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Author Topic:   New vs. Old Motors
dhormann posted 07-06-2000 06:08 PM ET (US)   Profile for dhormann   Send Email to dhormann  
I just acquired a 70(?) 13' sport and am looking for a motor. A local dealer has a 1991 40hp Merc short shaft. I've been told by another dealer that horsepower was measured differently after the mid 80's and that the newer 40 would be too much for the 13'. Does anyone know anything about this? I don't want to spend a bunch on a motor that will be too big or heavy for my boat.
jimh posted 07-06-2000 11:22 PM ET (US)     Profile for jimh  Send Email to jimh     
The "difference in horsepower rating" refers to the earlier practice of rating the horsepower at the output of the powerhead, versus the current practice (by law in US) of rating the horsepower at the output of the propshaft.

So a current "40 HP" engine probably does have more power than an older "40 HP" engine.

Is that enough to overwhelm the 13-foot Whaler? Probably not. We've seen people with 48-50 HP on 13-footers.

The weight factor might be more important. I don't like to see the static trim on the Whaler do be so much down by the stern when you hang an overweight engine on it.


reeltime2 posted 07-07-2000 09:14 AM ET (US)     Profile for reeltime2  Send Email to reeltime2     
Its defanetly not going to be a problem. There are several 13 footers here in south florida that run 48 and 50 horse outboards. When I was in high school I had a friend who had a 70 on a 13 now thats way too much engine for a 13. I think a new 40 would be just right.
lhg posted 07-07-2000 12:54 PM ET (US)     Profile for lhg    
If the Merc 40 is in good shape, I'd buy it.
I had a 13' with a 1970 in-line four Merc 50(powerhead rated) which is basically the same engine you are considering. Boat handled it easily. There's a picture in Jim's Reference/Testimonial section. Mine would do about 43mph with the Merc shown. I think getting less than 40hp on a 13 is a mistake, as 40 seems to be about the best all around power for the hull.

There seems to be SO MUCH mis-information from so-called dealers these days. Was the Dealer, who told you 40hp was too much for a 13, a Whaler Dealer? It seems many people in the boating business these days are either incredibly ignorant and mis-informed, or will do anything to make their sale & kill somebody elses sale.

dhormann posted 07-08-2000 12:44 AM ET (US)     Profile for dhormann  Send Email to dhormann     
No, he wasn't a Whaler dealer, so his experience with the boats is probably a bit sketchy. I'm going to go back and take a look at it tomorrow. It's configured with a tiller at the moment and would need to be changed to remote.
Pat Smith posted 07-16-2000 10:22 AM ET (US)     Profile for Pat Smith  Send Email to Pat Smith     
Hope somebody could help me,I have a 85 outrage 18'with an 85 johnson 150 hp.I'm looking for a newer engine(better on gas),A friend told me I should put a 115 Yamaha 2000.Will that work?Or is there something else.Thanks
bigz posted 07-16-2000 12:11 PM ET (US)     Profile for bigz    

If money is no object I suggest the Yamaha Z150TXRY which is their new High Pressure Fuel Injection 150hp 25" shape model -- awesome, she'd really get up and boogie --- if bucks need to be trimmed an Optimax 135 would do the trick.
Either one would give you better fuel economy than the standard EFI models (gas prices aren't going south anytime soon) and both are compliant to the new EPA requirements for outboards --- Just my thoughts for what there worth, others are always welcome at my camp fire with theirs.


bigz posted 07-16-2000 12:12 PM ET (US)     Profile for bigz    
oops meant shaft and shape --
Pat Smith posted 07-16-2000 09:40 PM ET (US)     Profile for Pat Smith  Send Email to Pat Smith     
Tom, The reason I asked about the Yamaha is that I may be Able to get it at a good price(money is a problem)Thanks
lhg posted 07-16-2000 11:50 PM ET (US)     Profile for lhg    
Pat: A friend had a Yamaha V-4 130hp on an 18 Outrage, and it would run around 42mph. Very nice setup. Since the 115 is on the same block, it should do fine, probably only a couple of MPH slower. A long time Whaler rep has told me many times that he thought a 115 was perfect, highly effecient power for an 18. The 130 was a nice engine, very smooth and quiet.
alan posted 07-18-2000 11:44 AM ET (US)     Profile for alan  Send Email to alan     
just repowered my '82 18'6 Outrage with a 150 Optimax(from a 150 Johnson). My first choice was Yamaha but could not get one, high demand/low production from what I understand. Also, the new engines are going to the boat manufaturers first to meet their packaged agreements. 135 vs.150HP - same block and weight, higher resale w/150 and it's nice to have the power in the ocean when neeeded. If you decide on repowering with any weighty engine on that Outrage be sure that they install any oil tank and battery in your console or your stern will sink a couple of inches. alan

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