More on twins for 23'ers...

[sandman]

I looked into this pretty closely, for the 150 the wot range is 4750-5250 according the the service manual, the HP rating is at 5000. The 175 (same block) is in the 5250-5750 range with the HP rating at 5500. Everthing is the same but they must tweek it somehow to get the extra rpm, Probably with the computer somehow. I wonder if I can hack it?

Given the condtion of the bottom and the junk I have on board, I think the top end is in line with where it is suppose to be.

My disappointment with 140's vs the 150's stems from a test on the same boat.

While not anything like a seacraft there is some meaningful info in thise comparison...

http://twinveeboats.com/engine_results.htm

http://twinveeboats.com/DockSide_26CC.html

WOT difference is 52.5 vs 45.1 [img]images/icons/frown.gif[/img]

At 30 mph, 2.3mpg for the evinrude 150s and about 3mpg for the 140's. [img]images/icons/smile.gif[/img] Some quick calc's based on 200 hours of use each season would save me about 1300 bucks per year in fuel (@2.25/gal) give or take. Not bad, over 5 years the savings is about 6500. (by then the life of the engine is questionable IMO)

some other #'s :
http://twinveeboats.com/engine_results.htm

[Briguy]

Sandman,

I am reluctant to recommend the Suzuki 140's for your situation. I have 115's on my 78 master cc and they work fine for me. 4k rpm's=25.5 kts or 29.3mph and wot at 5950 at 37.5kts or 43mph. I feel very comfortable running these motors all day at 4600 rpm's and I still get close to 3mpg and a speed of about 32kts or 36 1/2 mph. Bumping up to 140's offers little displacement gain so your hole shot would be the same as mind and surely a disappointment from v6's but nonetheless faster than a single 225 or 250. As far as speed, the Suzuki 140's, would probably cruise at 27kts at 4k and top at 39-40kts. This is merely a guess as I have not seen reports. There are numbers floating around on a 25 ft Dusky with twins 140's and it topped at 45mph if I remember quick but that hull probably weighs 3800. The new yellowfin 23 made here in sarasota is one bad bitch rated up to twin 200's. Strangely enough guys are passing up the traditional twin v6's and hanging the 140 suzuki's for about 49-50mph. If you wait for twin etec's it will be a year+ and mucho dinero. Twin HPDI or Ficht 150-175's are probably the way to go in your case. Good luck.

[AlexT]

I'm surprised that the HPDIs are not on your list. Hanging pair on the back is roughly equiv. in weight to four strokes but you'll get more power, fuel economy that is within the range, and relatively proven technology. Doesn't sound like you troll a lot so the quietness of the 4 strokes in that mode is probably not a huge benefit for you.

If weight is an issue I would go with Evinrude's current crop of bigger engines.

With either brand you can go 150 or 175 on the same block so that is no weight penalty for your extra 50 horses. Heck with the HPDIs you could go with twin 200s for the same weight as twin 150s.

[Vicfish]

I've been running twin 150hp 2 strokes on my 23CC for 4 1/2 years and they are really worth the money. Before the Yamahas I had 135 Rudes for 24.5 years and had lots of troubles like blown engines and the damn things were impossible to start on a cold morning. They did run for a long time but I spent a lot of time on maintainance. They powered my Fishing from NC to Florida to Texas to California. If they still built them that tough I say get them but I think OMC financial problems aren't over. Ask any old evinrude dealer that got left out in the cold when OMC went under.

If you can afford 4 strokes do it.

I've owned Mercurys, Suzukis, Evinrudes and Hondas, nothing has compared to the Yamahas