hatteras 37' 1977 cruise speed

[bmf8550]

I have a 1977 37' hatteras. my hatteras is powered by 671 detroit 285 hp engines. i am trying to get some information on cruise speed and top end speed. Also looking to see what props are recommended for this boat and what pitch. I am having speed issues.

[Tim Powell]

i have a 1977 37' hatteras. My hatteras is powered by 671 detroit 285 hp engines. I am trying to get some information on cruise speed and top end speed. Also looking to see what props are recommended for this boat and what pitch. I am having speed issues.

i am not positive but you can contact hatteras and they have the specks on the boat when it left the factory.. There is a possibility that the crowd at sams can help with the same information good luck tim

[bmf8550]

Does it make a difference in speed if you run 30 micron filters rather than running 10 micron filters?

[Kim Beatley]

I have a 1972 36 C Hatteras. I can easly cruise at 15 knots and not cringe when I fill up. 20 knots is easy as well, but you will start to see a significant increase in fuel consumption. Tabs down help as well.

My WOT is 26 knots.

The hull has to be clean. I clean it every month. You can loose 2 to 3 knots easly with a dirty haul.

[hcalmar]

1979 37C with 671TIs, 310hp and a tower 17-19 knts cruise full and clean at 1900-2000rpm. 25gal/hr wot 22knts.

[newinlet]

1978 37c. 310 hp j&t. 16-17 knt cruise. 2300.rpm19-20 maybe 21 2500.rpm Clean bottom. My boat has a hardtop
Hatters says. 18 knt. Cruise. 21 wot. No hardtop. With 671n engines

[bmf8550]

What size and pitch props are you running? I am running 24 x 27 4 blades. My paper work on boat calls for 24 x 26 props.

[newinlet]

I will get back to you

[newinlet]

Right at the moment I cannot seem to put my hand on my survey If you contact Steve @ sams. He should be able to get you the prop size. Fwiw. I think you should have the 310 hp j&t.
Any growth on the bottom or running gear effects my speed & max rpm.

[bmf8550]

I will deffinantly look in to it. So you are saying if i change my injectors i can get more power out of them? I am also having rmp issues. Just finished remoldling the whole exterior of boat. On my old gauges i was reading 2500 to 2800 rpms. Now with all new gauges my engines are only turning up 1550 rpms. Im going to shot engine with a manual gauge to get a true reading. I did take the throttle housing apart, and it did look like they have some shims to goven them down for some reason. What is really weird is that the first time we took it out after remoldling we were doing 18.5 knotts at 1550 rpms. I really think i have a blade are something on the props bent. Has anyone ever seen shims in the throttle housing? And why would someone want to put them?

[jim rosenthal]

Are your tachs set correctly for these engines? Most modern tachs have to be programmed for the tach generator that they "see".

[bmf8550]

I was not aware of that. They are electric gauges.

[dougl33]

Does it make a difference in speed if you run 30 micron filters rather than running 10 micron filters?

No it does not.