200 YAMAHA on 23' SeaCraft

[martin]

Originally Posted by capttodd

Yes Martin, you have to run a 30" shaft on a twin Hermco bracket.

Thanks guys.. Planning on the future..

[Fr. Frank]

Originally Posted by SnafuFishTeam

1. Max HP on a 23' cc was 400 hp.

Not necessarily. It depends upon the year. I have rigged quite a few 23's with an original placard that said "Max HP=500. True, most got single 235's. Some got twins from t/115's, to t/235.
And I have owned two such rated hulls myself. 1st one a '77 23' SF, originally rigged with '78 T/235 Evinrudes. 2nd one a '78 23' Savage, rigged with twin Merc 225's. (Yes, the Savage with the Mercs was faster WOT than the Evinrudes by all of 2 mph). Here's the Savage specs:
http://www.classicseacraft.com/Savage23.htm

AND just for the record, the 1983 23' SeaVette with the transom cutout for twins was available placarded for 600 max OB hp.
We sold one at Waterway Marina in late 1983, and then sent across the street to Frank Brown's for rigging and motors. He rigged it with twin big-block 300 ELPT Mercury motors, that reportedly topped out at 77 mph after playing with motor height, props, and after installing nose cones. This VDH thing is for real!

[SnafuFishTeam]

Originally Posted by Fr. Frank

Not necessarily. It depends upon the year. I have rigged quite a few 23's with an original placard that said "Max HP=500. True, most got single 235's. Some got twins from t/115's, to t/235.
And I have owned two such rated hulls myself. 1st one a '77 23' SF, originally rigged with '78 T/235 Evinrudes. 2nd one a '78 23' Savage, rigged with twin Merc 225's. (Yes, the Savage with the Mercs was faster WOT than the Evinrudes by all of 2 mph). Here's the Savage specs:
[url]http://www.classic

Glad I have all the original documentation on the boat. Mine came with twin 115 Mercs. No doubt I have seen a number of these with twin 235 OMCs.

[SnafuFishTeam]

77' 23' cc

[SnafuFishTeam]

77 Savage

[SnafuFishTeam]

77' sceptre

[SnafuFishTeam]

78' price list

[kmoose]

The buddy I bought mine from had twin 250 OX 66 Yamahas on it before he sold it to me. He did completely rebuild the transom to handle it though.

[SnafuFishTeam]

Originally Posted by kmoose

The buddy I bought mine from had twin 250 OX 66 Yamahas on it before he sold it to me. He did completely rebuild the transom to handle it though.

That must have been awesome!

[captbone]

A single 200hp Yamaha 2.8 liter 4 cylinder is a fine engine for the 23ft Seacraft.

When this hull was introduced, the OMC 235hp 2.6 liter crossflow was the popular engine of choice. This was a crankshaft rated engine up until 1986. In 1987 this engine was reduced to 175hp prop shaft rating. The 235hp OMC was never much over 200hp on its best day.

Another forum member in Europe has a 115hp on his 23ft Seacraft and reports high 20 mphs.

In my opinion it all comes down to set up. I would rather have the new 150hp Mercury and spend a few days trying 10-15 different modern props (Enertia, Enertia ECO, Rev 4, and Mirage Plus) and engine height vs an F225 with an off the shelf M17 Yamaha prop mounted all the way down.

Set up makes a huge difference and very few people spend the time to dial a boat in. 25hp is not a lot with a poor set up. I would also argue that most boats are set up wrong (yes from the factory) right off the bat.

My proof is a 25ft Bertram Flybridge with bimini (10ft beam) that hit 41mph light with a single 225hp Optimax. I dialed it in and moved weight for the balance to get it right.


Just my 2 cents.