GW 330 Express Repower

[JoleGW33]

If you have a 330 Express with twin F300, what propellers do you run? brand, diameter and pitch if possible.

Repowering from F225, not sure on what propellers to run on the new setup.


thanks in advance!

 

[ocdansar]

I am interested also as I will soon be repowering with F-300’s. I thought about calling the Prop God guy from THT and get his opinion.

 

[brdawg2001]

Depends on make...Zukes are geared way differently than Yammies...I went from 19 to 23 pich!!

 

[everwhom]

I have the 4.2L F250's (same engine, but different / detuned ECM) and I run the 15" pitch Mercury Thunderbolt (aka Mirage Plus). I would consider the 4 blade Powertech OFS4 in 14" or 15" pitch. I'm thinking about trying those out to see if I can hold plane at lower speeds and possibly increase cruise efficiency.

 

[Flot]

I bought a 2002 GW 330 which was repowered with 2013 F300s - it came to me with Thunderbolt 15.5 x 17 .

Props seem to perform well - acceleration, bite, etc, is excellent. MPG is not stellar (1 mpg is about normal) and top speed is 41-42 on a good day. Holds plane best in 27-30 mph range.

Curious to hear what others are using, I know from past boat testing that while it's a pain, prop choice makes a tremendous difference all around.

 

[everwhom]

My 2002 GW came with Thunderbolt 15.5 x 17 on my F300s.

Props seem to perform well - acceleration, bite, etc, is excellent. MPG is not stellar (1 mpg is about normal) and top speed is 41-42 on a good day. Curious to hear what others are using, I know from past boat testing that while it's a pain, prop choice makes a tremendous difference all around.

Are those the 4.2L F300's or the HPDI 300's? What's your WOT RPM?

 

[Flot]

Are those the 4.2L F300's or the HPDI 300's? What's your WOT RPM?

Sorry, I was unclear - my 2002 was repowered in 2013 with four stroke 4.2 F300s, I meant to indicate that *I* haven't done any prop testing on it vs what I bought the boat earlier this year with.

My WOT RPM is a little on the low side but doesn't come up much even trimming the motors way up - off the top of my head 5400 rpm or so. Boat is bottom painted and I'm generally running it medium load, bottom paint is in moderate condition.

I do occasionally see 1.2 mpg at cruise in perfect conditions, but ~1 mpg feels like an honest assesment.

 

[JoleGW33]

Thanks to all for the replies.

 

[fsc60]

I just bought Power tech OFS4 15.25x15 pitch 4 blade props in June
They are on new Yamaha 300s which are on my 2001 3300 Express boat is bottom painted
I am still breaking in the motors, but by the weekend i should be able to open them up, boat is full of fuel and water.
I can tell you this, we went out for a ride, 11 people, 4200rpms and we were at 32 mph
It felt like it had so much more
After Break in 5500 RPMs at 40 mph, my Yamaha Dealer thinks that if I try to get more RPMs with a different prop I will probably over Rev.
This combination works great, i can stay on plane as low as 3200 RPMs
They bite great, She pops right out of the water, reverse is no problem,
I typically Cruise at 4000rpms at 30 mph with a 1.1 mile per gal thru anything,