PDA

View Full Version : Best prop for mastercraft prostar 190 lt1 with 1.5-1


Matt555
02-05-2013, 05:30 PM
Hi- I recently bought a mastercraft prostar 190 1997 with lt1. It had a 13x13 prop with a top speed of 32mph at 5500rpm.

I believe the transmission is 1.5-1.

I want an all round prop for slalom, barefoot and wake boarding.

Any help appreciated?

Matt

j.mccreight@hotmail.com
02-05-2013, 07:04 PM
Hi- I recently bought a mastercraft prostar 190 1997 with lt1. It had a 13x13 prop with a top speed of 32mph at 5500rpm.

I believe the transmission is 1.5-1.

I want an all round prop for slalom, barefoot and wake boarding.

Any help appreciated?

Matt

Hmmm, something is definatly amiss, first you will need to verify exactly which transmission you have, a 13x13 is oem for a 1:1 and a 14x18 is for 1.5:1, your best bet is to contact Acme propellers (888-661-ACME) or OJ propellers (800-359-9730) and ask the experts.

strad
02-05-2013, 08:16 PM
Also mike your shaft before you call. I know the earlier powerslots like mine have a bigger shaft (1 1/8th instead of 1 inch). It'd be nice to know that everything forward of the prop is powerslot spec on your boat before you try to order a correct prop for it.

petermegan
02-05-2013, 09:13 PM
Definitely need to confirm transmission ratio and also a gps confirmed speed first. Have fun.

CC2MC
02-05-2013, 11:59 PM
That is a good point about GPS confirmation. Are you going off of the boat speedo? I wouldn't think that the speedo would be off by 12-13mph, but anything is possible and a less expensive fix if that is the case.

j.mccreight@hotmail.com
02-06-2013, 12:06 AM
That is a good point about GPS confirmation. Are you going off of the boat speedo? I wouldn't think that the speedo would be off by 12-13mph, but anything is possible and a less expensive fix if that is the case.

Not to mention the 5500 rpm's, seems a bit much its over spinning the prop by a huge amount.

Matt555
02-06-2013, 06:27 AM
Thanks to all for replies. Shaft is 1"1"8 and have verified with my gps that speed is correct.

5500rpm is 32mph top speed. Gearbox is 1.5-1.

What sort of top speed will I expect out of 14x18 prop James? Will it still give me plenty of power take off?

Cheers matt

petermegan
02-06-2013, 06:56 AM
I am running a 14*17.5 ACME but don't ask the number. same ratio trans as yours. Standard 14*18 was similar although didn't perform quite so well in all areas. Better speak to a prop expert, someone has wrongly propped that boat by a mile! I have been tempted to talk to ACME about gearing. Mine is doing pretty close to 3900revs at 36mph which is a tad underpropped for my liking and use. I would personally prefer 3600revs at 36mph. Top speed is a measley 43/44mph with the LTR330 indmar. Have fun.

willyt
02-06-2013, 07:09 AM
Something still isn't right about those specs...

But if they are... Can you imagine the take-off being that badly under propped? Would literally rip your arms out of their sockets

EJ OJPROP
02-06-2013, 07:41 AM
The numbers sound right with a 13 X 13 on a PowerSlot trans. I would suggest trying our 13.7 X 17.5 LC 1 1/8" XMP 4-blade.

Matt555
02-06-2013, 04:44 PM
The numbers sound right with a 13 X 13 on a PowerSlot trans. I would suggest trying our 13.7 X 17.5 LC 1 1/8" XMP 4-blade.

What speed would I expect at say 3500 rpm and 5500rpm with this prop?

j.mccreight@hotmail.com
02-06-2013, 04:54 PM
What speed would I expect at say 3500 rpm and 5500rpm with this prop?

Well your not going to get to 5500 rpm anymore, when properly propped (oem 14x18) or what OJ recommended, wot rpm should be 4200-5000 rpm and 47mph as per the owners manual at sea level, a more realistic mph will be 44-46 mph imo.

Ski-me
02-06-2013, 05:25 PM
Per the manual, WOT is at 5,000 RPM's so you are definitely over-reving.

I think I hit around 43-44 MPH on my LT1, 1:1, 205, elevation 6,000 ft.

When I switched from the 13 x 13 factory prop to an OJ prop, I gained a bit more hole shot and also better top end. The CNC, next generation is worth upgrading.

Manual:
http://www.mastercraft.com/knowledge/owners_manuals/

DooSPX
02-07-2013, 08:26 PM
The numbers sound right with a 13 X 13 on a PowerSlot trans. I would suggest trying our 13.7 X 17.5 LC 1 1/8" XMP 4-blade.

I agree with Eric! He knows his stuff and awesome service and products. I have that same prop on my powerslot trans boat and its a monster.

Your boat never left the factory with 13x13 on a powerslot trans. it had a 14x18 stock. someone changed the prop to the incorrect one.