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Author Topic:   4 cylinder & 3 cylinder
15ft Sport posted 03-04-2004 01:27 PM ET (US)   Profile for 15ft Sport   Send Email to 15ft Sport  
I am repowering my 15" sport & I have to go with a used 2 stroke. It is hard to find these size engines used, but I have found 2 models & I would like to know the advantages and/or disadvantages of both. The engines are a 70 hp 4 cyl Merc & a 60 hp 3 cyl Johnson. The Merc was O/H about a year ago & the Johnson is fresh out of O/H. They are about the samae price & about the same years.
Bigshot posted 03-04-2004 01:48 PM ET (US)     Profile for Bigshot  Send Email to Bigshot     
I am partial to the3cyl OMC's. If it was rebuilt, ask the builder if he upgraded the carbs to bulletin specs. If so it is a 70hp.
cape_rover posted 03-04-2004 03:31 PM ET (US)     Profile for cape_rover  Send Email to cape_rover     
I think you'll find the 4 cyl is heavy. I'd go with the Johnson also.
15ft Sport posted 03-04-2004 03:57 PM ET (US)     Profile for 15ft Sport  Send Email to 15ft Sport     
How do you mean "it is a 70 hp" Bigshot? The reason I ask is that I will be carrying alot of dive equip & will need the most horses I can get. Do you know where I can find out what that are required?
15ft Sport posted 03-04-2004 03:58 PM ET (US)     Profile for 15ft Sport  Send Email to 15ft Sport     
Sorry, should say what bulletins are required?
63WHALER posted 03-04-2004 06:45 PM ET (US)     Profile for 63WHALER    
I'll agree with Bigshot. I think it may just be a personal preference though. I currently have an 1989 Johnson 60 hp, 3cyl. on a 15' Striper model and love the performance along with the mileage. I believe it to be the perfect match H.P. & weight wise.
63WHALER posted 03-04-2004 06:45 PM ET (US)     Profile for 63WHALER    
I'll agree with Bigshot. I think it may just be a personal preference though. I currently have an 1989 Johnson 60 hp, 3cyl. on a 15' Striper model and love the performance along with the mileage. I believe it to be the perfect match H.P. & weight wise.
63WHALER posted 03-04-2004 06:50 PM ET (US)     Profile for 63WHALER    
Woops! sorry for the double post. Page expired and refreshed causing second post.
brisboats posted 03-04-2004 07:20 PM ET (US)     Profile for brisboats  Send Email to brisboats     
I agree with above, the 3 cylinder OMC looper is a seductive motor when the scavenging kicks in. I think you would like the lower profile cowl too when compared to the merc, especially on a 15'. Nothing against mercurys just in this instance the OMC gets my nod.

Brian

jimh posted 03-04-2004 09:02 PM ET (US)     Profile for jimh  Send Email to jimh     
What does "O/H" mean? Even www.acronymfinder.com can't make any sense out of this nonsense.
greyg8r posted 03-05-2004 05:55 AM ET (US)     Profile for greyg8r    
15,

FYI, jimh, the MOD, is a stickler (and BTW ICAM) to PAA, or, at the very least, DYA;-).

Richard

macfam posted 03-05-2004 09:20 AM ET (US)     Profile for macfam  Send Email to macfam     
jimh.
I'm guessing that O/H means "overhauled"
brisboats posted 03-05-2004 10:29 AM ET (US)     Profile for brisboats  Send Email to brisboats     
I too understood it as overhaul. Maybe try smoh, "smoh"= since major over haul, commonly used on diesel powered inboards. Hope it pops up in the finder.

Brian


Bigshot posted 03-05-2004 11:13 AM ET (US)     Profile for Bigshot  Send Email to Bigshot     
No idea of the bulletins per say but when I had mine rebuilt(1990 70) when I ordered the carb kits it said like "As per OMC's upgrades, use part #xyz which is a larger Jet and will make it 2000 spec 70hp" or some crap like that so that is what we did. I highly doubt there is much difference between the 60 & 70hp besides carb jetting.

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