WOT Performance on a 1993 4.3 OMC

J

jdeitchler

Cadet
Joined
Jun 5, 2007
Messages
13
My performance from 18.5 ft boat with a 1993, 4.3 OMC is only 35 mph and 3800 rpm WOT. Is this all she has??? This is a 2bbl Holley carb with a standard (non-electronic) distributor. I have both a 14 1/2 x 19 3 blade and 4 blade props. It doesn't pull me out of the water skiing like I want. Shouldn't I get more like 4600/4800 rpm's with 45mph... And yank my butt out of the water with ease??? Any other observations, tips to increase performance would help...
 
Windykid

Windykid

Lieutenant Junior Grade
Joined
Apr 17, 2007
Messages
1,177
Re: WOT Performance on a 1993 4.3 OMC

You should do better than that.

Have you done a compression test?

How about a full tune up?:confused:
 
WAVENBYE2

WAVENBYE2

Lieutenant Commander
Joined
Apr 28, 2007
Messages
1,636
Re: WOT Performance on a 1993 4.3 OMC

I have a 91 Bayliner Capri 2050CX with a 4.3L mercruiser + Alpha drive. w/Mercarb 2bbl. And yes yours should be about the same performance, with the right trim + tilt setting I get about 48mph, she does 35mph at 3500rps.
 
88wellcraft

88wellcraft

Petty Officer 1st Class
Joined
May 9, 2007
Messages
208
Re: WOT Performance on a 1993 4.3 OMC

Have an 88 4.3 omc...cant remember what prop right at the moment. 4800 rpm trimmed and alone, I get about 55 mph. pulls me out of the water fine with 3 people aboard. (240lbs):rolleyes:
 
W

whywhyzed

Banned
Joined
Feb 1, 2005
Messages
1,871
Re: WOT Performance on a 1993 4.3 OMC

Check and make sure your throttle linkage is pulling the throttle all the way open in the carb. Simple things first. Visual Checks.... watch the choke at warm up - watch linkages move.
 
You must log in or register to reply here.
Top