Re: TOP Speed Mariah SC25 with 5.0L
 

TomasSE

Engine is a 5.0l MPI 260 Horse. Since I got it properly serviced (unlike the previous owner!) it is going really smoothly.

Only bought the boat last summer and had it in the marina for 12 weeks only it really slowed down as the season wore on and used a lot of fuel as I didnt have the hull antifouled. Did get it lifted and powerhosed during that period which improved things a bit.

Spent the winter anti fouling the boat which has helped a lot this year with speed and economy.

Re: TOP Speed Mariah SC25 with 5.0L
 

Today I really tuned (trim) Z-wheel drive and my Mariah went 50 mph and the sun roof. Good boat.

Re: TOP Speed Mariah SC25 with 5.0L
 

takes a bit of practice to get the trim just right think I have got there now boat running very well.

About to get a lift and powerwash later this week, will improve speed onto the plane.

Have you pulled water skiers with your boat? My son will be home next week so intend to try the water skis.

Re: TOP Speed Mariah SC25 with 5.0L
 

Yes I was pulling water skiers, wakeboard (two wakeboard), rings, banana. So far no problem.

Re: TOP Speed Mariah SC25 with 5.0L
 

Sounds great, ya, I would say mid 40's...congrates!!

Re: TOP Speed Mariah SC25 with 5.0L
 

I have an '03 Mariah SX21 with the same motor you have, I have been playing with different props.

The stock prop is an aluminum 23p top speed is 49mph, RPM 4900

5 blade stainless 19p top seed was 51mph, but I was over revving a bit due to the lower pitch.

3 blade stainless chopper prop 21p (sharp racing type prop) 57mph at 5100 rpm



5 blade put the boat on plane without any hesitation almost instant plane.

3 blade chopper was almost identical hole shot as stock prop, little sluggish out of the whole.

Sorry if this was too much of an tangent.

Thanks,
John

Re: TOP Speed Mariah SC25 with 5.0L
 

My Mariah 25 SC 2008-mod with the MerCruiser 350 mag is doing 48 mph with a steel prop, rpm at 5100.

Cruising at 30-34 mph.

Re: TOP Speed Mariah SC25 with 5.0L
 

Clear calm river my 5.0 sx19 will do 50