Merc 500's.....
 

Of all the different things to do to an engine to get more hp, what is the single best way to go? I only want to do one thing right now so what should it be for overall gains? Supercharger, Blower, Headers, etc. ???

Supercharger ! Best bang for the buck.

Boost Is Beeest!!!!! Replacement For Displacement!
:D

What are some of the pros and cons of chargers vs. blowers?

What is the average difference in hp gains between the two?

Supercharger and blower are the same thing. Maybe you're asking the difference between a centrifugal type supercharger and a Roots type supercharger.

So a Whipple charger is the same as a B&M blower?

Just a different name?

Yup!

Well damn it's true what they say...You learn something new everyday. :D

Thanks Mac

I wouldn't say they are the same thing. Same principle just a little different ways of going about it.

Ok....Can you explain?

More specific: A roots type (or screw type) has two interlocking screws that force the air charge into the engine and is mounted directly on top of the engine. A centrifugal type is mounted off to the side (like your alternator) and has a fan assembly inside that blows the air charge through some air ducting into the engine. Both types are driven by a belt off the crank.

Roots type:
Attachment 300720

Centrifugal type:
Attachment 300719

Whipple's are a bit different than a roots type. Here is some good info.
http://www.whipplesuperchargers.com/....asp?PageID=79

Nice....I guess now is where I ask how much should I expect to pay per motor to get a Whipple charger screaming?:D

About $8500 a motor + or - depending on your fuel system.....but it is hands down the best system and it will fit inside your hatch without mods most likely.

500's should already have headers or at least Gil exhaust?????

BTW, did you get a new boat????????

If you go with blowers, you better make sure the person who sets them up knows his chit or all you're gonna have is some 20k worth of anchors. Also, you better have a boat with hyd sterring and some good drives to handle the power.

There is a used Whipple on E-bay right now off of an hp500 carb engine. Just FYI.

I can tell you from experience (automobile:D) that the Whipple makes more boost at a lower RPM than a B&M!

What brand of aftermarket springs is a good bet to put on these motors? Also what is the size of tthe springs?

To answer your question Griff...no I din't get a new one yet...I am looking at a few different ones right now and I am trying to see what is the best one for the money.

I'll keep you posted....:ernaehrung004:

Get the best boat then worry about going faster after you get used to it. You better check into insurance in LA. It could be difficult to get from what I have read.

Whats a baja motor???

What brand of aftermarket springs is a good bet to put on these motors? Also what is the size of the springs?

Anyone....... I know a few guys had to do the swap on here.

Crane 929-16 for an HP500. That's what I swaped the stocker's out with.
Dave

Thanks Dave!!! This post had 370 views and nobody knew this info until now:readinghelp:....I thought I would never find out. I guess there aren't as many 500HP's out there like I thought....

Thanks Again bro,
Chuck

After reading several posts about the strain blowers/chargers put on an engine and the drives I have decided to stick with changing the internals for more HP. Any suggestions are welcome. I would like to see around 590-610HP at the prop with the Merc 500's.

Any ideas?????

I have one..........get a boat first, drive the boat, get used to the boat. Going from a 24 Outlaw to a boat with twin 500's is a big jump by itself.

Then worry about going faster after you know your budget.

My combo makes around 630 HP.

AFR 315 (Fully CNC'd) Heads
Crane Cam 168741
1.7 Ratio rockers on the exhaust
1.8 Ratio rockers on the intake
CMI Elbow tops
Crane Hi-6M ignition
1" HVH supersucker carb spacer
Harden Marine 10 quart Oil pans
Harden Marine 620-700 Oil coolers

Stock JE pistons, Rods, Stock Dart 6200 intake manifold, Stock Holley Carb and fuel system.

That should do it...Worked for me.

Dave

Hey Dave how you been buddy? I hope all is well in NY. That setup looks pretty close to what I am looking for without having to resort to the blowers. What is a ballpark figure I should expect on getting an engine up to that? I know it's not going to be cheap but in the long run I think I will be happier.
Thanks for the input.

Chuck