Prop Specs ONLY

[rdvanput]

Hi all, recently purchased a 1990 20' Supra Sunsport with PCM Ford 351 factory 230 HP. 475 hrs on engine. I have the 1:1 tranny. This is the first boat I've owned, although been around boats most of my life. Still, learning a ton of new info. This is exactly the post I was looking for so thanks to SquamInboards for initiating it. I will be using the boat mostly for skiing and wake boarding and just all around cruising. I know I have a three blade prop and I believe it's OEM, but sorry I don't have other details. I'd really like to know what others would recommend for my boat and usage. Thanks!

[SquamInboards]

Hi all, recently purchased a 1990 20' Supra Sunsport with PCM Ford 351 factory 230 HP. 475 hrs on engine. I have the 1:1 tranny. This is the first boat I've owned, although been around boats most of my life. Still, learning a ton of new info. This is exactly the post I was looking for so thanks to SquamInboards for initiating it. I will be using the boat mostly for skiing and wake boarding and just all around cruising. I know I have a three blade prop and I believe it's OEM, but sorry I don't have other details. I'd really like to know what others would recommend for my boat and usage. Thanks!

How's this for a delayed response?

Looks like the user above, 'Kip' has a similar boat, and the same engine/transmission. I'd call Acme or Skidim with that info and see what they think, but I'd look at the one Kip used (above in this thread).

Then, let us know what you end up with!

[Foe]

1983 Supra Sport
PCM Engine 260hp
Velvet drive 1:1 gear ratio

Old prop:
Federal Supercup 13x13 nibral

with approx. 1500lbs ballast very bad performance, poor hole shot, massive vibrations, wake was washed out
WOT 3900 rpm @ 40mph

new prop ACME 541 13x12 3-blade
feels like a new boat, no vibrations at all, excellent hole shot, better/cleaner/longer surf wake
WOT 4200rpm @ 40mph

ordered prop at nettleprops, shipping time 10 days to Germany.

We are super happy with the purchase!

cheers Flo

[LCYrace]

1987 Supra TS6m
351w, GT40p heads, Performer RPM intake, Edlebrock 1410
Velvet Drive 1:1

Acme 541 13x12 3-blade
Great holeshot, great ski wake, great fuel economy
WOT 4500~4600rpm @ 44-45mph depending on conditions and passengers

$369 from Wake Makers!!!!

[mbraun55]

purchased in fall - only ran to test drive... picking up in a week - concerned!!!

1990 comp ts6m
351w
1:1 I think
prop unknown - has spare

problem I have is during the test drive - 3800 rpm WOT and 38 mph was the max!!! I need more... hole shot was strong so i'm hoping I can change prop and gain a little top end but my concern is the wot at 3800 rpm seems low for a 351w...

I understand there are A LOT of factors that could effect this including but not limited to - bad fuel, dirty carb, bent prop (was so excited I was buying I never even looked - my bad) low compression (ran smooth) - what else could it be??? wrong prop size? best stock prop suggestion (what should the prop be???)

[Jetlink]

Could be a calibration issue with both as well. Just throwing that out there.

[scbowles]

91 Pirata
new reman 454 gen V with Edelbrock Performer Intake Manifolds 2561. Tbi Marine conversion. Ports matched. fresh air exhaust.
72c velvet drive 1,1
Acme 4 blade 14 x 12 #3033 .60 cup.
2000 rpm 17 mph
2200 rpm 24 mph
2800 rpm 30 mph
3000 rpm 32 mph
3400 rpm 34 mph
3600 rpm 37 mph
4200 rpm 41 mph
Using dual GPS speedometers.

[nboardskier]

1986 Sunsport Skier - 19'

351W / 230hp?
1:1 Velvet Drive
Acme 543 - 13x11.5 - .080" cup

WOT 4200rpm - 42mph. 2 adults aboard.

Use = wakeboarding and slalom
No Ballast

[Mgruenenwald]

New to the forums here, I have a 1989 Pirata 351 that I’m hoping to turn into a respectable surf boat. Recently damaged the stock 3 blade prop and now it shudders when weighted down with 2500 pounds and a surf shaper. Any recommendations on what prop to go with as an upgrade? Not concerned about top speed. I believe I have a 1” shaft, but am not entirely sure. Any recommendations would be greatly appreciated.

[mikestanley464]

A propeller is a device with a rotating hub and radiating blades that are set at a pitch to form a helical spiral, that, when rotated, performs an action which is similar to Archimedes' screw. It transforms rotational power into linear thrust by acting upon a working fluid, such as water or air.[1] The rotational motion of the blades is converted into thrust by creating a pressure difference between the two surfaces. VidMate
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