which way does the diffuser ring go?

[whywhyzed]

OMC factory alum 15 spine prop 14x21 .<br />flared out or coning in?<br />I was so proud of myself getting the ring off an old damaged prop in 1 piece and then popped it onto the good prop with a big BANG!!!<br />Then I thought..OMG..it's backwards.<br />But I have another dead prop sitting here and it looks backwards too...cruised ebay and I see both ways...

 

[DJ]

Re: which way does the diffuser ring go?

Coning in. Flare toward the front of the boat.<br /><br />It doesn't matter a whole lot at speeds anything over idle.

 

[Dhadley]

Re: which way does the diffuser ring go?

It's been done both ways. Thats how you can tell the difference between an SST I and an SST II OMC prop (although that's not the only difference).<br /><br />With most performance props these days the wider part is towards the aft of the prop. Although some performance props have no flare, just a straight barrel. Look at Turbo props and the difference between a Lightning and a TXP.

 

[Texasmark]

Re: which way does the diffuser ring go?

Hey D, I remember my first OMC SS prop back in '72 on a 125. It was teflon coated with a brass diffuser ring going in. All the props I had seen prior to that were Quicksilver and they were one piece flared out.<br /><br />Took me awhile to get used to it. Prop seemed to run out ok. Just different.<br /><br />Mark