New prop for 1989 Ski Nautique

I picked up my prop on Saturday.

I ran out of time over the weekend to carry out a water test, so hopefully I can get out one afternoon after work this week.

The repair shop measured the prop specs for me. It measures 14.4 pitch. 1.6 less than the 16 it was stamped as.

I understand that the manufactures may "round up" the specs, but I would expect to the next whole inch would be the most that they would round.

I'm not overly impressed that my prop is nothing like what is stamped.!

TRB,
Prop was brand new about 6 months ago, & until I dinged it, untouched as well.

Blade cup was approx 0.9 too.

I'd say the "error" is coming from my tach readings.

I'll be on the water this weekend so I can do some checking.

This is a down on your previous WOT of 5200rpm before repair. If they did not re-pitch the prop where did the 400rpm go?
Was your revs at boarding speed the same? If not maybe your tacho is on the blink.
I would re test with GPS and another tach if possible.
The WOT of 4800 sounds about right with that prop it is short on pitch. Is it possible your original WOT of 5200rpm was incorrect.

I have as very similar question as the original poster. I am trying to decide between the 470 and the 1442. The boat is a '89 Martinique with a 351W and 1.23 trans. Right now the boat has GT40P heads and I would like to eventually add some type of intake. Which do you guys think would be a better choice for this setup? Right now I'm leaning towards the 470 for a few reasons. I think the extra rpms will help with the additional weight of the Martinique, and the fact that the hull is pretty deep and moves a lot of water. Also I do mostly wakeboarding and feel this prop may help improve how well the boat holds speed, since it doesn't hold speed as well as other CC's due to the deep hull. Do you guys think this is a good choice? The prop needs to be able to cruise comfortably though as the water is often rough where I am and sometimes there is nothing else to do. Or do you think the 1442 is a better choice because of the heads and future intake? I really need to replace the current prop as it is one the previous owner added after the original got damaged. The current prop is a 1982 Chris Craft prop. Although I don't know much about this prop the receipt from when I got it balanced said that it was a 13x10. So as you can imagine with the 1.23 trans this boat is screaming at any kind of speed.
Thanks in advance.
-James

Thanks for the opinion. I don't plan on doing WOT runs all day but I would like to be able to do them from time to time. I would also like for the prop to be able to cruise for a while between 30-35 mph. Thanks for the heads up about the Delta discount that is actually what got ask this question, because I need to order the prop before March 31. I am already a member there but I don't post there very often.

Thanks for the input. Unfortunately the lack of performance numbers is what makes this prop selection tricky. I don't know much about the current prop as the previous owner put it on. But when I had it balanced the prop specialist seemed to know a bit about it. It's a 1982 Chris Craft prop with 13x10 specs. So obviously this is not a good prop for this boat. I'm not positive how accurate my gauges are as the tach bounces and I only have one speedo. But IIRC at WOT the boat was turning about 5500 rpm and the speedo read about 37 mph but me and my dad both agree that it felt more like 40-41 mph. Thanks again.

well I would see if you can borrow a prop for a day from some one that has something pitched a little closer to what you need and are looking at first, to get a new set of numbers on speed and rpm but the 470 doesn't sound like it's going to be that far off, but with the prop you have on it now it's so far off you really can't use the data for comparision sakes.

James, give Woody at SECC a call- he can tell you for sure which prop the 1.23 Martinique used. Report back and we'll make the best recommendation that we can with the info that you have.

James, they have changed names but Woody is still there and will help with CCs.

SECC 407-851-1965 - Woody

James, 470 and 1442 are the 2 props I would be considering as well if I were you. With the heads, Id give the nod to the 1442. Thats what I ran on my boat the latter half of last year.

This Delta deal is too good, I have a stock '89 SN that needs an upgraded prop. I ski much more than I wakeboard and all wakeboarding is done without weight. I am looking for a prop that will improve my hole shot, produce the best possible ski wake and hold speed at higher mph 32-36. I also plan to learn how to barefoot this summer and want a boat that is capable of barefoot speeds. Is the 470 the choice for me as well? Thanks!!

I am not sure of the performance but everything including prop is stock except for electronic ignition. My engine is strong, had a compression test last summer. I ski in Indiana, pretty flat. I have no plans to modify the engine. Does Delta take old props on trade? Thanks for you help, I appreciate all of the knowledge and wiliness to share and answer rookie questions on this site.