wayneh

I just built 2 496 stroker fresh water cooled marine engines we will be dynoing these in a few weeks just curious what you might think they will make for power and torque and @ what rpm?
This is the combo 4.310 bore 9.25 to 1 compression zero deck standard felpro blue head gasket SRP flat top 1 valve relief pistons file fit 1/16 1/16 3/16 standard tension oil ring, scat 6.385 4340 i beam rod, scat 9000 4.25 crank 781 heads 113 cc with 2.19 in 1.88 ex, hardened seats with little bit of bowl blend, unshrouded under the valve that was done with the valve job cutter. Camshaft is a bullet .223 in .231 ex .525 in .557 ex on a 112 cl installed @ 106.5 RPM air gap intakes with edelbrock 750 marine carb's with 5 degree wedge plates. Compcams roller tip rockers comp magnum pushrods internal zero balance. These are identical motors one is reverse rotation gonna try and dyno that one too. Lets see what you guys think thanks. BTW these are going in a sport fishing boat 34' lurs gonna have to reprop i know.

Wayne

mike tkach

iTrader: (3)

535 at 5400 rpm.that,s a pretty mild cam.

wayneh

yea i know it's a mild cam but this will see 3400 rpm's most of it's life and a heavy boat looking for torque not really horsepower. hoping for 475 hp and 575 tq plus or minus we'll see in a couple of weeks

GTOFFSHORE

Not to diss but those carbs are nothing but problems. So many people biotch about them falling apart in like 3 months if in salt so watch them.

f_inscreenname

Really? I've been using them for years/decades and never had a problem.

wayneh

thanks i'll watch them for coming apart. more concerned on how much power and torque right now Blue Print engines has a sim engine that makes 460 hp 515 tq hope to be little higher than that. a lot attention to detail went into these engine i built them like a race engine balanced decked line bored all clearances bore gauged with extra clearance piston to wall guides and wrist pins these are full floating forged pistons.

onesickpantera

iTrader: (1)

I'm FAR from an expert but I would say that is a good estimate.

mike tkach

iTrader: (3)

im confused,why would you put your carb in saltwater,not trying to be a smart azz,but i dont follow what u r saying,fuel&air in carb,on top of motor,how does salt water come into play?

FIXX

iTrader: (2)

im going to say 475 hp @ 5k and around 575 ft lbs tq @ 4k...should be a torque monster..

SFOcean

iTrader: (1)

The salt water boating environment is highly corrosive to everything. Take a close look at boats, houses and cars that live on or by the sea.