18hp too big?

craveman85 · Jun 17, 2013

I've got a1968 Grumman 13'1" flat bottom tinny. The capacity/ model/ serial tag was missing when I bought it. Would a 18hp 68 evinrude be too big for it?

stevesecotec02 · Jun 17, 2013

Only one way to find out lol. Looks like a pretty light boat so it would certainly fly. If I had to guess I would say it was probably origonally rated for 10hp.

Whoopbass · Jun 18, 2013

A guy I know has an 18 on a smaller boat then that and he wants to get a 25hp motor.

craveman85 · Jun 18, 2013

This 18hp used to push my16' semi v 22mph. I done really care how fast its going to go. I just done want to damage it.

MDCrappie · Jun 18, 2013

Here's a post with the formula to determine Max HP based on size of boat....if plate is missing

https://www.tinboats.net/forum/viewtopic.php?f=4&t=12144

lckstckn2smknbrls · Jun 18, 2013

I'd do it.

craveman85 · Jun 18, 2013

I honestly think that formula is not accurate at all. My 16' tinny was rated for 45 on the tag and that said I shouldn't go above a 25. My 12' tinny i used to have was only rated for3 on this system but said 15 on the transom. You'd think the manufacturer would underestimate for insurance purposes anyways.

BDS05 · Jul 1, 2013

I think you'd be fine running an 18.

lovedr79 · Jul 3, 2013

youll be fine. we ran an old seahorse 18 on a 14' flat bottom.

craveman85 · Jul 3, 2013

Ended up losing the 18hp in our recent flood so it looks like I'll be searching for a new one.

18hp too big?

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