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Author Topic:   horsepower vs engine displacement
mustang7nh posted 04-05-2003 11:31 AM ET (US)   Profile for mustang7nh   Send Email to mustang7nh  
I'm investigating the costs of repowering with a 200hp. Of the big three mfg: FICHT is the heaviest, Yam has DPHI and OX66, and Merc has Opti, EFI, and carb (and 3.0L block) in that order of dry weight. The bore on the different technologies is different suggesting that these are different engines, etc even though hp rating is the same.

Any general rules as to the pros and cons between these choices? I would think that the larger blocks give you more torque which in turn might turn larger props for heavier boats like Conquests. However, for lighter classic Outrages, what are the advantages of the heavier engines to 100lb lighter carb Merc (vs FICHT) for a 20 Outrage? If weight is held constant I can get a 250 MercXR for the same weight as the FICHT. Thanks

lhg posted 04-07-2003 03:52 PM ET (US)     Profile for lhg    
Generally, DFI engines on a given block do not put out quite as much HP as an EFI or carbureted engine.

With Mercury, for instance, the 60 degree 2.5 liter V-6 EFI/carb easily puts out 200+ on that block, but in Optimax version, the highest HP is 175. So Mercury's 200 Hp Opti is built on the much more powerful 3.0 liter block, and because of this, is probably the fastest 200 currently on the market, basically the same as their 225 Optimax. We're hearing that the 200HP Ficht is also fast, for same reason. But they are big and heavy. The conventional Mercury EFI 200 is a great engine, and it's heavier than the carbureted version only because it carries the larger 60 amp belt driven alternator. For price/HP output, nothing beats the carburetored Mecury 200, as long as don't mind the start-up smoke.

Yamaha uses the same displacement for conventional and HPDI technology, but the HPDI's have a new, narrower block design, probably better. It seems the 90 degree blocks of their conventional technology engines, originally copied from OMC, are becoming obsolete, and not being used in new outboards designs for many years now. So I would bet the HPDI's are better engines, although expensive to buy.

I would think the recent news on E/J being up for sale, again, would make one of those Ficht purchases questionable at this time. Who knows, but why take a chance on an uncertain future?

mustang7nh posted 04-07-2003 06:48 PM ET (US)     Profile for mustang7nh  Send Email to mustang7nh     
Thanks lhg for the information. What would the best weight/hp output be? I have a 1988 Johnson 200 and I think it weighs 465lbs so anything over that probably is just too much rear weight to keep it balanced well.

What are the fuel adv of EFI over carb in the new models?

Thanks again for your help.

lhg posted 04-07-2003 08:21 PM ET (US)     Profile for lhg    
You can find all the specs on the Mercury Saltwater 200's on mercurymarine.com, but at 415lbs I think the carbureted models are now the lightest 200's around, and the least money. The EFI is about $1500 more.

For that you get about a 1/4 gallon per mile better fuel economy, instant throttle response, extremely quiet operation (quieter than a 4-stroke or Optimax at planing speeds), and no choke or throttle advance starting. You also get about 2mph higher top speed, due to a 5800 redline vs 5500. With all the sensors on the system, you always get optimal fuel burning and no oil slick on the water. Finally, my experience after 6 years of ownership and 1400 hours, is totally trouble free operation, both engines.

I would think a Mercury 200 on a 20 Outrage would give you 50 mph. A 19" pitch prop would be correct, preferably a Laser II model, since you have high HP on a light weight hull. Mount the engine in the middle (3rd) holes.

captbone posted 04-08-2003 12:16 AM ET (US)     Profile for captbone  Send Email to captbone     
I have always wondered about weight and how it might effect the boat. On one of my old work boats, we actually wanted more weight in the transom to get it too sit more in the stern. Most people do not have that problem. But the true of the matter is that you are talking about 50 pounds in either direction that you go, (4 strokes not included). I would thin about it as a extra battery aft or maybe a leprachuan sitting on your motor now. 50 lbs really is not alot IMO on a boat that size. If your go with the fichts then go with the 250 because it is just a different computer program. If you go with optimax then go with the 225 because it is the same as the 200. The other choices are the 200 hpdi which is only slightly heavier 10-15lbs, the 200 EFI the lightest. 200 carb in my eyes would be a bad choice just because of the great advancments in Tech. The 225 suzuki is also a great EFI in the weight range. Then there the 175 FICHT by Evinrude which are great and you will lose only about 1 mph if that and it is pretty light weight and a great engine also. Personally, I would get the 200 hpdi, then 175 Evinrude, 200 EFI merc, then the 250 ficht followed by the 225 suzuki then by the optimax 225. If you are happy with performance then go with the 200 0r 175, but if you are a man wit the need for speed, then go straight to the 250 fitch. Just my 2 cents
mustang7nh posted 04-08-2003 09:36 AM ET (US)     Profile for mustang7nh  Send Email to mustang7nh     
I like the way you think Bone. I'm not a Baja or Fountain speed maven, but hauling the mail down wind post 50 in a Whaler is my definition of ecstasy.

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