Twin 140 4Stroke Suzuki's

23yellow · #1 08-21-2003, 05:26 PM

Thinking of putting twin 140 4Stroke Suzuki's on the back of my 23 Seacraft. Just wondering what kind of cruising speed I should expect and at what RPM's, fuel consumption, and WOT. Oh yeah, how much money would two engines cost me. Thanks for any input.

PipeDreamsMarine · #2 08-22-2003, 08:16 AM

FINSTER!!!!!.. sounds like a question for Finster...

Daniel · #3 08-22-2003, 10:03 AM

I think the Suzukis go for like $8000 a piece. While we are on this subject, I heard that the Suzukis and the Yamaha don't stand up to the saltwater all that good. Any comments on this from anyone?

JohnB · #4 08-22-2003, 02:40 PM

I don't think I would hang twin 4 strokes on the back of any 23' boat unless it had a large floatation bracket along the lines of a hermco or something of that nature. Your sculpers will probably be permanently underwater, and the boat at rest is going to sit real low in the back.
One Suzi 140 is 410 pounds. My 250 Merc is 472 pounds. 820 pounds is alot of weight to hang off from the back of a 23' boat. I would want at least 400 pounds of positive bouency underneath them. A buddy of mine has them on a 23' boat and gets around 3 mpg cruising at about 27 mph. As far as reliability, the suzi's and yami's that I know about seem to hold up pretty well. All manufactures make a bad motor or a whole bad lineup/year from time to time (Merc, 'Rude, and yes even Yammis). Unforutnately, if you buy a new one, you won't know until it is too late (lol).

[ August 22, 2003, 01:42 PM: Message edited by: JohnB ]

Finster · #5 08-22-2003, 03:47 PM

Well, as far as economy my DF 115 runs on air. I don't know how many GPH or MPG's it gets but it's alot.

As far as curosion goes I don't think it's worse that anything else. This is my third season and it seems to be holding up pretty well.

Jon G · #6 08-22-2003, 08:50 PM

The corrosion thing is on older Suzuki engines, the older four strokes I looked at were no worse off than anything else in saltwater. My new 140 (85 hrs. since July 3rd.) has the luxury of living on a trailer and gets soap and water after every use no wories here [img]images/icons/grin.gif[/img] . Like Finster said they use no gas I put 12-15 gallons in my 20' every ten engine hours I'll post the exact fuel numbers in the near future. I just gassed up tonight and gas went up ten cents a gallon this week super was $2.03 [img]images/icons/shocked.gif[/img] at the Mobil. I was really loving this engine when I saw the gas prices this week, they love to nail you for Labor day week end. Great engines [img]images/icons/grin.gif[/img]

Briguy · #7 08-26-2003, 01:37 AM

Trevor, Let me fully answer your question as I am the only one with a 23 with twin Suzuki 115 4 strokes on the site. Getting out of the hole with the 115's is no problem. I had 8 people on my boat 4th of july and she just came up beautifully. With 3 people on board she cruises at 4000 rpm's at 25.5 knots. At that speed she burns 10.5 gph for a net of 2.9 mpg. Efficiency is maintained from 3500 to 4500 rpm's at the same mpg so I don't suffer if I want to kick it up to 29 kts or so. At WOT I am running 5950 rpm's trimmed high and my speed is 37 kts, maybe 38 1/2 with the wind. I run 23 inch Suzuki aluminum props.

As you all know I put a bracket on this year and went with a Mattson & Co flotation bracket with a swim platform. The chamber is 42 inches wide. The boat sits well in the water but she's no self bailer. In the "If I had to do it again" department I'd have them fabricate the chamber so it was 10 inches wider to offer about 20% better flotation. I also carry 150 gallons of fuel so if I replace it with a 100 gallon tank I may gain an inch or 2 at the waterline. I would not recommend going with twin 4 strokes on the transom. In any kind of following sea, you will get water coming over the back.

The bracket makes the boat really ride so much better. It feels bigger, more solid and the ass end stays put in the water where without a bracket in 4 ft seas's I was coming completely out of the water. The full transom also offers your passengers extra stern room for a smooth ride sitting in a deck chair.

Finally I have a 1999 Suzuki 4 stroke on my flats boat. There is absolutely no corrosion. Those 140's should add 3-4 kts at top end and maybe 1-2 kts at cruise so don't plan on there being much if any extra fuel burn.

rtspindrift · #8 09-08-2003, 05:06 PM

Have you thought about the new Suziki V6 line that will be arriving soon. They will feature a true 250hp V6 with variable timing. At only 580lbs it is lighter than the yahama 225. According to the press and what I have seen at a recent boat show it will be the most advanced outboard arround. Check out the web page. http://www.suzukimarine.com/sr04/df250/

gss036 · #9 09-10-2003, 01:06 AM

Here is a link to the Suzuki test page w/twin 140's.
I was looking at the 250 for my 23WA, but I am not that impressed with the fuel consumption. I was hoping for better results. I know I will have to repower one of these days as I am running a 1989 Merc 200hp now.

http://www.suzukimarine.com/boatbuil...eWeekender.php

Briguy · #10 09-10-2003, 12:18 PM

Gary, Not that impressed with the fuel consumption???????????????? What are you accustomed to, putting a sail up every time you want to move? All kidding aside, I get over 3mpg with my 2 115 suzuki's. Trolling probably over 5-6mpg. Look on the suzuki website, the 31 Yellowfin(made in Sarasota) achieved 2.05mpg burning 15.6 gph at 32mpg at 3500 rpm's. A recent powerboats report listed an intrepid with twin ficht 250's and the best it could do was 1.6 mpg.
P.S. The only boat I would ever trade my 23 SC for is a 36 Yellowfin with 3 250 suzuki's.