fuel burn 23dv

[rpeconic]

New to the site, first post, here it goes. I purchased a 95 23' dv pilothouse with a 2001 yamaha 225 ox66. Love the boat but the fuel consumption is bad. The boat will do 25mph but burns over 22gph trimmed out at 4500rpm. Should I try changing the props, or look at repowering in the fall. Love the site, any help appreciated.

 

[POGE]

I was suprised by the fuel burn you had so he are some numbers although not a direct match up. You have some more weight than me but same hull,these numbers are with the basic factory set up on F250 Yamaha: 4100 rpm, 26 mph, 9.2 gph. I can get up to around 4300 rpm, 28 mph, and still be under 10 gph at 9.8 gph. With 4 medium sized folks on board, fishing gear for four, other gear and 80 gals of fuel: 45oo rpms at 27 mph, 9.8 to 10 gph.

 

[miky2884]

I have a 2320 DV also with a 225 ox66. I haven't found the fuel consumption to be terrible, by no means is it great, but you really have to pay attention to how you are running the boat. 4500 seems a little high to me, i run about 39-4100 and im getting 26-28 mph thats with half barrel of fuel and 3-4 guys on the boat.

 

[Parker23]

Those numbers are horrible! I have a 2002 DVSC with a 2002 200hp OX66, at 4200rpms I'm doing about 25mph burning 14gph.

 

[SBH2OMan]

Welcome to CP!

With our pig-heavy 2320 Extended Cabin and Ox66 250 (when it is running) the fuel burn rate is right around 12gph to 16 gph depending on speed and RPM. Running at about 5000 rpms, she'll cruise at about 28 or 29 mph (statute) and get about 1.9 mpg to 2.2 mpg. We are under-propped with a 15p 3-blade. I can wind it up to 5700 rpm and the rev limiter kicks in (according to the winky blinky) and doing about 34 to 36 mph (statute). My gut tells me a 17p would be a better match and would probably yield better fuel economy.

The only time I see the GPH meter peg like that is when there is a problem. Are you able to get up to WOT?

Engine trim and trim tabs can also affect this, but not like you are seeing (if I have it trimmed REALLY badly, the GPH might go up to maybe 18 while cruising).

The biggest problem with the OX66 is getting the damned things to run properly. I have spent so many hours and dollars screwing with it, and it will suddenly just stop working, then lead me down a meandering path of seemingly unrelated problems that cascade on top of one another. Sorry for the rant, but I'm getting sick of going to the marina, seeing my "dead" boat sitting there while the weather is wonderful, and pulling my kayak off the dock and paddling 5 miles so I can go fishing instead of wrenching on the boat. No mechanics seem to know how these things work - they are like some exotic Ferrari that has to be dealt with in a very specific way by someone that really knows the motor, otherwise you have problems galore (like a Ferrari!).

 

[SBH2OMan]

I have a 2320 DV also with a 225 ox66. I haven't found the fuel consumption to be terrible, by no means is it great, but you really have to pay attention to how you are running the boat. 4500 seems a little high to me, i run about 39-4100 and im getting 26-28 mph thats with half barrel of fuel and 3-4 guys on the boat.

Man, you guys run your motors at low RPMs - you must have big props! The WOT spec on this motor is 5700, and for me to get my boat up to cruising speed (around 21 to 24 mph statute) I have to turn 4600 to 4800. She seems to run happiest at around 5000 (and gets the best mpg). I know I'm under-propped, btw. But running a motor at 4000 rpms that is designed for nearly 6000 seems like too low to me. The only "Performance Bulletin" I can find from Yamaha is from a Stamas 29 and a 19" prop. From that bulletin it looks like the "sweet spot" was around 4000 rpm for fuel consumption, but that was a florida go-fast boat, not a Parker.