These are NOT a bolt on and go item !!!!!!!!! I do not care what they tell you at pro charger. it take a lot of time and money to get them set up right. they do work good when they are set up right. I run them with carbs so it is alot less work .With efi units i have herd more bad stories than good. Just a word to the wise . hate to see guys spend their money on stuff like this only to wish they had never seen it a year later. My advice would be do a LOT of research before you buy and not just sales ads. Just my .02 Jeff

Mine were at 8 psi with the bigger intercoolers.....his 6.2's had the smaller units (3-5psi?). Like posted above, they can work but tuning them takes someone with PROCHARGER experience. These things just seem finicky...and the fuel burn was terrible (maybe partly cause they run real rich).

I don't see the guy that had them on 6.2's very often in the winter but I'll try to find out more. We both bought the boats used so it's hard to say how things were done before we aquired them. I do know by the time he had run the boat a couple months he was changing the oil every 2-4 times out in the boat cause it had several quarts of gas in the oil.

I still find it fascinating that way back in 1999 I figured out that
none, I repeat none, of the supercharger kits are really a bolt
on and go proposition in the marine world. Unless you include
frequently repairing major damage as part of the plan.

I can rattle on endless firsthand stories (including procharged
6.2's) of excellent mechanical carnage (two words: eutectic pistons)

One lesson I learned: you either buy supercharged motors at the outset;
or take your existing engines to be totally rebuilt by a professional to
withstand the boost.

Ask Raylar, he's the pro that knows all about this on this
board.

Best of luck,

Pesky Varmint.

(P.S. 8 years and 450 hours on totally stock 575SCi's)

If your Mercury 6.2 engines are models that have cast pistons I would not advise supercharging them with any kind of real boost, lets say above 3 lbs!
The biggest problem you are going to encounter is reprogramming the PCM555 ECM's your 6.2 engines probably came equipped with. Pro-Charger offers absolutly no reprogramming assistance or support and the only person who can really help is Dustin at Whipple and he's not going to be excited about tuning ECM's for someone elses supercharging system, especially without a dyno or in the boat tuning to do the reprogramming properly.
Even if your engines have forged pistons or are redone with such, unless you can properly recalibrate the fuel and spark tables in the ECM's for positive boost your adventure with Pro Charger superchargers is most like going to be like a "Quickie with a Hooker" , it will get your rocks of initially but the long term success will be a real challange!
Save yourself the Drama, buy a complete properly tuned supercharger system from Whipple or build the motors up Naturally aspirated and save yourself the damages and heart ache later!!

Best Regards,
Ray @ Raylar

Been there, done that....
Amen Ray!

"eutectic pistons" can easily take the boost if set up properly. That said, you would need to go to carbs in order to ensure the proper richness and low timing advance. Forged rotating assemblies experience similar catastrophic damage from improper setup and boost.

BT

Thanks Pesky Varmit and Ray, you have definitely talked me out of a nightmare with the wrong gal! I appreciate your dedication and knowledge in engine building Ray and I am not interested in sabotaging these motors that run so well. I'll have to wait for those 10mph until I move up or am ready to purchase a couple of those 550 Raylar sbs you have been creating over there. Whipple is a class act but I had a line on the pro charges which made that project financially feasible. Again you guys, along with everyone else who chimed in, your exact knowledge is what I needed, not being an engine builder myself.

I did many hours of research on supercharging before the market tanked, and it boiled down to this: Whipple was the best solution for adding 100-150 HP to the 6.2's in my Formula 292, and I had figured it to be about $20-22k with installation, tuning, bigger props, etc. But, if you really crank up the boost you should expect to (eventually) grenade either your drives, engine bottom end, or both.

If I had the money right now and needed to see 80+MPH, I would sell\trade-in my 292 and buy a bigger boat with more horespower. If you've got money to burn and are in love with that hull, buy the Raylar SB 550 or build stroked SB Mercs AND XR or better drives that will withstand the torque of boost...and the launches you're gonna have to come down from

We typically run 6psi of boost intercooled with 91 octane or higher on the 6.2. We also recommending going to a 7 heat range NGK plug, we run the motor at 11:1 air fuel, and only run 24deg's total timing. This is what I consider conservative, but no matter what, the motor will not live without an oil cooler when supercharged. It simply can't maintain temp and pressure with that 4qt system. Anything less than 3psi is to me is just not worth it, just because the bang for the buck is just not there.

On another hand, the 350 Mag has higher compression so we send them out with 5psi, same air fuel, but only 22degs total timing.

There great little motors and we really never see issues with them, but like RHJS2006 said, you put too much boost too them, and they won't make it. Don't put an oil cooler on, and you'll toast it.

Other systems don't touch the computer, and this is just wrong, if you play with fuel psi, your screwing with the entire system. With stock injectors and higher pressure, your gonna be rich in vacuum. You can typically get WOT to be near perfect, until it sets a MAP HI code (takes about 150 failed samples for failure). This usually occurs in approx. 15 seconds of running in boost. Then it goes to failure mode and runs off of a calculation based off of TPS % and this gets by, but is not very accurate. It runs rich at idle and lean on top. Either way, it's not good. The older the motors, the better FMU style systems work, as the computers are not as advanced and the tolerances, fail-safes, etc. are not as accurate, therefore the FMU works pretty good. But some mfg's give you a fuel psi range of +/-10psi which is a drastic variance. This is ok if you have an accurate wide band 02, but if your dealing with reading plugs, good luck

Let me just say Whipple Charged - Thank You for taking the time to explain in depth about the 6.2s and how they operate when supercharged and how to properly set up the engine system with Whipples. I agree with rhsj2006, the best bet is to move up to more power or build the right power from the beginning. Thanks OSO!