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Author Topic:   1979 Merc 70hp
DaveNJ posted 01-28-2004 02:59 PM ET (US)   Profile for DaveNJ   Send Email to DaveNJ  
What do you folks think of a 1979 Merc 70 hp with no trim n tilt ? Was this a good motor year or should it be avoided.

I know it is tough to judge or offer an opinion sight unseen, but just need a general opinion on this vintage motor.

Assumptions: Low hours < 250 hours, pretty well maintained over 3 owners, little or no corrosion, no accidents or lower unit damage, excellent cold starting.

Ran across a good deal for another boat project. For a 15' Whaler.


gfrutig1 posted 01-28-2004 04:16 PM ET (US)     Profile for gfrutig1  Send Email to gfrutig1     
I had one on my 15 sport for 11 years. Replaced the stator ring 2x. My father now has it on anothe 15 ft run about. I moved up to an 89 70 hp Merc with T&T.
Bigshot posted 01-30-2004 01:27 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
Had pone on my 15" 1983. Adding PTnT is easy being a seperate pump like an I/O and different shocks to replace the ones on it. Should be able to do it used for about $2-300.

As far as the engine goes, more like a 50hp of todays engines. Was not the most powerful and had the small gearcase which limited you to a 11x17" prop or so. Mine would hit about 5500+(redline 5700) and do about 36+mph, not exactly stellar being my 70 Johnson brought the boat up 10+ mph.

lhg posted 01-30-2004 01:37 PM ET (US)     Profile for lhg    
A friend had one on a 1973 Katama, bought new. The 16'
Whaler would run about 38 MPH with this engine. The block is 1/2 of the Merc in-line 6, which means the 70HP rating was at the powerhead. I would expect it to run more like a 60 HP of today. I was never particularly fond of the engine. Not many left around these days.

Interestingly enough, BW used a pair of these engines on some of the first photos of the 18 Outrage hull, back in 1983. Dougherty wanted to emphasize that this boat could be set up nicely with small twins for offshore use.

DaveNJ posted 01-31-2004 06:42 AM ET (US)     Profile for DaveNJ  Send Email to DaveNJ     
Thanks everyone for the replies.


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