whats your top speed 140hp omc 4cil

[192 reggata]

i got an 87 glasstream 19ft deep v boat what would my average speed be?? on normal conditions i know weight on the boat makes a difference

 

[Lyle29464]

Re: whats your top speed 140hp omc 4cil

high 30's

 

[atomb]

Re: whats your top speed 140hp omc 4cil

i ride at 22 mph ..i dont want to push her because i want her to last.

 

[floridacruisers]

Re: whats your top speed 140hp omc 4cil

I have an 17' '89 Glastron Sierra with a 3.0L and run it around 3200 rpm max ( unless I'm being chased by a thunderstorm). Speedo shows upper twenties but I prefer that to WOT. Fuel economy is better and it's easier on the engine and drivetrain and I can enjoy the world going by. It also gives me some safety margin for avoiding the crap you find in the water's today.

 

[192 reggata]

Re: whats your top speed 140hp omc 4cil

thanks guys im just trying to get an idea of what i should be running im 23 yrs old and this is my second boat i have the last one had a an inline 6 this one is a 4 cil so i wanst sure

 

[Boatist]

Re: whats your top speed 140hp omc 4cil

I have a 21 foot Aluminum Runabout that weighs 2800 pounds dry.
I have two props. 17 pitch stainless top speed is 35 miles per hour at 4600 rpms.
Second prop is a 19 pitch stainless and top speed is 38 Miles per hour at 4200 Rpms.

 

[Lyle29464]

Re: whats your top speed 140hp omc 4cil

thanks guys im just trying to get an idea of what i should be running im 23 yrs old and this is my second boat i have the last one had a an inline 6 this one is a 4 cil so i wanst sure

below 3500 it will last for years and save fuel.

 

[Chaparralboater]

Re: whats your top speed 140hp omc 4cil

merc, here, no OMC but 3.0 and im hitting 38mph

 

[superbenk]

Re: whats your top speed 140hp omc 4cil

1980 OMC 140 w/ a Stringer 400 in a 18' Century closed bow (~2800 lbs, guessing). I hit somewhere between 33 & 35 MPH on the GPS depending on load, etc. I'm running a 13.5"x17p prop.

 

[Robbabob]

Re: whats your top speed 140hp omc 4cil

i got an 87 glasstream 19ft deep v boat what would my average speed be?? on normal conditions i know weight on the boat makes a difference

Most of the time, we look at sizing the prop to the engine's WOT (wide open throttle) max rpm on your boat. With details, we can give very close information to suit your needs/desires. That is why you see so many giving maximum speeds they can attain; while others give their average desired speeds as answers.

Being smart, nobody runs 100% open throttle all the time... something about running out of fuel within an hour or two. It's just a measurement to know your prop/engine/hull are working together, with the most effeciency possible.

I'd guess your boat would be comfortable between 15-25 mph, given good conditions; top speed of mid 30's or so.

 

[192 reggata]

Re: whats your top speed 140hp omc 4cil

thanks guys im going to start looking at different props i took the boat to my guy hes gonna fix a couple of things on there