I was thinking the same thing Smitty, good method to run wet exhaust and recover the water.

..and it looks REALLY awesome on a cool morning with 8 mufflers blowing steam in the air..
.. (sorry, best vid I have of it... )

https://www.youtube.com/watch?v=frOinsWwKpw

What are the next steps in the quest for horsepower smitty ?

Cam change? Exhaust?

Next step is installing stock 500 efi intake then installing modded pieces one at a time. We have set the bar high though at 695 muffled hp so chances of the modded 500 intake coming remotely close to that are slim and none, nevertheless I have 30 hours and 2800$ in doing the 500 intakes between buying two of them, modding one, buying tb adapter, buying giant tb etc. Norm has to test a sb with stromberg 97s on it for stromberg in very near future, we are swamped with shop work so just finished gathering final pieces for new data aquisition on dyno, going to pull 540 off dyno, mod oil pan trap doors to see IF it can be made to work good enough to use in boat. Will post updates as they come, Smitty

Gotta love hearing a procharged bbc! Hears one of my pulls from years ago:
https://www.youtube.com/watch?v=y8nFoATJJOg

My buddy Joes 522, crappy edelbrock heads, with M4. That thing whined so loud just at idle your ears would hurt.

https://youtu.be/XJ1I_NtxVK0

That belt is crying uncle..

Had to be like a guitar string, or it would slip. He had nothijg but issues with that setup. He got fed up, and went to 1071 roots. The boat ran much better all around with the roots setup. (42 Fountain stagger)

Thats got a pretty big upper pulley on it too, to make the big numbers i did w my m3sc i had to turn it 60,000 rpms, 3.70 pulley, not much contact area for belt wrap, always an issue!

Mine made 9 lbs boost at 6000 rpm..
I run a 7.5" lower and a 5.25" upper pulley. 4.44 step up.(not self contained) 38,057 RPM impeller speed..
My MAX impeller speed is 48,000 so still have some room to grow ;)
Smitty, If I recall, you were just a bit past you max impeller speed.. :)

Haven't run it in the boat yet, but didn't notice any belt slip running on the dyno for two days... :)

I didn't want to say but when I saw that tensioner move that much I knew the life of the belt would not be long. Maybe in a small v-drive or a jet boat but not in offshore boat.

Totally agree. Plus, after a dyno pull, that head unit, you could cook an egg on it they got so hot.

If it wasnt a belt, it was the head unit of the blower blowing oil seals, fought carb issues the whole time when dealing with prosystems. Boat was a complete turd getting up on plane, lower rpms and stuff. Idled like crap, just sucked. I think we looked into cog setups, but forget why my buddy chose not to go with it, even considered a holley EFI setup from boostpower at the time.

Initially he had those carbs built from prosystems for the build. After getting them, and trying to dial them in , found out they were sucking the single needle and seat fuel bowls dry by the engine of the dyno runs. Upgraded to dual needle and seat bowls, that solved that issue. The carbs still sucked once in the boat.. Ended up switching to a pair of C&S aerosol blow thru's. Bolted them on, Mike Tkach and I talked with roger from C&S after a couple dyno pulls, and within no time and a few small adjustments to the power valve (C&S powervalve setup is way different than a typical holley), it had an EFI like fuel curve from 3000-6500rpm. The prosystems, no matter what we did, would just start out fat and end up way lean by the top end. The more boost we gave it, the worse the problem got. Seemed like that prosystems carb was good till about 10lbs of boost. Over that, it went haywire.

The boat ran mid teens with that setup, like on rails, and wasn't dialed in prop and drive height wise. But the low end still sucked. Better, but nothing like a roots or whipple. They made around the same TQ and HP as mike tkachs whippled 588ci on the dyno iirc, but on the water, they were a world apart. Mikes Fountain would pin you in your seat like a drag car with 4.56 rear when he nails it. Joes, was like it had 2.41 gears in it in comparison. He switched to the roots, lost some top speed, but says he loved the way the boat drove, idled, and did everything compared to the procharged setup. Was told his issues were from being blow thru carb. I could see that being true with the prosystems, as they would go pig rich getting on plane, etc. The C&S carbs, held a pretty good air fuel ratio at lower speeds, so Idk.

That being said, I have some friends who have ran low boost EFI prochargers on stock merc engines, and have had great luck with them. And of course articfriends ran his procharged setup making some good power for quite some time.

I know it's a joke that ProCharger even sells a procharger with an 8 rib drive that should go right the trash, blow through systems also leave something to be desired in a lot of applications. Randy fedo aka as CNC on here had nothing but problems w his pro system's carbs BUT later on came to find the way he introduced air into them in his home built innercooler boxes was causing his issues

I think my buddys M4 had the 12 rib belt? He had ran the hat from steve morris on his setup. I do remember there being a good amount of variance between banks, AFR wise. I believe it was due to the angle of the carb hat. I wanna say they told us to install a spacer under the hat, to help straighten out the air or something like that.

Saw Randys boat up in Traverse a couple years ago, that thing runs strong! I remember walking past it when tied to the dock, and noticed the size of his intercooler water feed lines, and was like "dam! he has some water going to those fukers!).

