Another " how fast " discussion

[tartuffe]

Originally Posted by THEFERMANATOR

Either your prop is toast, or your tach is way off. A 17 pitch should have you running in the 50's at 6300RPM's. I spun a 15.5" X 17 on my old HYDRA-SPORTS at 5600 which took me up to 53MPH.

I really wish I knew, I bought the engine last year, just rebuilt after my 225 rude shredded the splines in the crankshaft. That setup also only ran around 38 with just myself on a glassy day. I agree I should at least be in the mid 40's. Two GPS's told the same story, pig.

Its gotta be the prop and the prop is in good shape stainless, no dings or chips. Maybe not the pitch but the diameter. I wish I could rent a prop to get the right combination of diameter and pitch.

I gotta say it is nice being able to stand her up in 3-5's in the inlet with a low wave period.

[tartuffe]

What prop do you have draglink?

[draglink]

Originally Posted by tartuffe

What prop do you have draglink?

14 1/4 x 19 SS, ive tried a few different props but always come back to this one

[bgreene]

Originally Posted by tartuffe

I really wish I knew, I bought the engine last year, just rebuilt after my 225 rude shredded the splines in the crankshaft. That setup also only ran around 38 with just myself on a glassy day. I agree I should at least be in the mid 40's. Two GPS's told the same story, pig.

Its gotta be the prop and the prop is in good shape stainless, no dings or chips. Maybe not the pitch but the diameter. I wish I could rent a prop to get the right combination of diameter and pitch.

I gotta say it is nice being able to stand her up in 3-5's in the inlet with a low wave period.

Yup, with 225 hp in proper running order, and assuming your boat's same - not carrying an extra 1,000lbs water etc..............you should run over 50mph. The various 150hp's push the V21 to 39-42 mph. I get a little over 40 with mine.

[Shrek]

FWIW, my V-20cc with a 1999 Merc 225 Saltwater series (carbed motor) with jackplate did 53 mph wide open with 60 gallons of fuel and me. You should have seen the look on the doofus on the jet ski when I passed him ... priceless.

I was turning a 15 1/4 x 19p 3 blade stainless no name prop @ 5600 rpm. Had just a touch of trim tab, motor trimmed out and at max elevation on jackplate. Oh yeah, I also had the bimini up and there was a bit of a breeze and a very light chop. The prop was kind of blown out. My guess is that there was another 2-3 mph with a better prop.

My understanding is that the Opti is actually more stout than my carbed motor. I'm looking for a late model (07 or later) 250 opti for the back of the Short Bus. She should scream with that and I should see a doubling of my mileage. I hope so because 2mpg sucks (fuel).

[macojoe]

ts gotta be the prop and the prop is in good shape stainless, no dings or chips. Maybe not the pitch but the diameter. I wish I could rent a prop to get the right combination of diameter and pitch.

My local shop let me try one to make sure it was right, then as long as there was no damage to it he would exchange it till i got the right one. first i tried a 17 then i ended up with a 15. Use to be in the high 30,s full load with a 175.

Sea Ox does mid 30's now with a 200 HDPI its a heavy boat!

[tartuffe]

I think I'm going to try a 15 x 19 aluminum and if that fits the bill then buy the stainless. Hope to get in the mid 40's and more importantly get that RPM below 6100 while still maintaining some punchability.