Prop question/suggestion/problem

Just called delta and they do not have returns.

Ok thanks thats good life advise I would think it would work with more than just props. I will give them another call in a couple days.

On another note you really think the 913 is the one for me to start with? That would be going against acme recommendations. Idk how much actually boat time they put in. You may have more time spent finding a good BF prop then they do.

They said that they could take the 1229 which is 11" pitch with .120 cup and make it a .08 cup. Wonder if that would be better?

Sorry HW, you're crazy. If he's turning that 541 4200-4300, he's over propped. Drop pitch and you're gonna gain rpm. It's not gonna stop increasing unless the engine can't pull it. A 260hp 350 won't fall off its powerband until he approaches 5500. Move the wot rpm to where the engine makes peak power and you stand to optimize speed (all else equal). It's not a difficult equation and altitude just requires a little adjustment.

I think the suggestion of the 13x11 with .060-.080 will get you in the 4600-4800 range (though probably the low side of it). Be aware that acme only charges full retail to protect their dealers, so it won't be a bargain. It's also a custom prop at that point so that may hurt its value even more than the 10.5" pitch. I think either choice would get you close.

Oh and regarding prop recommendations, I am willing to bet that acme and delta are not trying very many props themselves. Acme understands reasonablg well how performance will change between their props once you have a baseline. Delta, a little less so. Still, they are largely regurgitating performance numbers supplied to them from their customers. Feel free to weigh opinions as you see fit but some of the customers providing performance feedback to acme and sharing it on this website have more hands on prop testing experience than some/most of the techs you'll get on the phone.

Thats what I thought. I kind of figured there advice is "perfect world" advice. In a perfect world you can just do the math and it will tell you exactly what will happen. The real world is not like that im guessing. Thats why I would listen to the people on here.

I got ya that makes sense.

63 Skier wrote: Looking at McMaster, 100 of the 1/8" x 1.5" in 18-8 are $12.55, and 25 of the 316 in same size are $8.31. Since 25 will last me a long time anyway, any reason to NOT go with the 316 stainless?

None at all. As Kevin mentioned, I would have suggested the 316 anyway!

Acme recommended me calling valley props in California. I did and they are running numbers and going to give me a call back. He is looking between the 1609, 1229 and the 913. He did mention that he saw why acme recommended the 1609 and not the 913 but did not state why. I think they have a decent return policy on non custom props.

+1 ^

Forced induction

phatsat67 wrote: Forced induction

It means adding a supercharger to add power by stuffing more air/fuel mixture into the cylinder.

Landis, is it worth saying the following to the guy - "I'm on board with running the 1609 that you are recommending, but a guy whose knowledge I respect feels the 913 may do the better job. Could I buy both, I'll run them carefully for a few passes to get the results, and will return one of them within a week of them arriving. Could you do that if I pay the return freight on the one I don't like? You'll have my money so if I damage the prop that will be on me, otherwise refund the price of the one prop."

I don't know what his answer will be, but they want to sell props and there's no risk for them.

Acme recommended calling Valley Props. Valley props said "let me get back to you". They both recommended the 1609. I'm not saying they are wrong, I don't have enough knowledge to know which prop is the right one, but think about it, Valley Props just called Acme, Acme said 1609 just like they told you, and so it appears they came up with it independently but I bet that's not the case, it's just Acme's finding.

Acme is a good outfit, I'm not for a minute saying you shouldn't be listening to them. Just have a feeling what I spelled out above is what happened.

99% of the time Greg at acme would make a recommendation to me he would say (but you know more about the boat/hull/engine combo than I do so use your decision not mine). Likely, the info here is the best since Tim and or anyone has quite the amount of inboard seat time in testing different props/hills/engines. Acme uses a mathamarical analysis that pulls engine speed/power/mph etc to make a recommendation.