PDA

View Full Version : OMC prop recommendations



cutwater
02-20-2008, 04:38 PM
I've got an aluminum 21" prop that came with my boat when I bought it last year (1988 Minx) and I'm looking to upgrade. Any recommendations for a good stainless prop that fits OMC? Do they make adapter hubs? Do any particular props give good all-around performance for the Minx?

I have the King Cobra 5.7L rated at 270hp, and the Cobra drive which I have read has a 1.31:1 gear ratio, however I found another website that said the drive it came with was 1.41:1. How do I find out for sure?

Manufacturer: OMC
Model: "5.7L King Cobra; 5.7 L King Cobra"
Year: 1988
Horsepower: 270.0
Cylinders: 8
Type: 4 stroke
Gear Ratio: 1.41:1
Min WOT (http://www.piranha.com/glossary.php?term=WOT) RPM: 4400
Max WOT (http://www.piranha.com/glossary.php?term=WOT) RPM: 4800
Spline Count (http://www.piranha.com/glossary.php?term=splines): 15

Thanks,
John

Dr. Dan
02-20-2008, 06:28 PM
:wavey:Mine is a King and its a 1:43 Ratio, make sure its a King Drive with the Hump on the Top.

I run Turbo TXP props... for normal ops. try a 21 to 23 pitch, they do have a hub kit... I order mine from Poodle, but there are alot of sources...

Doc of Slow Boats :drive:

cutwater
02-20-2008, 06:42 PM
Thanks Doc. Mine must be the 1.31:1, because it is NOT a King Cobra drive, just a Cobra. I do have the King Cobra 5.7L, however.

Poodle, do you know of anyone who got good performance out of a bone-stock Minx with the Turbo TXP? What pitch would you recommend?

BUIZILLA
02-20-2008, 06:55 PM
my Cobra drive was either 1.75 or 1.81, can't remember..

BlownCrewCab
02-20-2008, 06:59 PM
What kind of speeds are you getting now? are you only spinning 4800 rpm? I think you can spin it 5400-5500 easily. Just switching to a stainless prop of the same style will be a good pick up. I think you may be able to use a flo torq hub and run merc props, that makes your prop choices endless.

cutwater
02-20-2008, 08:04 PM
I'm almost certain the drive ratio is 1.31:1, mated to a 270 HP 5.7L. I do not trust my tach, so I will not even bother to comment on RPMs/speed. That's on the to-do list for the winter :wink:.

So, if I have a Flo Torq II hub for OMC like this one

http://www.go2marine.com/product.do?no=100422F

then I can use any prop which is set up for the Flo Torq II hub? Is this correct?