that a ss prop takes in the water...something has to absorb the energy since the prop is harder. Also heard that 1998-2001 Johnson 50 2stroke lower units were "weak" ones. When bought out the changes??? My question is that SS or aluminum on feeble lower unit??? Is it true that these units really had issues?

 

[wildbill3740]

Re: Aluminum vs Stainless on 2000 Johnson 50 2 stroke

no comments. I know you know someone with a 50 hp johnson. what are your ideas on stainless?aluminum?

 

[steelespike]

Re: Aluminum vs Stainless on 2000 Johnson 50 2 stroke

Evindude/Johnson are the same motors with different cosmetics.
Can't help on the gear case. Stainless props hold up better in sand or mud.Boating where hard contact is likely they cost more to repair
and you need to hope the safety hub works.Entry level ss props are likely only slightly better in performance than a good Modern al prop.You can get a very good Solas al prop for about 1/2 the ss price. Turning Point al props can also give good performancve.

 

[nowgrn4]

Re: Aluminum vs Stainless on 2000 Johnson 50 2 stroke

What RPM are you running now trimmed out at WOT? I have found the same diameter and pitch with a stainless as opposed to aluminum prop will give 300-600 more RPM at WOT on the same hull. Stainless props are cupped. This cupping helps lift the hull out of the water for less wetted drag surface and hence less resistance. If you need the additional RPM to get the engine up to it's rated Max revs Then get a stainless. As far as wear is concerned always shift decisively into gear. Never ease into gear, this is when you hear the grinding of the dogs trying to interlock. Always pause in neutral for a second or two to let the prop stop turning before you change from forward to reverse or the opposite. The only drawback besides the cost of stainless is that if you hit something hard enough you can bend the propshaft. With a aluminum prop you just destroy the prop. Like anything there are pros and cons.

 

[wildbill3740]

Re: Aluminum vs Stainless on 2000 Johnson 50 2 stroke

i have the details in the other post 2000 Johnson 50 reprop in this forum. Thanks

 

[WIMUSKY]

Re: Aluminum vs Stainless on 2000 Johnson 50 2 stroke

Here's his link to the other thread to help you guys out....

http://forums.iboats.com/prop-questions-topics/2000-johnson-50-reprop-601301.html#post4187693