Land and Sea Dyno Results from the 80's

[Fr. Frank]

Somewhere on Scream n Fly is a Dyno test sheet that showed the 1973 Mercury XS1500 inline 6 cyl as producing 220 hp at 7500 rpm. I used to have one of those mounted on a 14'8" Cacci Craft (copy of the Checkmate V-Mate.) It would run low 80's, but was real squirrelly.
I blew it up.

[Bigshrimpin]

Frank - I love those 1500XS motors . . . very rare these days. Just Curious . . . How many old mercs on a 20CC do you think it would take to break fountains (self proclaimed Center Console world speed record)?

http://www.fountainpower.com/index.htm

[Fr. Frank]

With the record at 87 mph, I imagine a 20' SeaCraft with triple XS1500 motors turning 7500-7800 rpms could handily beat that. I know personally, that a 1983 20SF with a single Merc 225 on a jack plate, w/ nose cone and low-water intakes, a blueprinted hull, turniong a 14 X 32P over-hub chopper prop has hit 71 mph - with a 28 yr old female attorney at the helm.
Imagine the same boat with triple XS1500 motors producing a total of 660 hp with speedmaster or scimitar lower units.

I think 90+ mph is possible.

[Bigshrimpin]

I don't know where to get 1500xs, but I have two old V200's and a set of horizontal front halves in my garage.

[Fr. Frank]

The 1500XS 20" shaft was 275 lbs and the V200 20" shaft was 336 lbs. triples would be 825 lbs or 1008 lbs. And I know the V200 had a nasty tendency to self-destruct above 6500 rpm's.

Besides, you can easily fit triple XS motors on the transom of a 1973 20' Superfisherman. We had one with twin Merc 85 hp motors, and I commented at the time that you could fit 4 of them across if you wanted to. It would just submerge the transom. But not with a bracket

[Bigshrimpin]

Hmmm . . . sure would be a fun winter project. I love the idea of using 1500xs's I just have no idea where I'd find them. . . . I've seen lots of old freshwater Merc 1350's and 1500's for $300 - $1000