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  84 evinrude 70hp vs 89 johnson spl 70

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Author Topic:   84 evinrude 70hp vs 89 johnson spl 70
chrisb posted 09-29-2002 06:02 PM ET (US)   Profile for chrisb   Send Email to chrisb  
I'm looking at 2 used motors to repower my 78 15 sport. One is an 89 Johnson spl without power tilt and trim that was used as a rental on lake george on a starcraft 15. The other is an 84 evinrude taken off a 15 sport private boat repowering to a fifty four stroke with power tilt and trim. Does the powerhead vs prop rating differ given the years, or are they identical with different stickers? Are the hole patterns the same? I plan to use it to ski.
I hope to get a few years out of it untill the 70 hp fours weigh less than 300 lbs. Thanks.
newportguy posted 09-29-2002 07:08 PM ET (US)     Profile for newportguy  Send Email to newportguy     
Hi Chrisb,

The 89 70 hp is rated at the prop for horsepower and the 84 is rated at the crank.... so the 89 would have more get up and go.... But the older one has the power trim and tilt....Not usre what I would do... But before I had the 17 Newport I did have a 15 sport with a 79 - 70 with out PTT and while it was nice the PTT would be a must now in my book.

jimh posted 09-29-2002 07:21 PM ET (US)     Profile for jimh  Send Email to jimh     
The motor with history in a rental fleet would probably not be the best choice.
JBCornwell posted 09-29-2002 08:41 PM ET (US)     Profile for JBCornwell  Send Email to JBCornwell     
Hi, Chris.

I would get the '84. Any additional "paper" hp the '89 might have will not be measurable in boat performance, and the T&T is really nice to have.

Red sky at night. . .
JB :)

chrisb posted 09-29-2002 09:03 PM ET (US)     Profile for chrisb  Send Email to chrisb     
Thanks, I am nervous about the rental too. Would you recommend asking the marina to try to find and mount a tack (where?) or just seeing if it ran well set up the way it is since it was on an identicle boat? If the hole pattern is the same in the transom is there any need to do a set back plate?
Hank posted 09-29-2002 10:31 PM ET (US)     Profile for Hank  Send Email to Hank     
With respect to power '84 90HP Evinrude, according to my engine manual, is rated at the prop ! (More accurately at the prop shaft)
Outboard motor manufacturers of that date were already using specs based on shaft ratings. I doubt if there is a "paper advantage" due to the rating method.


Bigshot posted 09-30-2002 09:47 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
They never made a 70 spl. 1984 may have been first year of prop ratings on some engines. That is when the detuned the 200 to a 185, etc. I know they did not do all engines and I think the 70 was not prop rated until they redesigned it slightly for 1986. I would go with tilt and the nicer and cleaner engine. Years don't mean doo-doo.
thebone12 posted 10-01-2002 09:51 PM ET (US)     Profile for thebone12  Send Email to thebone12     
any one who has rented a boat know that they BEAT those things into the ground, even smaller horsepower ebgine are given poor oil and fuel and are just BEAT. Stay away!

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