^^^^^ Thanks for the Lone Wolf article.

25% slip at 77.3 mph?
(5450 rpm, 77,3 pmh, 30 pitch, 1,5:1 reduction)

BUP, no problem.

I agree that's alot of slip. Should run 80 easily under good conditions. I believe it was 3 persons and 40gal fuel test runs. Not good for max speed/slip numbers.

Thanks, good read!

Padraig

Keeper for sure. Wow! $125k. Glad there's a used market out there!

Thanks for posting the Powerboat article! I don't recall another Velocity making the cover of Power Boat magazine since I started subscribing in 1994. Nice to see it again 16 years later and makes me miss the annual PB offshore boat tests that were published ever Jan - Mar. Really looked forward to receiving those magazines in the mail during the dead of winter!

That writer is quite enthusiastic, but still a good read.

4-5footers ? Don't think so. LOL.
3.5-4psi engine compartment air psi .?Don't think so.LOL.

what?? Never would have thought??

Was this your boat day 1.

How is it running??

Running good! How has your summer been?

Padraig

It's been good . Poker run went good. Put on about 180 mi that weekend. Now just trying to get out as much as possible before it gets cooler

Could you remove the rev limiter via software, just for purposes of the test? That would be one way to post a bigger number, if the engine has the HP to push it.

Yes, the rev limiter can be raised if you can program the Merc PCM555. Whipple Superchargers and a few others can do this. No help revving a stock 496HO anywhere over 5150 rev limit. Power falls off big/fast after. Not to mention possible valve float as valvesprings are very weak.

do not even bother to go over 5100 with a stock 496 HO - there is nothing there on those stock apps. Stay off the rev limiter as well. Only a couple can raise the rev limiter on a recal for PCM 555 but after the first 500 HO 496s were made even the crank is not forged just to bring that up on top of. Not any forged internals in a 496.

basically for the recals on PCM 555 most that say they can really are sending them in to the very few that can. I am looking into recaling as we speak to do it myself as well.

Interesting. I wasn't suggesting raising the rev limiter for anyone, except as a possible explanation as to how they hit 75 @5400 with a stock 496 HO in the video.

So this chart showing forged crank and rods on the HO is incorrect?

Some early 2001-2002 496 HO's had the forged crankshaft until GM Powertrain - GM quit using them in lieu of GM's own new pressure rolled fillet nodular iron special 496 crank (bean counter decsion). Its nothing like an earlier GM cast iron crankshaft, much better part and nitirided too.
The forged units are a bit stronger and lighter than the cast crankshafts but both are very capable of handling 600-700HP without failures.

496 connecting rods, they are forged rods, early ones with pressed pins the later ones with full floating pins. These rods are metric length in stroke (6.683") and will not interchange with 454-502 sizes because they also have a metric diameter pin (actually measures about 1.043") which is larger than the standard BBC .990" size pin. The metric 10mm dia. rod bolts are not as strong as good ARP 7/16" rod bolts.

Mercruiser part numbers for all the fist engine serial number runs from day one. The mag and HO used the exact same crank part number. And in Volvo school we all went over this in 2002. I will try to find my class material and post a pic of that. Here is the Merc part numbers for HO and MAG Cranks both the same from day one - check it all out in the links below. Like I said maybe if even that 500 went out as forged cranks for the HO only but actually maybe 200 if I had to really guess really went out as forged cranks.

MerCruiser 496 Mag (H.O. Model) Block-crankshaft, Oil Pump, & Front Cover Parts

HO 496 link ^^^^^^^^^^^^^^^ for crank part number as shown in number 3

And the MAG crank numbers below link number 3 they are exactly the same from day one. Mag 375 hp vs HO 425. I would bet not many were forged cranks from GM period. Merc got these as long blocks and the same with Volvo - I will post my class material.

http://www.marineengine.com/parts/me...nd-front-cover

And here is the first and foremost the GM 496 that the race boats as well. This is GM first run brochures that came out way back for the intro of their HP3 496 that used MEFI 4 and cast cranks as well. Here is the proof in the GM 525 plus hp engines. Read the specs ---- CAST CRANK

Myself personally never seen a forged crank in a 496 ever but I have heard of TWO people swear that theirs was a forged crank. One was up here on OSO. https://cimg5.ibsrv.net/gimg/www.off...a78486d2f9.jpg

GM HP3 specs here from the brochure I have --- its the first ones out to the public many years ago.https://cimg4.ibsrv.net/gimg/www.off...0aa8948947.jpg

you guys are awesome!