Randy fedo has m4 or m5 prochargers, his upper pulleys are quite large also and he has the plunger type tensioners. With his extra belt wrap hes never had belt issues. When i went to a 12 rib drive i had no belt issue's when i ran a 4" or bigger upper pulley, w 4" pulley i made 1000 hp, i never ran that pulley though in boat, i usually ran 3.85. I added re-inforcing ribs on head unit bracket to keep it from flexing which helped but everything had to be rubber band tight. With 3.70 pulley i made 1115 hp, was extremely difficult to keep belt from slipping but again blower was turning 60,000+ rpms. When i dynoed the procharger itself to see how much hp it took to turn it actually didnt take alot of hp to turn (i think it was under 75) , the belt issues came from having so little belt contact on pulley. A bigger head unit would have been the answer , fwiw, Smitty

Smitty we got the blow thru carb deal to work fine using a quickfuel, but we also ran a prosystems in a procharger box, worked fine but the box is a pain as you have to remove a dozen screws to do anything + remove the carb to remove float bowls..

Im sure your friend was running a 12 rib, the 8 rib is what comes w the m-1s and m-3s, the 12 rib is a option on m3s and i think std on everything above it, like i said, they dont hardly use any real hp to turn, it the fact that a 7.75 crank pulley is trying to turn a 3.70 blower pulley thats turning a blower 4.5-1 on top of that , i was experimenting w a extra idler last time my blower motor was sitting around here intact but between very few belt choices and limited space i never found a good spot to put it. I also thought about having randy fedo cnc me a lower pulley that was 8.25 then go to a bigger upper pulley but never got no where with that either plus again, 12 rib belts jump in giant increments so not a ton of options for neccesarily getting the right belt

Id put some low boost prochargers in my scarab (i still have 2 m3sc's and aw 504 innercoolers) but im getting too old to contort my body around in bilge, squeezing all that between backseat and engines would suck donkey balls, i will buy whipples first if it ever comes to that.

I just spit my coffee out...............thanks for that.........

IF i had a 38 AVS they would be a good bolt on having 3 feet between bulkhead and motors, this 15 or 18" though, no way. Everytime i wanted to do anything it would involve tearing all kids of stuff out, engines sit way lower in this boat than my baja. My son who works for me INFORMED me if i decided to put them in I'm on my own as he doesnt want to endure the pain either!

Sorry to hear about your first world struggles. I will gladly do you and your son a favor and take them off of your hands! I am just that good of a friend to consider doing this for you....haha!

Guy who bought my 272 wants us to install and tune one on it for him this spring, i have one scattered in parts but i bought ceramic bearings for it and need to put it back together

Hmmm I have space ... lots!!

And probably 1/2 the size of articfriends......he isn't the smallest of people. :)

I can totally see that. A buddy of mine has a 33 avs. I remember looking in his bilge one day at the docks, and immedietely thought " i do not want to work on that thing "

Awesome boats, but man , they are tight in the bilge. There was one out on west coast for sale, with #5 drives, that had to be really tight with trannys in there.

This one with the #5's

http://www.offshoreonly.com/classifi...vs-o68797.html

I redid my interior last year and converted my hatches to split double hatches with rams on sides, that got rid of that huge ram in middle, now i can squeezein front of motors if needed. Mounting innercoolers though in that area would use up all the real estate. Offshore excursion told me to put them under back seat but bulhead has about everything from boat mounted on it on aluminum diamond plate, would be quite the project, not even sure if i attempted it thay innercoolers would fit under back seat, not condidering it, my speed goal is only 95 to 100 mph, boat already runs 84/85 with stock power so no reason to boost it to 1000+ hp

Whipple port Injection intercoolers with your prochargers......Problem Solved!

I have been watching this thread a lot because I have been working on my low compression 500/540 efi

was a 540 short deck , 8.48 to 1 , 525 efi cams , dart 345 123cc heads , 500 efi intakes . guess of 550hp

now with a little work .

no with the same shortblock , 540 upped compression to 9.74 because of milling heads from 123 cc to 116 cc and gaskets from .53 to a .41 . cams swapped to a custom grind from comp , intakes from efi 500 to a single plane and a 4150 quick fuel 1050 cfm . dyno tested 710 hp now !

Kennyd, could you post the custom cam specs you used?

And jetting plz. Looking for a baseline as I upped my 565s from dish to flat top and now am at 9.4CR. Also went with better exhaust.

I will grab the card tonight , and post tomorrow

used 1050 cfm quick fuel 4150 style carbs , 82 jets front and 88 rear . 30degrees timing

Anyone heard from Smitty ?? sent him a couple txt with no answer

I txted you back, working 16 hours a day between my job and business, squeezing a couple hours in between that in prepping 1/3 of my house for demolition for my addition, ill call you today

its all good, neva got your text, no need to call

Cam specs , comp cams . 678 -680 lift . 251/262 @50 , on a114 separation

did you get my text last night,

What RPM did you have to turn for the 710hp ? thx

5900-6000